Objective identification research on cold vortex and mid-summer rainy periods in Northeast China*
Gong Zhi-Qianga)†, Feng Tai-Chenb), Fang Yi-Hec)
       
Differences in 850-hPa vector wind field between P2 and P 1 (a), between P3 and P2 (b), and between P4 and P3 (c), (shaded areas represent the regions with the difference obtained through the significance test, in units of m/s)