ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract The potential for preservation of thecosome pteropods is thought to be largely governed by the chemical stability of their delicate aragonitic shells in seawater. However, sediment trap studies have found that significant carbonate dissolution can occur above the carbonate saturation horizon. Here we present the results from experiments conducted on two cruises to the Scotia Sea to directly test whether the breakdown of the organic pteropod body influences shell dissolution. We find that on the timescales of 3 to 13 days, the oxidation of organic matter within the shells of dead pteropods is a stronger driver of shell dissolution than the aragonite saturation state of seawater. Three to four days after death, shells became milky white and nano scanning electron microscope images reveal smoothing of internal surface features and increased shell porosity, both indicative of aragonite dissolution. These findings have implications for the interpretation of the condition of pteropod shells from sediment traps and the fossil record, as well as for understanding the processes controlling particulate carbonate export from the surface ocean.
    Print ISSN: 0886-6236
    Electronic ISSN: 1944-9224
    Topics: Biology , Chemistry and Pharmacology , Geography , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    The Paleocene-Eocene Thermal Maximum: How much carbon is enough? (2014)
    Wiley
    Details
    Publication Date: 2014-09-21
    Description: The Paleocene-Eocene Thermal Maximum (PETM), ~55.53 million years before present, was an abrupt warming event that involved profound changes in the carbon cycle and led to major perturbations of marine and terrestrial ecosystems. The PETM was triggered by the release of a massive amount of carbon, and thus the event provides an analogue for future climate and environmental changes given current anthropogenic CO 2 emissions. Previous attempts to constrain the amount of carbon released have produced widely diverging results, between 2000 and 10000 gigatonnes carbon (GtC). Here we use the UVic Earth System Climate Model in conjunction with a recently published compilation of PETM temperatures [14] to constrain the initial atmospheric CO 2 concentration as well as the total mass of carbon released during the event. Thirty-six simulations were initialized with varying ocean alkalinity, river runoff, and ocean sediment cover. Simulating various combinations of pre-PETM CO 2 levels (840, 1680, and 2520 ppm) and total carbon releases (3000, 4500, 7000, and 10000 GtC), we find that both the 840 ppm plus 7000 GtC and 1680 ppm plus 7000–10000 GtC scenarios agree best with temperature reconstructions. Bottom waters outside the Arctic and North Atlantic Oceans remain well oxygenated in all of our simulations. While the recovery time and rates are highly dependent on ocean alkalinity and sediment cover, the maximum temperature anomaly, used here to constrain the amount of carbon released, is less dependent on this slow acting feedback.
    Print ISSN: 0883-8305
    Electronic ISSN: 1944-9186
    Topics: Geosciences
    Published by Wiley on behalf of American Geophysical Union (AGU).
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Earth science: Volcanic cause of catastrophe (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-07-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bralower, Timothy J -- England -- Nature. 2008 Jul 17;454(7202):285-7. doi: 10.1038/454285a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18633405" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon Dioxide/metabolism ; Caribbean Region ; Extinction, Biological ; Greenhouse Effect ; Oceans and Seas ; Oxygen/metabolism ; Phytoplankton/metabolism ; Seawater/chemistry ; *Volcanic Eruptions
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    A transient rise in tropical sea surface temperature during the Paleocene-Eocene thermal maximum (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-10-25
    Description: The Paleocene-Eocene Thermal Maximum (PETM) has been attributed to a rapid rise in greenhouse gas levels. If so, warming should have occurred at all latitudes, although amplified toward the poles. Existing records reveal an increase in high-latitude sea surface temperatures (SSTs) (8 degrees to 10 degrees C) and in bottom water temperatures (4 degrees to 5 degrees C). To date, however, the character of the tropical SST response during this event remains unconstrained. Here we address this deficiency by using paired oxygen isotope and minor element (magnesium/calcium) ratios of planktonic foraminifera from a tropical Pacific core to estimate changes in SST. Using mixed-layer foraminifera, we found that the combined proxies imply a 4 degrees to 5 degrees C rise in Pacific SST during the PETM. These results would necessitate a rise in atmospheric pCO2 to levels three to four times as high as those estimated for the late Paleocene.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zachos, James C -- Wara, Michael W -- Bohaty, Steven -- Delaney, Margaret L -- Petrizzo, Maria Rose -- Brill, Amanda -- Bralower, Timothy J -- Premoli-Silva, Isabella -- New York, N.Y. -- Science. 2003 Nov 28;302(5650):1551-4. Epub 2003 Oct 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Earth and Ocean Sciences Departments, University of California, Santa Cruz, CA 95064, USA. jzachos@es.ucsc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14576441" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Nannoplankton extinction and origination across the Paleocene-Eocene Thermal Maximum (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: The Paleocene-Eocene Thermal Maximum (PETM, approximately 55 million years ago) was an interval of global warming and ocean acidification attributed to rapid release and oxidation of buried carbon. We show that the onset of the PETM coincided with a prominent increase in the origination and extinction of calcareous phytoplankton. Yet major perturbation of the surface-water saturation state across the PETM was not detrimental to the survival of most calcareous nannoplankton taxa and did not impart a calcification or ecological bias to the pattern of evolutionary turnover. Instead, the rate of environmental change appears to have driven turnover, preferentially affecting rare taxa living close to their viable limits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gibbs, Samantha J -- Bown, Paul R -- Sessa, Jocelyn A -- Bralower, Timothy J -- Wilson, Paul A -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1770-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Ocean and Earth Sciences, National Oceanography Centre, Southampton, European Way, Southampton, SO14 3ZH, UK. sxg@noc.soton.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170303" target="_blank"〉PubMed〈/a〉
