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  • 1
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    München : Gerling-Akad.-Verl. | Wuppertal : Wuppertal Institut für Klima, Umwelt, Energie
    Publication Date: 2018-11-19
    Description: Gesellschaftliche Blindheit nennt der Ökonom und Umweltforscher Hans-Jochen Luhmann es, wenn die Öffentlichkeit die Augen verschließt: vor den Situationen großen Schadensausmaßes, den drohenden Gefahren und den Vorboten von Umwelt- und Gesundheitskatastrophen. Überzeugt, dass die Gesellschaft systematisch das Katastrophale an den unvermeidlichen Risiken vermeiden kann, hat er die Strukturen des Nichtwissenwollens untersucht, um daraus Strategien für die Vermeidung von zukünftigen Katastrophen zu entwickeln. "Wir haben es nicht gewusst!" - diese Blindheit der Gesellschaft hat Methode. Sie dingfest zu machen, sie in detaillierten Fallstudien aus den Bereichen Produkte, Technik, Banken/Unternehmen und Umwelt nachzuweisen, ist die Voraussetzung für ein Risiko-Management, das diese Bezeichnung verdient. Hans-Jochen Luhmann hat in "Die Blindheit der Gesellschaft" die Entdeckung von Umweltrisiken als Geschichte einer verzögerten Wahrnehmung gedeutet. Die Auflösung von gesellschaftlicher Blindheit - so seine These - kann nur dann gelingen, wenn ein neuer Standort bezogen wird. Ein Standort, der auf Erfahrung beruht, der das Verhalten in der Vergangenheit als Blindheit gegenüber dem Raubbau am Ganzen erscheinen lässt. Eine neue, gesellschaftliche, sphärenübergreifende "Sicherheitskultur" ist zu schaffen.
    Keywords: ddc:300
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: German
    Type: book , doc-type:book
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  • 2
    Publication Date: 2014-10-07
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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  • 3
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    Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
    In:  EPIC3Bremerhaven, Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
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  • 4
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    AMER METEOROLOGICAL SOC
    In:  EPIC3Journal of Physical Oceanography, AMER METEOROLOGICAL SOC, 31(10), pp. 3002-3019, ISSN: 0022-3670
    Publication Date: 2018-12-07
    Description: Numerical experiments with idealized OGCM are carried out to investigate the oceanic eastern boundary problems. The experimental results indicate that the eastward flow due to the north–south gradient of the surface density returns to the interior region through the lower half of the mixed layer, and this return flow generates a density jump just above the thermocline. Formulation for the mixed layer depth distribution at the eastern boundary is also presented, which is derived only from the geostrophy and no-normal flow condition. This formulation agrees well with the numerical experiment, and can be an appropriate eastern boundary condition for theoretical ventilated thermocline model with no deficiency of the mass balance on the boundary. Furthermore, the effects of such eastern boundary structure on the subtropical thermocline are studied. On the shallow thermocline in the subtropics, eastern boundary ventilated region emerges, which is identified as a region of high potential vorticity. In the deep thermocline, which does not outcrop in the subtropics, a cross-gyre ventilation occurs. This cross-gyre ventilation is caused by the density structure along the eastern boundary.
    Repository Name: EPIC Alfred Wegener Institut
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  • 5
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    International Glaciological Society
    In:  EPIC3International Symposium on Ice Cores and Climate, Kangerlussuaq, Hotel and Conference Center, 2001-08-19-2001-08-23Kangerlussuaq, Greenland, International Glaciological Society
    Publication Date: 2018-09-18
    Description: The paper presents first results from the upper 54 m of a 723.91 m ice core drilled on Academy of Sciences Ice Cap in 1999-2001, supplemented by data from shallow ice cores. The glacier's peculiarity is the infiltration and refreezing of melting water thereby changing original isotopic and chemical signals. Therefore, stratigraphical observations in these ice cores are more difficult than in those from central Greenland or Antarctica. However, the 1963 maximum of artificial radioactivity from atmospheric nuclear tests is clearly detectable in the deep ice core and the d180 profile of a 12.82 m shallow core shows annual variations. Consequently, an almost seasonal time resolution of paleoclirnate record could be expected at least for the upper part of the main core. The Chemobyl layer was detected by increased 137 Cs activity in depths between 11.81 m and 12.51 m related to the 2000 surface. The resulting mean annual net mass balance is 53 ± 2 g cm-2 a- 1. Data from dielectric profiling (DEP) of the main core show considerable peaks in conductivity; one of them was interpreted as volcano event. According to the resulting chronology this part of the core represents approximately the last 100 years.
    Repository Name: EPIC Alfred Wegener Institut
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  • 6
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    Micromeritics Instrument Corporation
    In:  EPIC3Norcross, GA, Micromeritics Instrument Corporation
    Publication Date: 2020-06-22
    Repository Name: EPIC Alfred Wegener Institut
    Type: PANGAEA Documentation , notRev
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  • 7
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    Interdisciplinary ZMK reports
    In:  EPIC3The Changing North Sea: Knowledge, Speculation and New Challenges – Synthesis and New Conception of North Sea Research (SYCON), Interdisciplinary ZMK reports, Z(3), pp. 137-161
    Publication Date: 2017-02-02
    Repository Name: EPIC Alfred Wegener Institut
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  • 8
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    Interdisciplinary ZMK Reports
    In:  EPIC3The Changing North Sea: Knowledge, Speculation and New Challenges. Synthesis and New Conception of North Sea Research (SYCON), Interdisciplinary ZMK Reports, Z(3), pp. 252-262
    Publication Date: 2017-02-02
    Repository Name: EPIC Alfred Wegener Institut
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  • 9
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    In:  EPIC3Stennis Space Center - Naval Research Laboratory, MS, 2001
    Publication Date: 2017-02-13
    Repository Name: EPIC Alfred Wegener Institut
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  • 10
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    In:  EPIC3Louisiana Universities Marine Consortium (LUMCON), Cocodrie, LA, USA, 2001
    Publication Date: 2017-02-13
    Repository Name: EPIC Alfred Wegener Institut
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  • 11
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    Interdisciplinary ZMK Reports
    In:  EPIC3The Changing North Sea: Knowledge, Speculation and New Challenges-Synthesis and New Conception of North Sea Research (SYCON), Interdisciplinary ZMK Reports, Z(9), pp. 85 pp
    Publication Date: 2017-02-02
    Repository Name: EPIC Alfred Wegener Institut
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  • 12
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    Interdisciplinary ZMK Reports
    In:  EPIC3The Changing North Sea: Knowledge, Speculation and New Challenges – Synthesis and New Conception of North Sea Research (SYCON), Interdisciplinary ZMK Reports, Z(3), pp. 137-161
    Publication Date: 2017-02-02
    Repository Name: EPIC Alfred Wegener Institut
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  • 13
    Publication Date: 2017-02-02
    Repository Name: EPIC Alfred Wegener Institut
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  • 14
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    In:  EPIC315th Scientific Conference of the Phycology Section of the German Botanical Society, Stralsund, Germany, 2014-02-23-2014-02-26
    Publication Date: 2016-02-05
    Description: The Western Antarctic Peninsula is one of the regions most affected by stratospheric ozone depletion and global climate warming, resulting in an increased UVB radiation and a fast glacier retreat. During the last 10 years intensive studies on the seaweed communities and the physiology of single species were conducted at Potter Cove. It was found that UVB radiation can decrease the diversity of the seaweed community by direct and indirect effects (exerting negative effects on the grazers). A higher sediment inflow into the water column due to the melting glaciers is decreasing the light availability for photosynthesis, changing the lower depth distribution of the seaweeds. Additional laboratory and field experiments on the physiological performance and recruitment success of seaweed spores showed a strong species specific susceptibility to UV and photosynthetically active radiation. Altogether the seaweed community at Potter Cove is strongly shaped by the changes of their abiotic environment.
