COMPARATIVEANALYSISOFAEROSOL ÅNGSTRÖMEXPONENTVARIATIONIN POKHARA:ACASESTUDYCOMPARINGKANPUR ANDBEIJINGFORTHEYEARS2019AND2020
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Amrit Campus
Abstract
This thesis presents a collection of AOD data from AERONET followed by calculation
and comparative analysis of the Ångström Exponent (𝛼) variation in Pokhara (28.21°N,
83.96°E), Nepal, with Kanpur(26.45°N and 80.33°E), India, and Beijing (39.90°N,
116.41°E), China, for the years 2019 and 2020. The study utilizes mathematical analysis
to examine the fluctuations in 𝛼 values observed in these cities and investigates their
implications for air pollution dynamics. The maximum and minimum 𝛼 values are
calculated to be Pokhara (1.73 & 0.60); Kanpur (1.76 & 0.15) and Beijing (1.65 &
0.13) in the year 2019 and similarly, Pokhara (1.67 & 0.17); Kanpur(1.73 & 0.21)
and Beijing(1.65 & 0.16) in the year 2020, providing insights into the seasonal and
temporal variations of aerosols. The study explains the trimester-wise analysis of the
variation of 𝛼 in Pokhara with the comparison of two calendar years 2019 and 2020.
This further delves into the seasonal patterns of 𝛼, shedding light on the influence of
specific factors during different periods. The research also explores that 𝛼 does not only
depend upon the seasons and weather but also on meteorological parameters, pollutant
emissions, atmospheric conditions, and other multidimensional particles dissolved in the
atmosphere, however, the trend can be analyzed and compared. The analysis finally can
be inferred that in Pokhara, the aerosol loading and water deposition in the atmosphere
, is barely affected by anthropogenic sources. The findings underscore the significance
of understanding and addressing air pollution challenges in these regions. This study
contributes to the scientific understanding of 𝛼 variations and offers valuable insights
for policymakers and researchers working towards sustainable air quality management.