Glacial Indonesian Throughflow weakening across the Mid-Pleistocene Climatic Transition
Glacial Indonesian Throughflow weakening across the Mid-Pleistocene Climatic Transition
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DOI：
10.1038/s41598-019-53382-0
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发表时间：
2018-12
影响因子：
4.6
通讯作者：
B. Petrick;A. Martínez-García;G. Auer;L. Reuning;A. Auderset;H. Deik;H. Takayanagi;D. De Vleeschouwer;Y. Iryu;G. Haug
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作者：
B. Petrick;A. Martínez-García;G. Auer;L. Reuning;A. Auderset;H. Deik;H. Takayanagi;D. De Vleeschouwer;Y. Iryu;G. Haug
印度尼西亚通流（ITF）控制着太平洋和印度洋之间的海洋热盐通量，因此在调节经向翻转环流和低纬度水文循环中起着重要作用。在这里，我们报告了来自澳大利亚西海岸的新的海面温度和干旱记录（IODP站点U1460），这使我们能够评估东印度洋对中更新世过渡期间发生的地球气候重大重组的敏感性。我们的记录表明，155万年前和65万年前的冰川冷却，最好的解释是由于全球海平面和构造变化导致的ITF减弱。这与不同海洋盆地碳同位素组成的显著梯度的发展以及区域干旱的实质性变化相吻合，表明ITF的限制既影响了全球海洋环流的演变，也影响了西澳大利亚现代水文循环的发展。
The Indonesian Throughflow (ITF) controls the oceanic flux of heat and salt between the Pacific and Indian Oceans and therewith plays an important role in modulating the meridional overturning circulation and low latitude hydrological cycle. Here, we report new sea surface temperature and aridity records from the west coast of Australia (IODP Site U1460), which allow us to assess the sensitivity of the eastern Indian Ocean to the major reorganization of Earth’s climate that occurred during the Mid-Pleistocene Transition. Our records indicate glacial coolings at 1.55 and 0.65 million years ago that are best explained by a weakening of the ITF as a consequence of global sea level and tectonic changes. These coincide with the development of pronounced gradients in the carbon isotope composition of the different ocean basins and with substantial changes in regional aridity, suggesting that the restrictions of the ITF influenced both the evolution of global ocean circulation and the development of the modern hydrological cycle in Western Australia.