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    Dynamic millennial-scale climate changes in the northwestern Pacific over the past 40,000 years

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    Text S1: Text for core material, foraminifer isotopes, and age controls; Mg/Ca SST determination; change of wind, ocean circulation and SST after the reduction or shutdown of THC in a coupled model; the simulated Kuroshio in the present coupled climate models. (1.102Mb)
    Date
    2010-12-03
    Author
    Chen, Min-Te  Concept link
    Lin, Xiaopei  Concept link
    Chang, Yuan-Pin  Concept link
    Chen, Y.-C.  Concept link
    Lo, L.  Concept link
    Shen, Chuan-Chou  Concept link
    Yokoyama, Yusuke  Concept link
    Oppo, Delia W.  Concept link
    Thompson, William G.  Concept link
    Zhang, Rong  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4288
    As published
    https://doi.org/10.1029/2010GL045202
    DOI
    10.1029/2010GL045202
    Keyword
     Kuroshio; Pacific; Sea surface temperature; Mg/Ca; Oxygen isotope; East Asian monsoon 
    Abstract
    Ice core records of polar temperatures and greenhouse gases document abrupt millennial-scale oscillations that suggest the reduction or shutdown of thermohaline Circulation (THC) in the North Atlantic Ocean may induce the abrupt cooling in the northern hemisphere. It remains unknown, however, whether the sea surface temperature (SST) is cooling or warming in the Kuroshio of the Northwestern Pacific during the cooling event. Here we present an AMS 14C-dated foraminiferal Mg/Ca SST record from the central Okinawa Trough and document that the SST variations exhibit two steps of warming since 21 ka — at 14.7 ka and 12.8 ka, and a cooling (∼1.5°C) during the interval of the Younger Dryas. By contrast, we observed no SST change or oceanic warming (∼1.5–2°C) during the episodes of Northern Hemisphere cooling between ∼21–40 ka. We therefore suggest that the “Antarctic-like” timing and amplitude of millennial-scale SST variations in the subtropical Northwestern Pacific between 20–40 ka may have been determined by rapid ocean adjustment processes in response to abrupt wind stress and meridional temperature gradient changes in the North Pacific.
    Description
    Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 37 (2010): L23603, doi:10.1029/2010GL045202.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geophysical Research Letters 37 (2010): L23603
     

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