Study of Absorbance and Emissivity Solar Radiation by Clouds, Aerosols and Some Atmospheric Gases

Abstract

The atmosphere consists of a quantity of clouds, aerosols, and gases. The solar radiation that reaches the earth's surface depends on this quantity. The amounts of solar radiation at the earth's surface are lower than the amounts of solar radiation reaching the upper surface of the atmosphere. The aim of this research is the study of absorbance and emissivity solar radiation by cloud, aerosols and methane gas. Data were taken by Top Solar Radiation (TSR), Surface Solar Radiation (SSR), Surface Thermal Radiation (STR), Surface Thermal Radiation Downward (STRD), Top Thermal Radiation (TTR), Albedo (AL), Total Cloud Cover (TCC), Aerosols Optical Depth at wavelength550nm (AOD550nm) and Methane (CH4) from satellites recorded by the European Centre for Medium-Range Weather Forecasts (ECMWF) the choice of year is 2016 in Baghdad city (33.375°N-44.375°E). Where we studied the short and long-wave solar radiation and its relationship with a cloud, aerosol and methane gas during the hourly mean at the times 00:00 am-12:00 pm and a cycle in temperature variation. The results showed that at the time 00:00 am was inverse correlation coefficient highest was -0.9 and their positive correlation coefficient highest was 0.6 with CH4. where represent very high correlation then followed and clouds and aerosols. Absorption, emission, and albedo by clouds, aerosols, and gases depend on the quantity, abundance, composition, location, distribution, meteorological parameters and wavelength of each air component, as well as on the strength of the solar and the thermal radiation at the times 00:00 am-12:00 pm.