GEOGRAPHICAL RESEARCH ›› 2007, Vol. 26 ›› Issue (4): 821-828.doi: 10.11821/yj2007040019

• Climate and Global Change • Previous Articles     Next Articles

Distribution of biologically effective solarultraviolet radiation intensity on the ground in China

LIAO Yong-feng1,2, WANG Wu-yi1, ZHANG Li1, YANG Lin-sheng1   

  1. 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101,China;
    2. National Disaster Reduction Center of China, Beijing 100053, China
  • Received:2006-09-08 Revised:2007-03-22 Online:2007-07-25 Published:2007-07-25
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Abstract: With the stratospheric ozone layer turning thinner and thinner, to calculate solar ultraviolet radiation reaching the Earth's surface and assess its effects on human health has become a focus. Based on radiation transmission model of DISORT, a new method to calculate biologically effective ultraviolet radiation intensity on the ground is identified and spatial distribution of biologically effective ultraviolet radiation intensity in China in January and July,2000 is simulated using UVSPEC model of LibRadtran software package and GIS spatial analysis technique.This paper discusses the effects of the spatial and temporal variation of atmospheric ozone, cloud cover and ground albedo on ground ultraviolet radiation intensity, and explores the correction method with the result of DEM and cloud cover. In addition, it systematically analyzes the spatial distribution characteristics of ground biologically effective ultraviolet radiation intensity in China in January and July, 2000. Ultraviolet radiation intensity is higher in low latitude than that in mid-high latitude in January and on the contrary in July. Because of the higher altitude and lower ozone thickness, the ultraviolet radiation intensity is higher on the Tibetan Plateau than in the other regions in January. There are different radiation intensity distribution patterns between UVA and UVB in January and July because ozone can absorb more UVB radiation than UVA. Higher radiation distribution of UVB is closer to the low latitude than that of UVA. Owing to the higher relative spectral effective coefficient against 270nm of UVB, normalized UVB biologically effective radiation is about six times more than that of UVA.

Key words: biologically effective, ultraviolet radiation, UVA, UVB, spatial distribution