前期热带海温分布型对6月西北太平洋异常反气旋环流的影响  

POSSIBLE IMPACTS OF THE TROPICAL OCEAN SST ANOMALY ON THE NORTHWEST PACIFIC ANALYSIS ANTICYCLONE IN JUNE

作　　者：王庆元[1] 李琰[2] 张楠[1] 韩雪[3] 

机构地区：[1]天津市气象台,天津300074 [2]国家海洋信息中心,天津300171 [3]国家海洋环境预报中心,北京100081

出　　处：《热带气象学报》2013年第5期874-880,共7页Journal of Tropical Meteorology

基　　金：国家自然科学基金项目(41106004;41206013;41106159);国家海洋局青年海洋科学基金(2012223);国家海洋局公益性行业专项(201005019)共同资助

摘　　要：研究了前期热带海温分布型对6月西北太平洋异常环流的影响。结果表明,奇异值分解(SVD)的前期夏季、秋季至冬季热带海洋第一模态呈现出印度洋全海盆一致型海温异常和东太平洋西伸显著的ENSO事件,该模态与6月西北太平洋反气旋(气旋)环流场没有明显的关联。在第二模态中,前期热带太平洋海表温度呈现为ENSO正位相向负位相转换特征,印度洋海表温度变化呈现出赤道东南印度洋(90~110°E,10°S^0°)显著的准IOD事件的变化特征。而这一联合模态与6月西北太平洋异常反气旋(气旋)环流场有显著关联。关联的可能原因是前期海温为El Ni o和正IOD时,横跨热带印度洋-太平洋的沃克环流的减弱导致在西太平洋-海洋大陆的负降水异常,在Matsuno-Gill效应下西北太平洋形成反气旋异常环流。同时由于两大洋的共同作用和局地海气相互作用使得该环流加强并维持到6月。The paper studies the impact of preceding sea surface temperature anomalies （SSTA） of tropical oceans on Northwest Pacific Anomalous Anticyclone （NPAA） in June.The results are shown as follows.From the preceding summer to autumn and winter,the first mode （SVD1） of the tropical ocean displays a basin-wide SSTA in the Indian Ocean and the ENSO episode in which the eastern Pacific extends westward significantly.However,the first mode has no significant relationship with the circulation of NPAA in June.For the second mode （SVD2）,preceding SSTA of the tropical Pacific transforms from the positive phase of ENSO to the negative phase while the variation of SSTA of the Indian Ocean shows the features of a quasi-IOD episode.The association of these modes is significantly linked with the circulation of anomalous anti-cyclone （cyclone） in the western North Pacific in June.A possible reason for the linkage is that when the preceding SST is in E1 Ni（n）o and the positive phase of IOD,the Walker cell,stretching across the tropical Indian Ocean and Pacific Ocean,weakens to cause negative precipitation anomalies over the western Pacific and oceanic continent and form an anomalous anticyclone under the Matsuno-Gill effect in the western North Pacific.Due to the joint action by the two oceans and local air-sea interactions,this circulation gets strengthened and maintains until June.

关 键 词：西北太平洋反气旋环流 海气相互作用 印度偶极子 ENSO 

分 类 号：P732.6[天文地球—海洋科学]