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  • American Physical Society  (663.490)
  • Nature Publishing Group  (363.432)
  • Public Library of Science  (275.023)
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Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Journal cover
    Unbekannt
    Nature Publishing Group | JSTOR
    Online: 1(1).1845 –
    Print: 268.1993 – 303(5).2010 (Ort: A17, Kompaktmagazin, 64/5-6)
    Print: 270.1994 – 282.2000 (Ort: A17, Kompaktmagazin, 64/5-6)
    Verlag: Nature Publishing Group , JSTOR
    Print ISSN: 0036-8733
    Digitale ISSN: 1946-7087
    Thema: Biologie , Allgemeine Naturwissenschaft , Physik
    Abkürzung: Sci Am
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Journal cover
    Unbekannt
    Nature Publishing Group | Biocentury
    Online: 1.2008 – 7.2014
    Verlag: Nature Publishing Group , Biocentury
    Digitale ISSN: 1945-3477
    Thema: Allgemeine Naturwissenschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Journal cover
    Unbekannt
    Springer Nature | Nature Publishing Group | PubMed Central
    Online: 1.2011 –
    Verlag: Springer Nature , Nature Publishing Group , PubMed Central
    Digitale ISSN: 2045-2322
    Thema: Allgemeine Naturwissenschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.2001 – (older than 5 years)
    Verlag: Nature Publishing Group
    Print ISSN: 1470-269X
    Digitale ISSN: 1473-1150
    Thema: Chemie und Pharmazie
    Paralleltitel: The Pharmacogenomics Journal
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Unbekannt
    American Physical Society
    Online: 1(1).1964 – 4(1).1968
    Verlag: American Physical Society
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1(1).1970 –
    Verlag: Nature Publishing Group
    Print ISSN: 0032-3896
    Digitale ISSN: 1349-0540
    Thema: Chemie und Pharmazie , Maschinenbau
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.2010 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2041-4889
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Journal cover
    Unbekannt
    Nature Publishing Group | Cell Death Differentiation Association
    Online: 2015 –
    Verlag: Nature Publishing Group , Cell Death Differentiation Association
    Digitale ISSN: 2058-7716
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 4(1).1997 –
    Verlag: Nature Publishing Group
    Print ISSN: 1350-9047
    Digitale ISSN: 1476-5403
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Journal cover
    Unbekannt
    Nature Publishing Group | Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
    Online: 2015 –
    Verlag: Nature Publishing Group , Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences
    Digitale ISSN: 2056-5968
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 11
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.1998 –
    Verlag: Nature Publishing Group
    Print ISSN: 1018-4813
    Digitale ISSN: 1476-5438
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 12
    Journal cover
    Unbekannt
    Nature Publishing Group | PubMed Central
    Online: 1.1993 – (older than 12 months)
    Verlag: Nature Publishing Group , PubMed Central
    Print ISSN: 1018-4813
    Digitale ISSN: 1476-5438
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 4.1997 – (older than 5 years)
    Verlag: Nature Publishing Group
    Print ISSN: 0969-7128
    Digitale ISSN: 1476-5462
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 14
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.1999 – (older than 5 years)
    Verlag: Nature Publishing Group
    Print ISSN: 1466-4879
    Digitale ISSN: 1476-5470
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 15
    Journal cover
    Unbekannt
    Nanjing Agricultural University | Nature Publishing Group
    Online: 1.2014 –
    Verlag: Nanjing Agricultural University , Nature Publishing Group
    Print ISSN: 2662-6810
    Digitale ISSN: 2052-7276
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 16
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 22.1977 – (older than 5 years)
    Verlag: Nature Publishing Group
    Print ISSN: 1434-5161
    Digitale ISSN: 1435-232X
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 17
    Journal cover
    Unbekannt
    Nature Publishing Group | ISME (International Society for Microbial Ecology)
    Online: 1.2007 –
    Verlag: Nature Publishing Group , ISME (International Society for Microbial Ecology)
    Körperschaft: International Society for Microbial Ecology, ISME
    Print ISSN: 1751-7362
    Digitale ISSN: 1751-7370
    Thema: Biologie
    Schlagwort(e): Mikrobiologie
    Paralleltitel: The ISME Journal
    Standort Signatur Erwartet Verfügbarkeit
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  • 18
    Journal cover
    Unbekannt
    American Physical Society
    Online: 1.2017 –
    Verlag: American Physical Society
    Digitale ISSN: 2475-9953
    Thema: Maschinenbau , Physik
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 19
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.2001 –
    Verlag: Nature Publishing Group
    Print ISSN: 1470-269X
    Digitale ISSN: 1473-1150
    Thema: Chemie und Pharmazie
    Standort Signatur Erwartet Verfügbarkeit
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  • 20
    Journal cover
    Unbekannt
    American Physical Society
    Online: 1(1).2019 –
    Verlag: American Physical Society
    Digitale ISSN: 2643-1564
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 21
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    Unbekannt
    American Physical Society
    Online: 1993 –
    Verlag: American Physical Society
    Print ISSN: 0003-0503
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 22
    Journal cover
    Unbekannt
    Shanghai Institute of Cell Biology | Nature Publishing Group
    Online: 1.1990 – (older than 12 months)
    Verlag: Shanghai Institute of Cell Biology , Nature Publishing Group
    Print ISSN: 1001-0602
    Digitale ISSN: 1748-7838
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 23
    Journal cover
    Unbekannt
    Shanghai Institute of Cell Biology | Nature Publishing Group
    Online: 1(1).1990 –
    Verlag: Shanghai Institute of Cell Biology , Nature Publishing Group
    Print ISSN: 1001-0602
    Digitale ISSN: 1748-7838
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 24
    Journal cover
    Unbekannt
    American Physical Society
    Online: 1.1998 –
    Vormals: Physical Review Focus  (1998–2011)
    Verlag: American Physical Society
    Digitale ISSN: 1943-2879
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 25
    Journal cover
    Unbekannt
    American Physical Society
    Online: 4(5).1995 –
    Verlag: American Physical Society
    Print ISSN: 1058-8132
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 26
    Journal cover
    Unbekannt
    Shanghai Institute of Materia Medica, Chinese Academy of Sciences | Nature Publishing Group
    Online: 1.1980 – (older than 12 months)
    Verlag: Shanghai Institute of Materia Medica, Chinese Academy of Sciences , Nature Publishing Group
    Print ISSN: 1671-4083
    Digitale ISSN: 0253-9756
    Thema: Chemie und Pharmazie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 27
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 22(1).1977 –
    Verlag: Nature Publishing Group
    Print ISSN: 1434-5161
    Digitale ISSN: 1435-232X
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 28
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    Unbekannt
    American Physical Society
    Online: 1995 –
    Verlag: American Physical Society
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 29
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    Nature Publishing Group
    Online: 2007 – 2009
    Verlag: Nature Publishing Group
    Digitale ISSN: 1754-8705
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 30
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    Unbekannt
    Nature Publishing Group
    Online: 1.2007 – 4(5).2010
    Verlag: Nature Publishing Group
    Digitale ISSN: 1753-9315
    Thema: Geologie und Paläontologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 31
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    Nature Publishing Group
    Online: 1998 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 1744-7933
    Thema: Allgemeine Naturwissenschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 32
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.2015 –
    Verlag: Nature Publishing Group
    Print ISSN: 2055-026X
    Digitale ISSN: 2055-0278
    Thema: Biologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 33
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    Unbekannt
    Nature Publishing Group
    Online: 16(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1754-2189
    Digitale ISSN: 1750-2799
    Thema: Allgemeine Naturwissenschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 34
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 19(1).2021 –
    Online: 19(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1740-1526
    Digitale ISSN: 1740-1534
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 35
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    Unbekannt
    Nature Publishing Group
    Online: 22(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1471-0072
    Digitale ISSN: 1471-0080
    Thema: Biologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 36
