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Sea state effect on the sea surface emissivity at L-band
Miranda, J.; Vall-Llossera Ferran, Mercedes Magdalena; Camps Carmona, Adriano José; Duffo Ubeda, Núria; Corbella Sanahuja, Ignasi; Etcheto, Jacqueline
Universitat Politècnica de Catalunya. Departament de Teoria del Senyal i Comunicacions; Universitat Politècnica de Catalunya. RSLAB - Grup de Recerca en Teledetecció
In May 1999, the European Space Agency (ESA) selected the Earth Explorer Opportunity Soil Moisture and Ocean Salinity (SMOS) mission to obtain global and frequent soil moisture and ocean salinity maps. SMOS' single payload is the Microwave Imaging Radiometer by Aperture Synthesis (MIRAS), an L-band two-dimensional aperture synthesis radiometer with multiangular observation capabilities. At L-band, the brightness temperature sensitivity to the sea surface salinity (SSS) is low, approximately 0.5 K/psu at 20/spl deg/C, decreasing to 0.25 K/psu at 0/spl deg/C, comparable to that to the wind speed /spl sim/0.2 K/(m/s) at nadir. However, at a given time, the sea state does not depend only on local winds, but on the local wind history and the presence of waves traveling from far distances. The Wind and Salinity Experiment (WISE) 2000 and 2001 campaigns were sponsored by ESA to determine the impact of oceanographic and atmospheric variables on the L-band brightness temperature at vertical and horizontal polarizations. This paper presents the results of the analysis of three nonstationary sea state conditions: growing and decreasing sea, and the presence of swell. Measured sea surface spectra are compared with the theoretical ones, computed using the instantaneous wind speed. Differences can be minimized using an "effective wind speed" that makes the theoretical spectrum best match the measured one. The impact on the predicted brightness temperatures is then assessed using the small slope approximation/small perturbation method (SSA/SPM).
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Teledetecció
Surface waves
Ocean-atmosphere interaction
Boundary layer (Meteorology)
Winds
Oceanography
ocean waves
remote sensing
wind
L-Band
MIRAS
Microwave Imaging Radiometer by Aperture Synthesis
SMOS
SSA/SPM
Soil Moisture and Ocean Salinity mission
WISE
Wind and Salinity Experiment
brightness temperature
horizontal polarizations
multiangular observation capabilities
sea state effect
sea surface emissivity
sea surface spectra
small slope approximation/small perturbation method
two-dimensional aperture synthesis radiometer
vertical polarizations
winds
Capa límit (Meteorologia)
Oceanografia
Interacció oceà-atmosfera
Vent
Ones de superfície
Artículo
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
         

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