![CNES - Centre National d'Etudes Spatiales](https://media.trabajo.org/img/noimg.jpg)
24-009 Satellite Observations in Support to 250 M
Il y a 2 mois
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Continental biosphere
**Mission**:
The first part of the PhD consists in the assimilation of Snow Cover Fractions derived from optical imagery. To take benefit from operational processing chains already operated by CESBIO, CNES, and Meteo-France, the complementarity between the high resolution of Copernicus/Sentinel-2 (Gascoin et al., 2019) and the high temporal repetitivity of NASA/VIIRS will be investigated. This step requires (1) an accurate quantification of observation error that will be achieved by the comparison between both products on a long archive, (2) the implementation of state-of-the-art parameterizations of Snow Cover Fraction as observation operators (Helbig et al., 2021), (3) a calibration of the spatial propagation allowed by the k-local particle filter assimilation algorithm, as snow coverage information on certain pixels can inform on the realism of the snowpack state on other pixels. Evaluations will be done by cross-validation among available observations and with independant data such as snow heights from Pléiades stereo-imagery (Deschamps-Berger et al., 2020).
As Snow Cover Fractions are mainly informative at the very beginning and at the end of the snow season, in a second time, the complementary assimilation of snow height products will be considered. The C-Snow product (Lievens et al., 2022) derived from Sentinel-1 will be assimilated after a detailed quantification of observation error.
This project will provide an assimilation framework that can realistically run operationnally at the end of the PhD and open the door to the assimilation of more challenging observations in the future : snow heights from ICESat-2 (Deschamps-Berger et al., 2023), wet snow fraction from Sentinel-1 (Karbou et al., 2021), broadband albedo from Sentinel-3 (Sanchez-Zapero et al., 2023), optical reflectances with enhanced topographic corrections (Lamare et al., 2020), surface temperatures from TRISHNA. It combines an innovative scientific approach with fast operational prospects and will answer to the increasing needs of winter mountain skateholders in the context of climate change and challenging energy supply.
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**Profil**:
Master in environmental sciences or remote sensing. Expected skills in numerical modelling, snow sciences, or data assimilation.
**LABORATOIRE**:
LABO CEN
**Message de PhD**:
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