Journal
PALEOCEANOGRAPHY
Volume 19, Issue 4, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004PA001014
Keywords
ocean heat; transport; Paleogene oceans; Antarctic glaciation
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Near the Eocene's close (similar to34 million years ago), the climate system underwent one of the largest shifts in Earth's history: Antarctic terrestrial ice sheets suddenly grew and ocean productivity patterns changed. Previous studies conjectured that poleward penetration of warm, subtropical currents, the East Australian Current (EAC) in particular, caused Eocene Antarctic warmth. Late Eocene opening of an ocean gateway between Australia and Antarctica was conjectured to have disrupted the EAC, cooled Antarctica, and allowed ice sheets to develop. Here we reconstruct Eocene paleoceanographic circulation in the Tasmanian region, using (1) biogeographical distributions of phytoplankton, including data from recently drilled Ocean Drilling Program Leg 189 sites and (2) fully coupled climate model simulations. We find that the EAC did not penetrate to high latitudes and ocean heat transport in the region was not greater than modern. Our results do not support changes in thermal isolation'' as the primary driver of the Eocene-Oligocene climatic transition.
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