Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Depolarization Ratio Retrievals Using AERONET Sun Photometer Data

  • Lee, Kyung-Hwa (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Muller, Detlef (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Noh, Young-Min (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Shin, Sung-Kyun (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Shin, Dong-Ho (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST))
  • Received : 2010.06.28
  • Accepted : 2010.08.25
  • Published : 2010.09.25
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Abstract

We present linear particle depolarization ratios (LPDRs) retrieved from measurements with an AERONET Sun photometer at the Gwangju Institute of Science and Technology (GIST), Korea ($35.10^{/circ}N$, $126.53^{\circ}E$) between 19 October and 3 November 2009. The Sun photometer data were classified into three categories according to ${\AA}$ngstr$\ddot{o}$ exponent and size distribution: 1) pure Asian dust (19 October 2009), 2) Asian dust mixed with urban pollution observed in the period from 20-26 October 2009, and 3) clean conditions (3 November). We show that the LPDRs can be used to distinguish among Asian dust, mixed aerosol, and non-Asian dust in the atmosphere. The mean LPDR of the pure Asian dust case is 23 %. Mean LPDRs are 13 % for the mixed case. The lowest mean LPDR is 6 % in the clean case. We compare our results to vertically resolved LPDRs (at 532 nm) measured by a Raman LIDAR system at the same site. In most cases, we find good agreement between LPDRs derived with Sun photometer and measured by LIDAR.

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References

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