Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Investigation of SO2 Effect on TOMS O3 Retrieval from OMI Measurement in China

OMI 위성센서를 이용한 중국 지역에서 TOMS 오존 산출에 대한 이산화황의 영향 조사 연구

  • Choi, Wonei (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) ;
  • Kim, Daewon (Division of Earth Environmental System Science, Major of Spatial Information Engineering, Pukyong National University) ;
  • Ryu, Jae-Yong (Department of Urban Environmental Engineering, Kyungnam University) ;
  • Lee, Hanlim (Division of Earth Environmental System Science, Major of Spatial Information Engineering, Pukyong National University)
  • 최원이 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 홍현기 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 김대원 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공) ;
  • 류재용 (경남대학교 도시환경공학과) ;
  • 이한림 (부경대학교 지구환경시스템과학부 공간정보시스템공학전공)
  • Received : 2016.11.17
  • Accepted : 2016.12.15
  • Published : 2016.12.31
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Abstract

In this present study, we identified the $SO_2$ effect on $O_3$ retrieval from the Ozone Monitoring Instrument (OMI) measurement over Chinese Industrial region from 2005 through 2007. The Planetary boundary layer (PBL) $SO_2$ data measured by OMI sensor is used in this present study. OMI-Total Ozone Mapping Spectrometer (TOMS) total $O_3$ is compared with OMI-Differential Optical Absorption Spectrometer (DOAS) total $O_3$ in various $SO_2$ condition in PBL. The difference between OMI-TOMS and OMI-DOAS total $O_3$ (T-D) shows dependency on $SO_2$ (R (Correlation coefficient) = 0.36). Since aerosol has been reported to cause uncertainty of both OMI-TOMS and OMI-DOAS total $O_3$ retrieval, the aerosol effect on relationship between PBL $SO_2$ and T-D is investigated with changing Aerosol Optical Depth (AOD). There is negligible aerosol effect on the relationship showing similar slope ($1.83{\leq}slope{\leq}2.36$) between PBL $SO_2$ and T-D in various AOD conditions. We also found that the rate of change in T-D per 1.0 DU change in PBL, middle troposphere (TRM), and upper troposphere and stratosphere (STL) are 1.6 DU, 3.9 DU and 4.9 DU, respectively. It shows that the altitude where $SO_2$ exist can affect the value of T-D, which could be due to reduced absolute radiance sensitivity in the boundary layer at 317.5 nm which is used to retrieve OMI-TOMS ozone in boundary layer.

본 연구에서는 2005년부터 2007년 사이에 중국 공업지대에서 Ozone Monitoring Instrument (OMI) 센서에서 관측한 이산화황 값의 증가에 따른 Total Ozone Mapping Spectrometer (OMI-TOMS)와 Differential Optical Absorption Spectrometer (OMI-DOAS) 오존전량 값의 차이를 위성자료를 이용하여 비교를 수행하였다. 중국 공업지대에서는 Planetary boundary layer (PBL)내의 이산화황을 나타내는 PBL $SO_2$ 자료가 사용되었다. 중국 공업지대에서 PBL내의 이산화황 농도 증가에 대하여 두 오존 값의 차이가 증가하는 경향성(R (Correlation coefficient) = 0.36)이 나타났다. 이산화황 이외에 두 오존 산출 알고리즘에 모두 영향을 미칠 수 있는 에어로솔 광학 두께(AOD; Aerosol Optical Depth)가 증가하는 경우 이산화황과 두 오존 값의 차이 사이의 회귀식의 기울기($1.83{\leq}slope{\leq}2.36$)가 비슷하게 유지되는 경향이 나타났다. 이는 다양한 AOD 조건에서도 이산화황이 두 오존 값의 차이를 증가시키는 관계가 나타나는 경향은 거의 비슷하게 유지되는 것으로 생각된다. 중국 공업지대에서 PBL내에 존재하는 이산화황과 화산 폭발에 의하여 고층(Middle troposphere (TRM), Upper troposphere and Stratosphere (STL))에서 존재하는 이산화황의 농도가 1 DU 증가하는 경우 두 오존 값의 차이는 각각 1.6 DU, 3.9 DU, 4.9 DU로 계산되었다. 고층(TRM, STL)의 이산화황과 저층(PBL)의 이산화황이 증가하는 경우 두 오존 값의 차이가 다르게 나타나는 것은 이산화황이 존재하는 고도에 따라서 두 오존 값의 차이에 미치는 영향이 다름을 의미한다. 이는 OMI-TOMS 오존을 산출하는데 사용되는 파장영역(317.5 nm)에서 행성경계층에서 이산화황에 의해 흡수되는 복사휘도의 감소된 민감도에 의한 것으로 생각된다.

Keywords

References

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