    Repository Name: EPIC Alfred Wegener Institut
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  • 15
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    In:  EPIC3CliC Sea Ice Modeling and Observing Workshop, Tromsø, Norway, 2013-06-05-2013-06-07
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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  • 16
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    In:  EPIC3The Journal of Physical Chemistry B, 105(41), pp. 10091-10100, ISSN: 1520-6106
    Publication Date: 2018-02-12
    Repository Name: EPIC Alfred Wegener Institut
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  • 17
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    paper presented at Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting U.S. Dep. of Energy
    In:  EPIC3Atlanta, paper presented at Eleventh Atmospheric Radiation Measurement (ARM) Science Team Meeting U.S. Dep. of Energy
    Publication Date: 2018-04-13
    Repository Name: EPIC Alfred Wegener Institut
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  • 18
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    In:  EPIC3Margins Meeting, 2001-10-02-2001-10-06Kiel
    Publication Date: 2017-07-28
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  • 19
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    In:  Contributions to Zoology (1383-4517) vol.70 (2001) nr.1 p.23
    Publication Date: 2015-05-08
    Description: Carefully collected molecular data and rigorous analyses are revolutionizing today’s phylogenetic studies. Although molecular data have been used to estimate various invertebrate phylogenies lor more than a decade, this study is the first survey of different regions of mitochondrial DNA in isopod crustaceans assessing sequence divergence and hence the usefulness of these regions to infer phylogeny at different hierarchical levels. 1 evaluate three loci from the mitochondrial genome (two ribosomal RNAs (12S, 16S) and one protein-coding (COI)) for their appropriateness in inferring isopod phylogeny at the suborder level and below. The patterns are similar for all three loci with the most speciose suborders of isopods also having the most divergent mitochondrial nucleotide sequences. Recommendations for designing an order- or suborder-level molecular study in previously unstudied groups of Crustacea would include: (1) collecting a minimum of two-four species or genera thought to be most divergent, (2) sampling across the group of interest as equally as possible in terms of taxonomic representation and the distribution of species, (3) surveying several genes, and (4) carrying out preliminary alignments, checking data for nucleotide bias, transition/ transversion ratios, and saturation levels before committing to a large-scale sequencing effort.
    Keywords: mitochondrial DNA ; isopod ; Crustacea ; molecular ; 12S rRNA ; 16S rRNA ; COI
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 20
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    In:  Flora Malesiana Bulletin (0071-5778) vol.12 (2001) nr.7/8 p.347
    Publication Date: 2015-06-05
    Description: Java — Messrs. H. Wiriadinata (BO) and J. Bennett (OXF) collected 8 species of Strobilanthus between 16 and 30 September 1998, in West Java. Mr. H. Wiriadinata (BO), Dr. W. Meijer (KY), and IPB students made 10 samples of mosses on 28 March 1998, on G. Salak, Curug Nangka.
    Repository Name: National Museum of Natural History, Netherlands
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  • 21
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    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi (0031-5850) vol.17 (2001) nr.3 p.339
    Publication Date: 2015-04-20
    Description: As a prelude to a monograph of the genus Coprinus, types were studied of a number of species said to belong to Coprinus subsection Lanatuli (Coprinus alnivorus. C. alutaceivelatus, C. ammophilae, C. arachnoideus, C. asterophoroides, C. brunneistragulatus, C. bubalinus, C. citrinovelatus, C. colosseus, C. jonesii, C. lagopides, C. marcidus, C. pachydermus, C. palmeranus, C. roseistipitatus, C. scobicola, C. spadiceisporus, C. sylvicola, C. tectisporus, C. undulatus and C. xerophilus). As a result Coprinus alnivorus and C. lagopides are transferred to subsection Alachuani.
    Repository Name: National Museum of Natural History, Netherlands
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  • 22
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.3 p.589
    Publication Date: 2015-03-06
    Description: New nomenclatural combinations are validated for Pseuduvaria oxycarpa (transferred from Mitrephora) and P. luzonensis, P. unguiculata and P. pamattonis (all transferred from Orophea). All names are lectotypified.
    Keywords: Annonaceae ; Pseuduvaria ; nomenclatural combinations
    Repository Name: National Museum of Natural History, Netherlands
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  • 23
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.1 p.188
    Publication Date: 2015-03-06
    Description: This fine book consists of two parts: a general account (pp. 1-64) and a taxonomic account (pp. 65-451). The taxonomic account consists of detailed descriptions of all 466 species in 52 orchid genera that are known to occur in Southern Africa, i.e. the area covering the territories of South Africa, Namibia, Lesotho, Swaziland, and Botswana. A surprisingly high percentage of the species is illustrated with colour photographs of excellent quality. Distribution maps are provided for almost all taxa, while for each taxon a number of selected vouchers are given. This part of the book leaves little to be desired: keys to the species, references, synonymy, illustrations, cladograms, almost all one could wish to find in such a book is there, and this solid comprehensiveness makes Orchids of Southern Africa by far the best source ever produced on orchids from this region. Unlike European botanists working on tropical orchids, the authors of this book live in the area where their subjects occur, which is obviously a great advantage. It is for this reason that I feel justified in slightly qualifying my otherwise uniform praise. I am a little disappointed to find the notes on the ecology of the species in many cases quite superficial. The photographs often show the species growing in their habitats, and it is readily apparent that they usually occupy highly specific niches. Yet, not infrequently all that we learn of the ecology of a particular species is that it grows in damp grassland. Surely much more is known to the authors and their collaborators than what we find here.
    Repository Name: National Museum of Natural History, Netherlands
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  • 24
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.2 p.252
    Publication Date: 2015-03-06
    Description: A full review of books announced in this section may be published in Blumea at a later date.
    Repository Name: National Museum of Natural History, Netherlands
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  • 25
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.1 p.125
    Publication Date: 2015-03-06
    Description: Lauraceae are an important component of wet tropical forests and are well represented in the Flora Malesiana region. Their identification has been hampered by two factors: several of the genera are poorly defined and existing keys require both flowers and fruits, which are, however, rarely present together on a specimen. Here a key based almost entirely on flowering specimens is presented, problems in generic delimitation are discussed and vegetative characters helpful in generic identification are listed.
    Keywords: Lauraceae ; genera ; key ; Malesia ; flowers ; vegetative characters
    Repository Name: National Museum of Natural History, Netherlands
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  • 26
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.3 p.569
    Publication Date: 2015-03-06
    Description: A new Rhysotoechia, R. etmanii, was recently discovered during botanical surveys of the Crater Mt. Wildlife Management Area in Papua New Guinea.
