贵州省近70年区域凝冻事件特征分析

The Characteristic Analysis of Regional Freezing Events in Recent 70 Years in Guizhou Province

摘要: 通过对1951~2021年贵州省84个站点观测资料整理分析，结合国内外对于凝冻灾害性天气的等级划分，总结贵州省凝冻灾害性天气事件定义，建立贵州近70年发生的区域性凝冻事件个例库。对个例库中凝冻事件时空特征进行分析，发现每年12月至次年3月为凝冻事件发生期，其中以1月11日至2月11日为凝冻事件高发期，近70年中，该时间段内有33%的几率出现凝冻事件。在凝冻事件库中，大方成为事件中心的频次占比为32%，威宁占比为26%，说明虽然威宁单站凝冻事件为全省之最，但在大范围事件中，大方受灾更严重。

Abstract: By sorting out and analyzing the observation data of 84 stations in Guizhou province from 1951 to 2021 and combining it with the classification of severe freezing weather at home and abroad, the definition of severe freezing weather events in Guizhou province was summarized. A case database of regional freezing events that occurred in Guizhou in recent 70 years was established. By analyzing the spatiotemporal distribution characteristics of freezing events in the case database, it was found that the occurrence period of freezing events was from December to March of the next year, among which January 11 to February 11 was the high occurrence period of freezing events. In 70 years, there was a 33% chance of occurrence of freezing events in this period. In the freezing event database, the frequency of Dafang becoming the event center accounted for 32% and Weining accounted for 26%, indicating that Dafang suffered more serious disasters in large-scale events.