摘要
通过对2006—2020年许昌地区大雪以上量级降雪过程及降水相态进行统计分析发现,许昌市大雪以上量级降雪过程有189次,其中94.2%发生在1月、2月和11月,64.0%发生在白天,76.2%为纯雪过程,年际变化较大,空间分布与地形关系密切。同时对10个大雪以上量级降雪的雨雪转换过程环流背景和探空资料进行分析,总结出许昌地区出现大雪以上量级降雪的雨雪转换过程主要环流形势,并制定出气温的雨雪转换判别指标,为许昌大雪以上量级降雪的雨雪转换预报提供参考。
Through the statistical analysis of snowfall above heavy snowprocesses and precipitation phase in Xuchang area from 2006 to 2020,it is found thatthere were 189snowfall above heavy snow processes in Xuchang Area,and the 94.2%of processes occurred in January,February and November,the 64.0%occurred during daytime,the 76.2%were pure snow processes.The annual variation of snowfall above heavy snowprocesses is large,and the spatial distribution of snowfall above heavy snowprocesses is closely related to topography.Based on the the analysis of the atmospheric circulation background and radiosonde data of 10 rain-snow conversion processes,the main atmospheric circulation situation of the rain-snow conversion process in Xuchang area is summarized,and the index of temperature in the process of rain-snow conversion is established.These can provide a reference for the forecasting of rainsnow conversion in Xuchang area.
作者
侯凯
HOU Kai(Meteorological Administration of Xuchang,Xuchang 461100,China)
出处
《河南科技》
2022年第10期101-105,共5页
Henan Science and Technology
基金
许昌市应用气象工程技术研究中心开放基金项目(XC201703)
中国气象局、河南省农业气象保障与应用技术重点实验室应用技术研究基金面上项目(KM202208)。
关键词
大雪
气候特征
雨雪转换
判别指标
heavy snow
climate characteristics
rain-snow conversion
discriminant index
作者简介
侯凯(1985-),女,本科,工程师,研究方向:中短期天气预报预警。
