Last deglaciation in the Okinawa Trough : subtropical northwest Pacific link to Northern Hemisphere and tropical climate
Last deglaciation in the Okinawa Trough : subtropical northwest Pacific link to Northern Hemisphere and tropical climate
Date
2005-06-23
Authors
Sun, Youbin
Oppo, Delia W.
Xiang, Rong
Liu, Weiguo
Gao, Shu
Oppo, Delia W.
Xiang, Rong
Liu, Weiguo
Gao, Shu
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DOI
10.1029/2004PA001061
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Keywords
Okinawa Trough
Deglaciation
Holocene
Kuroshio Current
East Asian monsoon
Mg/Ca
Oxygen isotopes
Foraminifera
Deglaciation
Holocene
Kuroshio Current
East Asian monsoon
Mg/Ca
Oxygen isotopes
Foraminifera
Abstract
Detailed deglacial and Holocene records of planktonic δ18O and Mg/Ca–based sea surface temperature (SST) from the Okinawa Trough suggest that at ∼18 to 17 thousand years before present (kyr B.P.), late spring/early summer SSTs were approximately 3°C cooler than today, while surface waters were up to 1 practical salinity unit saltier. These conditions are consistent with a weaker influence of the summer East Asian Monsoon (EAM) than today. The timing of suborbital SST oscillations suggests a close link with abrupt changes in the EAM and North Atlantic climate. A tropical influence, however, may have resulted in subtle decoupling between the North Atlantic and the Okinawa Trough/EAM during the deglaciation. Okinawa Trough surface water trends in the Holocene are consistent with model simulations of an inland shift of intense EAM precipitation during the middle Holocene. Millennial-scale alternations between relatively warm, salty conditions and relatively cold, fresh conditions suggest varying influence of the Kuroshio during the Holocene.
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Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Paleoceanography 20 (2005): PA4005, doi:10.1029/2004PA001061.
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Paleoceanography 20 (2005): PA4005