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Impact on sea surface salinity retrieval of different auxiliary data within the SMOS mission ArchiMer
Sabia, Roberto; Camps, A; Vall Ilossera, M; Reul, Nicolas.
Aiming to provide sea surface salinity (SSS) maps with a spatiotemporal averaged accuracy of 0.1 psu (practical salinity units), the Soil Moisture and Ocean Salinity (SMOS) community is increasingly focusing on the determination of a robust inversion scheme to enable SSS retrieval from L-band brightness temperature data. In the framework of the Synergetic Aspects and Auxiliary Data Concepts for Sea Surface Salinity Measurements from Space project, efforts have been oriented toward a quantitative analysis of SSS retrieval using different auxiliary data sets. This paper aims to contribute to the assessment of the SMOS salinity retrieval error budget in view of the upcoming SMOS mission ground segment development. Aiming to do that, different models and...
Tipo: Text Palavras-chave: Spatiotemporal averaging; Sea salinity; Microwave radiometry; Auxiliary data.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2011.pdf
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The emissivity of foam-covered water surface at L-band: Theoretical modeling and experimental results from the frog 2003 field experiment ArchiMer
Camps, A; Vall-ilossera, M; Villarino, R; Reul, Nicolas; Chapron, Bertrand; Corbella, I; Duffo, N; Torres, F; Miranda, Jj; Sabia, R; Monerris, A; Rodriguez, R.
Sea surface salinity can be measured by microwave radiometry at L-band (1400-1427 MHz). This frequency is a compromise between sensitivity to the salinity, small atmospheric perturbation, and reasonable pixel resolution. The description of the ocean emission depends on two main factors: 1) the sea water permittivity, which is a function of salinity, temperature, and frequency, and 2) the sea surface state, which depends on the wind-induced wave spectrum, swell, and rain-induced roughness spectrum, and by the foam coverage and its emissivity. This study presents a simplified two-layer emission model for foam-covered water and the results of a controlled experiment to measure the foam emissivity as a function of salinity, foam thickness, incidence angle, and...
Tipo: Text Palavras-chave: Brightness temperature; Emission; Foam; Microwave radiometry; Salinity; Sea.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00000/10940/9268.pdf
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