东北冷涡发生次数和日数气候分析
The Frequency and Days of Northeast Cold Vortex
康恒元1
作者信息
- 1. 哈尔滨市气象综合保障中心,黑龙江 哈尔滨 150028
- 折叠
摘要
基于ERA5 再分析资料筛选的东北冷涡过程数据,分析 1961-2021 年东北冷涡过程发生次数和日数气候和气候变化特征,发现:(1)东北冷涡平均每年发生 31 次,初夏 5 月最多,晚秋 11月最少;冷涡过程持续日数平均 4.2 d,6 月最长,4 月最短;年平均东北冷涡发生日数 126.6 d;东北冷涡持续日数多为 3-4 d.(2)2000 年代和 1970 年代东北冷涡发生较多,1960 年代和 1980 年代较少;1997 年东北冷涡过程最多(39 次),1982 年最少(20 次);东北冷涡过程 5 月显著增多趋势(速率 0.38 次/10 a),7 月减少趋势(速率 0.24 次/10 a).(3)年东北冷涡日数有两次趋势突变,发生在1980 年和 2017 年;5 月冷涡日数有两次趋势突变,发生在 1990 年和 2004 年.各月和年冷涡日数主要表现为年际尺度振荡.
Abstract
Based on ERA5 reanalysis data,the frequency and days of the Northeast cold vortex process from 1961 to 2021 were analyzed,and the climate and climate change characteristics were found to be:(1)The NECV occurs an average of 31 times per year,with the highest occurrence in May and the lowest in November;The av-erage duration of NECV process is 4.2 days,with the longest in June and the shortest in April;The annual aver-age days of NECV is 126.6 days;The duration of NECV is mostly 3-4 days.(2)There were more NECV process-es in the 2000s and 1970s,and fewer in the 1960s and 1980s;In 1997,there were the most NECV processes(39 times),and the least in 1982(20 times);The NECV process showed a significant increase trend in May(rate 0.38 times/10 a),and a decrease trend in July(rate 0.24 times/10 a).(3)There are two climate mutations in the NECV days,occurring in 1980 and 2017;There were two mutations in May,occurring in 1990 and 2004.The days of NECV in each month and year mainly manifests as interannual scale oscillations.
关键词
东北冷涡/发生次数和日数/气候变化Key words
Northeast cold vortex/Number of occurrences and days/Climate change引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据