Figure 3
From: Nonlinear internal wave spirals in the northern East China Sea
Time series of the advective flow speeds (U), apparent free wave speeds (c), and corresponding Froude numbers (F and G). Time series of the advective flow speeds (blue), apparent free wave speeds (green), and corresponding Froude numbers (red) and composite Froude numbers (black) (a) from 10:00 UTC September 8 to 22:00 UTC September 10, 2014, (b) from 10:00:00 UTC May 27 to 10:00:00 UTC May 28, 2015, (c) from 22:00:00 UTC June 2 to 22:00:00 UTC June 3, 2015, (d) from 22:00:00 UTC June 4 to 22:00:00 UTC June 5, 2015, and (e) from 22:00:00 UTC June 11 to 22:00:00 UTC June 12, 2015. Vertical arrow with labels corresponding to the NIW fronts shown in Fig. 1f indicates when the free wave propagation was favorably initiated or NIW front is presumably formed to fit the SAR observations, which generally correspond to periods of small Froude number (G; thick solid black). Significant decreases in the Froude number to yield subcritical conditions are remarked with pink and orange shades.
