I am surprised that this post didn't get any replies. It seemed rather important to me because reduction in the Indian monsoon has always been one of the arguments against stratospheric aerosol. (Together with damage to the ozone layer) My answer has always been that the Indian monsoon has already reduced considerably over the last 30 years probably due to some aspect of global warming
The paper was quite difficult for a non climate scientist but the conclusion seems to be that global warming alone would probably increase the Indian monsoon but that industrial smog over Asia (aka tropospheric aerosol) disturbs the North-South circulation between the northern and southern hemispheres leading to a reduction.
An early solution to the industrial smog problem in Asia is probably as unlikely as an early reduction in CO2 emissions. So maybe global stratospheric aerosol plans should start by offering a solution to the problem of the Indian monsoon reduction as well as giving an overall reduction in global warming. Maybe the same climate models that produced this conclusion could be used to produce a suitable geoengineering plan.
Regards
John Gorman
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