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AVHRR Derived Phenological Change in the Sahel and Soudan, Africa, 1982 - 2005

Heumann, Ben; Seaquist, Jonathan LU ; Eklundh, Lars LU and Jönsson, Per (2007) In Remote Sensing of Environment 108(4). p.385-392
Abstract
The Sahel region of Africa has experienced a decrease in rainfall from the early 1960s to mid 1990s. Recent studies have detected an increased in NDVI amplitude and growing season integrated NDVI for the region since 1982. However, these studies have not examined how plant phenology has changed. Phenology examines life cycle events such as bud burst and leaf senescence. Using the software TIMESAT to estimate phenological parameters from the GlMMS AVHRR NDVI dataset, we have found significant positive trends for the length of the growing and end of the growing season for the Soudan and Guinean regions, but significant trends in the Sahel could not be detected. The geographical extent of these trends contrasts with the more northern extent... (More)
The Sahel region of Africa has experienced a decrease in rainfall from the early 1960s to mid 1990s. Recent studies have detected an increased in NDVI amplitude and growing season integrated NDVI for the region since 1982. However, these studies have not examined how plant phenology has changed. Phenology examines life cycle events such as bud burst and leaf senescence. Using the software TIMESAT to estimate phenological parameters from the GlMMS AVHRR NDVI dataset, we have found significant positive trends for the length of the growing and end of the growing season for the Soudan and Guinean regions, but significant trends in the Sahel could not be detected. The geographical extent of these trends contrasts with the more northern extent of positive trends of NDVI amplitude and growing season integrated NDVI. Results suggest two types of "greening" trends associated with rainfall change since the drought in the early 1980s. (c) 2006 Elsevier Inc. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Africa, TIMESAT, AVHRR NDVI time series, Sahel, phenology
in
Remote Sensing of Environment
volume
108
issue
4
pages
385 - 392
publisher
Elsevier
external identifiers
  • wos:000247127800004
  • scopus:34248203005
ISSN
0034-4257
DOI
10.1016/j.rse.2006.11.025
language
English
LU publication?
yes
id
8ab9b66d-be23-466c-a991-2a1ca84b9ba8 (old id 694790)
date added to LUP
2007-12-14 12:20:48
date last changed
2017-10-01 03:36:58
@article{8ab9b66d-be23-466c-a991-2a1ca84b9ba8,
  abstract     = {The Sahel region of Africa has experienced a decrease in rainfall from the early 1960s to mid 1990s. Recent studies have detected an increased in NDVI amplitude and growing season integrated NDVI for the region since 1982. However, these studies have not examined how plant phenology has changed. Phenology examines life cycle events such as bud burst and leaf senescence. Using the software TIMESAT to estimate phenological parameters from the GlMMS AVHRR NDVI dataset, we have found significant positive trends for the length of the growing and end of the growing season for the Soudan and Guinean regions, but significant trends in the Sahel could not be detected. The geographical extent of these trends contrasts with the more northern extent of positive trends of NDVI amplitude and growing season integrated NDVI. Results suggest two types of "greening" trends associated with rainfall change since the drought in the early 1980s. (c) 2006 Elsevier Inc. All rights reserved.},
  author       = {Heumann, Ben and Seaquist, Jonathan and Eklundh, Lars and Jönsson, Per},
  issn         = {0034-4257},
  keyword      = {Africa,TIMESAT,AVHRR NDVI time series,Sahel,phenology},
  language     = {eng},
  number       = {4},
  pages        = {385--392},
  publisher    = {Elsevier},
  series       = {Remote Sensing of Environment},
  title        = {AVHRR Derived Phenological Change in the Sahel and Soudan, Africa, 1982 - 2005},
  url          = {http://dx.doi.org/10.1016/j.rse.2006.11.025},
  volume       = {108},
  year         = {2007},
}