热带对流活动、双元态结构及其在厄尔尼诺年的异常  

TROPICAL CONVECTIVE ACTIVITY AND DUAL-ELEMENT STATE WITH ANOMALY IN THE EL-NINO YEAR

作　　者：潘益农[1] 陆菊中[1] 徐建军[2] 

机构地区：[1]南京大学 [2]南京气象学院

出　　处：《南京气象学院学报》1993年第3期283-287,共5页Journal of Nanjing Institute of Meteorology

摘　　要：运用1979—1984年的向外长波辐射(OLR)资料分析了热带对流活动的周期变化特征、水平结构、30—50天振荡的活动特点,并详细讨论了冬季对流活动在厄尔尼诺年(1982年)的异常。研究指出:对流的季节平均活动能反映出气候系统的双元态特征;对流的扰动活动不具有双元态特征。在厄尔尼诺年的东太平洋地区,扰动活动相对增强,但在日界线以西同样具有扰动活动中心。对流的30—50天振荡在赤道上具有自西向东的纬向传播,厄尔尼诺年传播可以通过日界线到达东太平洋地区,而正常年传播一般在日界线以西的地区出现截陷。The features of the periodical variation in the tropical convective activity, its horizontal structure and the 30—50 day oscillation were analyzed with the 1979—1984 outgoing longwave radiation (OLR) data, and the anomaly of winter convection in the El Nino year (1982) was discussed in detail. Results show that the feature of the dual—element state of climate system could be reflected by the seasonal mean activity of convection. The convective disturbance is not marked by a dualelement state but it becomes relatively strengthened in the eastern Pacific during thd El Nino year, yet with a center of action of the disturbance west of the dateling. The 30—50 day oscillation of the convection travels eastward along the equator, crossing the dateline into the eastern Pacific in the El Nino year and trapped to the west in normal years in general.

关 键 词：对流活动 振荡 厄尔尼诺 热带对流 

分 类 号：P732.6[天文地球—海洋科学]