    Keywords: Atmosphere ; Biodiversity ; Biological Evolution ; Calcification, Physiologic ; Carbon Dioxide ; *Ecosystem ; Environment ; *Extinction, Biological ; *Fossils ; Geologic Sediments ; New Jersey ; Oceans and Seas ; Pacific Ocean ; *Phytoplankton/classification ; *Plankton/classification ; Rivers ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    The Chicxulub asteroid impact and mass extinction at the Cretaceous-Paleogene boundary (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-03-06
    Description: The Cretaceous-Paleogene boundary approximately 65.5 million years ago marks one of the three largest mass extinctions in the past 500 million years. The extinction event coincided with a large asteroid impact at Chicxulub, Mexico, and occurred within the time of Deccan flood basalt volcanism in India. Here, we synthesize records of the global stratigraphy across this boundary to assess the proposed causes of the mass extinction. Notably, a single ejecta-rich deposit compositionally linked to the Chicxulub impact is globally distributed at the Cretaceous-Paleogene boundary. The temporal match between the ejecta layer and the onset of the extinctions and the agreement of ecological patterns in the fossil record with modeled environmental perturbations (for example, darkness and cooling) lead us to conclude that the Chicxulub impact triggered the mass extinction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schulte, Peter -- Alegret, Laia -- Arenillas, Ignacio -- Arz, Jose A -- Barton, Penny J -- Bown, Paul R -- Bralower, Timothy J -- Christeson, Gail L -- Claeys, Philippe -- Cockell, Charles S -- Collins, Gareth S -- Deutsch, Alexander -- Goldin, Tamara J -- Goto, Kazuhisa -- Grajales-Nishimura, Jose M -- Grieve, Richard A F -- Gulick, Sean P S -- Johnson, Kirk R -- Kiessling, Wolfgang -- Koeberl, Christian -- Kring, David A -- MacLeod, Kenneth G -- Matsui, Takafumi -- Melosh, Jay -- Montanari, Alessandro -- Morgan, Joanna V -- Neal, Clive R -- Nichols, Douglas J -- Norris, Richard D -- Pierazzo, Elisabetta -- Ravizza, Greg -- Rebolledo-Vieyra, Mario -- Reimold, Wolf Uwe -- Robin, Eric -- Salge, Tobias -- Speijer, Robert P -- Sweet, Arthur R -- Urrutia-Fucugauchi, Jaime -- Vajda, Vivi -- Whalen, Michael T -- Willumsen, Pi S -- New York, N.Y. -- Science. 2010 Mar 5;327(5970):1214-8. doi: 10.1126/science.1177265.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉GeoZentrum Nordbayern, Universitat Erlangen-Nurnberg, Schlossgarten 5, D-91054 Erlangen, Germany. schulte@geol.uni-erlangen.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20203042" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Extinction, Biological ; *Fossils ; Geologic Sediments ; Mexico ; *Minor Planets
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Oceanwide Anoxia in the Early Aptian: ABSTRACT (1990)
    American Association of Petroleum Geologists
    Details
    Publication Date: 1990-01-01
    Print ISSN: 0149-1423
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by American Association of Petroleum Geologists
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Lower Cretaceous Nannofossil Stratigraphy of the Great Valley Sequence: ABSTRACT (1990)
    American Association of Petroleum Geologists
    Details
    Publication Date: 1990-01-01
    Print ISSN: 0149-1423
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by American Association of Petroleum Geologists
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    New age constraints for the Salamanca Formation and lower Rio Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations (2014)
    Geological Society of America (GSA)
    Details
    Publication Date: 2014-02-27
    Description: The Salamanca Formation of the San Jorge Basin (Patagonia, Argentina) preserves critical records of Southern Hemisphere Paleocene biotas, but its age remains poorly resolved, with estimates ranging from Late Cretaceous to middle Paleocene. We report a multi-disciplinary geochronologic study of the Salamanca Formation and overlying Río Chico Group in the western part of the basin. New constraints include (1) an 40 Ar/ 39 Ar age determination of 67.31 ± 0.55 Ma from a basalt flow underlying the Salamanca Formation, (2) micropaleontological results indicating an early Danian age for the base of the Salamanca Formation, (3) laser ablation HR-MC-ICP-MS (high resolution-multi collector-inductively coupled plasma-mass spectrometry) U-Pb ages and a high-resolution TIMS (thermal ionization mass spectrometry) age of 61.984 ± 0.041(0.074)[0.100] Ma for zircons from volcanic ash beds in the Peñas Coloradas Formation (Río Chico Group), and (4) paleomagnetic results indicating that the Salamanca Formation in this area is entirely of normal polarity, with reversals occurring in the Río Chico Group. Placing these new age constraints in the context of a sequence stratigraphic model for the basin, we correlate the Salamanca Formation in the study area to Chrons C29n and C28n, with the Banco Negro Inferior (BNI), a mature widespread fossiliferous paleosol unit at the top of the Salamanca Formation, corresponding to the top of Chron C28n. The diverse paleobotanical assemblages from this area are here assigned to C28n (64.67–63.49 Ma), ~2–3 million years older than previously thought, adding to growing evidence for rapid Southern Hemisphere floral recovery after the Cretaceous-Paleogene extinction. Important Peligran and " Carodnia " zone vertebrate fossil assemblages from coastal BNI and Peñas Coloradas exposures are likely older than previously thought and correlate to the early Torrejonian and early Tiffanian North American Land Mammal Ages, respectively.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Degradation of Internal Organic Matter is the Main Control on Pteropod Shell Dissolution After Death (2019)
    American Geophysical Union
    Details
    Publication Date: 2019-06-01
    Print ISSN: 0886-6236
    Electronic ISSN: 1944-9224
    Topics: Biology , Chemistry and Pharmacology , Geography , Geosciences , Physics
    Published by American Geophysical Union
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...