The monsoon is a large-scale feature of the tropical atmospheric circulation, affecting people and economies in the world's most densely populated regions. Future trends due to natural variability and human-induced climate changes are uncertain. Palaeoclimate records can improve our understanding of monsoon dynamics and thereby reduce this uncertainty. Palaeoclimate records have revealed a dramatic decrease in the Asian summer monsoon since the early Holocene maximum 9 ka BP. Here we focus on the last 2 ka, where some records indicate an increasing trend in the summer monsoon. Analysing Globigerina bulloides upwelling records from the Arabian Sea, we find the weakest monsoon occurred 1500 a BP, with an increasing trend towards the present.
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机译：季风是热带大气环流的大规模特征，影响着世界上人口最稠密地区的人民和经济。由于自然多变性和人为引起的气候变化，未来趋势尚不确定。古气候记录可以增进我们对季风动力学的了解，从而减少这种不确定性。古气候记录显示，自全新世早期最高9 ka BP以来，亚洲夏季风明显减少。在这里，我们主要关注最后2 ka，其中一些记录表明夏季风在增加。通过分析阿拉伯海的Globigerina Bulloides上升趋势记录，我们发现最弱的季风发生在1500 a BP，并且朝着现在的趋势呈上升趋势。
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