Millennial-scale dynamics of the winter cold tongue in the southern South China Sea over the past 26 ka and the East Asian winter monsoon
Millennial-scale dynamics of the winter cold tongue in the southern South China Sea over the past 26 ka and the East Asian winter monsoon
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近26ka南海南部冬季冷舌千年尺度动态与东亚冬季风
DOI：
10.1016/j.yqres.2010.08.014
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发表时间：
2011-01-01
影响因子：
2.3
通讯作者：
Steinke, Stephan
中科院分区：
文献类型：
--
作者：
Huang, Enqing;Tian, Jun;Steinke, Stephan
东亚冬季风（EAWM）的千年尺度变化仍然难以捉摸，由于稀疏和有争议的重建。通过汇编各种基于烯酮的海表温度（SST）估计，我们发现南海南部（SCS）的东西SST梯度很好地记录了越南南部冬季“冷舌”的时间动态，并推断了过去26 ka EAWM强度的变化。结果表明，在Heinrich事件1和新仙女木事件期间，南海南部冬季“冷舌”SST明显偏冷，导致东部西风带加强，南海南部SST自西向东梯度增大。在测年的不确定性，加强EAWM在冷stadials是coeval与大西洋纬向翻转环流（AMOC）的关闭或强度的降低，表现出很强的联系AMOC和EAWM系统之间。东西SST梯度也表明了增强EAWM在全新世早期，这可能是由冰后期冰盖动力学和强烈的季节性太阳辐射的对比。我们的研究结果表明，EAWM可能是由亚轨道时间尺度上的AMOC，太阳辐射和冰盖动力学之间的复杂的相互作用调制。(C)2010年华盛顿大学。爱思唯尔公司出版All rights reserved.
Millennial-scale variations of the East Asian winter monsoon (EAWM) remain elusive due to sparse and controversial reconstructions. By compiling a variety of alkenone-based sea surface temperature (SST) estimates, we find that the west-east SST gradient in the southern South China Sea (SCS) well documents the temporal dynamics of the winter "cold tongue" off the southern Vietnam and by inference, variations in the EAWM intensity over the past 26 ka. Our results reveal that the winter "cold tongue" SSTs were significantly colder during Heinrich event 1 and the Younger Dryas event, resulting in an increased west-east SST gradient in the southern SCS due to a strengthened EAWM. Within dating uncertainties, an intensified EAWM during cold stadials was coeval with the shutdown or a reduction in strength of the Atlantic meridional overturning circulation (AMOC), exhibiting a strong linkage between the AMOC and the EAWM system. The west-east SST gradient also indicates an enhanced EAWM during the early Holocene, which may be induced by postglacial ice-sheet dynamics and a strong seasonal contrast in solar insolation. Our findings suggest that the EAWM was probably modulated by a complex interplay between the AMOC, solar insolation and ice-sheet dynamics on sub-orbital time scales. (C) 2010 University of Washington. Published by Elsevier Inc. All rights reserved.