Title: | Ground-based in situ measurements of near-surface aerosol mass concentration over Anantapur: Heterogeneity in source impacts |
Authors: | Reddy, B. S. K. Kumar, K. R. Balakrishnaiah, G. Gopal, K. R. Reddy, R. R. Sivakumar, V. Arafath, S. Md. Lingaswamy, A. P. Pavankumari, S. Umadevi, K. Ahammed, Y. N. 環境工程研究所 Institute of Environmental Engineering |
Keywords: | aerosols mass concentration;size distribution;effective radius;backward trajectories |
Issue Date: | 1-Jan-2013 |
Abstract: | Surface measurements of aerosol physical properties were made at Anantapur (14.62A degrees N, 77.65A degrees E, 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 < 75%) using a Quartz Crystal Microbalance (QCM) in the 25-0.05 mu m aerodynamic diameter range. The hourly average total surface aerosol mass concentration in a day varied from 15 to 70 mu g m(-3), with a mean value of 34.02 +/- 9.05 mu g m(-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 mu g m(-3) in the month of April, whereas accumulationmode concentration was observed to be high in the winter period contributed > 68% to the total aerosol mass concentration. Accumulation aerosol mass fraction, A (f) (= M (a)/M (t)) was highest during winter (mean value of A (f) 0.80) and lowest (A (f) 0.64) during the monsoon season. The regression analysis shows that both R (eff) and R (m) are dependent on coarse-mode aerosols. The relationship between the simultaneous measurements of daily mean aerosol optical depth at 500 nm (AOD(500)) 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. |
URI: | http://dx.doi.org/10.1007/s00376-012-1234-5 http://hdl.handle.net/11536/20807 |
ISSN: | 0256-1530 |
DOI: | 10.1007/s00376-012-1234-5 |
Journal: | ADVANCES IN ATMOSPHERIC SCIENCES |
Volume: | 30 |
Issue: | 1 |
Begin Page: | 235 |
End Page: | 246 |
Appears in Collections: | Articles |
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