| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kerr, Yann H.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2020In-situ multifrequency dielectric measurements to improve soil permittivity models for radiometric observations of soil in the high latitudescitations
- 2019Antipodal Vivaldi antennas dedicated to in-situ broadband microwave permittivity measurements
- 2019Antipodal Vivaldi antennas dedicated to in-situ broadband microwave permittivity measurements
- 2019Antipodal Vivaldi antennas dedicated to in-situ broadband microwave permittivity measurements
- 2019Antipodal Vivaldi antennas dedicated to in-situ broadband microwave permittivity measurements
- 2017Efficiency of end effect probes for in-situ permittivity measurements in the 0.5–6 GHz frequency range and their application for organic soil horizons studycitations
- 2017Wireless network of stand-alone end effect probes for soil in situ permittivity measurements over the 100MHZ-6GHz frequency range
- 2017Towards an improved soil moisture retrieval for organic-rich soils from SMOS passive microwave L-band observations
- 2013Temperature- and Texture-Dependent Dielectric Model for Moist Soils at 1.4 GHz
- 2012Temperature and texture dependent dielectric model of moist soils at the SMOS frequency
- 2011Evaluation of a Numerical Modeling Approach based on the Finite Element Method for calculating the Rough Surface Scattering and Emission of a soil layercitations
- 2010COUPLING THE TEMPERATURE AND MINERALOGY DEPENDABLE SOIL DIELECTRIC MODEL AND A NUMERICAL MODEL TO COMPUTE SCATTERING COEFFICIENT OF COMPLEX MULTILAYER SOIL STRUCTURES
- 2009Modeling the effect of surface roughness on the back-scattering coefficient and emissivity of a soil-litter medium using a numerical model
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document
Towards an improved soil moisture retrieval for organic-rich soils from SMOS passive microwave L-band observations
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 2 - 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. Furthermore, the included dielectric mixing model relating soil moisture to relative permittivity accounts only for mineral soils. However, soil moisture monitoring over the higher Northern latitudes is crucial since these regions are especially sensitive to climate change. A considerable positive feedback is expected if thawing of these extremely organic soils supports carbon decomposition and release to the atmosphere. Due to differing structural characteristics and thus varying bound water fractions, the relative permittivity of organic material is lower than that of the most mineral soils at a given water content. This assumption was verified by means of L-band relative permittivity laboratory measurements of organic and mineral substrates from various sites in Denmark, Finland, Scotland and Siberia using a resonant cavity. Based on these data, a simple empirical dielectric model for organic soils was derived and implemented in the SMOS Soil Moisture Level 2 Prototype Processor (SML2PP). Unfortunately, the current SMOS retrieved soil moisture product seems to show unrealistically low values compared to in situ soil moisture data collected from organic surface layers in North America, Europe and the Tibetan Plateau so that the impact of the dielectric model for organic soils cannot really be tested. A simplified SMOS processing scheme yielding higher soil moisture levels has recently been proposed and is presently under investigation. Furthermore, recalibration of the model parameters accounting for vegetation and roughness effects that were thus far only evaluated using the default dielectric model for mineral soils is ongoing for the "organic" L-MEB version. Additionally, in order to decide where a soil moisture retrieval using the "organic" dielectric model should be triggered, information on soil organic matter content in the soil surface layer has to be considered in the retrieval algorithm. For this purpose, SoilGrids (www.soilgrids.org) providing soil organic carbon content (SOCC) in g/kg is under study. A SOCC threshold based on the relation between the SoilGrids' SOCC and the presence of organic soil surface layers (relevant to alter the microwave L-band emissions from the land surface) in the SoilGrids' source soil profile information has to be established. In this communication, we present the current status of the above outlined studies with the objective to advance towards an improved soil moisture retrieval for organic-rich soils from SMOS passive microwave L-band observations....