한국지구과학회지 (Journal of the Korean earth science society)

  • 제36권2호
  • /
  • Pages.139-157
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  • 2015
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  • 1225-6692(pISSN)
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  • 2287-4518(eISSN)
한국지구과학회 (The Korean Earth Science Society)
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북반구 해빙 지역에서 세 종류 위성관측 표면온도에 대한 오차분석

Error Analysis of Three Types of Satellite-observed Surface Skin Temperatures in the Sea Ice Region of the Northern Hemisphere

  • 강희정 (이화여자대학교 대기과학공학과) ;
  • 유정문 (이화여자대학교 과학교육과)
  • Kang, Hee-Jung (Department of Atmospheric Science and Engineering, Ewha Womans University) ;
  • Yoo, Jung-Moon (Department of Science Education, Ewha Womans University)
  • 투고 : 2015.01.14
  • 심사 : 2015.04.15
  • 발행 : 2015.04.30
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초록

본 연구에서는 위성관측 표면온도 및 해당 온도경향의 불확실성을 조사하기 위하여 북반구($30-90^{\circ}N$) 해양 지역에서 2003-2014년 4월 16-24일 기간에 세 종류의 위성관측 자료(MODIS IST, AIRS/AMSU SST, AIRS only SST)를 상호 비교하였다. AIRS/AMSU 표면온도값에 비하여 MODIS는 해빙과 해수의 경계지역에서 계통적으로 최대 1.6 K 높은 반면에, 해빙 지역에서는 2 K 낮았다. 이러한 주요 원인은 표면온도 산출알고리즘의 해표 정보(e.g., 해빙 탐지)를 위하여 MODIS는 적외 채널만을 사용하는 반면에, AIRS/AMSU는 마이크로파 및 적외 채널을 함께 사용하는 데에 있다. 미국 항공우주국(NASA's Goddard Space Flight Center; NASA/GSFC)은 AMSU-A의 노후화를 대비하기 위하여 AIRS/AMSU 알고리즘을 일부 수정하여 AIRS only 알고리즘을 개발하였다. AIRS/AMSU와 AIRS only 표면온도 사이에 평균 제곱근 오차(RMSE)값은 $30-90^{\circ}N$ 해양 지역에서 0.55 K이며, 편차(bias)는 0.13 K이었으며, 해빙/해수 경계 지역에서는 이들 차이가 더 크게 나타났다. 해빙 경계지역에서 AIRS/AMSU와 AIRS only 간의 차이가 다른 지역에 비하여 큰 이유는 AIRS only 알고리즘이 AMSU 마이크로파 자료 대신에 GCM (NOAA Global Forecast System) 온도 산출물을 사용하는 데에 있다. 세 종류의 위성관측 표면온도 자료는 $70-80^{\circ}N$ 위도대에서 유의적인 온도증가($0.23-0.28Kyr^{-1}$)를 보였다. 위성관측 표면온도들 간에 계통적인 불일치는 같은 방향(온도증가 또는 온도감소)으로 해당 온도경향 값들 간의 차이에 영향을 줄 수 있다.

We investigated the relative errors of satellite-observed Surface Skin Temperature (SST) data caused by sea ice in the northern hemispheric ocean ($30-90^{\circ}N$) during April 16-24, 2003-2014 by intercomparing MODerate Resolution Imaging Spectroradiometer (MODIS) Ice Surface Temperature (IST) data with two types of Atmospheric Infrared Sounder (AIRS) SST data including one with the AIRS/Advanced Microwave Sounding Unit-A (AMSU) and the other with 'AIRS only'. The MODIS temperatures, compared to the AIRS/AMSU, were systematically up to ~1.6 K high near the sea ice boundaries but up to ~2 K low in the sea ice regions. The main reason of the difference of skin temperatures is that the MODIS algorithm used infrared channels for the sea ice detection (i.e., surface classification), while microwave channels were additionally utilized in the AIRS/AMSU. The 'AIRS only' algorithm has been developed from NASA's Goddard Space Flight Center (NASA/GSFC) to prepare for the degradation of AMSU-A by revising part of the AIRS/AMSU algorithm. The SST of 'AIRS only' compared to AIRS/AMSU showed a bias of 0.13 K with RMSE of 0.55 K over the $30-90^{\circ}N$ region. The difference between AIRS/AMSU and 'AIRS only' was larger over the sea ice boundary than in other regions because the 'AIRS only' algorithm utilized the GCM temperature product (NOAA Global Forecast System) over seasonally-varying frozen oceans instead of the AMSU microwave data. Three kinds of the skin temperatures consistently showed significant warming trends ($0.23-0.28Kyr^{-1}$) in the latitude band of $70-80^{\circ}N$. The systematic disagreement among the skin temperatures could affect the discrepancies of their trends in the same direction of either warming or cooling.

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참고문헌

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피인용 문헌

  1. Uncertainties of satellite-derived surface skin temperatures in the polar oceans: MODIS, AIRS/AMSU, and AIRS only vol.8, pp.10, 2015, https://doi.org/10.5194/amt-8-4025-2015