1951—2000年间冬季黄海暖流变异的数值研究  

Numerical Simulation of the Variations of the Yellow Sea Warm Current During 1951-2000

作　　者：塔娜[1,2] 方越[1,2] 孙双文[1,2] 王辉武[1,2] 刘延亮[1,2] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]海洋与气候研究中心,山东青岛266061

出　　处：《海洋科学进展》2014年第2期130-140,共11页Advances in Marine Science

基　　金：国家重大科学研究计划--热带太平洋印度洋环流及其热输送对全球变暖的响应(2012CB95560);中国科学院战略先导科技专项--中国邻近大洋百年热力状况对中国气候的影响(XDA05090404);国家自然科学基金--热带太平洋-赤道大西洋遥相关多年代际变化的研究(41176030);中央级公益性科研院所基本科研业务费专项--南黄海热通量的观测分析和SST日变化;季节变化的机理研究(GY2009G17)

摘　　要：通过二维正压数值模式,分别模拟了黄海1951—2000年间两个代表时间段冬季的环流状况。对比这两个时间段的环流,发现冬季黄海暖流及沿岸流存在着显著的变异。主要表现为:(1)在1951—2000年期间,黄海暖流和沿岸流都呈现明显的减弱趋势并且黄海暖流的主轴发生西移;(2)黄海暖流及沿岸流的减弱致使环流异常在黄海中部和西部形成了一个海盆尺度的反气旋环流圈,而在黄海东部形成一个弱的气旋式环流异常。进一步分析发现,环流的异常与冬季风风应力经水深平均后变异的旋度场吻合良好,表明冬季风场的变异和黄海水深分布是决定黄海环流变异特征的主要因子。1977—2000年间,在36°N断面观测到的海表温度锋面强度的减弱趋势也很好的验证了数值模式所得出的结果。The variations of wintertime circulations in the Yellow Sea in two representative periods of time during 1951--2000 are respectively simulated by using a two-dimensional barotropical numerical model. Comparing the circulations in the two representative periods of time, it is found that the Yellow Sea Warm Current （YSWC） and the coastal current vary significantly in winter. This is mainly indicated by （1） both the YSWC and the coastal current showed a trend of weakening during 1951--2000 and the axis of the YSWC shifted westward, and （2） the weakening of the two currents lead to the circulation anomalies forming a basin-sized anticyclonic gyre in the central and western parts of the Yellow Sea, while in the eastern part of the sea forming a relatively weak cyclonic gyre. Further analyses demonstrate that the pat- tern of the anomalous circulations corresponds well to that of the vorticity field formed by the wind stress of winter monsoon after averaged by water depth, indicating that the variations of winter monsoon and the distributions of water depth in the Yellow Sea are the major factors determining the variations of the YSWC. The results from the numerical simulation with the model are verified well by the weakening trend of the surface temperature front observed along the 36°N section during 1977-2000.

关 键 词：黄海暖流 变异 冬季风 数值模式 锋面 

分 类 号：P731.27[天文地球—海洋科学]