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Titre : Monitoring of atmospheric aerosols at anantapur 14 62 n 77 65 e ap india

Auteur : Vasudeva Reddy M. 

Université de soutenance : Jawaharlal Nehru Technological University, Anantapuram

Grade : Doctor of Philosophy (PhD) 2018

Résumé partiel
Atmospheric aerosols refer to solid and liquid particles with radii of a few nanometers to a few tens of micrometers in the air. Aerosols have very interesting and important effect on weather, for instance rainfall can be quite different in polluted air when compared to clean air, and strome systems can intensify very rapidly. We need to understand these effects very clearly as they are loading too many hazardous changes in weather systems. Spectral variation of monthly average aerosol optical depth is derived for three seasons of the year 2015 over Anantapur and the AOD values were found to be high during the summer, because of occurrence of dust storms and low during the Post-Monsoon season due to rain-washout process, upper winds and cloud scavenging effect at all wavelengths. High AOD values during summer months are in connection with high Alpha values represents the dominance of fine mode aerosols. The monthly variations in the Alpha, α designates the size distributions of aerosols and the mean and standard values of Alpha are found to be 1.45 ± 0.04 in winter, 1.41 ± 0.24 in summer and 1.21 ± 0.24 in Post-Monsoon seasons respectively. The strong decrease in Alpha values due to the partially attributed to cloud contamination. The monthly variation of different aerosol mass concentrations was derived for January – December 2013. The total aerosol mass concentration, the maximum concentration was observed in the month of April (43.72 ± 1.47 µg/m3 ) and minimum in the month of January (29.43 ± 3.14 µg/m3 ). The coarse mode aerosol mass concentration is remains low in August (3.81 ± 1.22 µg/m3 ) and high during January (9.88 ± 1.86 µg/m3 ) and the accumulation mode aerosol mass concentration increased from low value at January (10.54 ± 1.25 µg/m3 ) and reaches maximum in April (26.66 ± 1.24 µg/m3 ). In nucleation mode aerosol mass concentration is high in December (16.2 ± 3.99 µg/m3 ) and low in the month of February (8.26 ± 0.86 µg/m3 ).

Présentation et version intégrale (Shodhganga)