郑州极端高温天气成因分析  

Reason for Extreme High Temperature in Zhengzhou, Henan Province

作　　者：贺哲 李平 乔春贵 王蕊 梁钰 谷秀杰 

机构地区：[1]河南省气象台,郑州450003

出　　处：《气象》2007年第3期68-75,共8页Meteorological Monthly

摘　　要：采用NCEP/NCAR1°×1°格点资料对2005年6月22—23日郑州出现的40℃以上的极端高温天气成因进行了分析。指出,河套高压是初夏导致郑州乃至黄淮地区西部出现极端高温的重要天气系统。河套高压的形成与高低层暖平流存在着联系。同时高温的产生也与副热带急流有关,河套高压东南侧的强下沉气流是热力和动力共同作用结果,即当河套高压东南部处于高层副热带急流入口区左侧时,动力辐合机制使得此区域的下沉气流极为强盛,由此所产生的晴空辐射增温和下沉绝热增温使得极端高温天气的出现成为可能。另外,地形所产生的焚风效应对高温的形成具有增幅作用。The extremely high temperature（≥40℃ ） that occurred in Zhengzhou during 22-23, June 2005 is analyzed by utilizing the 1°×1°grided data of NCEP/NCAR. The results show that the Hetao high is an important synoptic system that caused the extreme hot weather in Zhengzhou and even the western part of the Huang- Huai region. The generation of the Hetao high is concerned with the warm advection at various levels. The appearance of the extremely high temperature is also related to the upper level subtropical jet stream. The strong descending air flow in the southeastern part of the Hetao high is caused by both thermodynamic and dynamic factors. That is, when the southeastern part of Hetao high lies in the left side of entrance region of the upper level subtropical jet stream, dynamic convergence makes the descending movement of air flow in this region more powerful. The consequential clear radiation heating and adiabatic warming because of air sinking benefit the occurrence of extremely high temperature. In addition, the foehn effect generated by topography can be of a role of intensifying the extreme high temperature.

关 键 词：极端高温 河套高压 副热带急流 

分 类 号：P458.121.1[天文地球—大气科学及气象学]