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    Unbekannt
    Nature Publishing Group
    Online: 17(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1552-4450
    Digitale ISSN: 1552-4469
    Thema: Biologie , Chemie und Pharmazie
    Standort Signatur Erwartet Verfügbarkeit
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  • 37
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1(1).2009 – 1(9).2009
    Online: 13(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1755-4330
    Digitale ISSN: 1755-4349
    Thema: Chemie und Pharmazie
    Standort Signatur Erwartet Verfügbarkeit
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  • 38
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    Nature Publishing Group
    Online: 229.1971 – 246.1973
    Verlag: Nature Publishing Group
    Print ISSN: 0300-8746
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 39
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    Nature Publishing Group
    Online: 2006 – 2012
    Verlag: Nature Publishing Group
    Digitale ISSN: 1756-0357
    Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 40
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.1983 – 27.2009
    Online: 39(1).2021 –
    Vormals: Bio-Technology  (1983–1996)
    Verlag: Nature Publishing Group
    Print ISSN: 0733-222X , 1087-0156
    Digitale ISSN: 1546-1696
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Standort Signatur Erwartet Verfügbarkeit
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  • 41
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1.1999 – 11.2009
    Online: 23(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1465-7392
    Digitale ISSN: 1476-4679
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 42
    Journal cover
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    Nature Publishing Group
    Online: 22(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1529-2908
    Digitale ISSN: 1529-2916
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 43
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    Nature Publishing Group
    Online: 24(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1097-6256
    Digitale ISSN: 1546-1726
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 44
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    Nature Publishing Group
    Online: 1.1994 – 16.2009
    Online: 28(1).2021 –
    Vormals: Nature Structural Biology  (1994–2003)
    Verlag: Nature Publishing Group
    Print ISSN: 1072-8368 , 1545-9993
    Digitale ISSN: 1545-9985
    Thema: Biologie , Medizin
    Akronym/Kurzwort: NSMB
    Abkürzung: Nat Struct Mol Biol
    Standort Signatur Erwartet Verfügbarkeit
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  • 45
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    Nature Publishing Group
    Online: 2015 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2055-5008
    Thema: Biologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 46
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 1(1).2010 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2041-1723
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 47
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 16(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1748-3387
    Digitale ISSN: 1748-3395
    Thema: Biologie , Chemie und Pharmazie , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 48
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 18(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1548-7091
    Digitale ISSN: 1548-7105
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 49
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 229(1).1971 – 246(155).1973
    Verlag: Nature Publishing Group
    Print ISSN: 0090-0028 , 0369-4887
    Thema: Biologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 50
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 22(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1471-0056
    Digitale ISSN: 1471-0064
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 51
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 6(1).2021 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2058-8437
    Thema: Maschinenbau
    Standort Signatur Erwartet Verfügbarkeit
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  • 52
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 22(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1471-003X
    Digitale ISSN: 1471-0048
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 53
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 2015 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2056-7189
    Thema: Biologie
    Standort Signatur Erwartet Verfügbarkeit
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  • 54
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 2015 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2373-8065
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 55
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 2015 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2056-6387
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 56
    Journal cover
    Unbekannt
    Nature Publishing Group
    Online: 2(1).2021 –
    Verlag: Nature Publishing Group
    Digitale ISSN: 2662-1355
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Standort Signatur Erwartet Verfügbarkeit
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  • 57
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    Nature Publishing Group
    Online: 1.1992 – 41.2009
    Online: 53(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1061-4036
    Digitale ISSN: 1546-1718
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 58
    Journal cover
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    Nature Publishing Group
    Online: 27(1).2021 –
    Verlag: Nature Publishing Group
    Print ISSN: 1078-8956
    Digitale ISSN: 1546-170X
    Thema: Biologie , Medizin
    Standort Signatur Erwartet Verfügbarkeit
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  • 59
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    Nature Publishing Group | Tokyo Institute of Technology
    Online: 1(1).2009 –
    Verlag: Nature Publishing Group , Tokyo Institute of Technology
    Print ISSN: 1884-4049
    Digitale ISSN: 1884-4057
    Thema: Maschinenbau
    Standort Signatur Erwartet Verfügbarkeit
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  • 60
    Journal cover
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    Nature Publishing Group | Shanghai Institute of Ceramics of the Chinese Academy of Sciences
    Online: 2015 –
    Verlag: Nature Publishing Group , Shanghai Institute of Ceramics of the Chinese Academy of Sciences
    Digitale ISSN: 2057-3960
    Thema: Informatik , Maschinenbau
    Standort Signatur Erwartet Verfügbarkeit
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  • 61
    Journal cover
    Unbekannt
    Nature Publishing Group | ISME (International Society for Microbial Ecology), PubMed Central
    Online: 1.2007 – (older than 12 months)
    Verlag: Nature Publishing Group , ISME (International Society for Microbial Ecology), PubMed Central
    Körperschaft: International Society for Microbial Ecology, ISME
    Print ISSN: 1751-7362
    Digitale ISSN: 1751-7370
    Thema: Biologie
    Schlagwort(e): Mikrobiologie
    Paralleltitel: The ISME Journal
    Standort Signatur Erwartet Verfügbarkeit
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  • 62
    Journal cover
    Unbekannt
    Nature Publishing Group | ChangChun Institute of Optics, Fine Mechanics, and Physics (CIOMP)
    Online: 1.2012 –
    Verlag: Nature Publishing Group , ChangChun Institute of Optics, Fine Mechanics, and Physics (CIOMP)
    Digitale ISSN: 2047-7538
    Thema: Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 63
    Publikationsdatum: 2020-10-16
    Beschreibung: We propose a version of the pure temporal epidemic type aftershock sequences (ETAS) model: the ETAS model with correlated magnitudes. As for the standard case, we assume the Gutenberg-Richter law to be the probability density for the magnitudes of the background events. Instead, the magnitude of the triggered shocks is assumed to be probabilistically dependent on that of the relative mother events. This probabilistic dependence is motivated by some recent works in the literature and by the results of a statistical analysis made on some seismic catalogs [Spassiani and Sebastiani, J. Geophys. Res. 121, 903 (2016)10.1002/2015JB012398]. On the basis of the experimental evidences obtained in the latter paper for the real catalogs, we theoretically derive the probability density function for the magnitudes of the triggered shocks proposed in Spassiani and Sebastiani and there used for the analysis of two simulated catalogs. To this aim, we impose a fundamental condition: averaging over all the magnitudes of the mother events, we must obtain again the Gutenberg-Richter law. This ensures the validity of this law at any event's generation when ignoring past seismicity. The ETAS model with correlated magnitudes is then theoretically analyzed here. In particular, we use the tool of the probability generating function and the Palm theory, in order to derive an approximation of the probability of zero events in a small time interval and to interpret the results in terms of the interevent time between consecutive shocks, the latter being a very useful random variable in the assessment of seismic hazard.
