Fig. 3From: Extraordinary quasi-16-day wave activity from October 2013 to January 2014 with radar observations at mid-latitudes and MERRA2 reanalysis dataa Zonal mean temperature averaged from 60°N to 90°N at 10 hPa and b zonal mean zonal wind at 10 hPa over 60°N derived from MERRA2 reanalysis data. The black solid and dashed vertical lines denote the major and minor SSW events, respectively, and the black dotted vertical lines denote the SFW eventsBack to article page