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Modulation of Indian monsoon by water vapor and cloud feedback over the past 22,000 years

Jalihal, Chetankumar and Srinivasan, Jayaraman and Chakraborty, Arindam (2019) Modulation of Indian monsoon by water vapor and cloud feedback over the past 22,000 years. In: NATURE COMMUNICATIONS, 10 .

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Official URL: https://dx.doi.org/10.1038/s41467-019-13754-6

Abstract

To predict how monsoons will evolve in the 21st century, we need to understand how they have changed in the past. In paleoclimate literature, the major focus has been on the role of solar forcing on monsoons but not on the amplification by feedbacks internal to the climate system. Here we have used the results from a transient climate simulation to show that feedbacks amplify the effect of change in insolation on the Indian summer monsoon. We show that during the deglacial (22 ka to 10 ka) monsoons were predominantly influenced by rising water vapor due to increasing sea surface temperature, whereas in the Holocene (10 ka to 0 ka) cloud feedback was more important. These results are consistent with another transient simulation, thus increasing confidence despite potential model biases. We have demonstrated that insolation drives monsoon through different pathways during cold and warm periods, thereby highlighting the changing role of internal factors.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Keywords: ASIAN SUMMER MONSOON; NORTHERN-HEMISPHERE; CLIMATE-CHANGE; FORCING MECHANISMS; MODEL; RAINFALL; CO2; PRECIPITATION; TEMPERATURE; VARIABILITY
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Depositing User: Id for Latest eprints
Date Deposited: 10 Jan 2020 07:47
Last Modified: 10 Jan 2020 07:47
URI: http://eprints.iisc.ac.in/id/eprint/64287

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