Journal of Korean Society for Geospatial Information Science (대한공간정보학회지)

Korea Spatial Information Society (대한공간정보학회)
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Cross-Correlation Analysis between GOSAT and CO2 Concentration Observed by the KGAWC Station

GOSAT과 안면도 지상 관측소에서 측정된 이산화탄소의 상관성 분석

  • Choi, Jin Ho (Dept. of Spatial Information, Kyungpook National University) ;
  • Joo, Seung Min (Dept. of Spatial Information, Kyungpook National University) ;
  • Um, Jung Sup (Dept. of Geography, Kyungpook National University)
  • Received : 2014.04.01
  • Accepted : 2014.06.03
  • Published : 2014.06.30
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Abstract

GOSAT satellite $CO_2$ signal in years (June, 2009-December 2012) were compared with ground-based measurement at Anmyeon-do Korea Global Atmosphere Watch Center (KGAWC), located on the west coast of the Korean Peninsula. The result reveals that GOSAT signature is closely associated with ground-based measurement($R^2=0.49$). Strong correlation occurred between summer and fall ($R^2=0.62$) while weak relationship between satellite and ground-based measurement were identified in winter and spring ($R^2=0.37$). Average $CO_2$ concentration of GOSAT were 6.31 ppm lower than the corresponding values obtained from ground-based measurements on the same date. It is anticipated that this research output could be used as a valuable reference in introducing GOSAT to confirm data quality assurance for area-wide carbon monitoring process in relation to Anmyeon-do KGAWC $CO_2$ Concentration data.

GOSAT 위성 신호와 한반도 서해안에 위치한 안면도 지상관측소 이산화탄소 관측값을 비교평가하는 연구를 수행하였다. GOSAT과 안면도 지상관측소의 관측값의 상관관계를 보여주는 $R^2$ 값은 0.49로 비교적 강한 양의 상관관계가 나타나고 있었다. 계절별 상관 분석 결과에서 여름과 가을($R^2=0.62$)에 강한 양의 상관계가가 나타나는 반면 봄과 겨울($R^2=0.37$)에는 보통의 양의 상관관계가 나타나 여름과 겨울이 좀 더 계절적으로 높은 상관계수를 보이고 있었다. 분석 기간(2009.6-2012.12) 중 GOSAT 이산화탄소 관측값이 지상관측소에 비해 다소 낮게 나타나고 있어 (평균 -6.31ppm), GOSAT 위성신호가 이산화탄소 농도를 지상관측소 측정 결과에 비해 과소평가하고 있음이 확인되었다. 이러한 분석 결과는 안면도와 제주 고산에 한정되어 있는 한반도의 이산화탄소 지상관측소의 시공간적 한계성을 극복할 수 있는 대안으로 GOSAT 위성의 활용가능성을 판단할 수 있는 근거가 될 수 있을 것이다.

Keywords

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