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Lund University (2014)

Polynomial trends of vegetation phenology in Sahelian to equatorial Africa using remotely sensed time series from 1983 to 2005

Veysipanah, Mozafar

Titre : Polynomial trends of vegetation phenology in Sahelian to equatorial Africa using remotely sensed time series from 1983 to 2005

Auteur : Veysipanah, Mozafar

Université de soutenance : Lund University

Grade : Master thesis, 2014

Présentation
Global warming has both short and long term effects on seasonal phenological cycles of vegetation. Phenology parameters of vegetation such as start, end, length and amplitude of season can describe life cycle events of vegetation. In this thesis, long-term dataset of GIMMS NDVI time series from 1983 to 2005 was used to extract and analyze vegetation phenology over Sahelian to equatorial areas and TIMESAT software package was used as an automated method to extract the parameters. The overall aim of this thesis was to study vegetation changes through analysis of polynomial trends of phenology parameters. Phenology parameters were analyzed to detect hidden changes in vegetation dynamics. Through comparing polynomial trends of vegetation parameters and soil moisture, the relationship between the phenology parameters and soil moisture was detected and the role of climate driver forces (including land cover, soil texture and rainfall) behind the changes in phenology parameters were investigated.

Mots clés : TIMESAT, remote sensing, GIMMS NDVI, Physical Geography and Ecosystem analysis, Sahel, phenology parameters, polynomial trends, vegetation, soil moisture

Présentation

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Page publiée le 17 décembre 2016, mise à jour le 4 août 2018