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| Titel |
OMI and MODIS observations of the anomalous 2008–2009 Southern Hemisphere biomass burning seasons |
| VerfasserIn |
O. Torres, Z. Chen, H. Jethva, C. Ahn, S. R. Freitas, P. K. Bhartia |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 8 ; Nr. 10, no. 8 (2010-04-16), S.3505-3513 |
| Datensatznummer |
250008354
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| Publikation (Nr.) |
 copernicus.org/acp-10-3505-2010.pdf |
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| Zusammenfassung |
| Significant inter-annual variability of biomass burning was observed in
South America over the 2007–2009 period. The 2007 number of fires detected
from space in South America, as well as the magnitude of the atmospheric
aerosol load resulting from fire activity, was the largest over the last ten
years. The huge 2007 increase in fire activity was followed by large
reductions in the 2008 and 2009 burning seasons. Large drops of the
atmospheric load of carbonaceous aerosols over the subcontinent, relative to
previous years, was registered in 2008 and 2009 by the OMI sensor onboard
the Aura platform, and the MODIS sensors on the Terra and Aqua satellites.
The 2009 fire season in South America was the least active of the last ten
years. Satellite observations of fire statistics, precipitation, and aerosol
optical depth data were used to analyze the fire season over South America
and Central Africa during the last ten years to understand the factors that
led to the 2007 and 2009 extremes. An analysis of precipitation anomaly data
shows that the largest 6-month (May–October) precipitation deficit of the
last ten years in South America occurred during 2007. The same analysis
indicates that in 2009, this region experienced the largest excess
precipitation of the decade. Since precipitation is the most important
meteorological factor controlling biomass burning activity, it can be
concluded that the 2007 maximum and 2009 minimum in fire activity and
aerosol load were driven by the observed levels of precipitation. Analysis
of the precipitation record, however, does not explain the extremely low
2008 biomass burning activity. Although the 2008 precipitation deficit was
similar in magnitude to the one that in 2005 contributed to the second most
intense biomass burning season in the last ten years, the 2008 fire season
was surprisingly weak. The combined analysis of satellite data on
atmospheric aerosol load, fire counts and precipitation strongly suggests
that the observed 2008 decline in aerosol load and fire activity in South
America was heavily influenced by conditions other than meteorological factors. |
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