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Title of Journal: Adv Atmos Sci

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Abbravation: Advances in Atmospheric Sciences

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SP Science Press

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10.1016/j.ajog.2016.07.045

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1861-9533

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Assessment of erythemal UV level in Nepal based on

Authors: Binod Kumar Bhattarai Berit Kjeldstad Trond Morten Thorseth
Publish Date: 2011/06/23
Volume: 28, Issue: 4, Pages: 789-796
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Abstract

Nepal lies on the southern slope of Himalaya in Asia In a width ranging between 15150 and 250 km the altitude varies greatly from about 100 m at its southern border to a maximum of 8848 min the northern part Like the variation in altitude climatic condition varies quite a lot Longterm monthly mean erythemal UV daily dose values for Nepal are evaluated using Total Ozone Mapping Spectrometer TOMS estimation from the time of its overpass between 1996 and 2003 The results are presented as summer and winter maps of mean UV levels in each satellite grid The mean winter erythemal UV daily dose ranges between 21 and 36 kJ mt−2 whereas summer values are found to lie between 46 and 97 kJ mt−2 The altitude variation increases the UV levels by about 02 kJ km−1 in winter months and 09 kJ km−1 in summer A multiyear monthly average erythemal daily dose in most of the areas shows that the summer value is about three times higher than that in winter Although yeartoyear variation is not pronounced in high and midelevation regions UV levels seemed to decrease from 1997 to 2002 in the southern part of the country in the low elevation region by about 535 Due to the combined effects of the altitude low ozone concentration in the troposphere and thin air surface UV radiation at higher altitudes is found to be higher than in the surrounding regions

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