Anomalies for Fraction of Absorbed Photosynthetically Active Radiation (FAPAR).
The Fraction of Photosynthetically Active Radiation Absorbed (FAPAR) is used to track the overall primary productivity associated with atmospheric CO2 fixation. FAPAR anomalies relative to the average between 2003 and 2010 show large surface variations, in terms of values and coverage, of vegetation productivity conditions over Africa. Temperature and precipitation deficits are the main drivers for the negative anomalies. Each location with a negative anomaly (FAPAR value lower than the long-term mean for that location – shades of red) indicates relative vegetation stress during that 10-day interval. Each location with a positive anomaly (FAPAR value higher than long-term mean for that location – shades of green) indicates relative favourable vegetation growth conditions during that 10-day interval. FAPAR values and their anomalies provide useful information for water and agricultural management purposes.
Gobron N. Terrestrial vegetation dynamics [in “State of the Climate in 2020“]. Bulletin of the American Meteorological Society, 2021, 102 (8), p. S104-S106. DOI: 10.1175/BAMS-D-21-0098.1
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This indicator shows variations in the vegetation health and / or cover which may be due to other stress factors than rainfall or soil moisture deficits, such as plant diseases. Therefore this indicator must be used jointly with other indicators giving information on the deficit of rainfall and / or soil moisture, in order to determine if the variation in the vegetation response (FAPAR) is linked with a drought event or not.
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