    Keywords: Rhysotoechia ; Papua New Guinea ; botanical survey
    Repository Name: National Museum of Natural History, Netherlands
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  • 27
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.2 p.351
    Publication Date: 2015-03-06
    Description: The monophyletic genus Melastoma (Melastomataceae) is centred in Southeast Asia, but extends to India, South China, Japan, northern Australia, and Oceania. It comprises 22 species, two subspecies, and three varieties. Two new species, Melastoma sabahense and M. minahassae, and a new variety, M. sanguineum var. ranauensis, are described; two species are reduced to subspecies and variety, respectively, and the genus Otanthera is transferred to Melastoma. In many species, especially M. malabathricum, morphological characters vary locally, which resulted in the taxonomic recognition of numerous geographically restricted entities here considered synonyms. Most species of Melastoma are pioneers with a high dispersal capacity. This may have resulted in small, relatively isolated populations in which unique character combinations were stabilised locally.
    Keywords: Melastoma ; Otanthera ; revision ; Southeast Asia
    Repository Name: National Museum of Natural History, Netherlands
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  • 28
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.2 p.201
    Publication Date: 2015-03-06
    Description: Eleven October 2001 is the 80th birthday of Dr. Ding Hou, much appreciated Honorary Staff Member of our Nationaal Herbarium Nederland. Time to reflect on the life and career of this modest but highly productive and talented botanist. Ding Hou was born in 1921 in Hsingkan, Kiangsi Province, China. From 1941— 1945 he studied Botany for his BSc degree at the National Chung-Cheng University in Kiangsi, where he spent another two years as Botanical Assistant. From 1947- 1951 he held a similar position at the National Taiwan University in Taipei. He then moved to the United States of America where he earned an MA in Plant Taxonomy at the Washington University in St. Louis, Missouri in 1952, and his PhD on a revision of the genus Celastrus in 1955 under supervision of Robert E. Woodson, Jr. He also held research assistantships in St. Louis, from 1951-1952 in the Missouri Botanical Garden, and from 1954-1955 in the MO Herbarium. In 1955 he was appointed as Botanist at the Arnold Arboretum of Harvard University, but in 1956 he was lured away to Leiden by C.G.G.J, van Steenis who attached him to his then externally funded Flora Malesiana Team. In 1960 his appointment as Senior Scientific Officer at the Rijksherbarium secured him tenure until his retirement in 1986. However, that retirement date did not change Ding's daily pattern of work in the herbarium which will hopefully continue until long after his 80th birthday.
    Repository Name: National Museum of Natural History, Netherlands
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  • 29
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.3 p.526
    Publication Date: 2015-03-06
    Description: A full review of books announced in this section may be published in Blumea at a later date.
    Repository Name: National Museum of Natural History, Netherlands
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  • 30
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.1 p.99
    Publication Date: 2015-03-06
    Description: The genus Endiandra R.Br. (Lauraceae) has not been revised since Meissner (1864). Flora treatments and local revisions for this genus of about 100 species have been produced for Peninsular Malaysia (Kochummen, 1989) and Australia (Hyland, 1989) with ten and thirty-eight species, respectively. A revision of Endiandra in Borneo contributes to the taxonomic understanding of the genus. Eight species, with a possible ninth imperfectly known species, are recognized on the island. Three species, E. immersa, E. elongata, and E. rhizophoretum, are described as new; the five other species are E. clavigera Kosterm., E. ochracea Kosterm., E. kingiana Gamble, E. macrophylla (Blume) Boerl., and E. rubescens (Blume) Miq.; E. rigidior Kosterm. is an imperfectly known species. A key to the eight species, and descriptions, illustrations, discussions, and distribution maps of each species are provided.
    Keywords: Endiandra ; Lauraceae ; Borneo ; taxonomy
    Repository Name: National Museum of Natural History, Netherlands
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  • 31
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    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.46 (2001) nr.1 p.185
    Publication Date: 2015-03-06
    Description: Schizomeria carrii H.C. Hopkins, a new species from the Owen Stanley Mountains of Papua New Guinea, is described and illustrated.
    Keywords: Cunoniaceae ; Schizomeria ; New Guinea
    Repository Name: National Museum of Natural History, Netherlands
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  • 32
    Publication Date: 2019-07-17
    Description: Video transects in the eastern Weddell Sea were used to classify the mega-epibenthos into stages of recolonization after iceberg impact and unaffected fauna. Three site categories differing in bottom topography and concentration of grounded icebergs were analysed. At small iceberg banks and on a comparatively plain seabed 52 to 60% of undisturbed seafloor and below 20% at a large iceberg bank were found. The impact was calculated as a function of values for recently disturbed areas and an estimated recovery time. The results show that, statistically, the Antarctic benthos never reaches peak maturity and that iceberg scouring is among the 5 most significant disturbances that any large ecosystem on Earth experiences.
    Repository Name: EPIC Alfred Wegener Institut
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  • 33
    Publication Date: 2019-07-17
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  • 34
    Publication Date: 2019-07-16
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  • 35
    Publication Date: 2019-07-16
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  • 36
    Publication Date: 2019-07-16
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  • 37
    Publication Date: 2014-10-07
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  • 38
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    In:  EPIC3Advances in Laser Remote Sensing - selected papers, presented at the 20th ILRC, Vichy, France 10 - 14th July 2000", Editors : A. Dabas, C. Loth, J. Pelon; Edition de l'Ecole polytechnique, p., pp. 229-232, ISBN: 2-7302-0798-8
    Publication Date: 2019-07-16
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  • 39
    Publication Date: 2019-07-17
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  • 40
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    In:  EPIC3In: Ocean Circulation and Climate / G. Siedler, J. Church and J. Gould, eds. New York : Academic Press. p., pp. 271-302, ISBN: 0-12-641351-7
    Publication Date: 2019-07-16
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  • 41
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    In:  EPIC3Coastal marine ecosystems of Latin America / U. Seeliger & B. Kjerfve, eds. - Berlin: Springer, pp. 229-244, ISBN: 3-540-67228-1
    Publication Date: 2019-07-17
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  • 42
    Publication Date: 2019-07-16
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  • 43
    Publication Date: 2019-07-16
    Description: AbstractWe conducted an intercomparison of methods for the determination of 234Th in seawater. Samples were collected either from a shore-based 600 m water source, or from standard bottle casts collected in deep waters off Hawaii and in the Southern Ocean. We compared large volume techniques which rely upon Mn cartridges for the collection of dissolved 234Th and its detection via gamma counting (〉200 liter samples) with small volume methods that employed either direct beta counting, or beta counting after radiochemical purification (2-20-Liter samples). Unique to this study are the presentation of a novel 2 and 5 liter 234Th methods. This new method is an adaptation of 20-liter methods which are based on a coprecipitation of thorium with Mn oxides and the direct beta counting of the precipitate. These Mn coprecipitation methods were found to be superior to other methods due to ease of sample collection and processing and low overall analytical uncertainties.
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  • 44
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    In:  EPIC3Journal of experimental marine biology and ecology, 257(1), pp. 53-72
    Publication Date: 2019-07-16
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  • 45
    Publication Date: 2019-07-17
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  • 46
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    In:  EPIC3Global and Planetary Change, 30(3), pp. 197-229
    Publication Date: 2018-08-10
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  • 47
    Publication Date: 2019-07-16
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  • 48
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    In:  EPIC3Geophysical Research Letters, 28(8), pp. 1499-1502, ISSN: 0094-8276
    Publication Date: 2019-12-03
    Description: It has been shown that NOx is produced photochemically within the snowpack of polar regions. If emitted to the atmosphere, this processcould be a major source of NOx in remote snowcovered regions. We report here on measurements made at the German Antarctic station,Neumayer, during austral summer 1999, aimed at detecting and quantifying emissions of NOx from the surface snow. Gradients of NOxwere measured, and fluxes calculated using local meteorology measurements. On the 2 days of flux measurements, the derived fluxesshowed continual release from the snow surface, varying between similar to0 and 3x10(8) molecs/cm(2)/s. When not subject toturbulence, the variation was coincident with the uv diurnal cycle, suggesting rapid release once photochemically produced. Scaling thediurnal average of Feb. 7th (1.3x10(8) molecs/cm(2)/s) suggests an annual emission over Antarctica of the order 0.0076TgN.
