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Mapping Surface Soil Moisture Over the Gourma Mesoscale Site (Mali) by Using Envisat Asar Data : Volume 15, Issue 2 (18/02/2011)

By Baup, F.

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Book Id: WPLBN0003992709
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Mapping Surface Soil Moisture Over the Gourma Mesoscale Site (Mali) by Using Envisat Asar Data : Volume 15, Issue 2 (18/02/2011)  
Author: Baup, F.
Volume: Vol. 15, Issue 2
Language: English
Subject: Science, Hydrology, Earth
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Frappart, F., Hiernaux, P., Rosnay, P. D., Mougin, E., Frison, P. L., Zribi, M.,...Viarre, J. (2011). Mapping Surface Soil Moisture Over the Gourma Mesoscale Site (Mali) by Using Envisat Asar Data : Volume 15, Issue 2 (18/02/2011). Retrieved from http://hawaiilibrary.net/


Description
Description: CESBIO (Centre d'Etudes Spatiales de la Biosphère, UMR 5126, UPS-CNRS-CNES-IRD), 18 avenue Edouard Belin, 31401 Toulouse cedex 9, France. The potentialities of ENVISAT ASAR (Advanced Synthetic Aperture Radar) multi-angle data for mapping surface soil moisture (SSM) in Sahelian rangelands are investigated at medium scale (30 000 km2). The Wide Swath data are selected to take advantage of their high temporal repetitivity (about 8 days at the considered scale) associated to a moderate spatial resolution (150 m). In the continuity of previous studies conducted at a local scale in the same region, SSM maps are here processed over the whole AMMA Gourma mesoscale site at 1 km resolution scale. Overall, the generated maps are found to be in good agreement with field data, EPSAT-SG (Estimation des Pluies par SATellite – Second Generation) rainfall estimates and ERS (European Remote Sensing) Wind Scatterometer (WSC) SSM products. The present study shows that the spatial pattern of SSM can be realistically estimated at a kilometric scale. The resulting SSM maps are expected to provide valuable information for initialisation of land surface models and the estimation of the spatial distribution of radiative fluxes. Particularly, SSM maps could help to desaggregate low-resolution products such as those derived from WSC data.

Summary
Mapping surface soil moisture over the Gourma mesoscale site (Mali) by using ENVISAT ASAR data

Excerpt
Baup, F., Mougin, E., D. Rosnay, P., Timouk, F., Lavenu, F., and Chênerie, I.: Surface soil moisture estimation over the AMMA sahelian site in Mali using ENVISAT/ASAR data, Remote Sens. Environ., 109, 473–481, 2007a.; Baup, F., Mougin, E., Hiernaux, P., Lopes, A., De Rosnay, P., and Chênerie, I.: Radar signatures of Sahelian surfaces in Mali using ENVISAT-ASAR data, IEEE T. Geosci. Remote., 45, 2354–2363, 2007b.; Berger, M., Camps, A., Font, J., Kerr, Y., Miller, J., Johannessen, J., Boutin, J., Drinkwater, M. R., Skou, N., Floury, N., Rast, M., Rebhan, H., and Attema, E.: Measuring Ocean Salinity with ESA's SMOS Mission, ESA Bulletin 111, 113f, 2002.; Bergès, J. C. and Chopin, F.: Satellite rainfall estimation using a feed forward network: improvement and limitation, Proc. of the International Conference on Cloud Climatology and Precipitation, Bologna, 2004.; Bergès, J. C., Chopin, F., and Bessat, F.: Satellite based downscaling for rainfall estimation, Proc. of the IV Coloquio Brasiliero de Ciencas Geodesicas, Curitiba, 2005.; Cappelaere, B., Descroix L., Lebel T., Boulain N., Ramier D., Laurent J.-P., Le Breton E., Boubkraoui S., Boucher M., Bouzou Moussa I., Chaffard V., Hiernaux P., Issoufou H. B. A., Le Breton, E., Mamadou I., Nazoumou Y., Oi, M., Ottlé, C., andv Quantin, G.: The AMMA-Catch experiment in the cultivated Sahelian area of south-west Niger – Investigating water cycle response to a fluctuating climate and changing environment, J. Hydrol., 375, 34–51, 2009.; Casenave, A. and Valentin, C.: Les états de surface de la zone sahélienne. Influence sur l'infiltration. ORSTOM, collection Didactiques, Paris, 229 p., 1989.; Chanzy, A., Schmugge, T. J., Calvet, J.-C., Kerr, Y., Oevelen, P. V., Grosjean, O., and Wang, J. R.: Airbone microwave radiometry on a semi arid area during HAPEX-Sahel, J. Hydrol., 188–189, 285–309, 1997.; Chopin, F., Bergès, J. C., and Desbois M.: Using MSG for GPCP products enhancement, Proc. of the 1st International AMMA conference, oral presentation, Dakar, (available at http://amma-international.org/), 2005.; Clark, D. B., Taylor, C. M., Thorpe, and A. J.: Feedback between the land surface and rainfall at convective length scales, J. Hydrometeorol., 5, 625–639, 2004.; de Rosnay, P., Gruhier, C., Timouk, F., Baup, F., Mougin, E., Hiernaux, P., Kergoat, L., and LeDantec, V.: Multi-scale soil moisture measurements at the Gourma meso-scale site in Mali, J. Hydrol., 375, 241–252, 2009.; Desnos, Y. L., Laur, H., Lim, P., Meisl, P., and Gach, T.: The ENVISAT-1 Advanced Synthetic aperture radar processor and data products, Geoscience and Remote Sensing Symposium, IGARSS'99, Hamburg, Germany, 1683–1685, 1999.; ENVI Programmer's Guide: Research System, Inc., 930 pp., 1998.; ENVISAT ASAR product Handbook: European Space Agency, Issue 2.2. 564 pages, available at: http://envisat.esa.int/handbooks/, 2007.; Frappart, F., Hiernaux, P., Guichard, F., Mougin, E., Kergoat, L., Arjounin, M., Lavenu, F., Koité, M., Paturel, J. E., and Lebel, T.: Rainfall regime across the Sahel band in the Gurma region, Mali, J. Hydrol., 375(1–2), 128–142, doi:10.1016/j.jhydrol.2009.03.007, 2009.; Frison, P. L. and Mougin, E.: Use of the ERS-1 Wind scatterometer data over land surfaces. IEEE T. Geosci. Remote. 34(2), 550–560, 1996.; Frison, P. L., Mougin, E., and Hiernaux, P.: Observations and interpretation of Seasonal ERS-1 Wind Scatteromter Data over Northern Sahel (Mali), Remote Sens. Environ., 63, 233–242, 1998.; GEWEX-news: Global Energy and Water Cycle Experiment, special issue AMMA west African monsoon studies are addressing water cycle issues, 16(1), 20 pp., 2006.; Gruhier, C., de Rosnay, P., Hasenauer, S., Holmes, T., de Jeu, R., Kerr, Y., Mougin, E., Njoku, E., Timouk, F., Wagner, W., and Zribi, M.: Soil moisture activ

 

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