10.2190/9Q38-TPPP-MEM2-16FW 9Q38TPPPMEM216FW 341 EFFECT OF ANTHROPOGENIC POLLUTION ON GROUND REACHING SOLAR UV-B RADIATION-- A CASE STUDY 341 346 20040803 20040803 20040803 20040803 9Q38TPPPMEM216FW.pdf http://baywood.metapress.com/link.asp?target=contribution&id=9Q38TPPPMEM216FW 4 K. MADHAVI LATHA K. V. S. BADARINATH National Remote Sensing Agency, Balanagar, India Solar ultraviolet radiation reaching the earth's surface has been extensively discussed because of its biological and photochemical activity. Emphasis has been placed on the potential increase in surface UV radiation due to the depletion of stratospheric ozone. The present study deals with the variations of UV-B and Aerosol Optical Depth (AOD) with respect to hazy-day and day-after scavenging due to heavy rain washout in a tropical urban environment. Special variation of AOD showed high aerosol loading at 380 nm, suggesting dominant accumulation mode particle loading. Comparison of UV-B intensities with AOD on hazy-day and day-after heavy rain washout suggests ~45% increase in UV-B intensities. The results are discussed in detail in the article. R. Singh, R. S. Tanwar, and S. Nath, Episodic Dominant Aerosol Effect on Solar UV-B Radiation Intensities under Special Environmental Conditions over Delhi during Summer Months, IASTA, pp. 2116-2118, 2002. J. Reuder and H. Schwander, Aerosol Effects on UV Radiation in Non-Urban Regions, Journal of Geophysical Research, 104, pp. 4065-4067, 1999. J. R. Herman, P. K. Bharha, J. Ziembke, Z. Ahmad, and D. Larks, V-B increases (1979-1992) from Decreases in Total Ozone, Geophysical Research Letters, pp. 2317-2321, 1996. S. C. Liu, S. A. McKeen, and S. Madronich, Effect of Anthropogenic Aerosols on Biologically Active Ultraviolet Radition, Geophysical Research Letters, 8, pp. 2265-2268, 1991. B. Leckner, The Spectral Distribution of Solar Radiation at the Earth's Surface-- Elements of Model, Solar Energy, 20, pp. 143-150, 1978. K. Niranjan, G. B. Satyanarayana, and S. Thulasiraman, Short Period Variations in Extinction Coefficients at a Coastal Urban Station, Visakhapatnam, Indian Journal of Radio and Space Physics, 24, pp. 113-117, 1995. A. Kylling, A. F. Bais, M. Blumthaler, R. J. Schrede, C. S. Zerefos, and E. Kosmidis, Aerosols on Solar UV Irradiances during the Photochemical Activity and Solar Ultraviolet Radiation Campaign, Journal of Geophysical Research, 103, pp. 2605126060, 1998. G. Pandithurai, P. C. S. Devara, R. S. Maheskumar, R. P. Ernest, and K. K. Dani, Spectral Characteristics of Urban Aerosols and Their Association with Relative Humidity, Journal of Atmospheric Research, 45, pp. 109-122, 1997. J. W. Krzyscin and S. Puchalski, Aerosol Impact on the Surface UV radiation from the Ground-Based Measurements Taken at Belsk, Poland, 1980-1996, Journal of Geophysical Research, 103, pp. 16175-161181, 1998. B. N. Wenny, J. S. Schafer, J. J. DeLuisi, W. K. Saxena, W. F. Barnard, I. V. Petropavolvsikh, and A. J. Vergamini, A Study of Regional Aerosol Radiative Properties and Effects on Ultraviolet-B Radiation, Journal of Geophysical Research, 103, pp. 17083-17097, 1998.