Past East Asian monsoon evolution controlled by paleogeography, not CO2

Alex Farnsworth, Daniel J. Lunt, Stuart A. Robinson, Paul J. Valdes, William Roberts, Peter D. Clift, Paul Markwick, Tao Su, Neil Wrobel, Fran Bragg, Sarah-Jane Kelland, Richard D. Pancost

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)
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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.
Original languageEnglish
Article numbereaax1697
JournalScience advances
Volume5
Issue number10
DOIs
Publication statusPublished - 30 Oct 2019

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