Exploring causes of distinct regional and subseasonal Indian summer monsoon precipitation responses to CO2 removal

This study investigates the response of Indian summer monsoon (ISM) precipitation to CO 2 removal, with a specific focus on regional and subseasonal variations. Following CO 2 removal, monsoon circulation weakens throughout the summer owing to the reduced large-scale meridional temperature gradient...

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Bibliographic Details
Published in:NPJ climate and atmospheric science 2024-12, Vol.7 (1), p.305-12, Article 305
Main Authors: Paik, Seungmok, Kim, Daehyun, An, Soon-Il, Oh, Hyoeun, Shin, Jongsoo, Goswami, Bidyut Bikash, Min, Seung-Ki, Mondal, Sanjit Kumar
Format: Article
Language:English
Subjects:
21st century
704/106/35/823
704/106/694/2786
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Carbon dioxide
Carbon dioxide removal
Climate change
Climate Change/Climate Change Impacts
Climatology
Earth and Environmental Science
Earth Sciences
El Nino
Extreme values
Extreme weather
Global warming
Greenhouse gases
Hydroclimate
Low pressure
Monsoons
Precipitation
Simulation
Stability
Summer
Temperature gradients
Thermodynamics
Wind
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Summary:This study investigates the response of Indian summer monsoon (ISM) precipitation to CO 2 removal, with a specific focus on regional and subseasonal variations. Following CO 2 removal, monsoon circulation weakens throughout the summer owing to the reduced large-scale meridional temperature gradient around India. Weakened monsoon circulation decreases the local-scale thermodynamic stability within India, following monsoon-onset periods. While the frequency of synoptic-scale ISM low-pressure systems (LPSs) decreases overall, the lower thermodynamic stability causes the LPSs to form and resultantly shift west and south from their typical paths, last longer and move more quickly zonally during August and September. Changes in these rain-producing processes induce distinct regional (Western Ghats, south-central-east India, and Tamil Nadu) and subseasonal precipitation responses. Also, extreme precipitation exhibits similar patterns, but is more strongly affected by changes in LPS. Our results suggest that reliable future projections of regional hydroclimate change require a more accurate understanding of multi-scale precipitation processes.
ISSN:2397-3722
2397-3722
DOI:10.1038/s41612-024-00858-0