沃克环流上升区赤道低空强西风带的分析  

AN ANALYSIS ON THE CHARACTERISTICS OF THE STRONG WESTERLY WIND BELT AT THE LOWER LEVEL AT THE UPLIFTED AREA OF WALKER CIRCULATION

作　　者：李若钝[1] 于惠苓[1] 刘丽惠[1] 孙瑞本[1] 井传才 苏新锁 

机构地区：[1]国家海洋局第一海洋研究所,青岛市气象局,中国气象科学研究院

出　　处：《热带海洋》1995年第1期38-45,共8页

摘　　要：采用ＴＯＧＡ／ＣＯＡＲＥ国际合作考察期间（１９９２年１０月─１９９３年２月）获得的２６７次定点（２°Ｓ，１５５°Ｅ）定时高空大气探测资料，进行计算分析，发现１９９２年１２月─１９９３年２月低空存在一支西风急流，有两次分别持续半月之久，而１９９２年１１月的两次赤道西风急流，因无赤道高空急流配合，仅持续２ｄ便消失。本文还指出：（１）赤道低空西风急流是各种海－气指数产生ＥＮＳＯ异常的重要信息；（２）赤道高空急流有滞后赤道低空急流２ｄ左右的响应关系；（３）赤道低空急流是纬向水汽输送的狭窄通道。Based on the time series of explorational data of the upper atmosphere at the uplifted area of Walker circulation (2°S, 155°E) obtained from international TOGA-COARE project,the vertical variations of temperature, humidity and wind parameters are analysed. The results show that the westerly jet flow at lower level of the atmosphere(below 7km)was discovered during Dec. 1992-Feb. 1993, the two processes of westerly jet flow persisted about 17 and 16 days and accounted for 68 and 59% of total observational days respectively. While the two processes of jet flow in Nov. of 1992 both only maintained two days and accounted for 25 % of total observational days.It is also pointed out from the study that:(1)the westerly jet flow at lower level of the atmosphere was closely related to ENSO event.(2)the jet flow was strong and lasted for long period if the jet flow at upper level of the atmosphere was coincident with that at lower level of the atmosphere.(3)the jet flow at lower level of the atmosphere was a main path for zonal water vapour transportation.

关 键 词：西风带 赤道低空 西风急流 沃克环流 

分 类 号：P458.123[天文地球—大气科学及气象学]