Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Analyzing off-line Noah land surface model spin-up behavior for initialization of global numerical weather prediction model

전지구수치예측모델의 토양수분 초기화를 위한 오프라인 Noah 지면모델 스핀업 특성분석

  • Jun, Sanghee (Numerical Modeling Center, Korea Meteorological Administration) ;
  • Park, Jeong-Hyun (Numerical Modeling Center, Korea Meteorological Administration) ;
  • Boo, Kyung-On (Numerical Modeling Center, Korea Meteorological Administration) ;
  • Kang, Hyun-Suk (Numerical Modeling Center, Korea Meteorological Administration)
  • Received : 2020.01.29
  • Accepted : 2020.03.06
  • Published : 2020.03.31
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Abstract

In order to produce accurate initial condition of soil moisture for global Numerical Weather Prediction (NWP), spin-up experiment is carried out using Noah Land Surface Model (LSM). The model is run repeatedly through 10 years, under the atmospheric forcing condition of 2008-2017 until climatological land surface state is achieved. Spin-up time for the equilibrium condition of soil moisture exhibited large variability across Koppen-Geiger climate classification zone and soil layer. Top soil layer took the longgest time to equilibrate in polar region. From the second layer to the fourth layer, arid region equilibrated slower (7 years) than other regions. This result means that LSM reached to equilibrium condition within 10 year loop. Also, spin-up time indicated inverse correlation with near surface temperature and precipitation amount. Initialized from the equilibrium state, LSM was spun up to obtain land surface state in 2018. After 6 months from restarted run, LSM simulates soil moisture, skin temperature and evaportranspiration being similar land surface state in 2018. Based on the results, proposed LSM spin-up system could be used to produce proper initial soil moisture condition despite updates of physics or ancillaries for LSM coupled with NWP.

본 연구에서는 전지구수치예보모델의 예측성능에 주요한 영향을 주는 요소 중 하나인 토양수분 초기장을 적절히 생산하기 위해, 오프라인 Noah 지면모델을 구축하여 스핀업실험을 수행하고 그 변동특성을 살펴보았다. 스핀업실험은 지면기후장 생성과 목표연도에 대한 현실화의 2단계로 구성되었다. 첫 번째 단계의 지면기후장 생성은 2008~2017년 기간에 대해 평균한 대기강제력으로 10년 동안 지면모델을 반복적으로 수행하는 방식으로 이루어졌으며, 토양수분 모의가 평형상태에 도달하는데 소요되는 시간은 토양깊이와 코펜 정의에 기반한 기후구 특성에 따라 차이가 컸다. 토양 첫 번째 층은 극지역에서 가장 길었고, 두 번째 층 부터 네 번째 층까지는 건조지역에서 평형상태에 도달하는 시간이 가장 늦어 최대 7년 내외의 시간이 소요되었다. 결과적으로 10년의 spin-up을 거치면 지면모델이 평형상태에 도달함을 알 수 있다. 이 소요시간은 지상기온과 강수량과 음의 상관관계를 보였다. 두 번째 단계에서는 2018년을 목표연도로 설정하고 지면기후장을 이용하여 추가 적분을 수행하고, 그 결과 6개월 이내에 지면모델에서 모의된 토양수분, 지표기온, 증발산량은 2018년 지면상태에 도달하는 것을 확인하였다. 이에 구축된 오프라인 Noah 지면모델 스핀업 시스템은 안정적으로 전구수치예보모델의 토양수분 초기장을 생산함으로써 전지구수치모델에 결합된 지면모델의 물리과정과 기초자료가 변하더라도 유연하게 대응할 수 있는 가능성을 확인하였다.

Keywords

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