Title :
Root-zone soil moisture analysis using microwave radiometry
Author :
Calvet, Jean-Christophe ; Noilhan, Joël ; Wigneron, Jean-Pierre ; Kerr, Yann
Author_Institution :
Meteo-France/CNRM, Toulouse, France
Abstract :
The SMOS project (CNES/ESA) aims at developing a L-band interferometric radiometer able to provide global estimates of surface soil moisture (ws) with a sampling time of 2-3 d. Several studies showed that the assimilation of ws time series enable one to retrieve the root-zone water content, provided the atmospheric forcing is available from ancillary information. Two real cases of variational assimilation of ws are presented. A simple iterative optimization of the direct model is applied to the ISBA (Interactions between Soil, Biosphere, and Atmosphere) surface scheme. The next step is the direct assimilation of brightness temperatures as likely to be observed from space. A first example of soil moisture and vegetation characteristics analysis using L-band radiometric measurements and the ISBA model is presented. A field campaign was set in Southwestern France in order to validate such an approach using a long enough data-set
Keywords :
hydrological techniques; iterative methods; microwave measurement; moisture measurement; optimisation; radiometry; remote sensing; soil; ISBA; Interactions between Soil, Biosphere, and Atmosphere; L-band interferometric radiometer; L-band radiometric measurements; SMOS project; Southwestern France; assimilation; brightness temperatures vegetation; direct model; iterative optimization; microwave radiometry; root-zone soil moisture analysis; surface soil moisture; time series; Atmosphere; Atmospheric modeling; Biosphere; Content based retrieval; Information retrieval; L-band; Microwave radiometry; Sampling methods; Soil moisture; Surface soil;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 2001. IGARSS '01. IEEE 2001 International
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-7031-7
DOI :
10.1109/IGARSS.2001.976048