Characterizing ice sheets during the Pliocene; evidence from data and models

Author(s): Hill, D. J.; Haywood, A. M.; Hindmarsh, R. C. A.; Valdes, P. J.
Author Affiliation(s): Primary:
British Antarctic Survey, Geological Sciences Division, Cambridge, United Kingdom
Other:
University of Leeds, United Kingdom
PetroStrat, United Kingdom
University of Bristol, United Kingdom
Volume Title: Deep-time perspectives on climate change; marrying the signal from computer models and biological proxies
Volume Author(s): Williams, M., editor; Haywood, A. M.; Gregory, F. J.; Schmidt, D. N.
Source: Deep-time perspectives on climate change; marrying the signal from computer models and biological proxies, edited by M. Williams, A. M. Haywood, F. J. Gregory and D. N. Schmidt, p.517-538. Publisher: Geological Society of London, London, United Kingdom. ISBN: 978-1-86239-240-3
Note: In English. 165 refs.; illus., incl. 2 tables, sketch maps
Summary: The Pliocene (c. 5.3-1.8 Myr BP) was the last epoch of geological time in which global temperatures were generally higher than modern. It is important if we are to understand the dynamics of warm climates. This is particularly true of the interaction of climate and cryosphere, where the Pliocene may represent the first epoch in which ice sheets, at least on Antarctica, were a permanent feature. In this paper, we review the available evidence for the state of ice sheets during the Pliocene as well as previous attempts to model them. We then present new models and sensitivity studies of the mid-Pliocene East Antarctic Ice Sheet (EAIS) and consider the implications for the debate on ice-sheet stability during the Pliocene. These new reconstructions suggest that the mid-Pliocene EAIS was significantly smaller than modern, but the modelled average mid-Pliocene climate is not sufficient to cause the widespread deglaciation suggested by Sirius Group diatom evidence.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic ice sheet; Antarctica; Arctic Ocean; Atlantic Ocean; Cenozoic; East Antarctic ice sheet; Glacial geology; Glaciation; Ice sheets; Leg 105; Leg 151; Leg 152; Leg 162; Models; Neogene; North Atlantic; Norwegian Sea; ODP Site 642; ODP Site 645; ODP Site 646; ODP Site 907; ODP Site 910; ODP Site 911; ODP Site 918; ODP Site 986; Ocean Drilling Program; Paleoclimatology; Pliocene; Tertiary
Coordinates: N801553 N801553 E0063526 E0063526
N671312 N671330 E0025548 E0025542
N702730 N702730 W0643924 W0643924
N630534 N630534 W0383820 W0383820
Record ID: 2008114477
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