1998年嫩江、松花江流域持续性暴雨的环流条件  

A Study of Excessively Heavy Rainfall in the Songhuajiang-Nenjiang River Valley in 1998

作　　者：张庆云[1] 陶诗言[1] 张顺利[1] 

机构地区：[1]中国科学院大气物理研究所,北京100080

出　　处：《大气科学》2001年第4期567-576,共10页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划G1998040900项目

摘　　要：利用 ＮＣＥＰ／ ＮＣＡＲ再分析资料，分析了 １９９８年夏嫩江、松花江流域持续性暴雨的环流条件及其演变特征。造成１９９８年夏嫩江、松花江流域持续性暴雨的环流条件是：东亚高纬地区的阻塞形势和嫩江、松花江流域上空的低压系统及大的水汽辐合中心，这三个条件长时间的维持造成 １９９８年夏嫩江、松花江流域出现了持续性暴雨。东南风水汽输送通道对嫩江、松花江流域水汽通量辐合的加强有较大的贡献。研究指出：当一个移动性的高空短波槽缓慢地绕着长波脊或阻塞高压移动，尤其是当一个切断低压闯入阻塞高压或在阻塞高压南侧移动时，往往引起暴雨，这种低压系统很可能是暴雨的制造者。It presents a study of the large-scale atmospheric circulation during the excessively heavy rainfall in the Songhuajiang-Nenjiang River valley in 1998. The excessively heavy rainfall in the Songhuajiang-Nenjiang River valley developed and persisted in association with three salient features. First, there was a steady blocking high with a long period of two months in the high latitudes over East Asia. second, during June to August the abundant moist airflows arrived at the songhuajiangNenjiang River valley. Third, the low pressure occurred between 40-50°N and there were four centers of the low pressure through the Songhuajiang-Nenjiang River valley from 20 July to 14 August. The concurrence of all these factors brought about persistence heavy and rainfalls, thus leading to flood disasters in the Songhuajiang-Nenjiang River valley.

关 键 词：松花江流域 持续性暴雨 环流条件 1998年 嫩江流域 水汽通量辐合中心 

分 类 号：P458.121.1[天文地球—大气科学及气象学]