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| Titel |
Soil moisture modelling of a SMOS pixel: interest of using the PERSIANN database over the Valencia Anchor Station |
| VerfasserIn |
S. Juglea, Y. Kerr, A. Mialon, E. Lopez-Baeza, D. Braithwaite, K. Hsü |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 8 ; Nr. 14, no. 8 (2010-08-10), S.1509-1525 |
| Datensatznummer |
250012397
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| Publikation (Nr.) |
 copernicus.org/hess-14-1509-2010.pdf |
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| Zusammenfassung |
In the framework of Soil Moisture and Ocean Salinity (SMOS)
Calibration/Validation (Cal/Val) activities, this study addresses the use of
the PERSIANN-CCS1database in hydrological applications to accurately simulate
a whole SMOS pixel by representing the spatial and temporal heterogeneity of the soil moisture fields
over a wide area (50×50 km2). The study focuses on the Valencia Anchor Station (VAS) experimental site,
in Spain, which is one of the main SMOS Cal/Val sites in Europe.
A faithful representation of the soil moisture distribution at SMOS pixel scale (50×50 km2)
requires an accurate estimation of the amount and temporal/spatial distribution of precipitation.
To quantify the gain of using the comprehensive PERSIANN database instead of sparsely distributed rain
gauge measurements, comparisons between in situ observations and satellite rainfall data are done both
at point and areal scale. An overestimation of the satellite rainfall amounts is observed in most of
the cases (about 66%) but the precipitation occurrences are in general retrieved (about 67%).
To simulate the high variability in space and time of surface soil moisture,
a Soil Vegetation Atmosphere Transfer (SVAT) model – ISBA (Interactions
between Soil Biosphere Atmosphere) is used. The interest of using satellite
rainfall estimates as well as the influence that the precipitation events can
induce on the modelling of the water content in the soil is depicted by a
comparison between different soil moisture data. Point-like and spatialized
simulated data using rain gauge observations or PERSIANN – CCS
database as well as ground measurements are used. It is shown that a good adequacy is reached in most
part of the year, the precipitation differences having less impact upon the simulated soil moisture.
The behaviour of simulated surface soil moisture at SMOS scale is verified by the use of remote sensing
data from the Advanced Microwave Scanning Radiometer on Earth observing System (AMSR-E). We show that
the PERSIANN database provides useful information at temporal and spatial scales in the context of soil moisture retrieval.
1Precipitation Estimation from Remotely Sensed Information
using Artificial Neural Networks-Cloud Classification System –
http://chrs.web.uci.edu/persiann |
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