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Lund University (2015)

Estimating and evaluating GPP in the Sahel using MSG/SEVIRI and MODIS satellite data

Wallner, Gustav

Titre : Estimating and evaluating GPP in the Sahel using MSG/SEVIRI and MODIS satellite data

Auteur : Wallner, Gustav

Université de soutenance : Lund University

Grade : Master thesis, 2015

Résumé
The aim of this study was to use data from Meteosat Second Generation’s Spinning Enhanced Visible and Infrared Imager (MSG/SEVIRI) to calculate the gross primary production (GPP) in the Sahel region of Africa for 2011 and 2012. GPP was calculated using the light use efficiency method, which relates GPP to the absorbed photosynthetically active radiation the light use efficiency. The results were compared with the widely used Moderate Resolution Imaging Spectroradiometer (MODIS) GPP product (MOD17A) and ground measurements using the eddy covariance method, from Dahra, Senegal.
The results show that MSG/SEVIRI derived GPP more accurately represent the in situ measurements from the Dahra site compared with MODIS GPP, both for short time changes and the magnitude of GPP. MODIS GPP underestimated the ground measurements during the growing season, findings which were consistent with previous studies of the Sahel. MODIS performed well during the dry season and in replicating the change of seasons

Mots clés : geography, physical geography, GPP, Sahel, Dahra, remote sensing, Meteosat, MSG, MODIS, SEVIRI

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Page publiée le 13 février 2017, mise à jour le 4 août 2018