Assimilation of Sentinel-2 data into a snowpack model in the High Atlas of Morocco - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Remote Sensing Année : 2018

Assimilation of Sentinel-2 data into a snowpack model in the High Atlas of Morocco

M.W. Baba
  • Fonction : Auteur

Résumé

The snow melt from the High Atlas is a critical water resource in Morocco. In spite of its importance, monitoring the spatio-temporal evolution of key snow cover properties like the snow water equivalent remains challenging due to the lack of in situ measurements at high elevation. Since 2015, the Sentinel-2 mission provides high spatial resolution images with a 5 day revisit time, which offers new opportunities to characterize snow cover distribution in mountain regions. Here we present a new data assimilation scheme to estimate the state of the snowpack without in situ data. The model was forced using MERRA-2 data and a particle filter was developed to dynamically reduce the biases in temperature and precipitation using Sentinel-2 observations of the snow cover area. The assimilation scheme was implemented using SnowModel, a distributed energy-balance snowpack model and tested in a pilot catchment in the High Atlas. The study period covers 2015-2016 snow season which corresponds to the first operational year of Sentinel-2A, therefore the full revisit capacity was not yet achieved. Yet, we show that the data assimilation led to a better agreement with independent observations of the snow height at an automatic weather station and the snow cover extent from MODIS. The performance of the data assimilation scheme should benefit from the continuous improvements of MERRA-2 reanalysis and the full revisit capacity of Sentinel-2.
Fichier principal
Vignette du fichier
Publis18-cesbio_002_1.pdf (2.39 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02351621 , version 1 (26-05-2020)

Licence

Paternité

Identifiants

Citer

M.W. Baba, Simon Gascoin, L. Hanich. Assimilation of Sentinel-2 data into a snowpack model in the High Atlas of Morocco. Remote Sensing, 2018, 10 (12), ⟨10.3390/rs10121982⟩. ⟨hal-02351621⟩
38 Consultations
47 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More