Parametric retrieval model for estimating aerosol size distribution via the AERONET, LAGOS station
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The size characteristics of atmospheric aerosol over the tropical region of Lagos, Southern Nigeria were
investigated using two years of continuous spectral aerosol optical depth measurements via the AERONET
station for four major bands i.e. blue, green, red and infrared. Lagos lies within the latitude of
6.465�N and longitude of 3.406�E. Few systems of dispersion model was derived upon specified conditions
to solve challenges on aerosols size distribution within the Stokes regime. The dispersion model
was adopted to derive an aerosol size distribution (ASD) model which is in perfect agreement with
existing model. The parametric nature of the formulated ASD model shows the independence of each
band to determine the ASD over an area. The turbulence flow of particulates over the area was analyzed
using the unified number (Un). A comparative study via the aid of the Davis automatic weather station
was carried out on the Reynolds number, Knudsen number and the Unified number. The Reynolds and
Unified number were more accurate to describe the atmospheric fields of the location. The aerosols
loading trend in January to March (JFM) and August to October (ASO) shows a yearly 15% retention of
aerosols in the atmosphere. The effect of the yearly aerosol retention can be seen to partly influence the
aerosol loadings between October and February.The size characteristics of atmospheric aerosol over the tropical region of Lagos, Southern Nigeria were
investigated using two years of continuous spectral aerosol optical depth measurements via the AERONET
station for four major bands i.e. blue, green, red and infrared. Lagos lies within the latitude of
6.465�N and longitude of 3.406�E. Few systems of dispersion model was derived upon specified conditions
to solve challenges on aerosols size distribution within the Stokes regime. The dispersion model
was adopted to derive an aerosol size distribution (ASD) model which is in perfect agreement with
existing model. The parametric nature of the formulated ASD model shows the independence of each
band to determine the ASD over an area. The turbulence flow of particulates over the area was analyzed
using the unified number (Un). A comparative study via the aid of the Davis automatic weather station
was carried out on the Reynolds number, Knudsen number and the Unified number. The Reynolds and
Unified number were more accurate to describe the atmospheric fields of the location. The aerosols
loading trend in January to March (JFM) and August to October (ASO) shows a yearly 15% retention of
aerosols in the atmosphere. The effect of the yearly aerosol retention can be seen to partly influence the
aerosol loadings between October and February.
Keywords
Q Science (General), QC Physics