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Full-Text Articles in Physical Sciences and Mathematics
Temporal Trends In West Antarctic Accumulation Rates: Evidence From Observed And Simulated Records, Landon Kelly Burgener
Temporal Trends In West Antarctic Accumulation Rates: Evidence From Observed And Simulated Records, Landon Kelly Burgener
Theses and Dissertations
Reconstructed snow accumulation rate observations from five new firn cores show a statistically significant negative trend in accumulation rates over the past four decades across the central West Antarctic ice sheet. A negative temporal trend in accumulation is unexpected in light of rising surface temperatures and simulations run by GCMs. Both the magnitude of the mean accumulation rates and the range of interannual variability observed in the new records compares favorably to older records, suggesting that the new accumulation rate records may serve as a regional proxy for recent temporal trends in West Antarctic accumulation rates. The observed negative trend …
Chronostratigraphic Framework For The Iodp Expedition 318 Cores From The Wilkes Land Margin: Constraints For Paleoceanographic Reconstruction, Lisa Tauxe, Catherine E. Stickley, Saiko Sugisaki, Peter K. Bijl, Steven M. Bohaty, Henk Brinkhuis, Carlota Escutia, J. A. Flores, A. J. P. Houben, M. Iwai, Francisco J. Jiménez‐Espejo, Robert Mckay, Sandra Passchier, Jörg Pross, Christina Riesselman, Ursula Röhl, Francesca Sangiorgi, Kevin Welsh, Adam Klaus, Annick Fehr, James Bendle, Robert B. Dunbar, J. Gonzàlez, T. Hayden, K. Katsuki, M. P. Olney, Stephen Pekar, P. K. Shrivastava, Tina Van De Flierdt, Trevor Williams, M. Yamane
Chronostratigraphic Framework For The Iodp Expedition 318 Cores From The Wilkes Land Margin: Constraints For Paleoceanographic Reconstruction, Lisa Tauxe, Catherine E. Stickley, Saiko Sugisaki, Peter K. Bijl, Steven M. Bohaty, Henk Brinkhuis, Carlota Escutia, J. A. Flores, A. J. P. Houben, M. Iwai, Francisco J. Jiménez‐Espejo, Robert Mckay, Sandra Passchier, Jörg Pross, Christina Riesselman, Ursula Röhl, Francesca Sangiorgi, Kevin Welsh, Adam Klaus, Annick Fehr, James Bendle, Robert B. Dunbar, J. Gonzàlez, T. Hayden, K. Katsuki, M. P. Olney, Stephen Pekar, P. K. Shrivastava, Tina Van De Flierdt, Trevor Williams, M. Yamane
Department of Earth and Environmental Studies Faculty Scholarship and Creative Works
[1] The Integrated Ocean Drilling Program Expedition 318 to the Wilkes Land margin of Antarctica recovered a sedimentary succession ranging in age from lower Eocene to the Holocene. Excellent stratigraphic control is key to understanding the timing of paleoceanographic events through critical climate intervals. Drill sites recovered the lower and middle Eocene, nearly the entire Oligocene, the Miocene from about 17 Ma, the entire Pliocene and much of the Pleistocene. The paleomagnetic properties are generally suitable for magnetostratigraphic interpretation, with well‐behaved demagnetization diagrams, uniform distribution of declinations, and a clear separation into two inclination modes. Although the sequences were discontinuously …
A Paleoclimate Modeling Experiment To Calculate The Soil Carbon Respiration Flux For The Paleocene-Eocene Thermal Maximum, David M. Tracy
A Paleoclimate Modeling Experiment To Calculate The Soil Carbon Respiration Flux For The Paleocene-Eocene Thermal Maximum, David M. Tracy
Masters Theses 1911 - February 2014
The Paleocene-Eocene Thermal Maximum (PETM) (55 million years ago) stands as the largest in a series of extreme warming (hyperthermal) climatic events, which are analogous to the modern day increase in greenhouse gas concentrations. Orbitally triggered (Lourens et al., 2005, Galeotti et al., 2010), the PETM is marked by a large (-3‰) carbon isotope excursion (CIE). Hypothesized to be methane driven, Zeebe et al., (2009) noted that a methane based release would only account for 3.5°C of warming. An isotopically heavier carbon, such as that of soil and C3 plants, has the potential to account for the …
Evolution With Depth From Detrital To Authigenic Smectites In Sediments From And-2a Drill Core (Mcmurdo Sound, Antarctica), Francesco Iacoviello, Giovanna Giorgetti, Fernando Nieto, Isabella Turbanti Memmi
Evolution With Depth From Detrital To Authigenic Smectites In Sediments From And-2a Drill Core (Mcmurdo Sound, Antarctica), Francesco Iacoviello, Giovanna Giorgetti, Fernando Nieto, Isabella Turbanti Memmi
ANDRILL Research and Publications
We have examined the nature and origin of smectites in glaciomarine sediments of the AND-2A drill core (McMurdo Sound, Antarctica) by means of X-ray diffraction (XRD) analyses on the clay fraction, field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM) observations and SEM-EDS microanalyses on smectite particles. Relying on the smectite variation throughout the drill core it was possible to split the sequence into three units. Smectites throughout the core are either detrital or authigenic. Detrital smectites are close to montmorillonite-beidellite in composition while newly-formed smectites frequently have higher Fe-Mg contents and intermediate compositions between the saponite and nontronite …