Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Retrieval of Nitrogen Dioxide Column Density from Ground-based Pandora Measurement using the Differential Optical Absorption Spectroscopy Method

차등흡수분광기술을 이용한 지상기반 Pandora 관측으로부터의 대기 중 이산화질소 칼럼농도 산출

  • Yang, Jiwon (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Hong, Hyunkee (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Choi, Wonei (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Park, Junsung (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Kim, Daewon (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Kang, Hyeongwoo (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Lee, Hanlim (Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University) ;
  • Kim, Joon (Department of Atmospheric Sciences, Yonsei University)
  • 양지원 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 홍현기 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 최원이 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 박준성 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 김대원 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 강형우 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 이한림 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 김준 (연세대학교 대기과학과)
  • Received : 2017.12.05
  • Accepted : 2017.12.22
  • Published : 2017.12.31
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Abstract

We, for the first time, retrieved tropospheric nitrogen dioxide ($Trop.NO_2$) vertical column density (VCD) from ground-based instrument, Pandora, using the optical density fitting based on Differential Optical Absorption Spectroscopy (DOAS)in Seoul for the period from May 2014 to December 2014. The $Trop.NO_2$ VCDs retrieved from Pandora were compared with those obtained from Ozone Monitoring Instrument (OMI). A correlation coefficient (R) between those retrieved from Pandora and those obtained from OMI is 0.55. To compare with surface $NO_2$ VMRs obtained from in-situ, Trop. $NO_2$ VCDs retrieved from Pandora and those obtained from OMI are converted into $NO_2$ VMRs in boundary layer (BLH $NO_2$ VMRs) using data measured from Atmospheric Infrared Sounder (AIRS). Surface $NO_2$ VMRs obtained from in-situ range from 5.5 ppbv to 61.5 ppbv. BLH $NO_2$ VMRs retrieved from Pandora and OMI range from 2.1 ppbv to 44.2 ppbv and from 0.9 ppbv to 11.6 ppbv, respectively. The range of BLH $NO_2$ VMRs retrieved from OMI is narrower than that of BLH $NO_2$ VMRs retrieved from Pandora and surface $NO_2$ VMRs obtained from in-situ. There is a batter correlation between surface $NO_2$ VMRs obtained from in-situ and BLH $NO_2$ VMRs retrieved from Pandora (R= 0.50)than the correlation between surface $NO_2$ VMRs obtained from in-situ and BLH $NO_2$ VMRs retrieved from OMI (R = 0.36). This poor correlation is thought to be due to the lower near-surface sensitivity of the satellite-based instrument (OMI) than Pandora, the ground-based instrument.

본 연구에서는 처음으로 차등흡수분광기술(Differential Optical Absorption Spectroscopy, DOAS) 중 광학 두께 피팅(optical density fitting) 방법을 이용하여 지상기반 원격 측정 장비인 Pandora의 복사휘도 자료로부터 2014년 5월부터 12월 사이 서울에서의 대류권 이산화질소 연직칼럼농도를 산출하였다. 본 연구에서는 Pandora로부터 산출된 대류권 이산화질소 연직칼럼농도와 Aura 위성의 OMI (Ozone Monitoring Instrument) 센서로부터 산출된 대류권 이산화질소 연직칼럼농도를 비교하였다. Pandora로 부터 산출된 대류권 이산화질소 연직칼럼농도와 OMI 센서로부터 산출된 대류권 이산화질소 연직칼럼농도 사이의 상관계수(Correlation coefficient, R)는 0.55로 나타났다. 현장 측정 장비로부터 측정된 지표 이산화질소 혼합비와의 비교를 위해 AIRS (Atmospheric Infrared Sounder) 관측 자료를 이용하여 Pandora와 OMI센서로부터 산출된 대류권 이산화질소 연직칼럼농도를 행성경계층 내 이산화질소 혼합비로 변환하였다. 현장 측정 자료의 지표 이산화질소 혼합비는 5.5 ppbv에서 61.5 ppbv의 범위로 분포하였으며 Pandora와 OMI 센서로부터 산출된 행성경계층 내 이산화질소 혼합비는 각각 2.1 ppbv에서 44.2 ppbv, 0.9 ppbv에서 11.6 ppbv의 범위로 분포하였다. Pandora로부터 산출된 행성경계층 내 이산화질소 혼합비는 현장 측정 장비로부터 측정된 지표 이산화질소 혼합비와 비교적 비슷한 범위로 분포하였으나, OMI센서로부터 측정된 지표 이산화질소 혼합비는 현장 측정 장비와 Pandora의 이산화질소 혼합비에 비해 좁은 범위로 분포하였다. 현장 측정 장비로부터 측정된 지표 이산화질소의 혼합비와 Pandora로부터 산출된 행성경계층 내 이산화질소 혼합비 사이의 상관관계(R = 0.50)는 현장 측정 장비로부터 측정된 지표 이산화질소의 혼합비와 OMI로부터 산출된 행성경계층 내 이산화질소 혼합비 사이의 상관관계(R = 0.36)보다 좋은 것으로 나타났다. 이는 위성 기반 원격 측정 장비인 OMI센서는 지상 기반 원격 측정 장비인 Pandora 장비와 현장 측정 장비에 비하여 높은 고도에서 측정함으로써 지표 부근에 이산화질소에 대한 민감도가 떨어지기 때문인 것으로 생각된다.

Keywords

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