Evaluation of remotely sensed and modelled soil moisture products using global ground-based in situ observations
作者： Clement Albergel , Patricia de Rosnay , Claire Gruhier , Joaquin Muñoz-Sabater , Stefan Hasenauer
DOI: 10.1016/J.RSE.2011.11.017
关键词:
摘要: In situ soil moisture data from more than 200 stations located in Africa, Australia, Europe and the United States are used to determine reliability of three products, one analysis ECMWF (European Centre for Medium-Range Weather Forecasts) numerical weather prediction system (SM-DAS-2) two remotely sensed namely ASCAT (Advanced scatterometer) SMOS (Soil Moisture Ocean Salinity). SM-DAS-2 is produced offline at relies on an advanced surface assimilation (Extended Kalman Filter) optimally combine conventional observations with satellite measurements. provided near real time by EUMETSAT. At ECMWF, analyses SM-DAS-2, also. Finally level product developed CESBIO used. Evaluation times series as well anomaly values, shows good performances products capture annual cycle short term variability. Correlations very satisfactory over most investigated sites contrasted biomes climate conditions averaged values 0.70 0.53 0.54 SMOS. Although radio frequency interference disturbs natural microwave emission Earth observed several parts world, hence retrieval, Australia encouraging.
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