Initiation of the West Antarctic Ice Sheet and estimates of total Antarctic ice volume in the earliest Oligocene
Autor: | Robert M. DeConto, Douglas S. Wilson, David Pollard, Bruce P. Luyendyk, Stewart S. R. Jamieson |
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Rok vydání: | 2013 |
Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Ice stream Antarctic ice sheet Antarctic sea ice 010502 geochemistry & geophysics 01 natural sciences Ice shelf Ice-sheet model Geophysics Oceanography 13. Climate action Sea ice General Earth and Planetary Sciences Cryosphere 14. Life underwater Ice sheet Geology 0105 earth and related environmental sciences |
Zdroj: | Geophysical Research Letters. 40:4305-4309 |
ISSN: | 0094-8276 |
DOI: | 10.1002/grl.50797 |
Popis: | [1] Reconstructions of Antarctic paleotopography for the late Eocene suggest that glacial erosion and thermal subsidence have lowered West Antarctic elevations considerably since then, with Antarctic land area having decreased ~20%. A new climate-ice sheet model based on these reconstructions shows that the West Antarctic Ice Sheet first formed at the Eocene-Oligocene transition (33.8–33.5Ma, E-O) in concert with the continental-scale expansion of the East Antarctica Ice Sheet and that the total volume of East and West Antarctic ice (33.4–35.9×10 6 km 3 )w as>1.4 times greater than previously assumed. This larger modeled ice volume is consistent with a modest cooling of 1–2°C in the deep ocean during the E-O transition, lower than other estimates of ~3°C cooling, and suggests the possibility of substantial ice in the Antarctic interior before the Eocene-Oligocene boundary. Citation: Wilson, D. S., D. Pollard, R. M. DeConto, S. S. R. Jamieson, and B. P. Luyendyk (2013), Initiation of the West Antarctic Ice Sheet and estimates of total Antarctic ice volume in the earliest Oligocene, Geophys. Res. Lett., 40, doi:10.1002/ grl.50797. |
Databáze: | OpenAIRE |
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