Tectonic and climatic drivers of Asian monsoon evolution.

Tectonic and climatic drivers of Asian monsoon evolution.
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DOI:
10.1038/s41467-021-24244-z
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发表时间:
2021-06-29
影响因子:
16.6
通讯作者:
Harris NBW
Harris NBW
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Thomson JR;Holden PB;Anand P;Edwards NR;Porchier CA;Harris NBW

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Asian Monsoon rainfall supports the livelihood of billions of people, yet the relative importance of different drivers remains an issue of great debate. Here, we present 30 million-year model-based reconstructions of Indian summer monsoon and South East Asian monsoon rainfall at millennial resolution. We show that precession is the dominant direct driver of orbital variability, although variability on obliquity timescales is driven through the ice sheets. Orographic development dominated the evolution of the South East Asian monsoon, but Indian summer monsoon evolution involved a complex mix of contributions from orography (39%), precession (25%), atmospheric CO2 (21%), ice-sheet state (5%) and ocean gateways (5%). Prior to 15 Ma, the Indian summer monsoon was broadly stable, albeit with substantial orbital variability. From 15 Ma to 5 Ma, strengthening was driven by a combination of orography and glaciation, while closure of the Panama gateway provided the prerequisite for the modern Indian summer monsoon state through a strengthened Atlantic meridional overturning circulation. The drivers of monsoon systems in the past are not well known. Here, the authors present a model-based reconstruction of the last 30 million years and show that the south east Asian monsoon evolution is dominated by orographic development while the strength of the Indian Summer monsoon is controlled by a combination of factors.
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