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Korean Meteorological Society (한국기상학회)
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A Study on the Monthly Characteristics of Solar UV Radiation in Gosan, Jeju

제주도 고산지역 자외선복사의 월변화 특성과 원인 고찰

  • Kim, Young-Ah (Environmental Meteorology Research Division, National Institute of Meteorological Sciences) ;
  • Choi, Wookap (School of Earth and Environmental Sciences, Seoul National University)
  • 김영아 (국립기상과학원 환경기상연구과) ;
  • 최우갑 (서울대학교 지구환경과학부)
  • Received : 2017.05.08
  • Accepted : 2017.08.24
  • Published : 2017.09.30
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Abstract

The monthly-mean irradiance of ultra violet (UV)-B and UV-A observed from 2005 to 2014 and 2012 to 2014, respectively, at noon in Gosan, Jeju, South Korea are analyzed. We compare cloudiness, total ozone, visibility, and relative humidity with an emphasis on the four months from May to August (MJJA), which shows the largest UV radiation. While the incoming UV-B radiation at the top of the atmosphere in Gosan is the largest in June due to the small solar zenith angle, the observed surface UV-B shows an unexpected smaller value in June than those in May, July or August. In June, the meteorological conditions affecting Gosan are completely dominated by cloudiness and thus, frequent overcast seems to determine the minimum UV-B. Another important UV-determining factor is the total ozone, which exhibits a monotonic decrease during MJJA without agreeing to the characteristic feature of UV. The ratio of UV-B to UV-A is not generally influenced by cloudiness. Thus, the ratio is a useful indicator of atmospheric turbidity showing larger values for increasing visibility, except in June. A simple model has been used to estimate surface UV by using the observed ozone and visibility in the cloudless condition. The result shows that UV has the lowest value in June with small variation during MJJA. Model estimation also shows that the different characteristic features observed in July between surface UV-B and UV-A is the result of less absorption of UV-B by ozone than that of UV-A by a smaller amount of total ozone.

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References

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