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Temporal and spatial variability of aerosol optical depth in the Sahel region in relation to vegetation remote sensingIn order to monitor the aerosol characteristics needed for atmospheric correction of remotely sensed data, a network of sun photometers was established in the Sahel region of Senegal, Mali, and Niger. Data analysis suggests that there is a high spatial variability of the aerosol optical thickness tau(a) in the western Sahel region. At a 67 percent confidence level the instantaneous values of tau(a) can be extrapolated approximately 270-400 km with an error tolerance of 50 percent. Spatial variability in the dry season is found to be of a similar magnitude. The ranges of variations in the NDVI in the Sahel region are shown to be approximately 0.02 and 0.01, respectively, due to commonly observed fluctuations in the aerosol optical thickness and aerosol size distribution.
Document ID
19910056461
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Holben, B. N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fraser, R. S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eck, T. F.
(NASA Goddard Space Flight Center; ST Systems Corp. Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1991
Publication Information
Publication: International Journal of Remote Sensing
Volume: 12
ISSN: 0143-1161
Subject Category
Earth Resources And Remote Sensing
Accession Number
91A41084
Distribution Limits
Public
Copyright
Other

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