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Influence of the intertropical convergence zone on the East Asian monsoon

机译：热带辐合带对东亚季风的影响

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The Asian - Australian monsoon is an important component of the Earth's climate system that influences the societal and economic activity of roughly half the world's population. The past strength of the rain-bearing East Asian summer monsoon can be reconstructed with archives such as cave deposits(1-3), but the winter monsoon has no such signature in the hydrological cycle and has thus proved difficult to reconstruct. Here we present high-resolution records of the magnetic properties and the titanium content of the sediments of Lake Huguang Maar in coastal southeast China over the past 16,000 years, which we use as proxies for the strength of the winter monsoon winds. We find evidence for stronger winter monsoon winds before the Bolling - Allerod warming, during the Younger Dryas episode and during the middle and late Holocene, when cave stalagmites suggest weaker summer monsoons(1-3). We conclude that this anticorrelation is best explained by migrations in the intertropical convergence zone. Similar migrations of the intertropical convergence zone have been observed in Central America for the period AD 700 to 900 (refs 4 - 6), suggesting global climatic changes at that time. From the coincidence in timing, we suggest that these migrations in the tropical rain belt could have contributed to the declines of both the Tang dynasty in China and the Classic Maya in Central America.
机译：亚洲－澳大利亚季风是地球气候系统的重要组成部分，它影响着全球约一半人口的社会和经济活动。东亚夏季雨季的过去强度可以通过洞穴沉积物（1-3）等档案来重建，但冬季季风在水文循环中没有这种特征，因此难以重建。在这里，我们提供了过去16,000年中国东南沿海虎光湖（Huar Maar）湖的沉积物的磁学性质和钛含量的高分辨率记录，这些记录被用作冬季季风风强度的代理。我们发现有证据表明，在Bolling-Allerod变暖之前，更年轻的Dryas时期和全新世的中后期，冬季石笋表明较弱的夏季风（1-3）。我们得出结论，这种反相关性最好由热带辐合带中的偏移来解释。在中美洲，在公元700年至900年期间，热带气旋收敛带也发生了类似的迁移（参考文献4-6），这表明当时的全球气候变化。从时间上的巧合，我们认为热带雨带中的这些迁移可能导致了中国唐朝和中美洲经典玛雅人的衰落。

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