Characteristics of Northern Cyclonic Activity in Spring and Its Relationship with Mid- high Latitude Sea Surface Temperature
This paper statistically analyzed the characteristics of northern cyclonic activity in spring and its relationship with raid - high latitude sea surface temperature and general circulation by using the data of daily sea level pressure, monthly pacific sea surface temperature and monthly 500 hPa geopotential height provided by NCEP/NCAR reanalysis. The results showed that the northern cyclonic activity was frequent in spring, and it had two high value centres; in the middle part of Mongolia and in the northeast of our country. There was better correlation between the frequent activity of northern cyclone in spring and the prior mid - high latitude sea surface temperature, especially in Alaska area, the significantly negative correlation between them was always kept from September of last year to February of this year. There was obvious difference in prior sea surface temperature of key areas between abundant cyclonic activity year and poor cyclonic activity year, and the cumulative effect of abnormal sea surface temperature in above two characteristic years on the general circulation expressed in spring, the 500 hPa geopotential height expressed the opposite situation, and it caused the weakness and strengthening of zonal circulation, thus led to the increase and decrease of middle - latitudes cyclonic activity.
SpringNorthern cycloneActivity frequencyMid-high latitude sea surface temperatureGeneral circulation
国家科技期刊平台
NSTL
万方数据
维普
