Dynamic Seasonal Transition from Winter to Summer in the Northern Hemisphere Stratosphere
ZHANG Yu-Li1,2, LIU Yi2, LIU Chuan-Xi2
Figure 2 The climatological mean 1979-2011 a start dates, b end dates, and c duration of the stratospheric winter-to-summer seasonal transition ST period in the Northern Hemisphere defined by ERA-Interim zonal wind velocity U units: a, b day of year; c day.