It would sure be helpful if they made clear what they were using as the
reference. Is the monsoon less than it would be without SRM as GHGs go
up, or is it less than it was in preindustrial times?
Mike MacCracken
On 8/29/24 8:29 AM, Geoengineering News wrote:
https://www.researchsquare.com/article/rs-4631758/v1
*Authors*
Simone Tilmes, Asutosh Acharya, Ewa Bednarz, Suvarna Fadnavis
*26 August 2024*
https://doi.org/10.21203/rs.3.rs-4631758/v1
*Abstract*
The South Asian summer monsoon (SAM) bears significant importance for
agriculture, water resources, economy, and environmental aspects of
the region for more than 1.5 billion people. To minimize the adverse
impacts of global warming, Stratospheric Aerosol Intervention (SAI)
has been proposed to lower surface temperatures by reflecting a
portion of solar radiation back into space. However, the effects of
SAI on SAM are still very uncertain and demand more research. We
investigate this using the Stratospheric Aerosol Geoengineering Large
Ensemble datasets. Our study reveals a reduction in the mean and
extreme summer monsoon precipitation under SAI in this scenario,
driven by a combination of the SAI-induced lower stratospheric warming
and the associated weakening of the northern hemispheric subtropical
jet, changes in the upper-tropospheric wave activities, geopotential
height anomalies, and the strength of the Asian Summer Monsoon
Anticyclone. Local dust changes that can otherwise be important for
SAM rainfall variability under climate change also contribute to
changes under SAI. As the interest in SAI research grows, our results
demonstrate the urgent need to understand SAM variability under
different SAI scenarios, which is essential for sustainable
development and disaster preparedness in South Asia.
*Source: Research Square*
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