Aerosol Opto-physical Properties: Temporal Variation, Aerosol Type Discrimination and Source Identification

Aerosol Opto-physical Properties: Temporal Variation, Aerosol Type Discrimination and Source Identification

Abstract Atmospheric aerosol characterization experiments were conducted, for the first time, over AC-Ahmednagar, a semi-urban location in south-west India, using a multi-spectral solar radiometer from January 2016 to May 2018. The MODIS/Terra retrieved Level-2 daily swath AOD550 nm data sets during...

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Main Authors: Amol R. Kolhe, Gajanan Raghunath Aher, Pawan S. Soyam, Sachin D. Ralegankar, Sumita Kedia, Laxman M. Chaudhari, Vivek V. Antad, Sachin D. Ghude, Pramod D. Safai, Sanjay D. Chakane, Panuganti C. S. Devara
Format: Article
Language:English
Published: Springer 2022-08-01
Series:Aerosol and Air Quality Research
Subjects:
Aerosol optical depth
Ångström exponent
MODIS
Fine-mode aerosols
Coarse-mode aerosols
Coagulation
Online Access:https://doi.org/10.4209/aaqr.220104
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Summary:Abstract Atmospheric aerosol characterization experiments were conducted, for the first time, over AC-Ahmednagar, a semi-urban location in south-west India, using a multi-spectral solar radiometer from January 2016 to May 2018. The MODIS/Terra retrieved Level-2 daily swath AOD550 nm data sets during 2011–2021 were also used to infer long-term behaviour of columnar aerosols at AC-Ahmednagar. The daily-averaged, Microtops II Sun photometer measured AOD500 nm and AOD1020 nm and MODIS retrieved AOD550 nm reveal a discernible wide spectrum of variability in their magnitudes. Magnitude-wise, AODs at both the wavelengths depict an increasing trend of about 0.05 year−1 (AOD500 nm) and 0.03 year−1 (AOD1020 nm). However, MODIS AOD550 nm illustrates statistically insignificant increasing trend of about 0.007 year−1. Microtops II Sun photometer derived Angstrom exponent (AE) depicts a noticeable day-to-day variability with respect to its overall mean value (1.06 ± 0.30) indicating the presence of diverse-sized aerosols. The AOD500 nm against AE440-870 nm contour density map analysis qualitatively characterizes different aerosol types prevalent in the atmospheric column. The weighted PSCF (WPSCF) analysis for AOD performed on a seasonal basis reveals the presence of possible contribution of long-range transported plumes of varied aerosols on different scales and types from a variety of emission sources from different regions.
ISSN:1680-8584
2071-1409

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