2012—2019年昌吉冬季降雪日变化特征分析  

Characteristic of Daily Variation of Winter Snowfall in Changji Prefecture from 2012 to 2019

作　　者：蔡仁[1] 李璐 于永波[1] 阿来依·艾丁 苗运玲 CAI Ren;LI Lu;YU Yongbo;Alaiyi Aiding;MIAO Yunling(Urumqi Meteorological Bureau,Urumqi 830006,China;Xinjiang Meteorological Bureau,Urumqi 830002,China)

机构地区：[1]乌鲁木齐市气象局,新疆乌鲁木齐830002 [2]新疆维吾尔自治区气象台,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2024年第4期100-107,共8页Desert and Oasis Meteorology

基　　金：中国沙漠气象科学研究基金(Sqj2022018);新疆气象局创新发展专项面上项目(NS202322)。

摘　　要：利用2012-2019年冬季昌吉回族自治州(简称“昌吉州”)11个国家级台站逐时降水资料,运用常规统计方法,对昌吉州冬季降雪日变化特征进行分析。结果表明:昌吉州冬季降雪量空间分布与海拔高度呈正相关,与纬度呈显著的负相关,降雪强度与纬度关系密切。昌吉州逐时累积降雪量呈双峰型分布,主峰出现在17时,次峰出现在08时;西部呈三峰型特征,主次峰值分别出现在17、14、08时;东部呈准单峰单谷型,峰值发生在19时,谷值出现在13时。昌吉州冬季降水以短时降水事件为主,对冬季降水量贡献为64%,12 h以上长持续性降水事件发生概率很小,仅在部分台站偶有发生。西部和东部冬季降水日循环与降水持续性关系较密切,其中持续3~4 h降水事件对西部和东部冬季降水量贡献最大,随着持续时间的延长对降水量的贡献变小。Based on the hourly precipitation data of 11 national stations in Changji prefecture from 2012 to 2019,the daily variation characteristics of winter snowfall in Changji prefecture were analyzed by conventional statistical methods.The results show that the spatial distribution of winter snowfall in Changji prefecture was positively correlated with altitude and negatively correlated with latitude,and the snowfall intensity was closely related to latitude.The hourly accumulative snowfall showed a bimodal statewide distribution,with the main peak appearing at 17:00 and the secondary peak at 08:00.In the west,there was a triple-peak,and the main and secondary peaks occurred at 17:00,14:00 and 08:00,respectively.In the eastern part,there was a quasi-single-peak and single-valley type,with the peak occurring at 19:00 and the valley appearing at 13:00.The winter precipitation events in Changji prefecture were mainly short-duration precipitation events,which contributed 64%to the winter precipitation,and the occurrence probability of long-duration precipitation events over 12 h was very small,and only occasionally occurred in some stations.The daily precipitation cycle in winter was closely related to the duration of precipitation in western and eastern Changji and precipitation events lasting 3-4 h contributed the most to the winter precipitation in western and eastern Changji,while their contribution to the precipitation was decreasing with the increase of duration.

关 键 词：冬季降雪 小时降水 日变化 持续性 昌吉 

分 类 号：P426.614[天文地球—大气科学及气象学]