    Beschreibung: Published
    Beschreibung: 042134
    Beschreibung: 6T. Studi di pericolosità sismica e da maremoto
    Beschreibung: JCR Journal
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 64
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    Nature Publishing Group
    In:  EPIC3Nature Geoscience, Nature Publishing Group, 7(5), pp. 376-381, ISSN: 1752-0894
    Publikationsdatum: 2014-07-14
    Beschreibung: During the Middle Miocene climate transition about 14 million years ago, the Antarctic ice sheet expanded to near-modern volume. Surprisingly, this ice sheet growth was accompanied by a warming in the surface waters of the Southern Ocean, whereas a slight deep-water temperature increase was delayed by more than 200 thousand years. Here we use a coupled atmosphere–ocean model to assess the relative effects of changes in atmospheric CO2 concentration and ice sheet growth on regional and global temperatures. In the simulations, changes in the wind field associated with the growth of the ice sheet induce changes in ocean circulation, deep-water formation and sea-ice cover that result in sea surface warming and deep-water cooling in large swaths of the Atlantic and Indian ocean sectors of the Southern Ocean. We interpret these changes as the dominant ocean surface response to a 100-thousand-year phase of massive ice growth in Antarctica. A rise in global annual mean temperatures is also seen in response to increased Antarctic ice surface elevation. In contrast, the longer-term surface and deep-water temperature trends are dominated by changes in atmospheric CO2 concentration. We therefore conclude that the climatic and oceanographic impacts of the Miocene expansion of the Antarctic ice sheet are governed by a complex interplay between wind field, ocean circulation and the sea-ice system.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 65
    Publikationsdatum: 2014-07-17
    Beschreibung: Thermokarst lakes formed across vast regions of Siberia and Alaska during the last deglaciation and are thought to be a net source of atmospheric methane and carbon dioxide during the Holocene epoch1, 2, 3, 4. However, the same thermokarst lakes can also sequester carbon5, and it remains uncertain whether carbon uptake by thermokarst lakes can offset their greenhouse gas emissions. Here we use field observations of Siberian permafrost exposures, radiocarbon dating and spatial analyses to quantify Holocene carbon stocks and fluxes in lake sediments overlying thawed Pleistocene-aged permafrost. We find that carbon accumulation in deep thermokarst-lake sediments since the last deglaciation is about 1.6 times larger than the mass of Pleistocene-aged permafrost carbon released as greenhouse gases when the lakes first formed. Although methane and carbon dioxide emissions following thaw lead to immediate radiative warming, carbon uptake in peat-rich sediments occurs over millennial timescales. We assess thermokarst-lake carbon feedbacks to climate with an atmospheric perturbation model and find that thermokarst basins switched from a net radiative warming to a net cooling climate effect about 5,000 years ago. High rates of Holocene carbon accumulation in 20 lake sediments (47 ± 10 grams of carbon per square metre per year; mean ± standard error) were driven by thermokarst erosion and deposition of terrestrial organic matter, by nutrient release from thawing permafrost that stimulated lake productivity and by slow decomposition in cold, anoxic lake bottoms. When lakes eventually drained, permafrost formation rapidly sequestered sediment carbon. Our estimate of about 160 petagrams of Holocene organic carbon in deep lake basins of Siberia and Alaska increases the circumpolar peat carbon pool estimate for permafrost regions by over 50 per cent (ref. 6). The carbon in perennially frozen drained lake sediments may become vulnerable to mineralization as permafrost disappears7, 8, 9, potentially negating the climate stabilization provided by thermokarst lakes during the late Holocene.
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  • 66
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    Unbekannt
    Nature Publishing Group
    In:  EPIC3Nature, Nature Publishing Group, 512(7514), pp. 290-294, ISSN: 0028-0836
    Publikationsdatum: 2014-09-04
    Beschreibung: During glacial periods of the Late Pleistocene, an abundance of proxy data demonstrates the existence of large and repeated millennial-scale warming episodes, known as Dansgaard–Oeschger (DO) events1. This ubiquitous feature of rapid glacial climate change can be extended back as far as 800,000 years before present (BP) in the ice core record2, and has drawn broad attention within the science and policy-making communities alike3. Many studies have been dedicated to investigating the underlying causes of these changes, but no coherent mechanism has yet been identified3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. Here we show, by using a comprehensive fully coupled model16, that gradual changes in the height of the Northern Hemisphere ice sheets (NHISs) can alter the coupled atmosphere–ocean system and cause rapid glacial climate shifts closely resembling DO events. The simulated global climate responses—including abrupt warming in the North Atlantic, a northward shift of the tropical rainbelts, and Southern Hemisphere cooling related to the bipolar seesaw—are generally consistent with empirical evidence1, 3, 17. As a result of the coexistence of two glacial ocean circulation states at intermediate heights of the ice sheets, minor changes in the height of the NHISs and the amount of atmospheric CO2 can trigger the rapid climate transitions via a local positive atmosphere–ocean–sea-ice feedback in the North Atlantic. Our results, although based on a single model, thus provide a coherent concept for understanding the recorded millennial-scale variability and abrupt climate changes in the coupled atmosphere–ocean system, as well as their linkages to the volume of the intermediate ice sheets during glacials.
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  • 67
    Publikationsdatum: 2019-03-08
    Beschreibung: Coccolithophores have influenced the global climate for over 200 million years1. These marine phytoplankton can account for 20 per cent of total carbon fixation in some systems2. They form blooms that can occupy hundreds of thousands of square kilometres and are distinguished by their elegantly sculpted calcium carbonate exoskeletons (coccoliths), rendering themvisible fromspace3.Although coccolithophores export carbon in the form of organic matter and calcite to the sea floor, they also release CO2 in the calcification process. Hence, they have a complex influence on the carbon cycle, driving either CO2 production or uptake, sequestration and export to the deep ocean4. Here we report the first haptophyte reference genome, from the coccolithophore Emiliania huxleyi strain CCMP1516, and sequences from 13 additional isolates. Our analyses reveal a pan genome (core genes plus genes distributed variably between strains) probably supported by an atypical complement of repetitive sequence in the genome. Comparisons across strains demonstrate thatE. huxleyi, which has long been considered a single species, harbours extensive genome variability reflected in different metabolic repertoires. Genome variability within this species complex seems to underpin its capacity both to thrive in habitats ranging from the equator to the subarctic and to form large-scale episodic blooms under a wide variety of environmental conditions.
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  • 68
    Publikationsdatum: 2016-11-24
    Beschreibung: Carbon capture and storage is promoted as a mitigation method counteracting the increase of atmospheric CO2 levels. However, at this stage, environmental consequences of potential CO2 leakage from sub-seabed storage sites are still largely unknown. In a 3-month-long mesocosm experiment, this study assessed the impact of elevated pCO2 levels (1,500 to 24,400 µatm) on Cerastoderma edule dominated benthic communities from the Baltic Sea. Mortality of C. edule was significantly increased in the highest treatment (24,400 µatm) and exceeded 50%. Furthermore, mortality of small size classes (0-1 cm) was significantly increased in treatment levels ≥6,600 µatm. First signs of external shell dissolution became visible at ≥1,500 µatm, holes were observed at 〉6,600 µatm. C. edule body condition decreased significantly at all treatment levels (1,500-24,400 µatm). Dominant meiofauna taxa remained unaffected in abundance. Densities of calcifying meiofauna taxa (i.e. Gastropoda and Ostracoda) decreased in high CO2 treatments (〉6,600 µatm), while the non - calcifying Gastrotricha significantly increased in abundance at 24,400 µatm. In addition, microbial community composition was altered at the highest pCO2 level. We conclude that strong CO2 leakage can alter benthic infauna community composition at multiple trophic levels, likely due to high mortality of the dominant macrofauna species C. edule.
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  • 69
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    Unbekannt
    Nature Publishing Group
    In:  EPIC3Scientific Reports, Nature Publishing Group, 7(5828)
    Publikationsdatum: 2017-10-10
    Beschreibung: Arctic permafrost caps vast amounts of old, geologic methane (CH4) in subsurface reservoirs. Thawing permafrost opens pathways for this CH4 to migrate to the surface. However, the occurrence of geologic emissions and their contribution to the CH4 budget in addition to recent, biogenic CH4 is uncertain. Here we present a high-resolution (100 m × 100 m) regional (10,000 km²) CH4 flux map of the Mackenzie Delta, Canada, based on airborne CH4 flux data from July 2012 and 2013. We identify strong, likely geologic emissions solely where the permafrost is discontinuous. These peaks are 13 times larger than typical biogenic emissions. Whereas microbial CH4 production largely depends on recent air and soil temperature, geologic CH4 was produced over millions of years and can be released year-round provided open pathways exist. Therefore, even though they only occur on about 1% of the area, geologic hotspots contribute 17% to the annual CH4 emission estimate of our study area. We suggest that this share may increase if ongoing permafrost thaw opens new pathways. We conclude that, due to permafrost thaw, hydrocarbon-rich areas, prevalent in the Arctic, may see increased emission of geologic CH4 in the future, in addition to enhanced microbial CH4 production.
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  • 70
    Publikationsdatum: 2018-09-20
    Beschreibung: Understanding how the Antarctic ice sheet will respond to global warming relies on knowledge of how it has behaved in the past. The use of numerical models, the only means to quantitatively predict the future, is hindered by limitations to topographic data both now and in the past, and in knowledge of how subsurface oceanic, glaciological and hydrological processes interact. Incorporating the variety and interplay of such processes, operating at multiple spatio-temporal scales, is critical to modeling the Antarctic’s system evolution and requires direct observations in challenging locations. As these processes do not observe disciplinary boundaries neither should our future research.
