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Change in precipitation pattern over South Asia in response to the trends in regional warming and free-tropospheric aerosol loading.
Jana, Soumyajyoti; Gogoi, Mukunda M; Babu, S Suresh.
Afiliação
  • Jana S; Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram, 695 022, India.
  • Gogoi MM; Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram, 695 022, India. dr_mukunda@vssc.gov.in.
  • Babu SS; Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram, 695 022, India.
Sci Rep ; 14(1): 14528, 2024 Jun 24.
Article em En | MEDLINE | ID: mdl-38914618
ABSTRACT
Spatial and temporal shifts in rainfall patterns over South Asia and the adjoining Seas during the pre-monsoon season have been observed over the past 2 decades from 2000 to 2019. Aerosol particles suspended above the boundary layer are a contributing factor to these changes. These particles not only alter cloud characteristics, but also diminish the lapse rate, thereby suppressing convective activity, leading to precipitation anomalies. Over the past 2 decades, high-rainfall regions have experienced declining rainfall, while low-rainfall regions have received increased rainfall. Coinciding with notable anomalies in precipitation, contrasting trends in aerosol optical depth, particularly due to absorbing aerosols in the elevated regions of the atmosphere, are seen. Apart from aerosols, several factors are considered that are critical in modifying precipitation patterns over the study region, such as water vapor content, convective processes, and lower-level relative humidity. We observed a potential transport of excess water vapor by ambient circulation from the oceanic regions having reduced rain, such as Bay of Bengal and the Arabian Sea, to higher latitudes enabling precipitation anomaly at distant locations.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Sci Rep Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Índia

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Sci Rep Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Índia