南太平洋副热带偶极子对南太平洋辐合带的影响  

Influence of the South Pacific Subtropical Dipole on the South Pacific Convergence Zone

作　　者：李琼[1,2,3,4] 郑建[1,3,4] 王法明[1,3,4] 

机构地区：[1]中国科学院海洋研究所,山东青岛266071 [2]中国科学院大学,北京100049 [3]中国科学院海洋研究所海洋环流与波动重点实验室,山东青岛266071 [4]青岛海洋科学与技术国家实验室海洋动力过程与气候功能实验室,山东青岛266071

出　　处：《海洋科学》2016年第10期143-150,共8页Marine Sciences

基　　金：中国科学院战略性先导科技专项(XDA11010102);国家自然科学基金项目(41176017;41421005;41606018);国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目(U1406401)~~

摘　　要：为研究南太平洋副热带偶极子的局地气候效应,利用Hadley中心的海温数据集Had ISST以及NCEP-NCAR的大气再分析数据,分析了南太平洋副热带偶极子（South Pacific Subtropical Dipole,SPSD）对南太平洋辐合带（South Pacific Convergence Zone,SPCZ）的影响,并探讨了相应的物理过程。研究结果显示,南太平洋副热带偶极子事件线性独立于ENSO（El Niao-Southern Oscillation）事件,有明显的季节锁相,于12-2月达到峰值并显著影响SPCZ降水带的位置。其中,正偶极子事件（简称＂正事件＂）期间偶极子东北极区域（暖海温）水汽辐合上升,降水增多;而在偶极子西南极区域（冷海温）水汽辐散下沉,降水减少,因此SPCZ降水带偏北。负偶极子事件（简称＂负事件＂）则相反,东北极降水减少的同时西南极降水增多,从而SPCZ降水带偏南。本研究关于SPSD与SPCZ关系的分析,将有助于更好地理解南太平洋的年际气候变异和海气相互作用。This study analyzes the influence of the South Pacific Subtropical Dipole（SPSD） on the South Pacific Convergence Zone（SPCZ） and explores its dynamic processes by using SST data Had ISST from the Hadley center and atmospheric reanalysis NCEP-NCAR data. Analysis shows that the SPSD is linearly independent of ENSO and shows strong phase locking peaks in summer（December January February）. The location of the SPCZ precipitation is significantly affected by an SPSD event. The northeast pole（warmer SST） has a positive precipitation anomaly because of lower pressure and moisture convergence in this area during positive dipole event（referred to as positive event） years. However, the southwest pole（cooler SST） with its higher pressure is dominated by a divergence of moisture resulting in less precipitation. Therefore, the SPCZ precipitation zone moves to the north and the location of precipitation is opposite during a negative dipole event（referred to as negative event）, which has less precipitation in northeast pole area and more precipitation in southwest pole area. Therefore, the SPCZ precipitation zone moves to the south. The results of this study provide more knowledge on the relationship between SPSD and SPCZ and help to better understand annual climate change and air–sea interaction in South Pacific.

关 键 词：南太平洋副热带偶极子 南太平洋辐合带 海面温度 降水 大气环流 

分 类 号：P47[天文地球—大气科学及气象学]