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SMOS Brightness Temperature Enhancement in Coastal Areas

AuthorsGonzález, Verónica ; Olmedo, Estrella ; Martínez, Justino ; Gabarró, Carolina ; Portabella, Marcos ; Turiel, Antonio ; Font, Jordi
Issue Date15-Apr-2013
CitationSMOS & Aquarius Science Workshop. Abstract book: 32 (2013)
AbstractSMOS observations near coastal areas and inland water bodies are not of practical use in the retrieval of the geophysical parameters. This is due to the instrument's limited spatial resolution and the Gibbs phenomenon, which appears near abrupt transitions such as coastlines. Hence, the enhancement of the SMOS brightness temperature products in these zones is important, since it will significantly improve the quality of both soil moisture and sea surface salinity retrievals. This paper is focused on the development of an algorithm to enhance the quality of SMOS brightness temperature products near coastal areas. The original SMOS brightness temperature (TB) image is first decomposed in two images using a land/sea mask with higher spatial resolution (e.g. 5 min for the ETOPO5 grid) than SMOS (~40 km). One of these images containing the land pixels of the initial image and the other containing the sea pixels. Both images are then screened out to discard TB data close to the coastline (~200 km), since these pixels are highly affected by the Gibbs phenomenon. A dedicated exemplar-based region filling algorithm is applied to these two images. Then, the final brightness temperature image is obtained by combining the obtained land and sea TB images. This image has a high resolution coastline and does not present most of the land-sea contamination effects. At present, we are working on refining these techniques to better detect small TB gradients (i.e. deltas) close to the coast. In order to assess the quality of the enhanced brightness temperatures obtained with the proposed technique, we compare them to forward models. After that, the sea surface salinity and soil moisture retrievals obtained using the improved TBs will be compared to in-situ measurements. First results of this added-value brightness temperature product will be presented at the workshop
DescriptionGonzález, Verónica ... et al.-- SMOS & Aquarius Science Workshop, 15-17 April 2013, Brest, France
Publisher version (URL)http://www.congrexprojects.com/docs/default-source/13c07_docs3/smos-aquarius-abstract-book.pdf?sfvrsn=2
Appears in Collections:(ICM) Comunicaciones congresos
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