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  • 49
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    In:  EPIC3Geophysical Research Letters, 28(15), pp. 2927-2930, ISSN: 0094-8276
    Publication Date: 2019-07-16
    Description: The importance of deep and bottom water formed in the Southern Ocean to the ventilation of theworld ocean abyss has been accepted by the oceanographic community. Uncertainties, however,exist about rate and exact location of dense water mass sinking around Antarctica. Based on watermass analysis, the Weddell Sea in the Atlantic sector has long been identified as being the majorsource for bottom water. The contribution of the Ross Sea in the western Pacific sector, althoughwith similar if not more favorable ingredients for dense bottom water formation, seemed to be minor.Observations and recent tracer analysis indicate that the Indian-Pacific sector might host sourceswhich together can compete with their Atlantic counterpart. Our numerical model results support asplitting of the Atlantic and Indian-Pacific contributions into roughly equal parts but for bottomwaters of different density. The observationally derived formation rate for dense Antarctic BottomWater on the order of 10 Sv (1 Sv = 10^6 m^3/s) is confirmed but doubles if the lighter componentof the Indian-Pacific sector is included. This places southern and northern hemisphere sources asequal contributors to the ventilation of the world ocean.
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  • 50
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    In:  EPIC3Geophysical Journal International, 144, pp. 632-646
    Publication Date: 2015-05-29
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  • 51
    Publication Date: 2019-07-17
    Description: Small scale distribution patterns of seabirds in the Antarctic Polar Front (APF) were investigated in relation to other biological, physical and chemical features during the ANT-XIII/2 research cruise of RV Polarstern from Dec 1995 to Jan 1996. The APF is characterized by steep gradients in sea surface temperature and salinity. Within the APF, gradient zones were closely associated with elevated levels of primary production, chlorophyll-a concentrations and zooplankton densities. Even broad-billed prions (Pachyptila vittata-group), which dominated the seabird community by 83% in carbon requirements, showed small scale distributional patterns that were positively related to primary production, chloropyll-a and total zooplankton densities. The findings demonstrate a close, direct link between fine scale physical processes in the APF and biological activity through several food web levels up to that of zooplankton-eating seabirds. Broad-billed prions appeared to forage on very small copepods (Oithona spp.) in close association with the front. Fish and squid eating predators showed poor correlations with small scale spatial structures of the APF. However, in a wider band around the APF, most top predators did occur in elevated densities, showing gradual spatio-temporal diffusion of the impact of the APF on higher trophic levels.
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  • 52
    Publication Date: 2019-07-17
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  • 53
    Publication Date: 2019-07-17
    Description: This paper deals with present-day gravity changes inresponse to the evolving Greenland ice sheet. We present a detailedcomputation from a three-dimensionalthermomechanical ice-sheet model which is interactivelycoupled with a self-gravitating spherical visco-elastic bedrock model.The coupled model is run over the last two glacial cycles to yield theloading evolution over time. Based on both the ice-sheet's long-term historyand its modern evolution averaged over thelast 200 years, results are presented of the absolute gravity trend that wouldarise from a ground surveyand of the corresponding geoid rate of change a satellite would see from space.The main results yield ground absolute gravity trends of the order of +/-1 microgal/yr over the ice-free areasand total geoid changes in the range between -0.1 and +0.3 mm/yr.These estimates could help to design futuremeasurement campaigns by revealing areas of strongsignal and/or specific patterns, although there are uncertainties associated withthe parameters adopted for the Earth's rheology and aspects of the ice sheetmodel.Given the instrumental accuracy ofa particular surveying method, these theoretical trends could also be useful toassess the required duration of a measurement campaign. According to our results,the present-day gravitational signal is dominated by the responseto past loading changes rather than current mass changes of the Greenland icesheet.We finally discuss the potential of inferring thepresent-day evolution of the Greenlandice sheet from the geoid rate of change measured by the future geodeticGRACE mission. We find that despite the anticipatedhigh quality data from satellites, such a methodis compromised by the uncertainties in the Earth model,the dominance of isostatic recovery on the current bedrock signal,and other inaccuracies inherent to the method itself.
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  • 54
    Publication Date: 2019-07-16
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  • 55
    Publication Date: 2017-10-20
    Description: Two algorithms have been used in a hybrid scheme in order to obtain sea iceconcentration maps at 12 km resolution from 19, 37, and 85 GHz SSM/I data.The first one is an algorithm based on the polarization difference near 90GHz and the second one is the NASA Team algorithm which uses the 19 and 37GHz SSM/I channels. Ice concentrations are calculated using the 85 GHzchannels. In addition, the lower frequency channels are used to decidewhether the data points belong to the ice-free ocean or to the ice-coveredarea. This combination of high and low frequency channels eliminatesincorrect high ice concentrations caused by weather effects over the in factice-free ocean using the rather weather independent low frequencies whileretaining high resolution over ice with the high frequency. The estimationof proper tie points for the 85 GHz algorithm was a major task. Astatistical linear regression method for reference brightness temperatureestimation was applied in order to avoid misarranged guesses of the tiepoints. This method requires independent ice concentration reference datawhich were derived from aircraft dual-polarized passive microwavemeasurements at 19 and 37 GHz and optical line scanner images. ERS-2 SARimages were used to analyze the capability of the SSM/I to resolve featuressuch as the evolution of the marginal ice zone in the Fram Strait and theStorfjorden Polynya. Two different numerical atmospheric models were used toanalyze the effect of an increased resolution of ice data from 50 to 12 kmon the model results. It was found that the representation of the ice edgezone significantly influences the modelled atmospheric boundary-layertemperatures. The temperatures obtained with the high resolution ice dataagree significantly better with aircraft observed data.
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  • 56
    Publication Date: 2019-07-17
    Description: At Helgoland, North Sea, growth of the high sublittoral brown macroalga Dictyota dichotoma (Hudson) Lamoroux was examined in October (time of tetraspore release) in an outdoor tank by exposing 2-day old germlings to 4 solar radiation treatments achieved with different filter materials or an additional artificial light source: PAR (395-700 nm), PAR + UV-A (320-700 nm), full solar spectrum, solar spectrum + artificial ultraviolet radiation (UVR). Based on length measurements over a period of 3 weeks, growth rate in germlings strongly decreased in conditions with UVR compared to PAR: by 14% under PAR + UV-A, by 31% under the full solar spectrum and by 65% with additional UVR. Although growth rates of germlings under UVR were reduced mainly in the first week, the plants did not regain the size of the untreated plants even after 9 weeks. Regardless of the exposure, no defects in morphology or anatomy including the exposed apical meristem were detected, except for a reduction in cell division rates perhaps due to additional cost for photoprotective or repair mechanisms. Depending on the actual position of D. dichotoma plants in the natural habitat, individuals in the high positions receive substantial amounts of the more harmful UV-B while those further down might only receive UV-A during part of the day, thus the effect of UV-B on growth of D. dichotoma will depend on its position in the field. The effects of tidal variation of the light climate and the implications of our results for the zonation of D. dichotoma are discussed.
