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MODIS EVI-based net primary production in the Sahel 2000–2014

Author:
  • Jonas Ardö
  • Torbern Tagesson
  • Sadegh Jamali
  • Abdelrahman Khatirc
Publishing year: 2018-03-30
Language: English
Pages: 35-45
Publication/Series: International Journal of Applied Earth Observation and Geoinformation
Volume: 65
Document type: Journal article
Publisher: Elsevier

Abstract english

Africa is facing resource problems due to increasing demand combined with potential climate-induced changes in supply. Here we aim to quantify resources in terms of net primary production (NPP [g C m−2 yr−1]) of vegetation in the Sahel region for 2000–2014.

Using time series of the enhanced vegetation index (EVI) from MODIS, NPP was estimated for the Sahel region with a 500 × 500 m spatial resolution and 8-day temporal resolution. The estimates were based on local eddy covariance flux measurements from six sites in the Sahel region and the carbon use efficiency originating from a dynamic vegetation model.

No significant NPP change was found for the Sahel as a region but, for sub-regions, significant changes, both increasing and decreasing, were observed. Substantial uncertainties related to NPP estimates and the small availability of evaluation data makes verification difficult. The simplicity of the methodology used, dependent on earth observation only, is considered an advantage.

Keywords

  • Physical Geography
  • Carbon use efficiency
  • Eddy covariance flux data
  • Resource assessment

Other

Published
  • ISSN: 1569-8432
Sadegh Jamali
E-mail: sadegh [dot] jamali [at] tft [dot] lth [dot] se

Lecturer

Transport and Roads

+46 46 222 91 39

2144

3

Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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