Fig. 1From: Latitudinal- and height-dependent long-term climatology of propagating quasi-16-day waves in the troposphere and stratosphereMean frequency-wavenumber spectrum of (a) temperature and (b) zonal wind from February 1979 to January 2018 (39Â years in total) at 37 pressure levels from 1000 to 1Â hPa. W (E) represents westward (eastward) propagationBack to article page