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  • 57
    Publication Date: 2019-07-16
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  • 58
    Publication Date: 2019-07-17
    Description: Blooms of the marine diatom Skeletonema costatum were initiated in closed-system batch cultures with P-deficient medium under two different initial concentrations of dissolved molecular CO2 ([CO2,aq]: 20.6 and 4.5 µmol L-1). Algal C:N:P ratios strongly increased with decreasing P concentration. In the exponential growth phase, C:N ratios were 1.3 mol mol-1 higher in the low relative to the high [CO2,aq] treatment. There was no [CO2,aq] effect on C:N:P ratios during P-limited growth. Carbon isotope fractionation (ep) was 2-3 per mil higher in the high [CO2,aq] treatment. With growth rate decreasing due to P-limitation, ep increased in both [CO2,aq] treatments by 2-3 per mil despite decreasing [CO2,aq]. Under these conditions the effect of decreasing growth rate on isotope fractionation strongly dominated over that of declining CO2 availability. When extrapolated to the natural environment, these results imply that systematic changes in algal growth, as occurring during the course of phytoplankton blooms, may affect algal isotope fractionation. These results severely complicate the interpretation of carbon isotope measurements in suspended and sedimentary organic matter.
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  • 59
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    In:  EPIC3Quarterly Journal of the Royal Meteorological Society, 127, pp. 89-100
    Publication Date: 2019-07-17
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  • 60
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    In:  EPIC3Journal of physical oceanography, 31, pp. 143 - 173
    Publication Date: 2019-07-17
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  • 61
    Publication Date: 2016-03-15
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  • 62
    Publication Date: 2019-07-17
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  • 63
    Publication Date: 2019-07-17
    Description: The Antarctic Circumpolar Wave is now a well-known feature that can bedetected in atmospheric, oceanic mixed layer, and sea ice data. Inour coupled ice-ocean model driven by 40 years of daily atmosphericforcing data it represents a significant part of the interannualvariability, linking the sea ice and water mass formation processes inthe Weddell Sea with other areas in the Antarctic water ring. Inaddition our model results show a decadal-period wavelike anomalypattern near the coast of Antarctica, propagating westward at about 2cm/s. This coastally trapped, bottom-intensified phenomenonseems to have important effects on the dense water formation rate inthe Weddell Sea and even the occurrence of the Weddell polynya.
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  • 64
    Publication Date: 2019-07-17
    Description: Abstract:Based on a sediment vibro corer, a tool for the sampling of sub-seafloor groundwater aquifershas been developed and successfully deployed in a coastal area of the western Baltic. Thedevice was designed to obtain pure groundwater samples from coarse sediments to be used fortracer investigations and CFC age dating.Operated from a medium size research vessel, a well pipe tipped with a filter segment isvibrated into the sediment down to the aquifer. Groundwater entering the filter is pumped tothe ship by a conventional submersible pump situated in the well's filter tip. Groundwater iscontinuously analysed on board for O2, salinity, pH, Eh and temperature, prior to sampling forCFC and radioisotope analysis. All parametres indicate that pure groundwater had beenobtained.CFC concentrations are very low suggesting that the groundwater of this shallow sub-seaflooraquifer recharged prior to 1950. This finding is in accordance with other hydrogeologicalevidence that this aquifer, located only 4-5 metres below the seafloor, is connected to fairlydeep confined sandy aquifers on land of Pleistocene or Miocene age.Applying the method described, it is possible to obtain sufficient sample volumes foranalyses of natural groundwater tracers such as radon-222 and CFCs which can beused to trace submarine groundwater discharge as well as the origin ofgroundwater in such environments.Keywords: submarine springs, groundwater, pockmark, submarine well, CFC, radon
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  • 65
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    In:  EPIC3Marine Ecology Progress Series, 221, pp. 199-207
    Publication Date: 2019-07-17
    Description: A numerical model is proposed for investigatingthe potential of calcium carbonatedissolution in copepod guts. A sensitivityanalysis is performed to reveal criticalparameters. Gut clearance rate is dependent ontemperature and grazing rate and determines thetime scale on which ingested calcite is subjectto dissolution. Highest dissolution isobtained when the individual zooplankton isalternating between grazing and non-grazing and feedingis restricted to the night-time period. Model resultsshow that up to 70% of the ingested carbonate may bedissolved in the guts, considering reingestion of faecalpellets in the absence of a phytoplanktonbloom, while approximately15% dissolution is to be expectedin a bloom situation. An estimate is made for the contributionof calcite dissolution in copepod guts to the proposed globalcalcite loss in the water column.
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  • 66
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    In:  EPIC3Journal of theoretical biology, 208(3), pp. 295-313
    Publication Date: 2019-07-17
    Description: A generic chloroplast-based model for the carbon concentratingmechanism (CCM) in eukaryotic algae is presented. The finestructure of chloroplasts is represented by separate compartments:marginal and bulk stroma, pyrenoid, girdle lamella, bulk thylakoids,and central lamella traversing the pyrenoid. The roles of theindividual structural elements of the chloroplast with respect tothe CCM and the effect of carbonic anhydrase activity in variouscompartments are analyzed. Hypothetical HCO3- transport into theacidic thylakoid lumen is adjusted by imposing an optimizationprinciple: a given CO2 at the site of Rubisco is achievedwith minimum energy costs for the CCM. Our model is highlyefficient in terms of saturation of Rubisco carboxylase activityand the affinity of the chloroplast for CO2, if either a girdlelamella or a pyrenoid is present. The highest efficiency isachieved with a pyrenoid. A eukaryotic CCM is not necessarilyassociated with accumulation of dissolved inorganic carbon (DIC)as in cyanobacteria.Chloroplasts are categorized into four types corresponding tomorphological characteristics of all major algal classes with regardto the presence of pyrenoids, girdle lamellae, and the distributionof CA activity.
