Removing the impact of wind direction on remote sensing of sea surface salinity

Using the small-slope approximation model of microwave emission of rough sea surface, the impacts of sea surface wind on brightness tem- perature variations generated by the surface rough- ness, i.e. ?Th,v, are investigated. Here ?T denotes the brightness temperature variation, and “h” and “v” denote the horizontal and vertical polarizations re- spectively. ?Th,v has a linear relation with wind speed, sea surface temperature (SST) and sea surface sa- linity (SSS) respectively. Further more, the impact of wind direction on SSS retrieval, under small inci- dence angles, can be removed by calculating (?Th+?Tv). These characteristics provide simple new ways to develop an SSS retrieval algorithm without wind direction factor.

Using the small-slope approximation model of microwave emission of rough sea surface, the impacts of sea surface wind on brightness temperature variations generated by the surface roughness, i.e. ATh, △Th,v, are investigated. Here △T denotes the brightness temperature variation, and ＂h＂ and ＂v＂ denote the horizontal and vertical polarizations respectively. △Th, v has a linear relation with wind speed, sea surface temperature （SST） and sea surface sa- linity （SSS） respectively. Further more, the impact of wind direction on SSS retrieval, under small incidence angles, can be removed by calculating （△Th＋△Tv）. These characteristics provide simple new ways to develop an SSS retrieval algorithm without wind direction factor.