Enhanced Arabian Sea intermediate water flow during glacial North Atlantic cold phases
Enhanced Arabian Sea intermediate water flow during glacial North Atlantic cold phases
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DOI：
10.1016/j.epsl.2009.01.037
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发表时间：
2009-04-15
影响因子：
5.3
通讯作者：
Ganeshram, Raja
中科院分区：
文献类型：
--
作者：
Jung, Simon J. A.;Kroon, Dick;Ganeshram, Raja
在末次冰河期，极地冰芯表明两极之间在千年时间尺度上的气候异步。然而，全球大部分地区的表层海洋环流随格陵兰岛温度波动而变化，这表明任何反相行为在很大程度上都必须存在于更深的全球海洋环流中，而人们对大西洋以外的地区知之甚少。在这里，我们提供了来自印度洋西北部的数据，这些数据表明，南极中层水冰川（GAAIW）向北延伸的最大值的时间与与海因里希冰涌事件（HE）相关的北大西洋温盐翻转急剧减少的时间相一致。在阿拉伯海赤道以北地区记录到的HE期间GAAIW的反复扩张表明，南半球驱动的中间水团变化构成了千年时间尺度上半球间异步气候变化行为的一个组成部分。皇冠版权所有 (C) 2009 由 Elsevier B.V. 出版。保留所有权利。
During the last glacial period, polar ice cores indicate climate asynchrony between the poles at the millennial time-scale. Yet, surface ocean circulation in large parts of the globe varied in tune with Greenland temperature fluctuations suggesting that any anti-phase behavior to a substantial degree must lie in the deeper global ocean circulation which is poorly understood outside the Atlantic Ocean. Here we present data from the north-western Indian Ocean which indicate that the timing of maxima in northward extensions of glacial Antarctic Intermediate Water (GAAIW) coincides with dramatically reduced thermohaline overturn in the North Atlantic associated with the Heinrich-ice Surge events (HE). The repeated expansion of the GAAIW during HEs, recorded far north of the equator in the Arabian Sea, suggests that southern hemisphere driven intermediate water mass variability forms an integral part of the inter-hemisphere asynchronous climate change behavior at the millennial time-scale. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.