贵州省区域性凝冻过程的时空特征分析

Temporal and Spatial Characteristics of Regional Freezing Rain Events in Guizhou Province

基于1961~2019年贵州省84站逐日雨凇观测资料,确定了贵州省区域性凝冻过程指标,并根据新标准对区域性凝冻过程的时空特征进行了分析。结果表明:1961~2019年贵州省区域性凝冻过程次数与累积天数均呈减少趋势,在年代际时间尺度上均呈“偏多—偏少—偏多—偏少”的变化特征,在年际时间尺度上均存在7~8a与3~4a的变化周期。贵州省区域性凝冻过程频发区及中心站点高频区主要集中在中部一线,在东北部和南部部分地区发生频率较低。贵州省区域性凝冻过程可分为中东部型、中部型、中西部型、西部型及全省型共5类,其中以中西部型和全省型为主。

Based on the daily observation data of 84 stations in Guizhou province from 1961 to 2019,the indicators of regional freezing rain events in Guizhou Province were determined,and the spatial and temporal characteristics of regional freezing rain events were analyzed according to the new standard.The results are as follows:The frequency and cumulative days showed a decreasing trend,and the interdecadal scale was characterized by“positive-negative-positive-negative”.On the interannual scale,there were significant oscillation periods between 7 and 8 years and between 3 and 4 years.The regional freezing rain events occurred most frequently over the central part of Guizhou province,while the occurrence frequency was low over northeastern and southern parts.The regional freezing rain events could be classified into five types,namely,the central and eastern type,the middle type,the middle-western type,the western type,and the whole area type,among which the middle-western type and whole area type were the main types.