Past East Asian monsoon evolution controlled by paleogeography, not CO2

Farnsworth, Alex, Lunt, Daniel J., Robinson, Stuart A., Valdes, Paul J., Roberts, William, Clift, Peter D., Markwick, Paul, Su, Tao, Wrobel, Neil, Bragg, Fran, Kelland, Sarah-Jane and Pancost, Richard D. (2019) Past East Asian monsoon evolution controlled by paleogeography, not CO2. Science Advances, 5 (10). eaax1697. ISSN 2375-2548

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Official URL: https://doi.org/10.1126/sciadv.aax1697

Abstract

The East Asian monsoon plays an integral role in human society, yet its geological history and controlling processes are poorly understood. Using a general circulation model and geological data, we explore the drivers controlling the evolution of the monsoon system over the past 150 million years. In contrast to previous work, we find that the monsoon is controlled primarily by changes in paleogeography, with little influence from atmospheric CO2. We associate increased precipitation since the Late Cretaceous with the gradual uplift of the Himalayan-Tibetan region, transitioning from an ITCZ-dominated monsoon to a sea breeze–dominated monsoon. The rising region acted as a mechanical barrier to cold and dry continental air advecting into the region, leading to increasing influence of moist air from the Indian Ocean/South China Sea. We show that, apart from a dry period in the middle Cretaceous, a monsoon system has existed in East Asia since at least the Early Cretaceous.

Item Type: Article
Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Paul Burns
Date Deposited: 23 Oct 2019 13:59
Last Modified: 30 Jan 2020 03:31
URI: http://nrl.northumbria.ac.uk/id/eprint/40506

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