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중해상도 전지구 해양대순환 모형의 상층 수온과 혼합층 깊이 모사 성능 평가

Evaulation of Upper Ocean Temperature and Mixed Layer Depth in an Eddy-permitting Global Ocean General Circulation Model

장찬주|강석구|김철호|이흥재|민홍식
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)|2006.09|Ocean and Polar Research|제28권 제3호|pp. 245-258

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참고문헌

주제분류해양학

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Abstract

We investigated seasonal variations of the upper ocean temperature and the mixed layer depth (MLD) in an eddy-permitting global ocean general circulation model (OGCM) to assess the OGCM performance. The OGCM is based on the GFDL MOM3 which has a horizontalresolution of 0.5 degree and 30 vertical levels. The OGCM was integrated for 68 years using a monthly-mean climatological wind stress forcing. The model sea surface temperature (SST) and sea surface salinity were restored to the Levitus climatology with a time scale of 30 days. Annual-mean model SST shows a cold bias (< 2oC) in the summer hemisphere and a warm bias (> oC) in the winter hemisphere mainly due to the restoring boundary condition of temperature. The model MLD captures well the observed features in most areas, with a slightly deep bias. However, in the Ross Sea and Weddell Sea, the model shows significantly deeper MLD than the climatology--mainly due to weak salinity stratifications in the model. For amplitude of seasonal variation, the model SST is smaller (1~3oC) than the observation largely due to the restoring surface boundary condition, while the model MLD has larger seasonal variation (~50It is suggested that for more realistic simulation of the upper ocean structure in the present eddy-permitting ocean model, more refinements in the surface boundary condition for the thermohaline forcing and parameterization for vertical mixing are required, together with the incorporation of a sea-ice model.

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