摘要
本文利用NCAR/NCEP资料,对发生在青海东部农业区的一次区域性大到暴雨过程进行了诊断分析。结果表明,本次暴雨天气过程主要受西伸到青藏高原东部的副热带高压及500 hPa风场上冷空气入侵青藏高原北部的影响。热低压中的上升气流与冷锋后的下沉气流构成纬向闭合环流,青藏高原热低压中的上升气流与副热带高压中的下沉气流形成径向闭合环流,垂直闭合环流的形成提供了源源不断的暖湿气流和稳定的上升气流,持续的降水造成了暴雨天气。副热带高压外围强盛的西南气流的稳定维持使得充足的水汽输送到青藏高原东部暴雨地区。
This paper used NCAR/NCEP data to conduct a diagnostic analysis of a regional heavy rainstorm process that occurred in the agricultural area of eastern Qinghai.The results showed that the rainstorm process was mainly af⁃fected by the subtropical high extending to the east of the Qinghai-Tibet Plateau and the cold air invading the north⁃ern Qinghai-Tibet Plateau on the 500 hPa wind field.The rising air flow in the hot low pressure and the sinking air flow after the cold front formed a closed loop in the weft direction,the ascending air current in the thermal depression of the Qinghai-Tibet Plateau and the subsidence air current in the subtropical high pressure formed a radial closed loop,the formation of a vertically closed circulation provided a continuous flow of warm and humid air and a steady upward airflow,and continuous precipitation caused heavy rain.The steady maintenance of the strong southwest air⁃flow around the subtropical high allowed sufficient water vapor to be transported to the rainstorm area in the eastern Qinghai-Tibet Plateau.
作者
曹晓敏
金凯
马海超
尤桑杰
CAO Xiaomin;JIN Kai;MA Haochao;YOU Sangjie(Qinghai Meteorological Observatory,Xining Qinghai 810001;School of Geographic Science,Qinghai Normal University,Xining Qinghai 810008;Qinghai Provincial Key Laboratory of Physical Geography and Environmental Processes,Qinghai Normal University,Xining Qinghai 810008;The Key Laboratory of Ministry of Education of Surface Processes and Ecological Conservation of the Qinghai-Tibet Plateau,Qinghai Normal University,Xining Qinghai 810008;Meteorological Bureau of Huangnan Tibetan Autonomous Prefecture,Tongren Qinghai 811300)
出处
《河南科技》
2020年第11期156-158,共3页
Henan Science and Technology
关键词
暴雨
等熵位涡
不稳定能量
垂直运动
rainstorm
isentropic potential vortex
unstable energy
vertical motion
