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Accelerated increases in global and Asian summer monsoon precipitation from future aerosol reductions

Wilcox, L. J., Liu, Z., Samset, B. H., Hawkins, E., Lund, M. T., Nordling, K., Undorf, S., Bollasina, M., Ekman, A. M. L., Krishnan, S., Merikanto, J. and Turner, A. G. (2020) Accelerated increases in global and Asian summer monsoon precipitation from future aerosol reductions. Atmospheric Chemistry and Physics Discussions. ISSN 1680-7375 (In Press)

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To link to this item DOI: 10.5194/acp-2019-1188

Abstract/Summary

There is large uncertainty in future aerosol emissions scenarios explored in the Shared Socioeconomic Pathways(SSPs), with plausible pathways spanning a range of possibilities from large global reductions in emissions to 2050 to mod-erate global increases over the same period. Diversity in emissions across the pathways is particularly large over Asia. Rapid anthropogenic aerosol and precursor emission reductions between the present day and the 2050s lead to enhanced increases inglobal and Asian summer monsoon precipitation relative to scenarios with weak air quality policies. However, the effects of aerosol reductions don’t persist in precipitation to the end of the 21st century, when response to greenhouse gases dominatesdifferences across the SSPs. The relative magnitude and spatial distribution of aerosol changes is particularly important for South Asian summer monsoon precipitation changes. Precipitation increases here are initially suppressed in SSPs 2-4.5 and5-8.5 relative to SSP 1-1.9 and 3-7.0 when the impact of East Asian emission decreases is counteracted by that due to continuedincreases in South Asian emissions.

Item Type:Article
Refereed:No
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > NCAS
Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:88827
Publisher:Copernicus Publications

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