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  • 71
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    Unbekannt
    Nature Publishing Group
    In:  EPIC3Nature Communication, Nature Publishing Group, 9(3178), ISSN: 2041-1723
    Publikationsdatum: 2019-02-13
    Beschreibung: Natural dissolved organic matter (DOM) comprises a broad range of dissolved organic molecules in aquatic systems and is among the most complex molecular mixtures known. Here we show, by comparing detailed structural fingerprints of individual molecular formulae in DOM from a set of four marine and one freshwater environments, that a major component of DOM is molecularly indistinguishable in these diverse samples. Molecular conformity was not only apparent by the co-occurrence of thousands of identical molecular formulae, but also by identical structural features of those isomers that collectively represent a molecular formula. The presence of a large pool of compounds with identical structural features in DOM is likely the result of a cascade of degradation processes or common synthetic pathways that ultimately lead to the formation of a universal background, regardless of origin and history of the organic material. This novel insight impacts our understanding of long-term turnover of DOM as the underlying mechanisms are possibly universal.
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  • 72
    Publikationsdatum: 2021-01-12
    Beschreibung: Permafrost warming has the potential to amplify global climate change, because when frozen sediments thaw it unlocks soil organic carbon. Yet to date, no globally consistent assessment of permafrost temperature change has been compiled. Here we use a global data set of permafrost temperature time series from the Global Terrestrial Network for Permafrost to evaluate temperature change across permafrost regions for the period since the International Polar Year (2007–2009). During the reference decade between 2007 and 2016, ground temperature near the depth of zero annual amplitude in the continuous permafrost zone increased by 0.39 ± 0.15 °C. Over the same period, discontinuous permafrost warmed by 0.20 ± 0.10 °C. Permafrost in mountains warmed by 0.19 ± 0.05 °C and in Antarctica by 0.37 ± 0.10 °C. Globally, permafrost temperature increased by 0.29 ± 0.12 °C. The observed trend follows the Arctic amplification of air temperature increase in the Northern Hemisphere. In the discontinuous zone, however, ground warming occurred due to increased snow thickness while air temperature remained statistically unchanged.
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  • 73
    facet.materialart.
    Unbekannt
    Nature Publishing Group
    In:  EPIC3Scientific Reports, Nature Publishing Group, 7(2542), ISSN: 2045-2322
    Publikationsdatum: 2019-03-07
    Beschreibung: Sponges (Porifera) are abundant and diverse members of benthic filter feeding communities in most marine ecosystems, from the deep sea to tropical reefs. A characteristic feature is the associated dense and diverse prokaryotic community present within the sponge mesohyl. Previous molecular genetic studies revealed the importance of host identity for the community composition of the sponge-associated microbiota. However, little is known whether sponge host-specific prokaryotic community patterns observed at 97% 16S rRNA gene sequence similarity are consistent at high taxonomic ranks (from genus to phylum level). In the present study, we investigated the prokaryotic community structure and variation of 24 sponge specimens (seven taxa) and three seawater samples from Sweden. Results show that the resemblance of prokaryotic communities at different taxonomic ranks is consistent with patterns present at 97% operational taxonomic unit level.
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  • 74
    facet.materialart.
    Unbekannt
    Nature Publishing Group
    In:  EPIC3Scientific Reports, Nature Publishing Group, 9(7962), ISSN: 2045-2322
    Publikationsdatum: 2019-06-11
    Beschreibung: Arctic warming was more pronounced than warming in midlatitudes in the last decades making this region a hotspot of climate change. Associated with this, a rapid decline of sea-ice extent and a decrease of its thickness has been observed. Sea-ice retreat allows for an increased transport of heat and momentum from the ocean up to the tropo- and stratosphere by enhanced upward propagation of planetary-scale atmospheric waves. In the upper atmosphere, these waves deposit the momentum transported, disturbing the stratospheric polar vortex, which can lead to a breakdown of this circulation with the potential to also significantly impact the troposphere in mid- to late-winter and early spring. Therefore, an accurate representation of stratospheric processes in climate models is necessary to improve the understanding of the impact of retreating sea ice on the atmospheric circulation. By modeling the atmospheric response to a prescribed decline in Arctic sea ice, we show that including interactive stratospheric ozone chemistry in atmospheric model calculations leads to an improvement in tropo-stratospheric interactions compared to simulations without interactive chemistry. This suggests that stratospheric ozone chemistry is important for the understanding of sea ice related impacts on atmospheric dynamics.
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  • 75
    Publikationsdatum: 2019-07-15
    Beschreibung: The oxygen isotope composition of speleothems is a widely used proxy for past climate change. Robust use of this proxy depends on understanding the relationship between precipitation and cave drip water δ18O. Here, we present the first global analysis, based on data from 163 drip sites, from 39 caves on five continents, showing that drip water δ18O is most similar to the amount-weighted precipitation δ18O where mean annual temperature (MAT) is 〈 10 °C. By contrast, for seasonal climates with MAT 〉 10 °C and 〈 16 °C, drip water δ18O records the recharge-weighted δ18O. This implies that the δ18O of speleothems (formed in near isotopic equilibrium) are most likely to directly reflect meteoric precipitation in cool climates only. In warmer and drier environments, speleothems will have a seasonal bias toward the precipitation δ18O of recharge periods and, in some cases, the extent of evaporative fractionation of stored karst water.
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  • 76
    Publikationsdatum: 2020-04-14
    Beschreibung: The Asian monsoon (AM) played an important role in the dynastic history of China, yet it remains unknown whether AM-mediated shifts in Chinese societies affect earth surface processes to the point of exceeding natural variability. Here, we present a dust storm intensity record dating back to the first unified dynasty of China (the Qin Dynasty, 221–207 B.C.E.). Marked increases in dust storm activity coincided with unified dynasties with large populations during strong AM periods. By contrast, reduced dust storm activity corresponded to decreased population sizes and periods of civil unrest, which was co-eval with a weakened AM. The strengthened AM may have facilitated the development of Chinese civilizations, destabilizing the topsoil and thereby increasing the dust storm frequency. Beginning at least 2000 years ago, human activities might have started to overtake natural climatic variability as the dominant controls of dust storm activity in eastern China.
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  • 77
    Publikationsdatum: 2020-11-12
    Beschreibung: Antarctic krill, Euphausia superba, supports a valuable commercial fishery in the Southwest Atlantic, which holds the highest krill densities and is warming rapidly. The krill catch is increasing, is concentrated in a small area, and has shifted seasonally from summer to autumn/winter. The fishery is managed by the Commission for the Conservation of Antarctic Marine Living Resources, with the main goal of safeguarding the large populations of krill-dependent predators. Here we show that, because of the restricted distribution of successfully spawning krill and high inter-annual variability in their biomass, the risk of direct fishery impacts on the krill stock itself might be higher than previously thought. We show how management benefits could be achieved by incorporating uncertainty surrounding key aspects of krill ecology into management decisions, and how knowledge can be improved in these key areas. This improved information may be supplied, in part, by the fishery itself.
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  • 78
    Publikationsdatum: 2021-02-03
    Beschreibung: The dominant feature of large-scale mass transfer in the modern ocean is the Atlantic meridional overturning circulation (AMOC). The geometry and vigour of this circulation influences global climate on various timescales. Palaeoceanographic evidence suggests that during glacial periods of the past 1.5 million years the AMOC had markedly different features from today; in the Atlantic basin, deep waters of Southern Ocean origin increased in volume while above them the core of the North Atlantic Deep Water (NADW) shoaled. An absence of evidence on the origin of this phenomenon means that the sequence of events leading to global glacial conditions remains unclear. Here we present multi-proxy evidence showing that northward shifts in Antarctic iceberg melt in the Indian–Atlantic Southern Ocean (0–50°E) systematically preceded deep-water mass reorganizations by one to two thousand years during Pleistocene-era glaciations. With the aid of iceberg-trajectory model experiments, we demonstrate that such a shift in iceberg trajectories during glacial periods can result in a considerable redistribution of freshwater in the Southern Ocean. We suggest that this, in concert with increased sea-ice cover, enabled positive buoyancy anomalies to ‘escape’ into the upper limb of the AMOC, providing a teleconnection between surface Southern Ocean conditions and the formation of NADW. The magnitude and pacing of this mechanism evolved substantially across the mid-Pleistocene transition, and the coeval increase in magnitude of the ‘southern escape’ and deep circulation perturbations implicate this mechanism as a key feedback in the transition to the ‘100-kyr world’, in which glacial–interglacial cycles occur at roughly 100,000-year periods.