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  • 67
    Publication Date: 2019-07-16
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  • 68
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    In:  EPIC3Elsevier Oceanography Book Series, 65, 346 pp, Amsterdam, ISBN: 0-444-50946-1 and 0-
    Publication Date: 2019-07-17
    Description: Carbon dioxide is the most important greenhouse gas after water vapor in the atmosphere of the earth. More than 98% of the carbon of the atmosphere-ocean system is stored inthe oceans as dissolved inorganic carbon. The key for understanding critical processes of the marine carbon cycle is a sound knowledge of the seawater carbonate chemistry,including equilibrium and nonequilibrium properties as well as stable isotope fractionation.Presenting the first coherent text describing equilibrium and nonequilibrium properties and stable isotope fractionation among the elements of the carbonate system. This volume presents an overview and asynthesis of these subjects which should be useful for graduate students and researchers in various fields such as biogeochemistry, chemical oceanography, paleoceanography, marine biology, marinechemistry, marine geology, and others.The volume includes an introduction to the equilibrium properties of the carbonate system in which basic concepts such as equilibrium constants, alkalinity, pH scales, and buffering are discussed. It also dealswith the nonequilibrium properties of the seawater carbonate chemistry. Whereas principle of chemical kinetics are recapitulated, reaction rates and relaxation times of the carbonate system are considered indetails. The book also provides a general introduction to stable isotope fractionation and describes the partitioning of carbon, oxygen, and boron isotopes between the species of the carbonate system. Theappendix contains formulas for the equilibrium constants of the carbonate system, mathematical expressions to calculate carbonate system parameters, answers to exercises and more.http://www.elsevier.nl/inca/publications/store/6/2/2/4/8/7/index.htt
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  • 69
    Publication Date: 2019-07-17
    Description: The sublittoral red alga Delesseria sanguinea was pre-cultivated in the laboratory in a predominantly green light field at 10 µmol m-2s-1 (10°C), with an approximately 0.5% daily increase in blade area. Such pre-cultivated blades were exposed horizontally in flow-through chambers for 5-6 days in April or May to solar radiation reduced to 11 or 19% by neutral density screens. In all three experiments conducted, the full solar spectrum (UVB+UVA+PAR) reduced growth rate significantly to 0-50% of values obtained in PAR alone, while this occurred with UVA+PAR only in one experiment. The growth rate of a Delesseria blade may thus be used as a sensitive and reliable biological indicator of UVB in natural solar radiation at a pre-chosen, neutral reduction level. Rapid measurements of growth rate of apical parts of Delesseria blades during and after UVB+UVA pulses of 2, 3 or 6 h duration were performed in the laboratory by measuring thallus area every 2 min by use of a CCD camera coupled to an on-line, computer-aided image analysis system. A single pulse of 2 or 3 h duration administered during the light phase caused a temporary drop in growth rate during and after the pulse, with recovery starting 2.5 h after the end of the pulse and completed by the end of the light phase. A single 6-h pulse at a biologically effective UVB dose (BEDDNA300nm) weighted according to Setlow (1974) of only 0.5 kJ m-2 reduced growth rate by 55% if administered around noon, or halted growth almost completely, if supplied at night, when no photoreactivation was possible. The UVB-sensitive behaviour of Delesseria compares well with the highly sensitive phytoplankton alga Emiliana huxleyi whose growth was reported to be halted at a daily, weighted BEDDNA300nm of 0.4 kJ m-2 administered during 4 days for 3 h in the middle of the light period.
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  • 70
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    In:  EPIC3Canadian journal of botany = Revue canadienne de botanique:, 79, pp. 649-656
    Publication Date: 2019-07-17
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  • 71
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    In:  EPIC3Ocean Challenge, 10(3), pp. 21-26
    Publication Date: 2019-07-17
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  • 72
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    In:  EPIC3ECSA Bulletin, 36, 19 p., ISSN: 1352-4615
    Publication Date: 2019-07-16
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  • 73
    Publication Date: 2019-07-17
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  • 74
    Publication Date: 2019-07-17
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  • 75
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    In:  EPIC3Journal of Experimental Marine Biology and Ecology, 259(1), pp. 85-107
    Publication Date: 2019-07-17
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  • 76
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    In:  EPIC3Marine Ecology Progress Series, 219, pp. 291-298
    Publication Date: 2014-10-07
    Description: Deep-sea sediments beneath double-ridged crawling trails and around two sessile epibenthic species, the sea anemone Bathyphellia margaritacea Danielssen, 1890 and the demosponge Thenea abyssorum Koltun, 1959, were investigated to test whether they support a bacterial colonisation significantly higher than that of nearby control sediments. The centimetre-scale features and the control sites with a virtually undisturbed sediment surface were sampled in two basin-like depressions in Fram Strait (Molloy Deep, 5552 m; Hayes Deep, 3668 m), and on the eastern Greenland continental rise (3139 m) using a Remotely Operated Vehicle. The uppermost 5 cm-thick layer of the sediment around the two species and beneath the trails contained a significantly higher total bacterial biomass (TBB) than the control sediments. The higher TBB values resulted either from higher total numbers of sedimentary bacteria (TBN), from a higher mean biomass per cell (MBC), or both. Sediments beneath the crawling trails were inhabited by significantly more bacteria than the control sediment. The mean cell biomass of the bacteria did not differ. The TBN around the sea anemone B. margaritacea and in control samples were almost in the same range; the MBC around the anemones, however, was significantly higher than in the control sediments. The higher TBB in the sediment around the sponge T. abyssorum resulted from higher values of both TBN and MBC. Our results confirmed that small epibenthic species and crawling trails sufficiently modify the surrounding sediment-seawater interface to affect the abundance and biomass of sediment-associated biota. The biogenic structures locally increase bacterial colonisation at the sediment-water interface and thus potentially increase habitat heterogeneity for the smallest benthic organisms.
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  • 77
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    In:  EPIC3Observing the Ocean for Climate in the 21st Century, C. Koblinsky and N. Smith (Eds.), GODAE Project Office, Bureau of Meteorology, Melbourne, Australia.
    Publication Date: 2014-04-15
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  • 78
    Publication Date: 2019-07-17
    Description: One hundred and seventy three bacterial strains, isolated previously after enrichment under oligotrophic, psychrophilic conditions from Arctic (98 strains) and Antarctic seawater (75 strains), were characterized by gas-liquid chromatographic analysis of their fatty acid compositions. By numerical analysis, 8 clusters, containing 2 to 59 strains, could be delineated, and 8 strains formed separate branches. Five clusters contained strains from both poles, two minor clusters were confined to Arctic isolates, and one cluster consisted of Antarctic isolates only. The 16S rRNA genes from 23 strains, representing the different fatty acid profile clusters and including the unclustered strains, were sequenced. The sequences grouped with the alpha and gamma Proteobacteria, the high percent G+C Gram-positives, and the Cytophaga-Flavobacterium-Bacteroides branch. The sequences of strains from 4 clusters and of 7 unclustered strains were closely related (sequence similarities above 97%) to reference sequences of Sulfitobacter mediterraneus, Halomonas variabilis, Alteromonas macleodii, Pseudoalteromonas species, Shewanella frigidimarina, and Rhodococcus fascians. Strains from the other four clusters and an unclustered strain showed sequence similarities below 97% with nearest named neighbours, including Rhizobium, Glaciecola, Pseudomonas, Alteromonas macleodii and Cytophaga marinoflava, indicating that the clusters which they represent form as yet unnamed taxa.
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  • 79
    Publication Date: 2019-07-17
    Description: A marine Antarctic psychrotolerant bacterium(strain ANT/505), isolated from sea ice-covered surfacewater from the Southern Ocean, showed pectinolytic activ-ity on citrus pectin agar. The sequencing of the 16S rRNAof isolate ANT/505 indicates a taxonomic affiliation toPseudoalteromonas haloplanktis. The supernatant of thisstrain showed three different pectinolytic activities aftergrowth on citrus pectin. By activity screening of a genomicDNA library of isolate ANT/505 in Escherichia coli, two dif-ferent pectinolytic clones could be isolated. Subcloning andsequencing revealed two open reading frames (ORF) of1,671 and 1,968 nt, corresponding to proteins of 68 and75 kDa, respectively. The deduced amino acid sequence ofthe two ORFs showed homology to pectate lyases fromErwinia chrysanthemi and Aspergillus nidulans. The pectatelyases contain signal peptides of 17 and 26 amino acids thatwere correctly processed after overexpression in E. coliBL21. Both enzymes were purified by anionic exchangechromatography. Maximal enzymatic activities for bothpectate lyases were observed at 30°C and a pH range of 9to 10. The Km values of both lyases for pectate and citruspectin were 1 g l 1 and 5 g l 1 , respectively. Calcium wasrequired for activity on pectic substrates, whereas theaddition of 1 mM ethylenediaminetetraacetic acid (EDTA)resulted in complete inhibition of the enzymes. These twoenzymes represent the first pectate lyases isolated and char-acterized from a cold-adapted marine bacterium.
