IMPACT OF INORGANIC AEROSOLS ON CLIMATE CHANGE, ENVIRONMENT OPTICAL PROPERTIES OF NANO3, NH4NO3

Aerosol particles influence radiative forcing directly through reflection and absorption of solar and infrared radiation in the atmosphere. Some aerosols cause a positive forcing while others cause a negative forcing. They are also acting as nuclei for cloud formation Tropospheric aerosols are mainly composed of inorganic salts, accounting to 25–50% of the fine aerosol mass [2]. In this study, the optical properties of inorganic aerosols, including ammonium nitrate NH4NO3 and sodium nitrate NaNO3 are explored using the pseudo-potential plane wave (PP-PW) scheme in the frame of generalized gradient approximation (GGA). The dielectric functions, reflective index, extinction coefficient, reflectivity and energy-loss spectrum are calculated and discussed. The absorption spectra of ammonium nitrate and sodium nitrate are localized in the ultraviolet range between 75 and 350 nm and 60 and 380 nm respectively.