Details:

Personal Author:
Li, Xiaoqiong ; Ting, Mingfang ; You, Yujia ; Lee, Dong-Eun ; Westervelt, Daniel M. ; ... More +
Li, Xiaoqiong ; Ting, Mingfang ; You, Yujia ; Lee, Dong-Eun ; Westervelt, Daniel M. ; Ming, Yi ; Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ;
OAR (Oceanic and Atmospheric Research) ; GFDL (Geophysical Fluid Dynamics Laboratory) ; Less -
Description:
Climate models suggest that anthropogenic aerosol‐induced drying dominates the historical rainfall changes over the heavily populated South Asian monsoon region. The regional response depends on both the aerosol fast radiative effect and the slow process through sea surface temperature (SST) cooling. Two atmospheric general circulation models, NCAR‐CAM5 and GFDL‐AM3, are used to investigate the monsoon response to prescribed aerosol‐forced SSTs. The total SST is separated into uniform cooling and a spatially varying component characterized by interhemispheric asymmetry. The monsoon rainfall is predominantly controlled by the nonuniform SSTs, in the local Indian Ocean, South, and East China Seas (IO‐CSs). The reduced meridional SST gradient in the IO‐CSs leads to weakened monsoon circulation, which drives a north‐south dipole rainfall change. The latitudinal location of the dipole shows model dependence due to differences in local SSTs and their meridional gradient, which determines the latitudinal location of the meridional overturning circulation responses.
Keywords:
[+]
Aerosols
Climatology
Monsoons
Rain And Rainfall
Sea surface temperatures

Source:
Geophysical Research Letters 47(1): e2019GL085329, 2020
DOI:
https://doi.org/10.1029/2019GL085329
Document Type:
Journal Article ;
Place as Subject:
South Asia ;
Rights Information:
Other
Main Document Checksum:
[+]
urn:sha256:511e48eb7985125264a5eef46686b0e774e01631f951952dc80378eb1ad0de99
File Type:

Supporting Files

• No Additional Files

More +