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    Last deglaciation in the Okinawa Trough : subtropical northwest Pacific link to Northern Hemisphere and tropical climate

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    2004PA001061.pdf (540.8Kb)
    Date
    2005-06-23
    Author
    Sun, Youbin  Concept link
    Oppo, Delia W.  Concept link
    Xiang, Rong  Concept link
    Liu, Weiguo  Concept link
    Gao, Shu  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/293
    As published
    https://doi.org/10.1029/2004PA001061
    DOI
    10.1029/2004PA001061
    Keyword
     Okinawa Trough; 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.
    Description
    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.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Paleoceanography 20 (2005): PA4005
     

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