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  • 80
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    In:  EPIC3Palaeogeography, Palaeoclimatology, Palaeoecology 174, pp. 123-144
    Publication Date: 2019-07-17
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  • 81
    Publication Date: 2019-07-16
    Description: In January to March 1997, a RV Polarstern cruise transected the Weddell Sea resulted in samples being taken in thick pack ice in the southeastern Weddell Sea and then along the marginal ice edge towards the Antarctic Peninsula. Several ice types were thus sampled, over a wide geographic area during late summer/early autumn. During the first 2/3 of the cruise summer conditions prevailed, with air temperatures around 0°C and there was extensive snow melt. A common feature of the ice was the occurrence of surface ponds. Another significant feature during this first warm period was that many floes had quasi-continuous horizontal gaps. The underlying ice was often very porous and rotten. By the onset of cold air temperatures in late February the gaps rapidly started to refreeze, and the gap layer was quickly frozen onto the underside of the overlying ice.The calanoid copepod Stephos longipes occurred in all habitats encountered and showed highest numbers in the surface ice in summer, in the gap water during both seasons and in the refrozen gap water in autumn. Nauplii outnumbered copepodids in the surface ice and refrozen gap water while in the gap water copepodids, mainly stages CI-CIII in summer and CII-CIV in autumn, comprised about 70% of the total population. The harpacticoid species Drescheriella glacialis did not occur in all habitats but was missing in surface ponds and new ice. Nauplii of D. glacialis were rarely found in gap water, but they predominated in the refrozen gaps.Key words: sea ice, copepods, Stephos longipes, Drescheriella glacialis, seasonality
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  • 82
    Publication Date: 2019-07-17
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  • 83
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    In:  EPIC3Botanicheskiy zhurnal 86(5), 39-45, (in Russian)
    Publication Date: 2019-07-17
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  • 84
    Publication Date: 2019-07-17
    Description: Particle flux data from 27 sites in the Atlantic Ocean have been compiled with a view to determining regional variations in the strength and efficiency of the biological pump and quantifying basin-wide fluxes and estimating the potential oceanic sequestration of atmospheric CO2. An algorithm is derived relating annual particulate organic carbon (POC) flux to primary production and depth that yields variations in the Export Ratio (ER = POC FLUX/Primary Production) at 125 m of between 0.1 and 0.4 over the range of production from 50 to 400 gCm-2 yr-2. Significant regional differences in changes of the ER with depth are related to the temporal stability of flux. Sites with more pulsed export have higher shallow ERs and show more rapid degradation of particulate organic carbon (POC) flux with depth, resulting in little variation in fluxes below ca. 3000 m. The opposing effects of organic carbon production and calcification on pCO2 of surface seawater are combined to calculate an "effective carbon flux" at the depth ofeuphotic zone and at the base of the winter mixed layer. POC flux at the base of the euphotic zone between 65°N and 65°S amounts to 3.14 Gt C yr-1, of which 5.7% is remineralised above the winter mixed layer, and is thus not available to sequestration on climatically relevant time scales. The effective carbon flux, termed Jeff, amounts to 2.47 Gt C yr-1 and is a measure of the potential sequestration of atmospheric CO2 for the area considered. A shift in the composition of sedimenting particles (opal: carbonate ratio) is seen across the entire North Atlantic, indicating a basin-wide phenomenon that may be related to large-scale changes in climatic forcing.
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  • 85
    Publication Date: 2019-07-16
    Description: Time series of satellite radar backscatter coefficients of the ERS-1/2 scatterometer are presented for perennial ice regions in the Antarctic from June 1991 to June 1999. There is a pronounced seasonal cycle, with higher backscatter in summer than in winter. On average, backscatter increases from spring values of 16.3 dB to summer values of 10.7 dB within 96 days. This rapid rise, and the summer maximum, are occasionally interrupted by sudden strong signal drops. After late summer/early fall, backscatter decreases again and slowly approaches winter values. The seasonal cycle is interpreted in terms of processes at the ice surface. The spring backscatter rise is associated with internal snow melt and the formation of superimposed ice. This process commences once the surface energy balance becomes positive. Sudden backscatter drops are caused by temporary melt water saturation of the snow during episodic events of warm air advection. In fall, when superimposed ice formation ceases due to surface cooling, gradual surface flooding with seawater becomes the dominating process. This causes the observed decreasing backscatter. The re-occurrence of the seasonal backscatter cycle in most regions points to the widespread formation of superimposed ice on perennial Antarctic sea ice.
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  • 86
    Publication Date: 2016-07-19
    Description: The development of benthic macrofauna in the Wadden Sea and in the coastal North Sea after the severe winter of 1995/96 is compared with the preceding years with mild to moderate winters. In the intertidal of the Wadden Sea, ice-drift and low temperature caused the expected changes in species composition by increasing winter mortality in sensitive species, and by exceptionally high recruitment of some species during the succeeding summer. In the shallow subtidal (10-20 m depth), similar winter effects were observed. However, recovery of many subtidal populations was still incomplete until the summer of 1997. It is suggested that this was due to hydrographic conditions that carried many larvae or drifting juveniles into more distant offshore areas. This may have limited larval supply and may have delayed recovery at the onshore sites. Since in the eastern North Sea severe winters are accompanied by frequent easterly winds, it is not clear whether decreasing winter abundances in some species were due to increased mortality, or to a seaward dislocation of organisms.
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  • 87
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    In:  EPIC3Marine Geophysical Researches, 22, pp. 323-343
    Publication Date: 2015-05-29
    Description: Sediment drifts provide information on the palaeoceanographic development of a region. Additionally, they may represent hydrocarbon reservoirs. Because of this, sediment drift investigation has increased over the last few years. Nevertheless, a number of problems remain regarding the processes controlling their shape, the characteristic lithological and seismic patterns and the diagnostic criteria.As an example, sediment drifts from the Agulhas Plateau, southwest Indian Ocean, are presented here. They show a variety of seismic features and facies including an asymmetric mounded geometry, changes in internal reflection pattern, truncation of internal reflectors at the seafloor and discontinuities. This collection of observations in combination with the local oceanography appears to comprise a diagnostic tool for sediment drifts.
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  • 88
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    In:  EPIC3In: Negendank, J F W (2001) Klimaweißbuch. Terra Nostra, 7, pp. 67-70
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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  • 89
    Publication Date: 2019-12-03
    Repository Name: EPIC Alfred Wegener Institut
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  • 90
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    In:  EPIC3Forest Ecology and Management, 144(1), pp. 101-111
    Publication Date: 2019-07-17
    Description: In this paper previously unpublished eld data from 25 ha of permanent samplingplots (PSPs) in Sabah, Malaysia, in four different forest reserves areanalysed for mortality rates and basal area development. Field data of anobservation length of 9 to 20 years were available. These data then formthe basis of several benchmark tests for the evaluation of theindividual-oriented tropical rain forest growth model FORMIND.A new version of the FORMIND is presented. The model in its version FORMIND1.1includes enhanced submodels for mortality and tree growth. The modelevaluation is focused on the model components for tree growth, competitionand mortality. Data for tree recruitment were not available. Results showa good agreement between simulation and eld data for the main output variablesbasal area and stem number indicating a reasonable behaviour of the modelcomponents we focused on. Furthermore the results show that differences insite conditions inuence tree growth and mortality. Site characteristics shouldbe included in the model in the future.
