Analysis of Aerosol Optical Depth and Angstrom Exponents over an AERONET site at Pokhara, Nepal

  • Jeevan Regmi Central Department of Physics, Tribhuvan University Kirtipur
  • Khem N Poudyal Dept. of Applied Sciences, Institute of Engineering Tribhuvan University, Lalitpur
  • Amod Pokhrel University of California Berkeley, California
  • Madhu Gyawali San Jacinto College, South Campus, 13735 Beamer Rd, Houston, TX 77089
  • Anthony Barinelli Franklin Pierce University, 40 University Drive, Rindge, NH
  • Rudra Aryal Franklin Pierce University, 40 University Drive, Rindge, NH
Keywords: Aerosol, Aerosol Optical Depth, Angstrom Exponent Monthly, Variations

Abstract

The monthly variability of Aerosol Optical Depth at 0.50 μm (AOD0.50) and Ångström exponents (AE) based on spectral AODs over an Aerosol Robotic Network (AERONET) site Pokhara are analyzed by using aerosol data of the year 2017. The AOD0.50 are characterized by low average values (0.21± 0.12) in monsoon, and highest values in pre-monsoon (0.67± 0.14) followed by winter (0.46± 0.28) and post-monsoon (0.33±.02) with an overall mean of 0.43 ± 0.02. The average AE obtained by using AODs at 0.44 μm and 0.87 μm is 1.20± 0.04 in pre-monsoon, 1.37± 0.05 in monsoon, 1.41±.01 in post-monsoon, and 1.37± 0.07 in winter with an annual average value of 1.35 ± 0.08. These overall variations of AE indicate that the majority of aerosol loading during the study period was a mixture of fine and coarse mode aerosols and the influence of anthropogenic aerosols. The monthly average AOD suggests low aerosol loading in the months of the monsoon season (June to September) than other months of pre-monsoon season (March to May) and post-monsoon season (October and November).

BIBECHANA 18 (1) (2021) 118-127

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Abstract
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Published
2021-01-01
How to Cite
Regmi, J., Poudyal, K., Pokhrel, A., Gyawali, M., Barinelli, A., & Aryal, R. (2021). Analysis of Aerosol Optical Depth and Angstrom Exponents over an AERONET site at Pokhara, Nepal. BIBECHANA, 18(1), 118-127. https://doi.org/10.3126/bibechana.v18i1.29448
Section
Research Article