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Vegetation index trends for the African Sahel 1982–1999
Author(s) -
Eklundh Lars,
Olsson Lennart
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2002gl016772
Subject(s) - normalized difference vegetation index , vegetation (pathology) , environmental science , solar zenith angle , pathfinder , climatology , vegetation index , period (music) , satellite , physical geography , geography , climate change , remote sensing , geology , medicine , oceanography , physics , pathology , aerospace engineering , library science , computer science , acoustics , engineering
Pathfinder AVHRR NDVI data have been analyzed for the African Sahel to study recent trends in vegetation greenness. A strong increase in seasonal NDVI was observed over large areas in the Sahel during the period 1982–1999. The increase is interpreted as a vegetation recovery from the drought periods of the 1980's. Although strong shifts in satellite overpass times have led to shifting solar zenith angles (SZA) over the time period, only minimal influence of SZA's on the Pathfinder NDVI was found in our data. A preliminary analysis of rainfall data indicates increasing rainfall during the period. The observed trends may have important implications to the Sahel including changes to the water cycle, energy exchange and carbon storage.