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Title: Impact of aerosol optical depth on UV-B radiation-A case study over Eastern Ghats
Authors: Kant, Yogesh
Sharma, M C
Ghosh, A B
Gupta, P K
Prasad, V Krishna
Badarinath, K V S
Mitra, A P
Issue Date: Apr-2000
Publisher: NISCAIR-CSIR, India
Abstract: A field experiment has been conducted in East Godavari district (Eastern Ghats) of Andhra Pradesh to investigate the relationship between aerosol optical depth and UV-B intensity over the biomass burning areas. Three sites were chosen for the measurements, in close horizontal proximity, to measure the aerosol optical depth, the UV-B intensity and erythemal doses. The Microtop-II sunphotometer was established at the sites to measure aerosol optical depth at five different wavelengths. The UV-B instruments, erythemal probe and UV-B biometer were used to measure the intensity of UV-B radiation and minimum erythemal dose. The study focuses on the attenuation of UV-B intensity and variation with respect to aerosol optical depth values over biomass burning areas. The comparison of the diurnal variation of the UV-B intensity over the burning sites with the ambient level reveals that there is reduction in the UV-B intensity peak during biomass burning phases. This reduction in UV-B intensity had been found to be 49%, 35% and 53% over the three different sites selected. An attempt has been made to deduce the fluctuations in the selective absorption of ozone at 297.5 nm in terms of the variability of UV-B intensity at 297.5 nm. The experiment showed the UV-B intensity restoring to its normal values after the biomass burning revealing that the variation in atmospheric ozone was not very large. The total atmospheric ozone varied from 256 D.U to 270 D.U. The relationship between UV-B intensity and aerosol optical depth gives a correlation coefficient of 0.614 for ambient level and 0.8498, 0.7387 and 0.588 for the biomass burning areas.
Page(s): 71-80
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(2) [April 2000]

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