Special Issue on Air Pollution and its Impact in South and Southeast Asia (VI)

Amol R. Kolhe1, Gajanan Raghunath Aher This email address is being protected from spambots. You need JavaScript enabled to view it.2, Pawan S. Soyam3,6, Sachin D. Ralegankar4, Sumita Kedia5, Laxman M. Chaudhari2, Vivek V. Antad2, Sachin D. Ghude6, Pramod D. Safai6, Sanjay D. Chakane1, Panuganti C.S. Devara7

1 Department of Physics, Arts, Science and Commerce College, Indapur, Pune, India
2 Department of Physics, Nowrosjee Wadia College, Pune, India
3 Department of Environmental Sciences, Savitribai Phule Pune University, Pune, India
4 Department of Physics, Ahmednagar College, Ahmednagar, India
5 Center for Development of Advanced Computing, Pune, India
6 Indian Institute of Tropical Meteorology, Pashan, Pune, India
7 Amity Centre for Ocean-Atmospheric Science and Technology, Amity University Haryana, India

Received: April 10, 2022
Revised: July 23, 2022
Accepted: July 27, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.220104  

Cite this article:

Kolhe, A.R. Aher, G.R., Soyam, P.S., Ralegankar, S.D., Kedia, S., Chaudhari, L.M., Antad, V.V., Ghude, S.D., Safai, P.D., Chakane, S.D.,  Devara, P.C.S. (2022). Aerosol Opto-physical Properties: Temporal Variation, Aerosol Type Discrimination and Source Identification. Aerosol Air Qual. Res. 22, 220104. https://doi.org/10.4209/aaqr.220104


  • Daily-averaged AODs reveal a discernible wide spectrum of magnitude variability.
  • MODIS AOD550 nm illustrates an insignificant increasing trend of about 0.007 year–1.
  • AOD vs AE plot characterizes aerosol types prevalent in the atmospheric column.
  • WPSCF analysis reveal possible contribution of long-range transported aerosol plumes.


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.

Keywords: Aerosol optical depth, Ångström exponent, MODIS, Fine-mode aerosols, Coarse-mode aerosols, Coagulation

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