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利用一个全球海气耦合模式长期积分所给出的资料,分析了冬季北太平洋海表湍流热通量(潜热和感热)异常及其对海表温度(SST)异常的影响,并比较了海表热通量诸分量和海洋内部的动力学过程对SST变化的相对重要性。结果表明,冬季热带外海洋上的湍流热通量是影响SST的主要因子,但在北太平洋中部海水的平流作用也不可忽视。冬季热带外海洋向大气释放的潜热和感热通量与SST倾向(而不是SST本身)之间存在着显著的相关,这同Cayan和Reynolds等利用COADS资料和NCEP资料同化模式分析的结果是一致的。模式诊断的结果支持这样一种看法:和热带海洋不同,冬季热带外海洋上的海气相互作用主要地表现为大气对海洋的强迫作用,而不是相反。模式给出的SST倾向的第一个EOF分量及其与海平面气压场的相关特征同Walace等从观测资料分析所得到的结果是一致的;进一步的分析表明:在冬季北太平洋的大部分区域(特别是西太平洋),大尺度大气环流异常在很大程度上决定着SST的异常,而这种决定作用正是通过它对湍流热通量的强烈影响来实现的。
Based on the data from a long-term integral of global ocean-atmosphere coupling model, the paper analyzes the anomalies of the turbulent heat flux (latent heat and sensible heat) and their effects on the sea surface temperature (SST) anomalies in the North Pacific during the winter and compares the effects of the sea The relative importance of the heat flux components and the dynamics of the ocean interior to SST changes. The results show that the turbulent heat flux over the winter tropical oceans is a major factor affecting SST, but the advection of seawater in the central North Pacific Ocean can not be neglected. There is a significant correlation between latent heat and sensible heat flux released by the ocean to the atmosphere over winter tropics and SST propensity rather than SST per se, consistent with the results of Cayan and Reynolds et al. Using COADS data and NCEP data assimilation mode analysis of. The results of pattern diagnostics support the notion that unlike the tropical oceans, the air-sea interaction on the oceans outside the winter tropics predominantly represents the forcing of the atmosphere on the oceans, rather than the opposite. The first EOF component of the SST trend given by the model and its correlation with the sea level pressure field are consistent with the results from Walace et al.’s analysis of the observed data. Further analysis shows that during the winter most of the North Pacific (Especially in the western Pacific), the large-scale atmospheric circulation anomalies largely determine the SST anomaly, and this determinative effect is achieved through its strong influence on the turbulent heat flux.