影响北印度洋热带气旋生成环境因子的月际变化特征

柳龙生, 张新忠, 许映龙

Monthly variation characteristics of environmental factors affecting tropical cyclone genesis over the North Indian Ocean

LIU Longsheng, ZHANG Xingzhong, XU Yinglong

图5 1979—2018年北印度洋月平均200 hPa与850 hPa垂直风速切变（彩色填色区,单位：m·s-1）和200 hPa风场（箭头,单位：m·s-1）

Fig.5 The monthly mean vertical wind velocity shear between 200 hPa and 850 hPa （color shaded areas, Unit： m·s-1）and wind field at 200 hPa （arrows, Unit： m·s-1） over the North Indian Ocean from 1979 to 2018