서로 다른 격자 해상도를 가지는 모형의 전지구 해양-해빙 수치실험 비교

Abstract

To investigate the changes in the features of the upper ocean with the enhancement of horizontal grid resolution, global ocean circulations are simulated using the two different grid resolution models based on the GFDL ocean-sea ice coupled model, MOM4p1-SIS. The two models use roughly 1 degree x 1 degree (GCM_1) and 0.5 degree x 0.5 degree (GCM_0.5) grid resolution, respectively, except in the equatorial region where more refined grid spacing is taken in meridional direction. Both model employ the common atmospheric data (radiation, wind, air temperature, specific humidity, sea level pressure, precipitation and land runoff) from the CORE-II normal year forcing dataset and adopt the same numerical schemes in tracer and momentum advection and diffusion with the same coefficients of eddy viscosity and eddy diffusivity between them. After 120 years of integration GCM_1 shows warm biases compared to the observation in the sea surface temperature at the equatorial Western Pacific, Asian Marginal Seas, west off South American coast and several other areas in the Pacific Ocean, including other major areas in the Atlantic, Indian and Southern Oceans. It also shows cold biases at those areas such as the central part of the subtropical gyre in the North Pacific and most of the North Atlantic and Greenland Sea. Compared to GCM_1 GCM_0.5 reveals some improved SST patterns showing much reduced warm- anpled model, MOM4p1-SIS. The two models use roughly 1 degree x 1 degree (GCM_1) and 0.5 degree x 0.5 degree (GCM_0.5) grid resolution, respectively, except in the equatorial region where more refined grid spacing is taken in meridional direction. Both model employ the common atmospheric data (radiation, wind, air temperature, specific humidity, sea level pressure, precipitation and land runoff) from the CORE-II normal year forcing dataset and adopt the same numerical schemes in tracer and momentum advection and diffusion with the same coeffici