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Earth, Planets and Space
Fig. 8 | Earth, Planets and Space

Fig. 8

From: Extraordinary quasi-16-day wave activity from October 2013 to January 2014 with radar observations at mid-latitudes and MERRA2 reanalysis data

Fig. 8

Period–wavenumber spectrum of zonal wind at 0.6 hPa level from MERRA2 reanalysis data in two time intervals of a 22 November–23 December 2013 and b 20 January–20 February 2014. The negative wavenumber represents the westward propagation of wave. The dotted horizontal line denotes the period of 16 days, and the two dotted vertical lines denote the wavenumbers of − 1 and − 2, respectively

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