Dynamic Characteristics of Aerosol Optical Properties over Dibrugarh City in the North-Eastern Indian Region during 2018–2021

Authors

Akshansa Chauhan, National Central University, Taiwan
Shukla Acharjee, Dibrugarh University
Ramesh P. Singh, Chapman UniversityFollow
Brent N. Holben, National Aeronautics and Space Administration, Goddard Space Flight Center,

Document Type

Article

Publication Date

3-12-2023

Abstract

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 µm^–2 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.

Comments

This article was originally published in Aerosol and Atmospheric Chemistry, volume 23, issue 6, in 2023. https://doi.org/10.4209/aaqr.220320

Recommended Citation

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

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This work is licensed under a Creative Commons Attribution 4.0 License.