Abstract

This chapter presents seasonal variations of different aerosol subtypes observed at Anantapur in southern peninsular India. The study utilizes the data obtained from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) satellite during December 2008–November 2018. The intra-seasonal mean (±σ) columnar aerosol optical depth (AOD) was found to be 0.31 ± 0.1, 0.43 ± 0.1, 0.20 ± 0.04, and 0.25 ± 0.06 during winter, summer, monsoon, and postmonsoon, respectively. The results revealed that the dominant aerosol subtypes in winter was polluted continental (63.6%), whereas the polluted dust aerosol (69%) was found dominant in summer. Furthermore, the polluted continental and polluted dust was the dominant aerosol subtype during the postmonsoon, with frequencies of about 37.8% and 44.7%, respectively. These findings can be fairly consistent with the air mass cluster analysis computed for the obtained backward trajectories derived from the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model. Further, the aerosol vertical extinction coefficient measured at 532 nm was found larger at lower altitudes of <2 km (higher >2 km) during the winter and postmonsoon (summer and monsoon) seasons.

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