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| Titel |
Comparing soil moisture retrievals from SMOS and ASCAT over France |
| VerfasserIn |
M. Parrens, E. Zakharova, S. Lafont, J.-C. Calvet, Y. Kerr, W. Wagner, J.-P. Wigneron |
| 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 ; 16, no. 2 ; Nr. 16, no. 2 (2012-02-09), S.423-440 |
| Datensatznummer |
250013173
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| Publikation (Nr.) |
 copernicus.org/hess-16-423-2012.pdf |
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| Zusammenfassung |
| The first products derived over France in 2010 from the L-band brightness
temperatures (Tb) measured by the SMOS (Soil Moisture and Ocean Salinity)
satellite, launched in November 2009, were compared with the surface soil
moisture (SSM) estimates produced by the C-band Advanced Scatterometer,
ASCAT, launched in 2006 on board METOP-A. SMOS and ASCAT SSM products were
compared with the simulations of the ISBA-A-gs model and with in situ
measurements from the SMOSMANIA network, including 21 stations located in
southern France. ASCAT tended to correlate better than SMOS with ISBA-A-gs.
The significant anomaly correlation coefficients between in situ
observations and the SMOS (ASCAT) product ranged from 0.23 to 0.48 (0.35 to
0.96). However, in wet conditions, similar results between the two satellite
products were found. An attempt was made to derive SSM from regressed
empirical logarithmic equations using a combination of SMOS Tb at different
incidence angles and different polarizations, and the Leaf Area Index (LAI)
modeled by ISBA-A-gs. The analysis of the intercept coefficient of the
regression showed an impact of topography. A similar analysis applied to
ASCAT and SMOS SSM values showed a more limited impact of topography on the
intercept coefficient of the SMOS SSM product, while fewer residual
geographic patterns were found for the ASCAT SSM. |
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