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  • 79
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    Unbekannt
    Nature Publishing Group
    In:  EPIC3Nature Protocols, Nature Publishing Group, 13(6), pp. 1310-1330, ISSN: 1754-2189
    Publikationsdatum: 2020-02-23
    Beschreibung: Traditionally, the description of microorganisms starts with their isolation from an environmental sample. Many environmentally relevant anaerobic microorganisms grow very slowly, and often they rely on syntrophic interactions with other microorganisms. This impedes their isolation and characterization by classic microbiological techniques. We developed and applied an approach for the successive enrichment of syntrophic hydrocarbon-degrading microorganisms from environmental samples. We collected samples from microbial mat-covered hydrothermally heated hydrocarbon-rich sediments of the Guaymas Basin and mixed them with synthetic mineral medium to obtain sediment slurries. Supplementation with defined substrates (i.e., methane or butane), incubation at specific temperatures, and a regular maintenance procedure that included the measurement of metabolic products and stepwise dilutions enabled us to establish highly active, virtually sediment-free enrichment cultures of actively hydrocarbon-degrading communities in a 6-months to several-years' effort. Using methane as sole electron donor shifted the originally highly diverse microbial communities toward defined mixed cultures dominated by syntrophic consortia consisting of anaerobic methane-oxidizing archaea (ANME) and different sulfate-reducing bacteria. Cultivation with butane at 50 °C yielded consortia of archaea belonging to Candidatus Syntrophoarchaeum and Candidatus Desulfofervidus auxilii partner bacteria. This protocol also describes sampling for further molecular characterization of enrichment cultures by fluorescence in situ hybridization (FISH), and transcriptomics and metabolite analyses, which can provide insights into the functioning of hydrocarbon metabolism in archaea and resolve important mechanisms that enable electron transfer to their sulfate-reducing partner bacteria.
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  • 80
    Publikationsdatum: 2020-02-12
    Beschreibung: Background The proportion of conserved DNA sequences with no clear function is steadily growing in bioinformatics databases. Studies of sequence and structural homology have indicated that many uncharacterized protein domain sequences are variants of functionally described domains. If these variants promote an organism's ecological fitness, they are likely to be conserved in the genome of its progeny and the population at large. The genetic composition of microbial communities in their native ecosystems is accessible through metagenomics. We hypothesize the co-variation of protein domain sequences across metagenomes from similar ecosystems will provide insights into their potential roles and aid further investigation. Methodology/Principal findings We calculated the correlation of Pfam protein domain sequences across the Global Ocean Sampling metagenome collection, employing conservative detection and correlation thresholds to limit results to well-supported hits and associations. We then examined intercorrelations between domains of unknown function (DUFs) and domains involved in known metabolic pathways using network visualization and cluster-detection tools. We used a cautious “guilty-by-association” approach, referencing knowledge-level resources to identify and discuss associations that offer insight into DUF function. We observed numerous DUFs associated to photobiologically active domains and prevalent in the Cyanobacteria. Other clusters included DUFs associated with DNA maintenance and repair, inorganic nutrient metabolism, and sodium-translocating transport domains. We also observed a number of clusters reflecting known metabolic associations and cases that predicted functional reclassification of DUFs. Conclusion/Significance Critically examining domain covariation across metagenomic datasets can grant new perspectives on the roles and associations of DUFs in an ecological setting. Targeted attempts at DUF characterization in the laboratory or in silico may draw from these insights and opportunities to discover new associations and corroborate existing ones will arise as more large-scale metagenomic datasets emerge.
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  • 81
    Publikationsdatum: 2020-02-12
    Beschreibung: The construction of high capacity data sharing networks to support increasing government and commercial data exchange has highlighted a key roadblock: the content of existing Internet-connected information remains siloed due to a multiplicity of local languages and data dictionaries. This lack of a digital lingua franca is obvious in the domain of human food as materials travel from their wild or farm origin, through processing and distribution chains, to consumers. Well defined, hierarchical vocabulary, connected with logical relationships—in other words, an ontology—is urgently needed to help tackle data harmonization problems that span the domains of food security, safety, quality, production, distribution, and consumer health and convenience. FoodOn (http://foodon.org) is a consortium-driven project to build a comprehensive and easily accessible global farm-to-fork ontology about food, that accurately and consistently describes foods commonly known in cultures from around the world. FoodOn addresses food product terminology gaps and supports food traceability. Focusing on human and domesticated animal food description, FoodOn contains animal and plant food sources, food categories and products, and other facets like preservation processes, contact surfaces, and packaging. Much of FoodOn’s vocabulary comes from transforming LanguaL, a mature and popular food indexing thesaurus, into a World Wide Web Consortium (W3C) OWL Web Ontology Language-formatted vocabulary that provides system interoperability, quality control, and software-driven intelligence. FoodOn compliments other technologies facilitating food traceability, which is becoming critical in this age of increasing globalization of food networks.
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  • 82
    Publikationsdatum: 2019-03-08
    Beschreibung: The Southern Ocean houses a diverse and productive community of organisms. Unicellular eukaryotic diatoms are the main primary producers in this environment, where photosynthesis is limited by low concentrations of dissolved iron and large seasonal fluctuations in light, temperature and the extent of sea ice. How diatoms have adapted to this extreme environment is largely unknown. Here we present insights into the genome evolution of a cold-adapted diatom from the Southern Ocean, Fragilariopsis cylindrus based on a comparison with temperate diatoms. We find that approximately 24.7 per cent of the diploid F. cylindrus genome consists of genetic loci with alleles that are highly divergent from those of temperate diatoms (15.1 megabases of the total genome size of 61.1 megabases). These divergent alleles were differentially expressed across environmental conditions, including darkness, low iron, freezing, elevated temperature and increased CO2. Alleles with the largest ratio of non-synonymous to synonymous nucleotide substitutions also show the most pronounced condition-dependent expression, suggesting a correlation between diversifying selection and allelic differentiation. Divergent alleles may be involved in adaptation to environmental fluctuations in the Southern Ocean.
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  • 83
    Publikationsdatum: 2017-04-04
    Beschreibung: We perform an analysis on the dissipative Olami-Feder-Christensen model on a small world topology considering avalanche size differences. We show that when criticality appears, the probability density functions (PDFs) for the avalanche size differences at different times have fat tails with a q-Gaussian shape. This behavior does not depend on the time interval adopted and is found also when considering energy differences between real earthquakes. Such a result can be analytically understood if the sizes (released energies) of the avalanches (earthquakes) have no correlations. Our findings support the hypothesis that a self-organized criticality mechanism with long-range interactions is at the origin of seismic events and indicate that it is not possible to predict the magnitude of the next earthquake knowing those of the previous ones.
    Beschreibung: Published
    Beschreibung: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Beschreibung: JCR Journal
    Beschreibung: reserved
    Schlagwort(e): SOC, earthquakes interaction ; 05. General::05.01. Computational geophysics::05.01.04. Statistical analysis
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 84
    Publikationsdatum: 2017-04-04
    Beschreibung: The MW 8.8 mega-thrust earthquake and tsunami that occurred on February 27, 2010, offshore Maule region, Chile, was not unexpected. A clearly identified seismic gap existed in an area where tectonic loading has been accumulating since the great 1835 earthquake experienced and described by Darwin during the voyage of the Beagle. Here we jointly invert tsunami and geodetic data (InSAR, GPS, land-level changes), to derive a robust model for the co-seismic slip distribution and induced co-seismic stress changes, and compare them to past earthquakes and the pre-seismic locking distribution. We aim to assess if the Maule earthquake has filled the Darwin gap, decreasing the probability of a future shock . We find that the main slip patch is located to the north of the gap, overlapping the rupture zone of the MW 8.0 1928 earthquake, and that a secondary concentration of slip occurred to the south; the Darwin gap was only partially filled and a zone of high pre-seismic locking remains unbroken. This observation is not consistent with the assumption that distributions of seismic rupture might be correlated with pre-seismic locking, potentially allowing the anticipation of slip distributions in seismic gaps. Moreover, increased stress on this unbroken patch might have increased the probability of another major to great earthquake there in the near future.
