Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Assessment of Noah land surface model-based soil moisture using GRACE-observed TWSA and TWSC

GRACE 관측 TWSA와 TWSC를 활용한 Noah 지면모형기반 토양수분 평가

  • Chun, Jong Ahn (Climate Analytics Department, Cliamte Services and Research Division, APEC Climate Center) ;
  • Kim, Seon Tae (Climate Analytics Department, Cliamte Services and Research Division, APEC Climate Center) ;
  • Lee, Woo-Seop (Climate Analytics Department, Cliamte Services and Research Division, APEC Climate Center) ;
  • Kim, Daeha (Climate Analytics Department, Cliamte Services and Research Division, APEC Climate Center)
  • 전종안 (APEC 기후센터, 기후사업본부 기후분석과) ;
  • 김선태 (APEC 기후센터, 기후사업본부 기후분석과) ;
  • 이우섭 (APEC 기후센터, 기후사업본부 기후분석과) ;
  • 김대하 (APEC 기후센터, 기후사업본부 기후분석과)
  • Received : 2020.02.24
  • Accepted : 2020.03.18
  • Published : 2020.04.30
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Abstract

The Noah 3.3 Land Surface Model (LSM) was used to estimate the global soil moisture in this study and these soil moisture datasets were assessed against satellite-based and reanalysis soil moisture products. The Noah 3.3 LSM simulated soil moistures in four soil layers and root-zone soil moistures defined as a depth-weighted average in the first three soil layers (i.e., up to 1.0 m deep). The Noah LSM soil moisture products were then compared with a satellite-based soil moisture dataset (European Space Agency Climate Change Initiatives (ESA CCI) SM v04.4) and reanalysis soil moisture datasets (ERA-interim). In addition, the five major basins (Yangtze, Mekong, Mississippi, Murray-Darling, Amazon) were selected for the assesment with the Gravity Recovery and Climate Experiment (GRACE)-based Total Water Storage Anomaly (TWSA) and TWS Change (TWSC). The results revealed that high anomaly correlations were found in most of the Asia-Pacific regions including East Asia, South Asia, Australia, and Noth and South America. While the anomaly correlations in the Murray-Darling basin were somewhat low, relatively higher anomaly correlations in the other basins were found. It is concluded that this study can be useful for the development of soil moisture based drought indices and subsequently can be helpful to reduce damages from drought by timely providing an efficacious strategy.

이 연구에서는 Noah 3.3 지면모형을 이용하여 표층과 근역층(root-zone)의 토양함수비를 추정하고, 이를 위성기반 및 재분석 토양수분자료와 비교·검증하였다. 먼저, Noah 3.3 지면모형으로부터 추정한 4개 토양층 중 지면에 가까운 3개층(즉, 표층으로부터 1 m 깊이까지) 토양함수비를 이용하여 3개층의 깊이 가중평균값을 근역층 토양 함수비로 정의하였다. 이렇게 Noah 3.3 지면모형으로 추정한 토양함수비를 위성기반 표층 토양 함수비(European Space Agency Climate Change Initiatives Soil Moisture Product v04.4, ESA CCI SM v04.4)와 ERA-interim 재분석 표층 및 근역층 토양함수비와 비교·검증하였다. 또한, 전지구의 주요 5개 유역(Yangtze, Mekong, Mississippi, Murray-Darling, Amazon)에 대해 Gravity Recovery and Climate Experiment (GRACE) 관측 Total Water Storage Anomaly (TWSA) 와 TWS Change (TWSC)를 이용하여 비교·검증하였다. Noah 3.3 지면모형으로 산정한 토양수분 자료는 동아시아 지역과 남아시아 지역, 호주, 북미와 남미 등 대부분의 아시아·태평양지역에서 높은 아노말리 상관관계를 보였으며, 5개 유역에서 호주의 머레이-달링(Murray-Darling)유역에서 다소 낮은 상관관계를 보였으나, 나머지 4개 유역에서는 대체로 높은 상관성을 보였다. Noah 3.3 지면모형은 준실시간 토양수분 모의가 가능하기 때문에 이에 기반한 가뭄감시가 가능하며, 선제적 가뭄 대응 대책 마련에 활용성이 클 것으로 기대된다.

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