Indian Ocean salinity build-up primes deglacial ocean circulation recovery
Indian Ocean salinity build-up primes deglacial ocean circulation recovery
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DOI：
10.1038/s41586-023-05866-3
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发表时间：
2023-05
期刊：
影响因子：
64.8
通讯作者：
S. Nuber;J. Rae;Xu Zhang;M. B. Andersen;Matthew D. Dumont;H. Mithan;Yuchen Sun;B. de Boer;I. Hall;S. Barker
中科院分区：
文献类型：
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作者：
S. Nuber;J. Rae;Xu Zhang;M. B. Andersen;Matthew D. Dumont;H. Mithan;Yuchen Sun;B. de Boer;I. Hall;S. Barker
印度洋通过Agulhas泄漏为北大西洋深水对流站点提供了盐的来源，因此可能会推动海洋翻转环流的变化。然而，很少有人知道的盐含量的变化，印度洋和Agulhas泄漏沃茨在过去的冰川周期，以及如何这可能会影响流通。在这里，我们表明，冰川印度洋表面盐预算是显着不同的现代，动态响应海平面的变化。印度洋表面盐度在冰川加剧期间增加，在冰川极大期达到峰值。我们发现，这是由于冰川海平面下降引起的印尼群岛的快速土地曝光，我们建议通过减少输入相对新鲜的印尼水流沃茨进入印度洋的机械联系。使用气候模型的结果，我们表明，通过Agulhas泄漏在冰消期间释放的冰川印度洋盐度可以直接影响大西洋经向翻转环流和全球气候。
The Indian Ocean provides a source of salt for North Atlantic deep-water convection sites, via the Agulhas Leakage, and may thus drive changes in the ocean’s overturning circulation, –. However, little is known about the salt content variability of Indian Ocean and Agulhas Leakage waters during past glacial cycles and how this may influence circulation. Here we show that the glacial Indian Ocean surface salt budget was notably different from the modern, responding dynamically to changes in sea level. Indian Ocean surface salinity increased during glacial intensification, peaking in glacial maxima. We find that this is due to rapid land exposure in the Indonesian archipelago induced by glacial sea-level lowering, and we suggest a mechanistic link via reduced input of relatively fresh Indonesian Throughflow waters into the Indian Ocean. Using climate model results, we show that the release of this glacial Indian Ocean salinity via the Agulhas Leakage during deglaciation can directly impact the Atlantic Meridional Overturning Circulation and global climate.