전지구 해양순환실험에서 격자해상도의 강화 효과

Abstract

Global ocean circulation is simulated and compared using two different configurations of horizontal grid resolution in the global coupled ocean-sea ice model MOM4-SIS. The two model versions adopt roughly 1×1º (GCM_1) and 0.5×0.5º (GCM_0.5) grids respectively, with enhanced latitudinal resolution in the equatorial region. Both model versions employ the common CORE-II normal year forcing data for radiation, wind, air temperature, specific humidity, sea level pressure, precipitation and land runoff, and the same numerical schemes for tracer/momentum advection/diffusion, with the same coefficients of eddy viscosity and eddy diffusivity. After 1000 years of integration GCM_1 shows warm biases in sea surface temperature (SST) in the equatorial Western Pacific, Asian Marginal Seas, west of the South American coast and other major areas of the world ocean. Compared to GCM_1, GCM_0.5 reveals some improved SST patterns after 500 years of integration, showing much reduced warm- and cold-biased regions at the above mentioned areas. It is likely that the different temperature patterns of GCM_0.5 compared to GCM_1 is due to the more finely resolved current structures in the coastal and western boundary current regions.0.5) grids respectively, with enhanced latitudinal resolution in the equatorial region. Both model versions employ the common CORE-II normal year forcing data for radiation, wind, air temperature, specific humidity, sea level pressure, precipitation and land runoff, and the same numerical schemes for tracer/momentum advection/diffusion, with the same coefficients of eddy viscosity and eddy diffusivity. After 1000 years of integration GCM_1 shows warm biases in sea surface temperature (SST) in the equatorial Western Pacific, Asian Marginal Seas, west of the South American coast and other major areas of the world ocean. Compared to GCM_1, GCM_0.5 reveals some improved SST patterns after 500 years of integration, showing much reduced warm- and cold-biased regions at the above mentioned areas. It is likely that the different temperature patterns of GCM_0.5 compared to GCM_1 is due to the more finely resolved current structures in the coastal and western boundary current regions.