    Beschreibung: Published
    Beschreibung: 173-177
    Beschreibung: 3.1. Fisica dei terremoti
    Beschreibung: 4.2. TTC - Modelli per la stima della pericolosità sismica a scala nazionale
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Source process ; Chile ; Tsunami ; Joint Inversion ; Seismic Gap ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 05. General::05.01. Computational geophysics::05.01.03. Inverse methods
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  • 85
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    Unbekannt
    Nature Publishing Group
    Publikationsdatum: 2017-04-04
    Beschreibung: Studies of past sea-level markers are commonly used to unveil the tectonic history and seismic behavior of subduction zones. We present new evidence on vertical motions of the Hellenic subduction zone as resulting from a suite of Late Pleistocene - Holocene shorelines in western Crete (Greece). Shoreline ages obtained by AMS radiocarbon dating of seashells, together with the reappraisal of shoreline ages from previous works, testify a long-term uplift rate of 2.5-2.7 mm/y. This average value, however, includes periods in which the vertical motions vary significantly: 2.6-3.2 mm/y subsidence rate from 42 ka to 23 ka, followed by ~7.7 mm/y sustained uplift rate from 23 ka to present. The last ~5 ky shows a relatively slower uplift rate of 3.0-3.3 mm/y, yet slightly higher than the long-term average. A preliminary tectonic model attempts at explaining these up and down motions by across-strike partitioning of fault activity in the subduction zone.
    Beschreibung: Published
    Beschreibung: 5677
    Beschreibung: 2T. Tettonica attiva
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): coastal geomorphology ; tectonic rates ; paleoshorelines ; subduction ; Crete ; 04. Solid Earth::04.04. Geology::04.04.03. Geomorphology ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 86
    Publikationsdatum: 2017-04-04
    Beschreibung: In this paper, we describe the 1809 eruption of Mt. Etna, Italy, which represents one historical rare case in which it is possible to observe details of the internal structure of the feeder system. This is possible thanks to the presence of two large pit craters located in the middle of the eruptive fracture field that allow studying a section of the shallow feeder system. Along the walls of one of these craters, we analysed well-exposed cross sections of the uppermost 15–20 m of the feeder system and related volcanic products. Here, we describe the structure, morphology and lithology of this portion of the 1809 feeder system, including the host rock which conditioned the propagation of the dyke, and compare the results with other recent eruptions. Finally, we propose the dynamic model of the magma behaviour inside a laterally-propagating feeder dyke, demonstrating how this dynamic triggered important changes in the eruptive style (from effusive/Strombolian to phreatomagmatic) during the same eruption. Our results are also useful for hazard assessment related to the development of flank eruptions, potentially the most hazardous type of eruption from basaltic volcanoes in densely urbanized areas, such as Mt. Etna.
    Beschreibung: Published
    Beschreibung: 1-11
    Beschreibung: 2T. Tettonica attiva
    Beschreibung: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Beschreibung: 3V. Dinamiche e scenari eruttivi
    Beschreibung: 4V. Vulcani e ambiente
    Beschreibung: 6A. Monitoraggio ambientale, sicurezza e territorio
    Beschreibung: N/A or not JCR
    Beschreibung: open
    Schlagwort(e): feeder dyke ; basaltic volcanoes ; flank eruptions ; Etna ; volcanic hazards ; sill ; volcanic rift ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.04. Thermodynamics ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 87
    Publikationsdatum: 2017-04-04
    Beschreibung: The 2011 Tohoku-oki (Mw 9.1) earthquake is so far the best-observed megathrust rupture, which allowed the collection of unprecedented offshore data. The joint inversion of tsunami waveforms (DART buoys, bottom pressure sensors, coastal wave gauges, and GPS-buoys) and static geodetic data (onshore GPS, seafloor displacements obtained by a GPS/acoustic combination technique), allows us to retrieve the slip distribution on a non-planar fault. We show that the inclusion of near-source data is necessary to image the details of slip pattern (maximum slip ,48 m, up to ,35 m close to the Japan trench), which generated the large and shallow seafloor coseismic deformations and the devastating inundation of the Japanese coast. We investigate the relation between the spatial distribution of previously inferred interseismic coupling and coseismic slip and we highlight the importance of seafloor geodetic measurements to constrain the interseismic coupling, which is one of the key-elements for long-term earthquake and tsunami hazard assessment.
    Beschreibung: Published
    Beschreibung: 385
    Beschreibung: 3.1. Fisica dei terremoti
    Beschreibung: N/A or not JCR
    Beschreibung: restricted
    Schlagwort(e): Tohoku ; Subduction ; Tsunami ; Inverse problem ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 88
    Publikationsdatum: 2017-04-04
    Beschreibung: Improving lava flow hazard assessment is one of the most important and challenging fields of volcanology, and has an immediate and practical impact on society. Here, we present a methodology for the quantitative assessment of lava flow hazards based on a combination of field data, numerical simulations and probability analyses. With the extensive data available on historic eruptions of Mt. Etna, going back over 2000 years, it has been possible to construct two hazard maps, one for flank and the other for summit eruptions, allowing a quantitative analysis of the most likely future courses of lava flows. The effective use of hazard maps of Etna may help in minimizing the damage from volcanic eruptions through correct land use in densely urbanized area with a population of almost one million people. Although this study was conducted on Mt. Etna, the approach used is designed to be applicable to other volcanic areas.
    Beschreibung: This work was developed within the framework of TecnoLab, the Laboratory for Technological Advance in Volcano Geophysics organized by INGV-CT, DIEES-UNICT, and DMI-UNICT.
    Beschreibung: Published
    Beschreibung: 3493
    Beschreibung: 1V. Storia e struttura dei sistemi vulcanici
    Beschreibung: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Beschreibung: 3V. Dinamiche e scenari eruttivi
    Beschreibung: 4V. Vulcani e ambiente
    Beschreibung: 6A. Monitoraggio ambientale, sicurezza e territorio
    Beschreibung: 3IT. Calcolo scientifico e sistemi informatici
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Lava flow hazard ; Etna ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous ; 05. General::05.02. Data dissemination::05.02.99. General or miscellaneous ; 05. General::05.08. Risk::05.08.99. General or miscellaneous
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 89
    Publikationsdatum: 2017-04-04
    Beschreibung: Background: Trace elements have been hypothesised to be involved in the pathogenesis of Multiple Sclerosis and volcanic degassing is the major natural sources of trace elements. Both incidence of Multiple Sclerosis in Catania and volcanic activity of Mount Etna have been significantly increased during the last 30 years. Due to prevailing trade winds direction, volcanic gases from Etna summit craters are mostly blown towards the eastern and southern sectors of the volcano. Objective: To evaluate the possible association between Multiple Sclerosis and exposure to volcanogenic trace elements. Methods: We evaluated prevalence and incidence of Multiple Sclerosis in four communities (47,234 inhabitants) located in the eastern flank and in two communities (52,210 inhabitants) located in the western flank of Mount Etna, respectively the most and least exposed area to crater gas emissions. Results: A higher prevalence was found in the population of the eastern flank compared to the population of the western one (137.6/100,000 versus 94.3/100,000; p-value 0.04). We found a borderline significantly higher incidence risk during the incidence study period (1980–2009) in the population of the eastern flank 4.6/100,000 (95% CI 3.1–5.9), compared with the western population 3.2/100,000 (95% CI 2.4–4.2) with a RR of 1.41 (95% CI 0.97–2.05; p-value 0.06). Incidence risks have increased over the time in both populations reaching a peak of 6.4/100,000 in the eastern flank and of 4.4/100.000 in the western flank during 2000–2009. Conclusion: We found a higher prevalence and incidence of Multiple Sclerosis among populations living in the eastern flank of Mount Etna. According to our data a possible role of TE cannot be ruled out as possible co-factor in the MS pathogenesis. However larger epidemiological study are needed to confirm this hypothesis.
