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2 1979—2018年北印度洋热带气旋月平均GPI(彩色填色区)和路径(红色实线)
Fig.2 The monthly mean GPI (color shaded areas) and tracks (red solid lines)of tropical cyclones over the North Indian Ocean from 1979 to 2018