B. S. K. REDDY, K. R. KUMAR, G. BALAKRISHNAIAH, K. R. GOPAL, R. R. REDDY, V. SIVAKUMAR, S. Md. ARAFATH, A. P. LINGASWAMY, S. PAVANKUMARI, K. UMADEVI, Y. N. AHAMMED. 2013: Ground-Based In Situ Measurements of Near-Surface Aerosol Mass Concentration over Anantapur: Heterogeneity in Source Impacts. Adv. Atmos. Sci, 30(1): 235-246., https://doi.org/10.1007/s00376-012-1234-5
Citation: B. S. K. REDDY, K. R. KUMAR, G. BALAKRISHNAIAH, K. R. GOPAL, R. R. REDDY, V. SIVAKUMAR, S. Md. ARAFATH, A. P. LINGASWAMY, S. PAVANKUMARI, K. UMADEVI, Y. N. AHAMMED. 2013: Ground-Based In Situ Measurements of Near-Surface Aerosol Mass Concentration over Anantapur: Heterogeneity in Source Impacts. Adv. Atmos. Sci, 30(1): 235-246., https://doi.org/10.1007/s00376-012-1234-5

Ground-Based In Situ Measurements of Near-Surface Aerosol Mass Concentration over Anantapur: Heterogeneity in Source Impacts

  • Surface measurements of aerosol physical properties were made at Anantapur (14.62oN, 77.65oE, 331 m a.s.l), a semiarid rural site in India, during August 2008--July 2009. Measurements included the segregated sizes of aerosolsas as well as total mass concentration and size distributions of aerosols measured at low relative humidity (RH-3, with a mean value of 34.02±9.05 μm-3 for the entire study period. A clear diurnal pattern appeared in coarse, accumulation and nucleation-mode particle concentrations, with two local maxima occurring in early morning and late evening hours. The concentration of coarse-mode particles was high during the summer season, with a maximum concentration of 11.81±0.98 μm-3 in the month of April, whereas accumulation-mode concentration was observed to be high in the winter period contributed >68% to the total aerosol mass concentration. Accumulation aerosol mass fraction, Af (= Ma/Mt) was highest during winter (mean value of Af ~0.80) and lowest (Af ~0.64) during the monsoon season. The regression analysis shows that both Reff and Rm are dependent on coarse-mode aerosols. The relationship between the simultaneous measurements of daily mean aerosol optical depth at 500 nm (AOD500) and PM2.5 mass concentration (PM2.5) shows that surface-level aerosol mass concentration increases with the increase in columnar aerosol optical depth over the observation period.
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