    Beschreibung: Published
    Beschreibung: e74259
    Beschreibung: 6A. Monitoraggio ambientale, sicurezza e territorio
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Mt. Etna volcano ; Multiple Sclerosis ; trace elements ; volcanic activity ; 05. General::05.08. Risk::05.08.01. Environmental risk
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 90
    Publikationsdatum: 2017-04-04
    Beschreibung: In recent decades, geophysical investigations have detected wide magma reservoirs beneath quiescent calderas. However, the discovery of partially melted horizons inside the crust is not sufficient to put constraints on capability of reservoirs to supply cataclysmic eruptions, which strictly depends on the chemical-physical properties of magmas (composition, viscosity, gas content etc.), and thus on their differentiation histories. In this study, by using geochemical, isotopic and textural records of rocks erupted from the high-risk Campi Flegrei caldera, we show that the alkaline magmas have evolved toward a critical state of explosive behaviour over a time span shorter than the repose time of most volcanic systems and that these magmas have risen rapidly toward the surface. Moreover, similar results on the depth and timescale of magma storage were previously obtained for the neighbouring Somma-Vesuvius volcano. This consistency suggests that there might be a unique long-lived magma pool beneath the whole Neapolitan area.
    Beschreibung: Published
    Beschreibung: article 712
    Beschreibung: 2.3. TTC - Laboratori di chimica e fisica delle rocce
    Beschreibung: 3.5. Geologia e storia dei vulcani ed evoluzione dei magmi
    Beschreibung: 3.6. Fisica del vulcanismo
    Beschreibung: 4.3. TTC - Scenari di pericolosità vulcanica
    Beschreibung: N/A or not JCR
    Beschreibung: open
    Schlagwort(e): magma ; campi flegrei caldera ; 04. Solid Earth::04.04. Geology::04.04.05. Mineralogy and petrology ; 04. Solid Earth::04.08. Volcanology::04.08.03. Magmas ; 04. Solid Earth::04.08. Volcanology::04.08.05. Volcanic rocks ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 91
    facet.materialart.
    Unbekannt
    Nature Publishing Group
    Publikationsdatum: 2017-04-04
    Beschreibung: One of the key issues in forecasting volcanic eruptions is to detect signals that can track the propagation of dykes towards the surface. Continuous monitoring of active volcanoes helps significantly in achieving this goal. The seismic data presented here are unique, as they document surface faulting processes close (tens to a few hundred meters) to their source, namely the dyke tip. They originated nearby - and under - a seismic station that was subsequently destroyed by lava flows during eruptive activity at Etna volcano, Italy, in 2013. On February 20, a ~600 m-long and ~120 m wide NW-SE fracture field opened at an altitude between 2750 and 2900 m. The consequent rock dislocation caused the station to tilt and offset the seismic signal temporarily. Data acquisition continued until the arrival of the lava flow that led to the breakdown of the transmission system. Shallow ground fracturing and repeated low-frequency oscillations occurred during two stages in which the seismic signal underwent a maximum offset ~2.57 E+04 nm/s. Bridging instrumental recordings, fieldwork and conceptual modelling, these data are interpreted as the seismic footprints of a magmatic dyke intrusion that moved at speed ~0.02 m/s (first stage) and 0.46 m/s (second stage).
    Beschreibung: This work was supported by the MED-SUV project, which has received funding from the European Union’s Seventh Programme for research, technological development and demonstration under grant agreement No 308665.
    Beschreibung: Published
    Beschreibung: 11908
    Beschreibung: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): dyke propagation ; Etna ; seismic signals ; ground fracturing ; conceptual modelling ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 92
    Publikationsdatum: 2017-04-04
    Beschreibung: In recent years, an increasing number of surveys have definitively confirmed the seasonal presence of fin whales (Balaenoptera physalus) in highly productive regions of the Mediterranean Sea. Despite this, very little is yet known about the routes that the species seasonally follows within the Mediterranean basin and, particularly, in the Ionian area. The present study assesses for the first time fin whale acoustic presence offshore Eastern Sicily (Ionian Sea), throughout the processing of about 10 months of continuous acoustic monitoring. The recording of fin whale vocalizations was made possible by the cabled deep-sea multidisciplinary observatory, “NEMO-SN1”, deployed 25 km off the Catania harbor at a depth of about 2,100 meters. NEMO-SN1 is an operational node of the European Multidisciplinary Seafloor and water-column Observatory (EMSO) Research Infrastructure. The observatory was equipped with a low-frequency hydrophone (bandwidth: 0.05 Hz–1 kHz, sampling rate: 2 kHz) which continuously acquired data from July 2012 to May 2013. About 7,200 hours of acoustic data were analyzed by means of spectrogram display. Calls with the typical structure and patterns associated to the Mediterranean fin whale population were identified and monitored in the area for the first time. Furthermore, a background noise analysis within the fin whale communication frequency band (17.9–22.5 Hz) was conducted to investigate possible detection-masking effects. The study confirms the hypothesis that fin whales are present in the Ionian Sea throughout all seasons, with peaks in call detection rate during spring and summer months. The analysis also demonstrates that calls were more frequently detected in low background noise conditions. Further analysis will be performed to understand whether observed levels of noise limit the acoustic detection of the fin whales vocalizations, or whether the animals vocalize less in the presence of high background noise.
    Beschreibung: Published
    Beschreibung: e0141838
    Beschreibung: 3A. Ambiente Marino
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): Whales ; Bioacoustics ; Background noise (acoustics) ; Acoustic signals ; Sperm whales ; Vocalization ; Acoustics ; Data acquisition ; 03. Hydrosphere::03.01. General::03.01.08. Instruments and techniques ; 03. Hydrosphere::03.02. Hydrology::03.02.04. Measurements and monitoring ; 03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques ; 03. Hydrosphere::03.04. Chemical and biological::03.04.99. General or miscellaneous
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 93
    Publikationsdatum: 2017-04-04
    Beschreibung: In open conduit volcanoes, volatile-rich magma continuously enters into the feeding system nevertheless the eruptive activity occurs intermittently. From a practical perspective, the continuous steady input of magma in the feeding system is not able to produce eruptive events alone, but rather surplus of magma inputs are required to trigger the eruptive activity. The greater the amount of surplus of magma within the feeding system, the higher is the eruptive probability.Despite this observation, eruptive potential evaluations are commonly based on the regular magma supply, and in eruptive probability evaluations, generally any magma input has the same weight. Conversely, herein we present a novel approach based on the quantification of surplus of magma progressively intruded in the feeding system. To quantify the surplus of magma, we suggest to process temporal series of measurable parameters linked to the magma supply. We successfully performed a practical application on Mt Etna using the soil CO2 flux recorded over ten years.
    Beschreibung: Published
    Beschreibung: 30471
    Beschreibung: 2V. Dinamiche di unrest e scenari pre-eruttivi
    Beschreibung: 5V. Sorveglianza vulcanica ed emergenze
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): eruptive potential ; eruptive probability ; open conduit volcanoes ; Etna ; Soil CO2 flux ; 04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous ; 04. Solid Earth::04.08. Volcanology::04.08.01. Gases ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 05. General::05.08. Risk::05.08.01. Environmental risk
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 94
    Publikationsdatum: 2019-03-28
    Beschreibung: The understanding of the dynamical properties of skyrmion is a fundamental aspect for the realization of a competitive skyrmion based technology beyond CMOS. Most of the theoretical approaches are based on the approximation of a rigid skyrmion. However, thermal fluctuations can drive a continuous change of the skyrmion size via the excitation of thermal modes. Here, by taking advantage of the Hilbert-Huang transform, we demonstrate that at least two thermal modes can be excited which are non-stationary in time. In addition, one limit of the rigid skyrmion approximation is that this hypothesis does not allow for correctly describing the recent experimental evidence of skyrmion Hall angle dependence on the amplitude of the driving force, which is proportional to the injected current. In this work, we show that, in an ideal sample, the combined effect of field-like and damping-like torques on a breathing skyrmion can indeed give rise to such a current dependent skyrmion Hall angle. While here we design and control the breathing mode of the skyrmion, our results can be linked to the experiments by considering that the thermal fluctuations and/or disorder can excite the breathing mode. We also propose an experiment to validate our findings.
