西太平洋暖池次表层海温异常与ENSO循环的相互作用  

Interactions between Subsurface Ocean Temperature Anomalies in the Western Pacific Warm Pool and ENSO Cycle

作　　者：穆明权[1] 李崇银[1] 

机构地区：[1]中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京100029

出　　处：《大气科学》2000年第4期447-460,共14页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目!G1 9980 4 0 90 0项目第一部分;国家自然科学基金资助项目!4 963 51 80;4 982 3 0 0 2资助

摘　　要：利用 1 964～ 1 993年的太平洋次表层海温资料 ,进一步分析研究了西太平洋暖池次表层海温异常与ENSO循环的关系。合成及相关分析的结果进一步表明 ,西太平洋暖池次表层海温的暖 (冷 )异常及其东传对ENSO的发生起着十分重要、且更直接的作用。然而 ,赤道西太平洋异常纬向风是造成次表层海温异常东传的重要原因 ,而纬向风的异常又是由于东亚冬季风异常活动所引起的 ,这间接地说明了异常东亚冬季风对西太平洋暖池次表层海温距平东传的重要作用。通过研究还发现 ,ENSO发生后 ,北半球副热带地区将有次表层暖 (冷 )海温距平沿着 1 0～ 2 0 oN纬带西传 ,这是导致西太平洋暖池次表层海温发生异常的重要原因之一。也就是说 ,西太平洋暖池次表层海温异常与ENSO循环之间是相互影响、相互作用的。This paper further studies relationship between anomalies of subsurface ocean temperature in the western Pacific Ocean warm pool and ENSO cycle. Results of composite and correlation analyses disclose that anomalies of subsurface ocean temperature in the warm pool and their eastward propagation have very important and direct effects on the occurrence of ENSO. Actually, the anomalous zonal wind at the equatorial western Pacific is the main force to push the anomalies of subsurface ocean temperature in the warm pool to propagate and expand eastwards. However, the anomalously zonal wind is the result of the anomalous winter monsoon in East Asia in our previous studies. So, it clearly reflects the indirect but important influence of the anomalous winter monsoon in East Asia on the eastward-propagation of the subsurface ocean temperature anomalies in the western Pacific warm pool. Through further analyses, we also find that the anomalies of subsurface ocean temperature propagate westwards and come back from the eastern Pacific Ocean to the warm pool along 10～20 o N after ENSO occurrence, and cause subsurface ocean temperature anomalies in the warm pool. Therefore, the anomalies of subsurface ocean temperature in the western Pacific warm pool strikingly interact with ENSO cycle.

关 键 词：西太平洋 暖池 ENSO循环 次表层 海温异常 

分 类 号：P732.6[天文地球—海洋科学]