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New estimates of aerosol radiative effects over India from surface and satellite observations

Subba, T and Gogoi, MM and Moorthy, KK and Bhuyan, PK and Pathak, B and Guha, A and Srivastava, MK and Vyas, BM and Singh, K and Krishnan, J and Lakshmi Kumar, TV and Babu, SS (2022) New estimates of aerosol radiative effects over India from surface and satellite observations. In: Atmospheric Research, 276 .

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Official URL: https://doi.org/10.1016/j.atmosres.2022.106254


Multi-year measurements of surface-reaching solar (shortwave) radiation fluxes across a network of aerosol observatories (ARFINET) are combined with concurrent satellite (CERES)-based top of the atmosphere (TOA) fluxes to estimate regional aerosol direct radiative forcing (ARF) over the Indian region. The synergistic approach improves the accuracy of ARF estimates, which otherwise results in an overestimation or underestimation of the atmospheric forcing. During summer, an overestimation of ~5 W m−2 (corresponding heating rate ~ 0.15 K day−1) is noticed. The regional average ARF from the synergistic approach reveals the surface forcing reaching −49 W m−2 over the Indo Gangetic Plains, −45 W m−2 over northeast India, −34 W m−2 over the southern Peninsula, and − 16 W m−2 in the oceanic regions of the Bay of Bengal. The ARF over the northern half of the Indian subcontinent is influenced mainly by anthropogenic sulfate and carbonaceous aerosols. Dust is dominant in the western region of India during MAM and JJAS. Overall, the clear sky surface reaching solar radiation fluxes is reduced by 3–22% due to the abundance of aerosols in the atmosphere, with the highest reduction over the IGP during autumn and winter.

Item Type: Journal Article
Publication: Atmospheric Research
Publisher: Elsevier Ltd
Additional Information: The copyright for this article belongs to the Elsevier Ltd
Keywords: Aerosols; Atmospheric radiation; Radiation effects; Sulfur compounds, Aerosol composition; Aerosol direct radiative forcing; Aerosol radiative forcing; ARFINET; Combined with concurrent satellite; MERRA-2; Radiative effects; Satellite observations; Surface observation; SW-radiation, Heating rate
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Date Deposited: 15 Jun 2022 06:54
Last Modified: 15 Jun 2022 06:54
URI: https://eprints.iisc.ac.in/id/eprint/73567

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