Fig. 5: Changes in u*v* convergence associated with the EMF. | npj Climate and Atmospheric Science

Fig. 5: Changes in u*v* convergence associated with the EMF.

From: A comparison of the meridional meandering of extratropical precipitation during boreal winter: eddy momentum flux versus Eulerian storm tracks

Fig. 5

As in Fig. 1, except that the momentum flux (\({u}^{* }{v}^{* }\)) at 700 hPa is regressed against (a, b) EMFI, c, d NH PC2, and (e, f) NH PC1. The left panels show calculations based on the planetary momentum flux, which is derived from the interaction between the zonal and meridional winds of zonal wave numbers \(k\le 3\). The right panels show calculations based on the synoptic momentum flux, the interaction between the zonal and meridional winds for zonal wave numbers \(k\ge 4\). Changes in storm track activity are overlaid with contours.

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