Fig. 7From: Global characteristics of the westward-propagating quasi-16-day wave with zonal wavenumber 1 and the connection with the 2012/2013 SSW revealed by ERA-InterimFrequency–wavenumber spectra of geopotential height (top), zonal wind (middle) and meridional wind (bottom) at 1 hPa and 80 °N in January 2013Back to article page