Characteristics of climate impact of Northeast China Cold Vortex during spring sowing period in Heilongjiang province from 1961 to 2021
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.
Northeast China Cold Vortex(NCCV)Blocking high pressureSpring sowing periodCirculation char-acteristics
国家科技期刊平台
NSTL
万方数据
