Shan Sun, Rainer Bleck (NASA/GISS), and Manvendra Dubey (Los Alamos)
A global climate model consisting of the GISS atmospheric model and the HYCOM ocean model is used to study the impact of increasing Indian aerosols on local and global climate. An ensemble of perturbation runs branching off a control run based on 1990 atmospheric aerosol levels are carried out in which black and organic carbon over India and the northern Indian Ocean are jointly tripled. Changes in surface temperature, precipitation, and tropospheric circulation in different seasons are assessed as to their robustness across ensemble runs. A rather robust far-field response to the aerosol perturbation is summertime warming combined with wintertime cooling over European Russia. The ocean response is clouded by pentadal-to-decadal variability modes.