Local Insolation Drives Afro‐Asian Monsoon at Orbital‐Scale in Holocene

Local Insolation Drives Afro‐Asian Monsoon at Orbital‐Scale in Holocene
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全新世局部日照以轨道规模驱动非洲和亚洲季风

DOI:
10.1029/2021gl097661
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发表时间:
2022-03
影响因子:
5.2
通讯作者:
Yishuang Liang
Yishuang Liang
中科院分区:
地球科学1区
文献类型:
--
作者:
Qin Wen;Zhengyu Liu;Jiang Zhu;Mi Yan;Chengfei He;Jing Han;Jian Liu;Yishuang Liang

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日照变化在驱动轨道时间尺度的季风变化方面发挥着重要作用。仍然悬而未决的一个关键问题是,亚洲季风是由轨道带上来自北半球(NH)的局地日照还是来自南半球(SH)的远程日照驱动的。在这里,我们进行了一组敏感性实验,以量化局部和远程日照变化对 11 ka BP 相对于现在的亚非夏季风的影响。我们表明,亚非夏季风绝大多数是由热带-亚热带北半球进动引起的局部日照变化驱动的。北半球高纬度地区的日照也影响亚非夏季风。相比之下,SH 的日照作用可以忽略不计。我们的模型实验支持这样的观点,即亚非夏季风主要是由全新世北半球低纬度夏季日照的直接强迫驱动的。
Insolation changes play an important role in driving monsoon changes at orbital time scales. One key issue that has remained outstanding is whether the Asian monsoon is driven by local insolation from the Northern Hemisphere (NH) or remote insolation from the Southern Hemisphere (SH) at orbital band. Here, we perform a set of sensitivity experiments to quantify the impacts of local and remote insolation changes on the Afro‐Asian summer monsoon at 11 ka BP relative to the present. We show that the Afro‐Asian summer monsoon is overwhelmingly driven by the precession induced local insolation change in the tropical‐subtropical NH. The insolation from NH high latitudes also affects the Afro‐Asian summer monsoon. In contrast, the insolation from SH plays a negligible role. Our model experiments support the idea that the Afro‐Asian summer monsoon are driven predominantly by the direct forcing of NH low latitudes summer insolation for the Holocene.
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