Radiative Effects of Carbon Oxides (Cox) and Nitrogen Oxides (Nox) on Radiative Transfer in the Lower Atmosphere of Dakar In 2013

摘要

Dakar, like most African capitals, is characterized by a high human density, a dense transport network where motor vehicles are old and a high concentration of industries. Significant quantities of hydrocarbons are consumed daily to meet the energy needs of the economy; the combustion of hydrocarbons in engines and boilers in the presence of oxygen in the air produces various pollutants including carbon oxides (COx) and nitrogen oxides (Nox) found in the lower atmosphere. This work investigates the radiative forcing by Modtran6 following the concentrations of these two types of pollutants measured in the city of Dakar. Thus, this study has shown slight changes in the total radiance and a no less negligible place of ozone (especially in the dry season) whose peak absorption is 1040 cm-1 in the infrared. Atmospheric transmittance decreases throughout the width of the spectral band used during the rainy season; the most important jumps of this transmittance are observed around the wave numbers 800 cm-1 and 1050 cm-1.