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  • 91
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    In:  EPIC3Journal of Glaciology, Vol. 47, No. 154, pp. 351-358
    Publication Date: 2019-07-17
    Description: One of the questions still unanswered concerning the surge behavior of glaciersis their quasi-periodic occurrence.Some results on the influence of climate on surges of Variegated Glacier, Alaska, are discussed here.The main emphasis is put on the phenomenological connection between cumulative balance and surge initiation.Based on climate data from a neighboring weather station, a correlation betweenprecipitation, minimum temperature and local annual balance at a location in theaccumulation area is established for the period 1973-82.Additional data from two other weather stations make it possible to reconstructthe local annual balance back to 1905.The ice equivalent local cumulative balance between the last four surges in 1946/47, 1964/65, 1982/83 and 1994/95 is on average 43.5 m, with a1$\sigma$-error of 1.2~m.This surge level provides an explanation for the varying lengths of the surge intervals of Variegated Glacier.The initiation of a surge is determined by the accumulation of mass during the quiescent period prior to the surge, and thus by the average annual mass balancein the previous surge interval.This explanation for the length of the quiescent inverval cannot be directly interpreted in physical terms and the surge level can therefore not beused to explain the observed differences in surge intervals between different glaciers.The surge level is used to hindcast former unobserved surges, to compare the results with other surge datings obtained from photographs, and to establish a complete surge history for Variegated Glacier for the 20th century.
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  • 92
    Publication Date: 2019-07-17
    Description: The clay mineral distribution in sediments between Indonesia and NW Australia has been assessed on the basis of 166 core-top samples. Clay mineral assemblages are closely related to the geology and weathering regime of the adjacent hinterland and allow the distinction of four clay mineral provinces. Three provinces, Western, Central and Eastern Province are situated along the Indonesian Islands Arc, from Sumatra in the west to Timor in the east. Illite is the major clay mineral of the Western and eastern Province, whereas the Central Province abounds with smectite. The fourth province comprises the NW and West-Australian shelf and slope, as well as offshore plateaus and is dominated by kaolinite. Transport of clays by surface and subsurface ocean currents can be observed within the provinces, e.g. with the Leeuwin and West Australian Current in the NW Australian Province and with the outflow of low-salinity water through the Sunda and Lombok straits in the Central Province. Transport of clays across province boundaries is inhibited by strong salinity fronts, with the exception of the boundary between the Central and Eastern Province.
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  • 93
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    In:  EPIC3Journal of Applied Ecology, 38(4), pp. 756-770
    Publication Date: 2019-07-17
    Description: Reliable data on the growth and yield of logged-over forest to determinesustainable cutting cycles are widely missing for the tropics. We used theprocess-based model Formind2.0 to analyse the growth and yield of logged-overforest in Venezuela under different logging scenarios over a period of 240years and compared results with unlogged stands.The performance of the modelwas evaluated with a detailed stability and sensitivity analysis.In theabsence of further logging,the logged-over stand approached the standstructure of mature forest in terms of bole volume and basal area afterabout 50-100 years.Thirty-year cutting cycles with conventional loggingmethods and net extraction volumes of 45 and 60 m^3/(ha cycle) did not providesustainable yields under either of two minimum felling diameters(35 or 50 cm) that were applied. Only the 60-year cutting cycle providedsustainable yields under conventional and reduced-impact logging with thedi minimum felling diameters and a range of net volumes extracted(30-60 m^3/(ha cycle). With the longest cutting cycle (60 years), bole volumerecovered to levels similar to the mature unlogged stand, but the speciescomposition was very different.Scenarios with reduced-impact logging provideda significantly higher timber volume than under conventional logging. Theconservation of forest resources will only be possible with long cuttingcycles (at least 60 years) in combination with reduced-impact logging.
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  • 94
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    In:  EPIC3South african journal of science, 97, 2001, pp. 239-246
    Publication Date: 2019-07-17
    Description: Nutrient and dissolved organic carbon (DOC) distributions were determined in July 1999 in the northern Benguela upwelling and Angola-Benguela front area. Highest silicate and phosphate surface concentrations of up to 30 µM and 3.7 µM, respectively, were determined in recently upwelled waters between 19°S and 21°S off Namibia. Nitrate, on the other hand, exhibited there a local minimum, which indicates an advanced bloom of non-siliceous phytoplankton. Nitrate and DOC concentrations increased with distance from the upwelling centre (up to 15 µM and 720 µM, respectively), probably due to mineralisation of phytoplankton-derived organic compounds, whereas silicate strongly decreased. Growth of siliceous phytoplankton, which covered their nitrogen requirements by nutrient recycling within the photic layer, probably caused this pattern in aged waters surround the upwelling. Contrary to primary production in the upwelling centre, this phytoplankton growth was therefore not "new production". Primary production was presumably limited by nitrate in recently upwelled waters and by silicate in aged waters. Phosphate was probably not limiting, indicated by low N/P ratios in surface waters (〈10) and low surface depletion. Regeneration of silicate and phosphate was evident in source waters of upwelling in ~100 m depth. Silicate increased exponentially from off- to onshore by the factor ~10, phosphate increased by ~30%. Regenerated silicate was ~25 µM, phosphate ~0.5 µM. Nitrate was not regenerated and oscillated apparently randomly between 11 µM and 24 µM at 100 m depth. Ammonium and nitrite increased exponentially from off- to onshore, indicating mineralisation of nitrogenous compounds, but contributed only 3% to dissolved inorganic nitrogen on average. In the front area no evidence for nutrient trapping was found. The lack of nitrogen regeneration and strongly decreasing N/P and N/Si ratios shoreward are evidences for considerable nitrogen losses off Namibia. Denitrification, which is favoured by the oxygen deficit in source waters, is the probable reason for these losses. Since denitrification was disregarded in the past, the productivity of northern Benguela and its role as carbon sink has presumably been overestimated.
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  • 95
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    In:  EPIC3JOURNAL OF CRUSTACEAN BIOLOGY, 21, pp. 821-838
    Publication Date: 2019-07-17
    Description: Larvae of the grapsid crab Armases angustipes DANA, 1852 (originating from the coast of the state of São Paulo, Brazil) were reared in the laboratory from hatching to the megalopa stage. In this paper, the morphology of the four zoeal stages and the megalopa is described and illustrated. Morphological comparisons are made with all descriptions that have become available for the larvae of this genus (including an unpublished description of A. angustipes; Kowalzuck, 1994) and of some closely related genera (Aratus, Sesarma). Several differences to the previous description of A. angustipes are shown, and additional characters such as the previously undescribed cephalotoracic setation of the larval stages are described and illustrated. Diagnostic characters are provided to differentiate the American genera Sesarma and Armases.
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  • 96
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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  • 97
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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  • 98
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    In:  EPIC3Science, 292, pp. 1670-1671
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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  • 99
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    In:  EPIC3Eiskalte Entdeckungen : Forschungsreisen zwischen Nord- und Südpol / hrsg. von Gert Lange. Mit fünf künstlerischen Fotogr. von Britta Lauer. Bielefeld : Delius Klasing, pp. 93-96, ISBN: 3-7688-1257-X
    Publication Date: 2014-04-15
    Repository Name: EPIC Alfred Wegener Institut
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  • 100
    Publication Date: 2019-07-17
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