Roughness parameterization for soil moisture optimum retrieval over the Valencia anchor station
FERNANDEZ-MORAN, Roberto
Department of Earth Physics and Thermodynamics [Valencia]
Interactions Sol Plante Atmosphère [UMR ISPA]
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Department of Earth Physics and Thermodynamics [Valencia]
Interactions Sol Plante Atmosphère [UMR ISPA]
FERNANDEZ-MORAN, Roberto
Department of Earth Physics and Thermodynamics [Valencia]
Interactions Sol Plante Atmosphère [UMR ISPA]
Department of Earth Physics and Thermodynamics [Valencia]
Interactions Sol Plante Atmosphère [UMR ISPA]
PARRENS, Marie
Interactions Sol Plante Atmosphère [UMR ISPA]
Centre d'études spatiales de la biosphère [CESBIO]
Interactions Sol Plante Atmosphère [UMR ISPA]
Centre d'études spatiales de la biosphère [CESBIO]
WANG, Shu
Interactions Sol Plante Atmosphère [UMR ISPA]
University of Chinese Academy of Sciences [Beijing] [UCAS]
< Reduce
Interactions Sol Plante Atmosphère [UMR ISPA]
University of Chinese Academy of Sciences [Beijing] [UCAS]
Language
en
Autre communication scientifique (congrès sans actes - poster - séminaire...)
This item was published in
4th International Symposium on Recent Advances in Quantitative Remote Sensing: RAQRS'IV, 2014-09-22, Torrent (Valencia). 2014
English Abstract
The Valencia Anchor Station (VAS) is a validation site of SMOS (Soil Moisture and Ocean Salinity) since 2010. For this purpose, different in situ measurements are performed there. This paper will focus on the parameterization ...Read more >
The Valencia Anchor Station (VAS) is a validation site of SMOS (Soil Moisture and Ocean Salinity) since 2010. For this purpose, different in situ measurements are performed there. This paper will focus on the parameterization of roughness, a key topic for the SMOS and SMAP (Soil Moisture Active Passive) missions. The area covered by the VAS is quite homogeneous, a surface of 50 x 50 km2 mainly composed by vineyards (65%) and other Mediterranean vegetation (30%), which is very stable along the year. The vegetative period of the vineyards lasts approximately from April to October. MELBEX-III is a station inside the area of the VAS, where among other equipments (meteorological station, thermistors, etc.), there is an ELBARA-II Lband radiometer performing multi-angular measurements over a vineyard. There are also two Delta-T ML2x soil moisture probes, one measuring between two rows of vines and the other one next to a vine stump. In the year 2013, measurements of roughness were done regularly by means of a needle board before and after all the agricultural practices, and before and after rainfall events which took place in MELBEX-III. These measurements provide the standard deviation of heights (SD) and correlation length (LC), which can be used to compute the input roughness parameters for the model L-MEB (L-band Microwave Emission of the Biosphere). L-MEB is the base of the SMOS algorithm for soil moisture (SM) retrieval. Using the ELBARA-II multi-angular brightness temperatures and testing many different parameterizations of roughness, SM has been retrieved at 6 am and 6 pm every day in 2013 and then compared to the in situ data (Theta Probe measurements). Based on this analysis, we evaluated and discussed which roughness parameterization provides the best retrieval of SM in terms of several statistical criteria: RMSE, BIAS and correlation coefficient.Read less <
Keywords
télédétection
SMOS
site instrumenté
radiomètre
Origin
Hal imported