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Analysis of AOD Characteristics Retrieved from Himawari-8 Using Sun Photometer in South Korea

태양광도계 자료를 이용한 한반도 내 Himawari-8 관측 AOD 특성 분석

  • Lee, Gi-Taek (Department of Atmospheric Science, Kongju National University) ;
  • Ryu, Seon-Woo (Department of Atmospheric Science, Kongju National University) ;
  • Lee, Tae-Young (Department of Atmospheric Science, Kongju National University) ;
  • Suh, Myoung-Seok (Department of Atmospheric Science, Kongju National University)
  • 이기택 (공주대학교 대기과학과) ;
  • 유선우 (공주대학교 대기과학과) ;
  • 이태영 (공주대학교 대기과학과) ;
  • 서명석 (공주대학교 대기과학과)
  • Received : 2020.06.04
  • Accepted : 2020.06.11
  • Published : 2020.06.30

Abstract

Through the operations of advanced geostationary meteorological satellite such as Himawari-8 and GK2A, higher resolution and frequency of AOD (Aerosol Optical Depth) data have become available. In this study, we analyzed the characteristics of Himawari-8/AHI (Advanced Himawari Imager) aerosol properties using the recent 4 years (2016~2019) of Sun photometer data observed at the five stations(Seoul National University, Yonsei University, Hankuk University of Foreign Studies, Gwangju Institute of Science and Technology, Anmyon island) which is a part of the AERONET (Aerosol Robotic Network). In addition, we analyzed the causes for the AOD differences between Himawari AOD and Sun photometer AOD. The results showed that the two AOD data are very similar regardless of geographic location, in particular, for the clear condition (cloud amount < 3). However, the quality of Himawari AOD data is heavily degraded compared to that of the clear condition, in terms of bias (0.05 : 0.21), correlation (0.74 : 0.64) and RMSE (Root Mean Square Error; 0.21 : 0.51), when cloud amount is increased. In general, the large differences between two AOD data are mainly related to the cloud amount and relative humidity. The Himawari strongly overestimates the AOD at all five stations when cloud amount and relative humidity are large. However, the wind speed, precipitable water, height of cloud base and Angstrom Exponent have been shown to have no effect on the AOD differences irrespective of geographic location and cloud amount. The results suggest that caution is required when using Himawari AOD data in cloudy conditions.

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