Influence of Swell Wave on Wind Speed Retrieval Using ENVISAT ASAR Wave Mode Imagery

Figure 5

NRCS variation with wind speed and relative wind direction. (a) NRCS curves of upwind direction with swell heights of 0 m, 4 m, and 6 m, respectively. (b) NRCS curves of upwind direction with a swell height of 0 m, a swell height of 2 m, a swell direction of 45°, a swell height of 2 m, and a swell direction of 135°, respectively.

(a)

(b)