title: Parametric retrieval model for estimating aerosol size distribution via the AERONET, LAGOS station.
abstract: 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.
authors.affiliation: Department of Physics, Covenant University Canaan Land, P.M.B 1023, Ota, 122333, Nigeria. Electronic address: moses.emetere@covenantuniversity.edu.ng.
authors.forename: Moses Eterigho
authors.initials: ME
authors.lastname: Emetere
authors.affiliation: Department of Physics, Covenant University Canaan Land, P.M.B 1023, Ota, 122333, Nigeria.
authors.forename: Marvel Lola
authors.initials: ML
authors.lastname: Akinyemi
authors.affiliation: Department of Physics, University of Ibadan, Nigeria.
authors.forename: Omololu
authors.initials: O
authors.lastname: Akin-Ojo
mesh_terms: D000336:Aerosols; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D004784:Environmental Monitoring / Q000379:methods*; D008962:Models, Theoretical; D009549:Nigeria; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D014887:Weather; D014919:Wind
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D052638:Particulate Matter
keywords: Aerosol optical depth; Aerosol size distribution; Dispersion model; Optical bands; Unified number