Assessment of the vertical distribution of speciated aerosol absorption over South Asia using spaceborne LIDAR and ground-based observations

REMOTE SENSING OF ENVIRONMENT

卷:253

Article

Lakshmi, N. B.¹  Nair, Vijayakumar S.¹  Babu, S. Suresh¹ 

[1] Vikram Sarabhai Space Ctr, Space Phys Lab, Thiruvananthapuram, Kerala, India

关键词: Aerosol;    Radiative effect;    CALIPSO;    Mineral dust;    Heating rate;    Carbonaceous aerosols;   

DOI  :  10.1016/j.rse.2020.112164

来源: Elsevier

【 摘 要 】

Present study estimates the shortwave radiative effects of absorbing aerosols (dust and carbonaceous aerosols) over the Indian landmass using a synergy of spaceborne and ground-based observations. Vertical profiles of dust and total aerosols are estimated using the multi-year (2006-2017) observations from CALIOP (Cloud Aerosol Lidar with Orthogonal Polarization) over the Indian region. Pre-monsoon enhancement (March - -May) in aerosol loading over the Indian region is significantly contributed (similar to 56%) by the transported mineral dust at free tropospheric altitudes. Though, shortwave radiative effect due to dust in the atmosphere increases about three times from winter to pre-monsoon, at the top of the atmosphere (TOA) it causes cooling. Dust induced cooling reverses the positive radiative effect induced by non-dust aerosols at TOA over Indo-Gangetic Plains. Though the natural dust dominates the aerosol loading during pre-monsoon, anthropogenic dust contributes significantly (similar to 65%) to the total dust loading during winter. Over Indo-Gangetic Plains, high aerosol warming (up to similar to 2 Kday(-1)) observed within the planetary boundary layer (PBL) is mainly caused by carbonaceous aerosols (85%). The observed heating rates over the Indian region can have significant implications over regional climate, air quality, and changing precipitation patterns.

【 授权许可】

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