1961-2020年兴安盟大到暴雪的时空分布特征分析

Analysis of the Spatial and Temporal Distribution Characteristics of Xingan League to Blizzard from 1961 to 2020

本文利用1961~2020年兴安盟8个国家站的日降水量、积雪深度等资料,对本地的大到暴雪天气过程进行了统计分析,结果表明:除夏季6~8月份外兴安盟均有大到暴雪出现,并以秋季10月和春季4月最多;近60a大到暴雪天气过程呈现出逐年递增的趋势,以20世纪90年代为界表现为年代际偏少和年代际偏多两个阶段。大到暴雪日数的空间分布呈现出自西北向东南递减的趋势,结合地形来看主要发生在沿大兴安岭的高海拔地区;而大到暴雪降雪量平均值的分布呈现出南北小、中间大的分布特征。

This paper analyzes the daily precipitation and snow depth of eight national stations from 1961 to 2020, and the results show that from June to August, most in October and April;the nearly 60a to blizzard weather process is increasing year by year, in the 1990s.The spatial distribution of large blizzard days decreases from northwest to southeast, mainly in the high altitude areas along the Greater Khinggan Mountains, while the distribution of the mean blizzard snowfall is small and large in the middle.