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Lars Eklundh

Professor

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Exploring the potential of MODIS EVI for modeling gross primary production across African ecosystems

Författare

  • Martin Sjöström
  • Jonas Ardö
  • Almut Arneth
  • N. Boulain
  • B. Cappelaere
  • Lars Eklundh
  • A. de Grandcourt
  • W.L. Kutsch
  • L. Merbold
  • Y. Nouvellon
  • R.J. Scholes
  • Per Schubert
  • Jonathan Seaquist
  • E.M. Veenendaal
Visa allt

Summary, in English

One of the most frequently applied methods for integrating controls on primary production through satellite data is the light use efficiency (LUE) approach, which links vegetation gross or net primary productivity (GPP or NPP) to remotely-sensed estimates of absorbed photosynthetically active radiation (APAR). Eddy covariance towers provide continuous measurements of carbon flux, presenting an opportunity for evaluation of satellite estimates of GPP. Here we investigate relationships between eddy covariance estimated GPP, environmental variables and the enhanced vegetation index (EVI) from the Moderate Resolution Imaging Spectroradiometer (MODIS) across African savanna ecosystems. EVI was found to correlate well with estimated GPP on a site-by-site basis. Combining EVI with tower-measured PAR and evaporative fraction (EF, a measure of water sufficiency) improved the direct relationship between GPP and EVI at the majority of the sites. The slope of this relationship was strongly related to site peak leaf area index (LAI). These results are promising for the extension of GPP through the use of remote sensing data to a regional or even continental scale.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system
  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2011

Språk

Engelska

Sidor

1081-1089

Publikation/Tidskrift/Serie

Remote Sensing of Environment

Volym

115

Issue

4

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Physical Geography

Nyckelord

  • Gross primary production (GPP)
  • Africa
  • Evaporative fraction (EF)
  • Enhanced vegetation index (EVI)
  • Leaf area index (LAI)
  • Moderate Resolution Imaging Spectroradiometer (MODIS)

Status

Published

Forskningsgrupp

  • remote sensing

ISBN/ISSN/Övrigt

  • ISSN: 0034-4257