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首页> 外文期刊>Geophysical Research Letters >Mid-Brunhes strengthening of the Indian Ocean Dipole caused increased equatorial East African and decreased Australasian rainfall
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Mid-Brunhes strengthening of the Indian Ocean Dipole caused increased equatorial East African and decreased Australasian rainfall

机译：印度洋偶极子的早中期增强导致赤道东非增加，澳大利亚降水减少

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摘要

The tropical Indian Ocean is an important component of the largest warm pool, marked by changes in sea surface temperatures and depths of thermocline and mixed layer in its western and eastern extremities leading to the development of a dipole mode - the Indian Ocean Dipole (IOD). A narrow band of westerlies (7°N to 7°S) sweep the equatorial Indian Ocean during the April–May and October–November transitions between the summer- and winter-monsoon seasons. These Indian Ocean equatorial westerlies (IEW) are closely related to the IOD, intensifying the upper ocean Eastward Equatorial current also known as Wyrtki jets. The strength of the IOD/IEW determines the moisture content in East Africa. A major decrease in the strength of the IEW (strengthening or positive mode of the IOD) during the mid-Brunhes epoch (～300-250 Kyr BP) coincides with a wetter equatorial East Africa, a drier Australasia and a stronger Indian summer monsoon, indicating that the IOD/IEW play a significant role in driving climate change in East Africa, Australasia and South Asia.
机译：热带印度洋是最大暖池的重要组成部分，其特征是海面温度的变化以及其西，东端的跃层和混合层的深度，从而导致了偶极子模式的发展-印度洋偶极子（IOD） 。在夏季和冬季季风季节之间的四月至五月和十月至十一月的过渡期间，一小段西风（南纬7至南纬7°）席卷赤道印度洋。这些印度洋赤道西风（IEW）与IOD密切相关，加剧了上层洋向东赤道洋流，也称为Wyrtki急流。 IOD / IEW的强度决定了东非的水分含量。在中布鲁期（〜300-250 Kyr BP）期间，IEW强度（IOD的增强或正向模式）的大幅下降与赤道东非湿润，大洋洲干燥和印度夏季风增强有关，表明IOD / IEW在推动东非，大洋洲和南亚的气候变化方面发挥了重要作用。

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