Adaptation of the SMOS soil moisture retrieval algorithm for organic-rich soils and its validation over various northern sites

Bircher, Simone;Richaume, Philippe;Mahmoodi, Ali;Demontoux, François;Kerr, Yann;et.al.
(2016) 14th Specialist Meeting on Microwave Radiometry And Remote Sensing for the Environment (MicroRad) — Location: Espoo, Finland (11.April.2016)

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Authors
  • Bircher, SimoneCentre d'Etudes Spatiales de la Biosphère, Toulouse, France
    Author
  • Richaume, PhilippeCentre d'Etudes Spatiales de la Biosphère, Toulouse, France
    Author
  • Mahmoodi, AliCentre d'Etudes Spatiales de la Biosphère, Toulouse, France
    Author
  • Demontoux, FrançoisUniversity of Bordeaux, France
    Author
  • Jonard, FrançoisUCLouvain
    Author
  • Kerr, YannCentre d'Etudes Spatiales de la Biosphère, Toulouse, France
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Abstract
From the passive L-band microwave radiometer onboard the Soil Moisture and Ocean Salinity (SMOS) space mission global surface soil moisture data is retrieved every 3 days. Thus far, the empirical L-band Microwave Emission of the Biosphere (L-MEB) radiative transfer model applied in the SMOS soil moisture retrieval algorithm is exclusively calibrated over test sites in dry and temperate climate zones and the included dielectric mixing model relating soil moisture to permittivity accounts only for mineral soils. However, soil moisture monitoring over the higher northern latitudes is crucial since these régions are especially sensitive to climate change and a considerable feedback is expected due to carbon liberated from thawing ground of these extremely organic soils. Due to differing structural characteristics and thus varying bound water fractions, the permittivity of organic material is lower than the one of most mineral soils at a given water content. This assumption was verified by means of measurements in organic and mineral substrates from various sites in Denmark, Finland, Scotland and Siberia.
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Bircher, S., Richaume, P., Mahmoodi, A., Demontoux, F., Ikonen, J., Rautiainen, K., Vehviläinen, J., Moreaux, V., Kim, Y., Lee, B.-Y., Suzuki, R., Ikawa, H., Oechel, W., Belelli Marchesini, L., Dolman, H., Berg, A., Jonard, F., Weihermüller, L., Andreasen, M., et al. (2016). Adaptation of the SMOS soil moisture retrieval algorithm for organic-rich soils and its validation over various northern sites. 14th Specialist Meeting on Microwave Radiometry And Remote Sensing for the Environment (MicroRad), Espoo, Finland. https://hdl.handle.net/2078.5/43095