    Beschreibung: Published
    Beschreibung: 224418
    Beschreibung: 1A. Geomagnetismo e Paleomagnetismo
    Beschreibung: 2IT. Laboratori analitici e sperimentali
    Beschreibung: JCR Journal
    Schlagwort(e): Physics - Mesoscopic Systems and Quantum Hall Effect ; Physics - Mesoscopic Systems and Quantum Hall Effect
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 95
    Publikationsdatum: 2020-02-24
    Beschreibung: Hule and Rı´o Cuarto are maar lakes located 11 and 18 km N of Poa´s volcano along a 27 km long fracture zone, in the Central Volcanic Range of Costa Rica. Both lakes are characterized by a stable thermic and chemical stratification and recently they were affected by fish killing events likely related to the uprising of deep anoxic waters to the surface caused by rollover phenomena. The vertical profiles of temperature, pH, redox potential, chemical and isotopic compositions of water and dissolved gases, as well as prokaryotic diversity estimated by DNA fingerprinting and massive 16S rRNA pyrosequencing along the water column of the two lakes, have highlighted that different bio-geochemical processes occur in these meromictic lakes. Although the two lakes host different bacterial and archaeal phylogenetic groups, water and gas chemistry in both lakes is controlled by the same prokaryotic functions, especially regarding the CO2-CH4 cycle. Addition of hydrothermal CO2 through the bottom of the lakes plays a fundamental priming role in developing a stable water stratification and fuelling anoxic bacterial and archaeal populations. Methanogens and methane oxidizers as well as autotrophic and heterotrophic aerobic bacteria responsible of organic carbon recycling resulted to be stratified with depth and strictly related to the chemical-physical conditions and availability of free oxygen, affecting both the CO2 and CH4 chemical concentrations and their isotopic compositions along the water column. Hule and Rı´o Cuarto lakes were demonstrated to contain a CO2 (CH4, N2)-rich gas reservoir mainly controlled by the interactions occurring between geosphere and biosphere. Thus, we introduced the term of bio-activity volcanic lakes to distinguish these lakes, which have analogues worldwide (e.g. Kivu: D.R.C.-Rwanda; Albano, Monticchio and Averno: Italy; Pavin: France) from volcanic lakes only characterized by geogenic CO2 reservoir such as Nyos and Monoun (Cameroon).
    Beschreibung: Published
    Beschreibung: e102456
    Beschreibung: 4V. Vulcani e ambiente
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): bio activity, volcanic lakes, costa rica ; 03. Hydrosphere::03.04. Chemical and biological::03.04.06. Hydrothermal systems
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Standort Signatur Erwartet Verfügbarkeit
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  • 96
    facet.materialart.
    Unbekannt
    Nature Publishing Group
    In:  EPIC3Scientific Reports, Nature Publishing Group, 5, pp. 15865, ISSN: 2045-2322
    Publikationsdatum: 2015-10-31
    Beschreibung: Fire-induced permafrost degradation is well documented in boreal forests, but the role of fires in initiating thermokarst development in Arctic tundra is less well understood. Here we show that Arctic tundra fires may induce widespread thaw subsidence of permafrost terrain in the first seven years following the disturbance. Quantitative analysis of airborne LiDAR data acquired two and seven years post-fire, detected permafrost thaw subsidence across 34% of the burned tundra area studied, compared to less than 1% in similar undisturbed, ice-rich tundra terrain units. The variability in thermokarst development appears to be influenced by the interaction of tundra fire burn severity and near-surface, ground-ice content. Subsidence was greatest in severely burned, ice-rich upland terrain (yedoma), accounting for ~50% of the detected subsidence, despite representing only 30% of the fire disturbed study area. Microtopography increased by 340% in this terrain unit as a result of ice wedge degradation. Increases in the frequency, magnitude, and severity of tundra fires will contribute to future thermokarst development and associated landscape change in Arctic tundra regions.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 97
    Publikationsdatum: 2019-07-17
    Beschreibung: The mid-Piacenzian climate represents the most geologically recent interval of long-term average warmth relative to the last million years, and shares similarities with the climate projected for the end of the 21st century. As such, it represents a natural experiment from which we can gain insight into potential climate change impacts, enabling more informed policy decisions for mitigation and adaptation. Here, we present the first systematic comparison of Pliocene sea surface temperature (SST) between an ensemble of eight climate model simulations produced as part of PlioMIP (Pliocene Model Intercomparison Project) with the PRISM (Pliocene Research, Interpretation and Synoptic Mapping) Project mean annual SST field. Our results highlight key regional and dynamic situations where there is discord between the palaeoenvironmental reconstruction and the climate model simulations. These differences have led to improved strategies for both experimental design and temporal refinement of the palaeoenvironmental reconstruction.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 98
    Publikationsdatum: 2019-07-17
    Beschreibung: Comparing simulations of key warm periods in Earth history with contemporaneous geological proxy data is a useful approach for evaluating the ability of climate models to simulate warm, high-CO2 climates that are unprecedented in the more recent past. Here we use a global data set of confidence-assessed, proxy-based temperature estimates and biome reconstructions to assess the ability of eight models to simulate warm terrestrial climates of the Pliocene epoch. The Late Pliocene, 3.6–2.6 million years ago, is an accessible geological interval to understand climate processes of a warmer world. We show that model-predicted surface air temperatures reveal a substantial cold bias in the Northern Hemisphere. Particularly strong data–model mismatches in mean annual temperatures (up to 18 °C) exist in northern Russia. Our model sensitivity tests identify insufficient temporal constraints hampering the accurate configuration of model boundary conditions as an important factor impacting on data–model discrepancies. We conclude that to allow a more robust evaluation of the ability of present climate models to predict warm climates, future Pliocene data–model comparison studies should focus on orbitally defined time slices.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
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  • 99
    Publikationsdatum: 2017-10-18
    Beschreibung: Efforts to extract a Greenland ice core with a complete record of the Eemian interglacial (130,000 to 115,000 years ago) have until now been unsuccessful. The response of the Greenland ice sheet to the warmer-than-present climate of the Eemian has thus remained unclear. Here we present the new North Greenland Eemian Ice Drilling (‘NEEM’) ice core and show only a modest ice-sheet response to the strong warming in the early Eemian. We reconstructed the Eemian record from folded ice using globally homogeneous parameters known from dated Greenland and Antarctic ice-core records. On the basis of water stable isotopes, NEEM surface temperatures after the onset of the Eemian (126,000 years ago) peaked at 8 ± 4 degrees Celsius above the mean of the past millennium, followed by a gradual cooling that was probably driven by the decreasing summer insolation. Between 128,000 and 122,000 years ago, the thickness of the northwest Greenland ice sheet decreased by 400 ± 250 metres, reaching surface elevations 122,000 years ago of 130 ± 300 metres lower than the present. Extensive surface melt occurred at the NEEM site during the Eemian, a phenomenon witnessed when melt layers formed again at NEEM during the exceptional heat of July 2012. With additional warming, surface melt might become more common in the future.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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  • 100
    facet.materialart.
    Unbekannt
    American Physical Society
    In:  EPIC3Physical Review E, American Physical Society, 90, pp. 022711-1, ISSN: 1539-3755
    Publikationsdatum: 2014-11-04
    Beschreibung: The fascinating ability of algae, insects, and fishes to survive at temperatures below normal freezing is realized by antifreeze proteins (AFPs). These are surface-active molecules and interact with the diffusive water-ice interface thus preventing complete solidification. We propose a dynamical mechanism on how these proteins inhibit the freezing of water. We apply a Ginzburg-Landau-type approach to describe the phase separation in the two-component system (ice, AFP). The free-energy density involves two fields: one for the ice phase with a low AFP concentration and one for liquid water with a high AFP concentration. The time evolution of the ice reveals microstructures resulting from phase separation in the presence of AFPs. We observed a faster clustering of pre-ice structure connected to a locking of grain size by the action of AFP, which is an essentially dynamical process. The adsorption of additional water molecules is inhibited and the further growth of ice grains stopped. The interfacial energy between ice and water is lowered allowing the AFPs to form smaller critical ice nuclei. Similar to a hysteresis in magnetic materials we observe a thermodynamic hysteresis leading to a nonlinear density dependence of the freezing point depression in agreement with the experiments.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
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