Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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The Measurements of Biomass Burning Aerosols from GLI Data

GLI 자료를 이용한 생체 소각 에어러솔 측정에 대한 연구

  • Lee Hyun Jin (Department of Atmospheric Science, Pusan National University) ;
  • Fukushima Hajime (School of High-Technology for Human Welfare, Tokai University) ;
  • Ha Kyung-Ja (Department of Atmospheric Science, Pusan National University) ;
  • Kim Jae Hwan (Department of Atmospheric Science, Pusan National University)
  • Published : 2005.08.01
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Abstract

This study has investigated the suitable wavelength for detecting biomass burning aerosols. We have performed the analysis of the wavelength at 380nm in near-UV, 400nm, 412nm, 460nm, and 490nm in visible, and 2100nm in shortwave infrared regions from the Global Imager measurements. It is well known that the UV bands have the advantage of the aerosols retrieval due to the low surface reflectance and a weak effect of Bidirectional Reflectivity Distribution Function. However, the pure surface reflectances of shortwave visible bands, except 412nm, are as low as that of 380nm in near-UV over northeast Asia. In order to detect the aerosol signal, we have retrieved the aerosol reflectance as a function of wavelength based on the surface reflectivity contrast method for the period of May 2003. It is interesting that the retrieved aerosol reflectance with 460nm is slightly more sensitive than that with 380nm. Additionally, we have applied the TOMS aerosol index method to determine the best pair for biomass burning aerosols and found that the pair of 380 and 460nm results in the best signal for retrieving aerosols.

본 연구에서는 GLI 센서의 자외선인 380nm, 가시광선 영 역의 400nm와 412nm, 가시광선의 푸른 파장영역인 460nm와 490nm, 근파장 적외선인 2100nm를 비교 분석하여 생체 소각 에어러솔 탐지에 효과적인 파장을 살펴보고자 하였다. 자외선 파장이 지표 반사도가 낮고 BRDF 효과도 작게 나타나므로 에어러솔 추정시 효과적이라고 알려져 있으나 412nm를 제외한 400nm, 460nm, 490nm에서 380nm와 비슷한 지표 반사도를 보였다. 지표 반사도 대비 방법을 2003년 5월에 적용해 에어러솔 반사도를 산출하였을때 460nm의 에어러솔 반사도가 380nm 보다 민감하게 나타났다. GLI의 두파장을 이용해 TOMS 에어러솔 지수를 산출하였을 때 생체 소각 에어러솔은 흡수성 에어러솔로 나타났으며 380nm와 460nm를 이용한 TOMS 에어러솔 지수가 AERONET의 에어러솔 광학 두께와 높은 상관관계를 보이며 에어러솔의 광학 두께에 민감하게 반응하고 있다. 그러므로 생체소각 에어러솔을 탐지할 때에는 가시광선의 푸른색 영역의 파장대가 효과적일 것으로 사료된다.

Keywords

References

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