Impact of orbitally-driven seasonal insolation changes on Afro-Asian summer monsoons through the Holocene

Understanding what drives a shift of the Afro–Asian summer monsoons from the continents to oceanic regions provides valuable insight into climate dynamics, changes, and modeling. Here we use data–model synthesis to focus on the differential seasonal responses of solar insolation and monsoons to orbi...

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Bibliographic Details
Published in:Communications earth & environment 2021-01, Vol.2 (1), Article 4
Main Authors: Wu, Chi-Hua, Tsai, Pei-Chia
Format: Article
Language:English
Subjects:
704/106/35/823
704/106/413
704/106/694/1108
Climate change
Climate models
Continents
Earth and Environmental Science
Earth Sciences
Environment
Evolution
Holocene
Insolation
Jet streams (meteorology)
Monsoons
Ocean models
Rainy season
Summer
Synthesis
Troposphere
Wind
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Summary:Understanding what drives a shift of the Afro–Asian summer monsoons from the continents to oceanic regions provides valuable insight into climate dynamics, changes, and modeling. Here we use data–model synthesis to focus on the differential seasonal responses of solar insolation and monsoons to orbital changes in the Holocene. We observe coordinated and stepwise seasonal evolution of summer monsoons across the mid-Holocene, suggesting the strengthening of the midlatitude jet stream as a bridge in the upper troposphere. Prior to the mid-Holocene, insolation had decreased considerably in early summer; the continental monsoons migrated southeastward, which corresponded to a more pronounced rainy season in coastal East Asia. In late summer, insolation did not decrease until the mid-Holocene. The continued weakening of the continental monsoons, combined with weakened insolation, rapidly enhanced the intrinsic dynamics over East Asia–Western North Pacific and accelerated a large-scale migration of the monsoon, suggesting orbital control of seasonal diversity. The seasonal evolution of the Afro-Asian monsoon system from the continents to oceanic regions has changed through the Holocene due to variation in seasonal insolation resulting from orbital forcing, according to a data-model synthesis.
ISSN:2662-4435
2662-4435
DOI:10.1038/s43247-020-00073-8