1961-2021年黑龙江省春播期东北冷涡气候影响特征
Characteristics of climate impact of Northeast China Cold Vortex during spring sowing period in Heilongjiang province from 1961 to 2021
马舒扬 1李永生 1班晋 1赵佳莹 1王营1
作者信息
- 1. 黑龙江省气候中心,黑龙江哈尔滨 150030
- 折叠
摘要
选用1961-2021 年黑龙江省62 站逐日地面降水、气温资料及NCEP/NCAR再分析资料,统计分析黑龙江省春播期间持续时间3d及以上的东北冷涡活动特征及其对春播期气候要素的影响.结果表明:61 a春播期发生东北冷涡过程233 次,共958 d,发生频次及日数均为增大趋势,发生频次与单次冷涡持续时间为显著负相关.东北冷涡的降水贡献率约为43.29%,冷涡过程中出现大雨及暴雨日的频率较大,分别为48.66%和59.46%;东北冷涡对春播期气温影响不显著.500 hPa位势高度场,东北冷涡与贝加尔湖至鄂霍茨克海阻塞高压存在较好的正相关,超 30%的冷涡活动与鄂霍茨克海阻塞高压相伴发生.鄂霍茨克海阻塞高压对冷涡降水有显著的增强作用,而对冷涡过程低温的影响不显著.
Abstract
Using daily surface precipitation and temperature data from 62 stations in Heilongjiang province from 1961 to 2021 and the National Centers for Environmental Prediction/the National Center for Atmospheric Research(NCEP/NCAR)reanalysis data,we statistically analyzed the characteristics of Northeast China Cold Vortex(NC-CV)that lasted 3 days or more during the spring sowing period and its impact on climatic factors.The results show that a total of 233 NCCV events occurred on a total of 958 days during the spring sowing periods of 61 years.The occurrence frequency and day numbers of NCCV exhibited an increasing trend,and the occurrence frequency of NCCV had a significantly negative correlation with the duration of a single cold vortex.The precipitation contribu-tion of NCCV was about 43.29%,and the frequency of heavy precipitation days and rainstorm days during NCCV processes was relatively high,being 48.66%and 59.46%,respectively.The NCCV had no significant impact on air temperature during the spring sowing period.At 500 hPa geopotential height field,there was a good positive correlation between the NCCV and the blocking high area from Lake Baikal to Okhotsk Sea.More than 30%of the NCCV activities were accompanied by the Okhotsk blocking high.The Okhotsk blocking high enhanced the cold vortex precipitation,but had no significant effect on the low temperature during the NCCV process.
关键词
东北冷涡/阻塞高压/春播期/环流特征Key words
Northeast China Cold Vortex(NCCV)/Blocking high pressure/Spring sowing period/Circulation char-acteristics引用本文复制引用
基金项目
中国气象局气象能力提升联合研究专项(22NLTSY001)
黑龙江省自然科学基金(LH2022D022)
中国气象局沈阳大气环境研究所联合开放基金(2021SYIAEKFMS10)
出版年
2024
国家科技期刊平台
NSTL
万方数据