摘要: |
本文将利用常规探测资料、NCEP再分析资料和多普勒雷达资料,对2018年12月29~30日铜仁市暴雪过程的环流形势特征与成因进行分析,结果表明:此次暴雪过程发生在高空南支槽、多波动槽东移、700hPa西南暖湿急流输送及850hPa东北回流冷垫的环流背景下,表现出持续时间长、范围广、强度大、积雪深的特征;强降雪阶段对流层低层有来自孟湾的源源不断的水汽输送,湿层厚度增强,且有较强的水汽辐合;700hPa较强的垂直上升运动及对流层中低层较强的垂直风切变利于暴雪天气的发生;强降雪时刻暴雪区800hPa以上位于高层冷平流、低层暖平流的叠加区域,为不稳定大气;此次降雪具有对流性和持续性特征,雷达反射率回波云团具有列车效应。 |
关键词: 暴雪;南支槽;水汽输送;西南急流;东北回流 |
DOI: |
投稿时间:2019-11-29修订日期:2020-04-01 |
基金项目: |
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Analysis of a rare blizzard process in Tongren, Guizhou |
Ran Xianguo |
(Meteorological Bureau of Yanhe County) |
Abstract: |
This article will use conventional survey data, NCEP reanalysis data, and Doppler radar data to analyze the circulation situation characteristics and causes of the snowstorm process in Tongren City on December 29-30, 2018. The results show that this snowstorm process occurred Under the background of the circulation of the high altitude south branch trough, multi-fluctuation trough eastward, 700hPa southwestern warm and wet rapids transport, and 850hpa northeast return cold pad, it has the characteristics of long duration, wide range, high intensity, and deep snow; strong snowfall stage The lower layer of the troposphere has a steady stream of water vapor transport from the Meng Bay, the thickness of the wet layer is enhanced, and there is a strong water vapor convergence; the strong vertical ascending movement of 700 hpa and the strong vertical wind shear in the middle and lower layers of the troposphere are conducive to the occurrence of snowstorm weather ; Cold advection over the blizzard area at the time of heavy snowfall superimposed on low-level warm advection, near 800hpa is the intersection of cold and warm advection; this snowfall has convective and continuous characteristics, and the radar reflectivity echo cloud has train effect. |
Key words: Blizzard; South Branch Trough; Water Vapor Transport; Southwest Rapids; Northeast Return |