Sensitivity of satellite microwave and infrared observations to soil moisture at a global scale: 2. Global statistical relationships - Université Pierre et Marie Curie Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research: Atmospheres Année : 2005

Sensitivity of satellite microwave and infrared observations to soil moisture at a global scale: 2. Global statistical relationships

Résumé

In part 1 of this study (Prigent et al., 2004), in situ measurements were used to analyze and describe the sensitivities of satellite measurements (i.e., active and passive microwave observations and surface skin temperature diurnal cycle amplitude) to the soil moisture variations to describe the complex relationships that exist between them. Soil moisture was considered in the first 10-cm layer on a 0.25° equal-area grid and a monthly timescale. In this study, the lessons from the first paper are exploited to document the sensitivity of the satellite data to the global large-scale variations of soil moisture. A statistical model based on neural networks is developed to link the satellite observations and soil moisture estimates. Given the lack of available in situ soil moisture measurements on a global basis, National Centers for Environmental Prediction (NCEP) and European Centre for Medium-Range Weather Forecasts (ECMWF) soil moisture reanalyses are used as a realistic global indicator of soil moisture. As a consequence, the statistical model cannot be considered as a retrieval scheme per se, but it shows the feasibility of such an approach. It also quantifies the information content that can be expected from the satellite observations. Applications of such a statistical model include checking the consistency of surface model, and as the basis for variational assimilation of satellite observations into a numerical surface model.
Fichier principal
Vignette du fichier
Journal of Geophysical Research Atmospheres - 2005 - Aires - Sensitivity of satellite microwave and infrared observations.pdf (735.49 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03733395 , version 1 (20-08-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Filipe Aires, Catherine Prigent, William B. Rossow. Sensitivity of satellite microwave and infrared observations to soil moisture at a global scale: 2. Global statistical relationships. Journal of Geophysical Research: Atmospheres, 2005, 110, pp.11103. ⟨10.1029/2004JD005094⟩. ⟨hal-03733395⟩
38 Consultations
15 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More