한국농림기상학회지, 제 12권 제4호(2010) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 12, No. 4, (2010), pp. 298~306
DOI: 10.5532/KJAFM.2010.12.4.298
ⓒ Author(s) 2014. CC Attribution 3.0 License.


실측 기반의 한반도지표자료동화체계를 이용하여 추정된 증발산 평가

임윤진(1,2), 변건영(1), 이태영(1), 김 준(1)
(1)연세대학교 대기과학과/지구환경연구소, (2)한국과학기술정보연구원 슈퍼컴퓨터 센터

(2010년 09월 09일 접수; 2010년 10월 05일 수정; 2010년 10월 25일 수락)

Evaluation of Evapotranspiration Estimation using Korea
Land Data Assimilation System

Yoon-Jin Lim(1,2), Kun-Young Byun(1), Tae-Young Lee(1), Joon Kim(1)
(1)Department of Atmospheric Sciences/Global Environment Laboratory,
Yonsei University, Shinchon-dong 134, Seodaemun-gu, Seoul 120-749, Korea
(2)Supercomputing Center, Korea Institute of Science and Technology Information,
335 Gwahangno, Yuseong-gu, Daejeon 305-806, Korea

(Received September 09, 2010; Revised October 05, 2010; Accepted October 25, 2010)

ABSTRACT
In this study, we evaluated the performance of Korea Land Data Assimilation System (KLDAS) for the estimation of evapotranspiration (ET) by comparing the modeled against the observed ET at Gwangneung deciduous forest of KoFlux site (GDK) from 2006 to 2008. Although the magnitudes of ET by KLDAS overestimated the observed ET, the seasonal patterns of KLDAS ET were comparable with the correlation coefficient of 0.78. The difference between the KLDAS ET and the observed ET was larger in spring and summer due to rapid plant growth and frequent rainfalls with high cloud cover, respectively. Compared to the ET estimated by NASA Global Land Data Assimilation System (GLDAS) with 0.25o and 1o resolution, the ET by KLDAS with 10 km resolution showed better agreement with the observation at the GDK site. Albeit further improvement is necessary, our results suggest that KLADS can be used as a practical tool to map ET and to examine its spatiotemporal variability over the Korean Peninsula.

Keyword: Evapotranspiration, Korea Land Data Assimilation System, Trend of evapotranspiration

MAIN

적요

본 연구에서는 한반도지표자료동화체계를 이용한 증발산 추정 능력 평가를 위하여 2006년부터 2008년까지 KoFlux 관측 중의 하나인 광릉 활엽수림에서 관측된 증발산과의 비교 검증을 실시하였다. 한반도지표자료동화체계를 통해 산출된 증발산은 관측과 0.78의 상관계수를 보이며, 관측된 증발산의 시계열을 잘 모의하였다. 그러나 연중내내 관측에 비해 과대모의하는 경향을 나타내었으며 이는 구름이 많고 강수가 흔히 발생하는 여름과 식생이 빠르게 자라기 시작하는 봄철에 더 크게 나타났다. 10km×10km 해상도의 한반도지표자료동화체계를 기반으로 한 추정 증발산은 물수지의 추세변화 연구에 주로 사용되는 0.25o와 1o 해상도의 전지구지표자료동화체계(Global Land Data Assimilation System, GLDAS)의 결과와 비교했을 때, 관측된 증발산의 크기와 강수량 추세와 더 잘 일치하는 결과를 보여주었다. 이러한 결과를 토대로 한반도에서의 증발산 추세 연구에 있어 한반도지표자료동화의 활용 가능성이 클 것으로 기대된다.

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http://www.fluxnet.ornl.gov/ (2010. 8. 8)

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