Akshansha Chauhan  1, Shukla Acharjee2, Ramesh P. Singh  This email address is being protected from spambots. You need JavaScript enabled to view it.3, Brent Holben4

1 Center for Space and Remote Sensing Research, National Central University, Taoyuan 320317, Taiwan
2 Dibrugarh University, Dibrugarh-786004, Assam, India
3 School of Life and Environmental Sciences, Chapman University, Orange, CA 92866, USA
4 NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

Received: September 11, 2022
Revised: March 1, 2023
Accepted: March 12, 2023

 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.220320  

Cite this article:

Chauhan, A., Acharjee, S., Singh, R.P., Holben, B. (2023). Dynamic Characteristics of Aerosol Optical Properties over Dibrugarh City in the North-Eastern Indian Region during 2018–2021. Aerosol Air Qual. Res. 23, 220320. https://doi.org/10.4209/aaqr.220320


  • Higher aerosol concentration corresponds to the growing anthropogenic activities.
  • Long-range transport of airmass mixes with the local anthropogenic emissions.
  • The outflow emissions from IGP show pronounced changes in aerosol characteristics.
  • Contrasting radiative forcing observed near the surface and atmosphere.


Aerosols play an important role in the earth's environment across the globe through their involvement in various earth system cycles. The change in the aerosol properties may cause short and long-term impacts, the knowledge of such changes is useful in the estimation of the pollution sources of any region. We have carried out the analysis of the aerosols' optical and radiative properties using AERONET station data from 2018 to 2021 in Dibrugarh City. The higher Aerosol Optical Depth (AOD) values during winter and pre-monsoon months indicate high anthropogenic activities, and biomass burning in Dibrugarh. The impact of various sources and daily meteorological parameters help in understanding the diurnal variations of the AOD, Ångström Exponent (AE), and column water (CW). Fine aerosol fractions dominate the aerosol volume, but sometimes the long-range transport of dust affects aerosol properties during pre-monsoon months (MAM). MODIS-derived AOD and AERONET AOD values show a good correlation, with R2 = 0.68. The highest volume of the aerosols reaches up to 0.11 µm3 µm–2 during pre-monsoon months, whereas it lies below 0.05 µm3 µm2 in other seasons. SSA values indicate the presence of scattering aerosols but in 2020, a sudden decline in the SSA values shows a strong rise in the absorbing aerosols. Throughout the study period (2018–2021), the positive radiative forcing indicates a rise in atmospheric heating.

Keywords: Dibrugarh, AERONET, Aerosols Optical Depth, Ångström Exponent

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