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通过参数化次表层上卷海温改进了一个热带太平海洋模式的SSTA模拟。这种参数化方案通过经验方法将海洋上混合层底部海温变化与海表面起伏联系起来,从而可以方便地利用模式模拟的海表起伏描述温跃层的变化情况及其对混合层海温变化的影响。三组数值试验表明通过上述方法显著改善了SST年际变化的模拟,与观测相比,在赤道东太平洋及南美沿岸,距平相关系数由原来的0.7左右提高到0.8以上,均方根误差在赤道东太平洋由原来0.8℃降到0.6℃,在南美沿岸由1.3℃以上降为0.9℃。这表明在赤道东太平洋及南美沿岸,温跃层的变化通过夹卷过程及垂直扩散过程可以显著影响混合层的温度,OGCM对这些过程描述不足是导致SST年际变化模拟偏弱的一个重要原因,通过强调这些过程可以改善模拟效果。同时在热带西太平洋的改进也是显著的。
SSTA simulations of a tropical Pacific ocean model have been improved by parametrizing subsurface sea surface temperature. This parametric scheme empirically approximates the variations of sea surface temperature at the bottom of the ocean mixed layer with sea surface fluctuations so that the model simulations of sea surface fluctuation can be used to describe the variation of the thermocline and its effect on the variation of the sea surface temperature Impact. Three sets of numerical experiments show that the simulation of interannual variation of SST is significantly improved by the above method. Compared with the observation, the anomaly correlation coefficient increases from about 0.7 to 0.8 in the eastern equatorial Pacific and the coast of South America. The root mean square error The eastern equatorial Pacific dropped from 0.8 ° C to 0.6 ° C and from 1.3 ° C to 0.9 ° C on the South American coast. This shows that in the eastern equatorial Pacific and the coast of South America, the change of thermocline can significantly affect the temperature of the mixed layer through the rolling process and the vertical diffusion process. OGCM’s inadequate description of these processes is an important reason for the weak simulation of the interannual variation of SST , By emphasizing these processes can improve the simulation results. At the same time, improvements in the tropical western Pacific are also significant.