低纬平均经圈环流异常与海表温度异常关系的诊断分析  

DIAGNOSTIC ANALYSES OF MEAN MERIDIONAL CIRCULATION ANOMALY IN LOW LATITUDE IN RELATION TO THAT OF ZONAL MEAN SST

作　　者：程亚军[1] 王盘兴[1] 李丽平[1] 

机构地区：[1]南京气象学院,江苏南京210044

出　　处：《热带气象学报》2002年第3期193-202,共10页Journal of Tropical Meteorology

基　　金：国家自然科学资金项目(49975025)资助

摘　　要：利用NCEP/NCAR的40 年大气再分析资料中的月平均经向风速及垂直速度,计算了纬向平均经圈环流的质量流函数,分析了纬向平均的海表温度和纬向平均的经圈环流的气候态及异常态特征。结果表明,(1)南、北半球Hadley 环流圈的共同上升支偏于赤道附近的夏半球一侧,与[]SST极大值位置相对应;强下沉支位于冬半球一侧;(2)El Nino 事件中低纬[]SST是异常经圈环流产生的重要外强迫源,但其影响程度受基本气流和[]SST及[]SST的季节变化和年际差异的影响甚大。The mass stream function of zonal mean meridinal circulation is calculated in terms of NCEP/NCAR monthly meridional wind- and vertical- velocity, and the climatic and anomalous features of zonal mean -SST and -meridinal circulation is investigated. Results show that (1)the joint ascending branch of Northern and Southern Hadley circulation is side of the summer hemisphere near the equator, being well consistent with the extremum of []SST , and the strong descending by the winter side. (2) El Nino-related ][SST in the low latitude is an important outer-forcing source for anomaly meridinal circulation, which is affected by seasonal variation of basic air flow and []SST, and interannual and interdecadal changes of []SST.

关 键 词：经圈环流 海表温度 质量流函数 SST 大气环流 季节变化 

分 类 号：P732.6[天文地球—海洋科学]