ERA5 jet axes 1979-2022

Jet axes on the PV2 surface detected in the ERA5 reanalysis. Jet axes separate cyclonic from anticyclonic wind shear and trace lines of maximum winds.基于ERA5再分析资料（ERA5 reanalysis）识别得到的PV2位涡等熵面（PV2 surface）上的急流轴。急流轴可区分气旋性风切变与反气旋性风切变，同时为最大风速的轨迹线。