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On the build-up of dust aerosols and possible indirect effect during Indian summer monsoon break spells using recent satellite observations of aerosols and cloud properties
- Source :
- Journal of Earth System Science. 130
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Association of higher (lower) rainfall with lower (higher) Aerosol Optical Depth (AOD) is consistent with the understanding that increased washout (build-up) and shorter (longer) life-time of aerosols occur in wetter (drier) conditions. Given the life-time of aerosols, it is imperative to examine how aerosols impact active/break (wetter/drier than normal) spells, prominent intraseasonal variability (ISV) of Indian summer monsoon (ISM), through their composite analysis using recent satellite observations of aerosols and cloud properties, circulation and rainfall. Dust aerosols can act as CCN and participate efficiently in cloud processes during active phase. During breaks, build-up of desert dust transported by prevalent circulation, is associated with lower cloud effective radius implying aerosols’ indirect effect where they can inhibit cloud growth in the presence of reduced moisture and decrease precipitation efficiency/rainfall. Correspondingly, correlation albeit small, between intraseasonal anomalies of AOD and rainfall is negative, when AOD leads rainfall by 3–5 days implying that indirect aerosols impact is effective during breaks, though it is not the dominant responsible factor. During breaks, lower shortwave flux at top of atmosphere hints at dust-induced semi-direct effect. As breaks are permanent features of ISM, incorporation of dust-induced feedbacks in models, is essential for improved ISV simulation and ISM prediction.
- Subjects :
- Effective radius
010504 meteorology & atmospheric sciences
Moisture
Flux
010502 geochemistry & geophysics
Atmospheric sciences
complex mixtures
01 natural sciences
Atmosphere
Washout (aeronautics)
General Earth and Planetary Sciences
Environmental science
Satellite
Precipitation
Shortwave
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 0973774X and 23474327
- Volume :
- 130
- Database :
- OpenAIRE
- Journal :
- Journal of Earth System Science
- Accession number :
- edsair.doi...........afac1a09f6ed5f3d301aadcc16ae0334