Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Seasonal Variation and Measurement Uncertainty of UV Aerosol Optical Depth Measured at Gwangju, Korea

자외선 영역의 에어로졸 광학 깊이의 계절 분포 및 불확실도의 계산

  • Kim, Jeong-Eun (Department of Environmental science and engineering, Gwangju Institute of science and Technology (GIST), Advanced Environmental Monitiring Research Chnter (ADEMRC)) ;
  • Kim, Young-Joon (Department of Environmental science and engineering, Gwangju Institute of science and Technology (GIST), Advanced Environmental Monitiring Research Chnter (ADEMRC))
  • 김정은 (광주과학기술원 환경공학과, 환경모니터링신기술연구센터) ;
  • 김영준 (광주과학기술원 환경공학과, 환경모니터링신기술연구센터)
  • Published : 2005.12.01
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Abstract

A UV-MFRSR instrument was used to measure the global and diffuse irradiances in 7 narrowband channels in the UV range 299.4, 304.4, 310.9, 317.3. 324.5, 331.3 and 367.4 nm at Gwangju ($35^{circ}\;13'N\;126^{circ}\;50'E$), Korea. Spectral UV-AOD was retrieved using the Langley plot method for data collected from April 2002 to July 2004. Temporal variation of AOD at 367.4 nm ($AOD_{367nm}$) showed a maximum in June ($0.95\pm0.43$) and a minimum in February ($0.31\pm0.14$). Clear seasonal variation of $AOD_{367nm}$ was observed with average values of $0.68\pm0.29,\;0.82\pm0.41,\;0.48\pm0.22\;and\;0.42\pm0.21$ in spring, summer, fall and winter, respectively, Average Angstrom exponent for the entire monitoring period was $2.03\pm0.75$ in the UV-A ($324.5\∼367.4$ nm) range. Seasonal variation of the Angstrom exponent showed a maximum in spring and a minimum in summer. The lowest Angstrom exponent in summer might be due to hygroscopic growth of particles under conditions of high relative humidity. UV-AOD changes under different atmospheric conditions were also analyzed. Uncertainty in retrieving spectral UV-AOD was also estimated to range between $\pm0.218\;at\;304.4\;nm\;and\;\pm0.135\;at\;367.4\;nm$. Major causes of uncertainty were total column ozone retrieval and extraterrestrial irradiance retrieval at shorter and longer wavelengths, respectively.

Keywords

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