Figure 1
From: Nonlinear internal wave spirals in the northern East China Sea
Synthetic aperture radar (SAR) images in the vicinity of a small topographic sill (submerged rock known as IEODO, 32°N 7.38′, 125°E 10.95′) in the northern East China Sea. SAR images taken on (a) 21:45:30 UTC September 10, 2014, (b) 09:43:54 UTC May 28, 2015, (c) 21:38:07 UTC June 3, 2015, (d) 21:31:17 UTC June 5, 2015, (e) 21:45:31 UTC June 12, 2015, and (f) bottom topography around the sill (color scale in the top-left), superimposed with a surface manifestation of wave fronts where the increased sea surface roughness is found in association with convergences of near-surface currents induced by internal waves (from ‘A’ to ‘H’ in 2014; pink, from ‘I’ to ‘M’ in 2015; orange) with an indication of directional measure of distance (distance from a moving local origin as a function of an angle difference θ in degree rotated counterclockwise from the east).
