Exploring causes of distinct regional and subseasonal Indian summer monsoon precipitation responses to CO2 removal
Year: 2024
Type: article
Abstract: 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.
Institutions: Yonsei University, Seoul National University, University of Washington, Pohang University of Science and Technology, Institute for Basic Science, IBS Center for Climate Physics, Pusan National University, Woods Hole Oceanographic Institution, Institute of Science and Technology Austria
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
SDG: Climate action
Open Access status: gold
Estimated APC paid: $3,390
Funders: National Research Foundation, Seoul National University, Korea Meteorological Administration, National Research Foundation of Korea, Ministry of Science and ICT, South Korea, Korea Research Environment Open Network, National Supercomputing Center, Korea Institute of Science and Technology Information
OpenAlex ID: W4405580423