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Response of the East Asian Summer Monsoon to Atmospheric CO_2 Forcing and Subsequent Sea Surface Warming

Chen, Jinqiang and Bordoni, Simona (2015) Response of the East Asian Summer Monsoon to Atmospheric CO_2 Forcing and Subsequent Sea Surface Warming. . (Submitted)

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The regional climate change of the East Asian summer monsoon (EASM) is investigated in the Coupled Model Intercomparison Project - Phase 5 (CMIP5) archive. In the greenhouse gas forced scenario, reduction of radiative cooling and increase in continental surface temperature occur much more rapidly than changes in sea surface temperatures (SSTs). Without changes in SSTs, the rainfall in the monsoon region decreases (increases) over ocean (land) in most models. On longer time scales, as SSTs increase, rainfall changes are opposite. The total response to atmospheric CO_2 forcing and subsequent SST warming is a large (modest) increase in rainfall over ocean (land) in the EASM region. Dynamic changes, in spite of significant contributions from the thermodynamic component, play an important role in setting up the spatial pattern of precipitation changes. Rainfall anomalies over East China are a direct consequence of local land-sea contrast, while changes in the larger-scale oceanic rainfall band are closely associated with the displacement of the larger-scale North Pacific Subtropical High (NPSH). Ad hoc numerical simulations with the AM2.1 general circulation model show that topography and SST patterns play an important role in rainfall changes in the EASM region.

Item Type:Report or Paper (Discussion Paper)
Additional Information:We use the NCAR Command Language (Version 6.1.2, to create the plots and analyze the data. The data analyses and simulations were conducted on the Caltech’s Division of Geological and Planetary Sciences high-performance computing cluster.
Record Number:CaltechAUTHORS:20151203-114044320
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62578
Deposited By: Tony Diaz
Deposited On:04 Dec 2015 17:19
Last Modified:04 Dec 2015 17:19

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