Figure 4
From: Nonlinear internal wave spirals in the northern East China Sea
Horizontal map of apparent free wave speed in the vicinity of the IORS. Apparent free wave speed in m s−1 (c, color bar in the right) incorporating an effective Doppler shift due to the advective flow (speed: U) at the surface (c1) for cases of (a) 16:00, (b) 18:00, (c) 20:00, and (d) 22:00 in September 10, 2014, (e) 10:00 May 28, (f) 22:00 June 3, (g) 22:00 June 5, and (h) 22:00 June 12, 2015. The sill location is denoted by grey triangle in each plot.
