Fig. 7

Frequency–wavenumber spectra of geopotential height (top), zonal wind (middle) and meridional wind (bottom) at 1 hPa and 80 °N in January 2013
Frequency–wavenumber spectra of geopotential height (top), zonal wind (middle) and meridional wind (bottom) at 1 hPa and 80 °N in January 2013