怀化市一次大范围暴雪天气成因分析  

Analysis on the causes of a large-scale snowstorm in Huaihua City

作　　者：彭艳青[1] 张昆[1] 王起唤 陈红专[1] PENG Yanqing;ZHANG Kun;WANG Qihuan;CHEN Hongzhuan(Huaihua Meteorological Bureau,Huaihua 418000,China)

机构地区：[1]湖南省怀化市气象局,湖南怀化418000

出　　处：《贵州科学》2022年第2期71-75,共5页Guizhou Science

基　　金：湖南省短平快项目(XQKJ21B017)。

摘　　要：为提高对暴雪的预报能力,减少暴雪灾害损失,利用常规观测资料与NCEP(分辨率:1°×1°)再分析资料,对2018年12月29日至30日发生在怀化地区的一次大范围暴雪天气过程成因进行分析,结果表明:低层850 hPa至地面的冷垫使得充沛的水汽在中高层积累和凝结从而触发此次暴雪过程;700 hPa西南低空急流的维持和加强为暴雪过程提供充沛的水汽条件;500 hPa南支槽维持、东移和加深导致的大尺度强迫,是暴雪所需上升运动的主要来源之一;准静止锋稳定维持有利于垂直运动的发展;高空急流促进并加强了辐合上升运动,对暴雪有增幅作用;地面气压升至1040 hPa以上,850 hPa、700 hPa和500 hPa温度分别降至-9℃、-3℃和-14℃,是怀化出现暴雪天气的有利层结条件。In order to improve the forecast ability of snowstorm, and to reduce the loss of snowstorm disaster, the causes of a large-scale snowstorm in Huaihua City from 29 to 30,December, 2018 were analyzed by using conventional observation data and NCEP re-analysis data.The results showed that: the cold pad from 850 hPa to the ground had caused abundant water vapor to accumulate and condense in the upper and middle layers, thus triggering the snowstorm;the maintenance and enhancement of the 700 hPa southwest low-level jet had provided abundant water vapor for the snowstorm process;the large-scale forcing caused by the maintenance, eastward movement and deepening of the 500 hPa southward trough was one of the main sources of the ascent required by the snowstorm;the stability of the quasi-stationary front was beneficial to the development of the vertical motion;the upper-level jet had promoted and strengthened the convergence ascending movement, which had an increasing effect on the snowstorm;the ground pressure had risen above 1040 hPa, and the temperature of 850 hPa, 700 hPa and 500 hPa had descended to-9 ℃,-3 ℃ and-14 ℃,which were perfect conditions for the snowstorm in Huaihua.

关 键 词：怀化 大范围 暴雪 成因 

分 类 号：P426.63[天文地球—大气科学及气象学]