Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Retrieval and Validation of Aerosol Optical Properties Using Japanese Next Generation Meteorological Satellite, Himawari-8

일본 정지궤도 기상위성 Himawari-8을 이용한 에어로졸 광학정보 산출 및 검증

  • Lim, Hyunkwang (Global Environment Laboratory, Dept. of Atmospheric Sciences, Yonsei University) ;
  • Choi, Myungje (Global Environment Laboratory, Dept. of Atmospheric Sciences, Yonsei University) ;
  • Kim, Mijin (Global Environment Laboratory, Dept. of Atmospheric Sciences, Yonsei University) ;
  • Kim, Jhoon (Global Environment Laboratory, Dept. of Atmospheric Sciences, Yonsei University) ;
  • Chan, P.W. (Hong Kong Observatory)
  • 임현광 (연세대학교 대기과학과/지구환경연구소) ;
  • 최명제 (연세대학교 대기과학과/지구환경연구소) ;
  • 김미진 (연세대학교 대기과학과/지구환경연구소) ;
  • 김준 (연세대학교 대기과학과/지구환경연구소) ;
  • Received : 2016.12.12
  • Accepted : 2016.12.26
  • Published : 2016.12.31
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Abstract

Using various satellite measurements in UV, visible and IR, diverse algorithms to retrieve aerosol information have been developed and operated to date. Advanced Himawari Imager (AHI) onboard the Himawari 8 weather satellite was launched in 2014 and has 16 channels from visible to Thermal InfRared (TIR) in high temporal and spatial resolution. Using AHI, it is very valuable to retrieve aerosol optical properties over dark surface to demonstrate its capability. To retrieve aerosol optical properties using visible and Near InfRared (NIR) region, surface signal is very important to be removed which can be estimated using minimum reflectivity method. The estimated surface reflectance is then used to retrieve the aerosol optical properties through the inversion process. In this study, we retrieve the aerosol optical properties over dark surface, but not over bright surface such as clouds, desert and so on. Therefore, the bright surface was detected and masked using various infrared channels of AHI and spatial heterogeneity, Brightness Temperature Difference (BTD), etc. The retrieval result shows the correlation coefficient of 0.7 against AERONET, and the within the Expected Error (EE) of 49%. It is accurately retrieved even for low Aerosol Optical Depth (AOD). However, AOD tends to be underestimated over the Beijing Hefei area, where the surface reflectance using the minimum reflectance method is overestimated than the actual surface reflectance.

자외선, 가시광, 적외선 파장대역의 채널을 갖는 위성 관측에 기반한 다양한 에어로졸 정보산출 알고리즘에 대해 많은 연구가 이루어져 왔다. 본 연구에서는 최근 발사된 일본 기상위성 히마와리 8의 가시광-적외선 채널정보를 이용하여, 어두운 지표 위에서 에어로졸 광학정보를 산출하였다. 가시영역을 이용한 에어로졸 광학정보 산출은 지표신호의 정확한 제거가 매우 중요한데, 이는 최소반사도법을 사용하여 산출하였다. 본 알고리즘은 어두운 지표에서 에어로졸 광학정보를 산출을 하기에 구름, 사막 등과 같은 밝은 지표 위에서는 산출하지 않는다. AHI는 가시광채널 외에도, 다양한 적외 채널을 갖고 있어 공간 비균질성, 밝기온도차이(Brightness Temperature Difference, BTD) 등을 이용하여 구름제거가 가능하다. 밝기온도(Brightness Temperature, BT)를 이용해 하층운, 상층운 제거에 유리한 채널을 사용하여 구름을 제거하게 된다. Aerosol Optical Depth (AOD) 산출 결과로는 상관계수가 0.7, 기대오차(Expected Error, EE) 안에 있는 비율이 49%를 나타내고 있으며, 낮은 AOD에서도 정확한 산출이 이뤄지고 있음을 보이고 있다. 다만 베이징 허베이 지역에서는 에어로졸 광학두께를 과소모의하는 경향이 있는데, 이는 최소반사도법을 이용한 지표정보 산출이 실제 지표반사도보다 높게 지표면 정보를 추정하게 되기 때문으로 추정된다.

Keywords

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