Title :
Microwave Emissivity Over Ocean in All-Weather Conditions: Validation Using WINDSAT and Airborne GPS Dropsondes
Author :
Boukabara, Sid-Ahmed ; Weng, Fuzhong
Author_Institution :
Center for Satellite Applic. & Res., Nat. Oceanic & Atmos. Adm., Camp Springs, MD
Abstract :
Emissivity spectra computed by the FASTEM-3 model using global positioning system dropsonde wind as input are compared to emissivity retrieved from stringently coincident WINDSAT measurements, using a variational approach. This is done in both clear and rainy conditions to assess the validity of both the emissivity model and the retrieval technique in all conditions. Results of this comparison are presented for vertical and horizontal polarizations, in moderate to high wind conditions. In particular, a slope difference is found, and its potential sources are discussed in this paper.
Keywords :
Global Positioning System; atmospheric techniques; remote sensing; wind; FASTEM-3 model; airborne GPS dropsondes; all-weather condition; clear condition; emissivity spectra; global positioning system dropsonde WINDSAT measurement; horizontal polarization; microwave emissivity; ocean; rainy condition; variational approach; vertical polarization; Dielectric constant; Global Positioning System; Hurricanes; Ocean temperature; Optical surface waves; Rough surfaces; Sea surface; Solid modeling; Surface roughness; Surface treatment; Dropsonde (DS); hurricane; microwave emissivity; retrieval algorithm; variational assimilation;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2007.905366
