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Fig. 6 | Earth, Planets and Space

Fig. 6

From: 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-Interim

Fig. 6

Maps of potential vorticity (in PVU where 1 PVU = \({10}^{-6}K{kg}^{-1}{m}^{2}{s}^{-1}\)) at 850 K (top) and 530 K (bottom) potential temperature surface on 28 December 2012, 2 January 2013, 7 January 2013 and 12 January 2013 (from left to right) in the NH. The overlaid contour represents the geopotential heights at 10 hPa (top) and 50 hPa (bottom), where the black and white solid thick lines denote different values (km). The domain is from the equator to the pole with dashed circles at 30 \(^\circ \mathrm{N}\) and 60 \(^\circ \mathrm{N}\); 0 \(^\circ \) longitude is at the bottom and 90 \(^\circ \mathrm{E}\) is to the right

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