Journal ArticleDOI
A recent greening of the Sahel—trends, patterns and potential causes
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The authors investigates the nature of a secular vegetation trend across the Sahel and discusses several potential causative factors, including increasing rainfall over the last few years, land use change and migration.About:
This article is published in Journal of Arid Environments.The article was published on 2005-11-01. It has received 547 citations till now. The article focuses on the topics: Desertification & Land use, land-use change and forestry.read more
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Journal ArticleDOI
Recent trends in vegetation dynamics in the African Sahel and their relationship to climate
TL;DR: In this article, the authors investigated temporal and spatial patterns of vegetation greenness and rainfall variability in the African Sahel and their interrelationships based on analyses of Normalized Difference Vegetation Index (NDVI) time series for the period 1982-2003 and gridded satellite rainfall estimates.
Journal ArticleDOI
Proxy global assessment of land degradation
TL;DR: In this article, the authors defined land degradation as a long-term decline in ecosystem function and productivity, which may be assessed using longterm, remotely sensed normalized difference vegetation index (NDVI) data.
Book ChapterDOI
Assessment of observed changes and responses in natural and managed systems
TL;DR: Abeku et al. as discussed by the authors presented a survey of the work of Abeku and his colleagues, including Isabelle Cote (Canada), Mark Dyurgerov (USA), Martin Edwards (UK), Kristie L. Ebi (US), Nicole Estrella (Germany), Donald L. MacMynowski (USA) and Patricia Morellato (Brazil), Jeff T. Price (USA).
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Journal ArticleDOI
Increased plant growth in the northern high latitudes from 1981 to 1991
TL;DR: In this paper, the authors present evidence from satellite data that the photosynthetic activity of terrestrial vegetation increased from 1981 to 1991 in a manner that is suggestive of an increase in plant growth associated with a lengthening of the active growing season.
Journal ArticleDOI
Climate-Driven Increases in Global Terrestrial Net Primary Production from 1982 to 1999
Ramakrishna R. Nemani,Charles D. Keeling,Hirofumi Hashimoto,Hirofumi Hashimoto,William M. Jolly,Stephen C. Piper,Compton J. Tucker,Ranga B. Myneni,Steven W. Running +8 more
TL;DR: It is indicated that global changes in climate have eased several critical climatic constraints to plant growth, such that net primary production increased 6% (3.4 petagrams of carbon over 18 years) globally.
Journal ArticleDOI
TIMESAT - a program for analyzing time-series of satellite sensor data
Per Jönsson,Lars Eklundh +1 more
TL;DR: In this article, three different least-squares methods for processing time-series of satellite sensor data are presented, one of which uses local polynomial functions and can be classified as an adaptive Savitzky-Golay filter.
Journal ArticleDOI
Modeling the Exchanges of Energy, Water, and Carbon Between Continents and the Atmosphere
Piers J. Sellers,Robert E. Dickinson,David A. Randall,Alan K. Betts,Forrest G. Hall,Joseph A. Berry,G. J. Collatz,A. S. Denning,Harold A. Mooney,Carlos A. Nobre,N. Sato,Christopher B. Field,Ann Henderson-Sellers +12 more
TL;DR: Modern schemes incorporate biogeochemical and ecological knowledge and, when coupled with advanced climate and ocean models, will be capable of modeling the biological and physical responses of the Earth system to global change, for example, increasing atmospheric carbon dioxide.