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| Titel |
Annual and diurnal african biomass burning temporal dynamics |
| VerfasserIn |
G. Roberts, M. J. Wooster, E. Lagoudakis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 5 ; Nr. 6, no. 5 (2009-05-15), S.849-866 |
| Datensatznummer |
250003747
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| Publikation (Nr.) |
 copernicus.org/bg-6-849-2009.pdf |
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| Zusammenfassung |
| Africa is the single largest continental source of biomass
burning emissions. Here we conduct the first analysis of one full year of
geostationary active fire detections and fire radiative power data recorded
over Africa at 15-min temporal interval and a 3 km sub-satellite spatial
resolution by the Spinning Enhanced Visible and Infrared Imager (SEVIRI)
imaging radiometer onboard the Meteosat-8 satellite. We use these data to
provide new insights into the rates and totals of open biomass burning over
Africa, particularly into the extremely strong seasonal and diurnal cycles
that exist across the continent. We estimate peak daily biomass combustion
totals to be 9 and 6 million tonnes of fuel per day in the northern and
southern hemispheres respectively, and total fuel consumption between
February 2004 and January 2005 is estimated to be at least 855 million
tonnes. Analysis is carried out with regard to fire pixel temporal
persistence, and we note that the majority of African fires are detected
only once in consecutive 15 min imaging slots. An investigation of the
variability of the diurnal fire cycle is carried out with respect to 20
different land cover types, and whilst differences are noted between land
covers, the fire diurnal cycle characteristics for most land cover type are
very similar in both African hemispheres. We compare the Fire Radiative
Power (FRP) derived biomass combustion estimates to burned-areas, both at
the scale of individual fires and over the entire continent at a 1-degree
scale. Fuel consumption estimates are found to be less than 2 kg/m2 for
all land cover types noted to be subject to significant fire activity, and
for savanna grasslands where literature values are commonly reported the
FRP-derived median fuel consumption estimate of 300 g/m2 is well within
commonly quoted values. Meteosat-derived FRP data of the type presented here
is now available freely to interested users continuously and in near
real-time for Africa, Europe and parts of South America via the EUMETSAT
(European Organisation for the Exploitation of Meteorological Satellites)
Land Surface Analysis Satellite Applications Facility (http://landsaf.meteo.pt/). Continuous generation of these products will
allow the types of analysis presented in this paper to be improved and
extended, and such multi-year records should allow relationships between
climate, fire and fuel to be further examined. |
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