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Role of Asian summer monsoon subsystems in the inter-hemispheric progression of deglaciation

Nilsson-Kerr, K.; Anand, P.; Sexton, P. F.; Leng, M. J.; Misra, S.; Clemens, S. C. and Hammond, S. J. (2019). Role of Asian summer monsoon subsystems in the inter-hemispheric progression of deglaciation. Nature Geoscience, 12 pp. 290–295.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1038/s41561-019-0319-5
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Abstract

The responses of Asian monsoon subsystems to both hemispheric climate forcing and external orbital forcing are currently issues of vigorous debate. The Indian summer monsoon is the dominant monsoon subsystem in terms of energy flux, constituting one of Earth’s most dynamic expressions of ocean–atmosphere interactions. Yet, the Indian summer monsoon is grossly under-represented in Asian monsoon palaeoclimate records. Here, we present high-resolution records of Indian summer monsoon- induced rainfall and fluvial runoff recovered in a sediment core from the Bay of Bengal across Termination II, 139–127 thousand years ago, including coupled measurements of the oxygen isotopic composition and Mg/Ca, Mn/Ca, Nd/Ca and U/Ca ratios in surface-ocean-dwelling foraminifera. Our data reveal a millennial-scale transient strengthening of the Asian monsoon that punctuates Termination II associated with an oscillation of the bipolar seesaw. The progression of deglacial warming across Termination II emerges first in the Southern Hemisphere, then the tropics in tandem with Indian summer monsoon strengthening, and finally the Northern Hemisphere. We therefore suggest that the Indian summer monsoon was a conduit for conveying Southern Hemisphere latent heat northwards, thereby promoting subsequent Northern Hemisphere deglaciation.

Item Type: Journal Item
Copyright Holders: 2019 The Authors, under exclusive licence to Springer Nature Limited
ISSN: 1752-0908
Project Funding Details:
Funded Project NameProject IDFunding Body
Reconstruction of changes in Indian Summer Monsoon precipitationNot SetNERC (Natural Environment Research Council)
Keywords: Indian Summer Monsoon; Palaeoclimate; proxies; foraminifera; rainfall; runoff
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Item ID: 59824
Depositing User: Pallavi Anand
Date Deposited: 21 Mar 2019 12:22
Last Modified: 12 Apr 2019 08:14
URI: http://oro.open.ac.uk/id/eprint/59824
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