 |
| Titel |
Interannual variability in global biomass burning emissions from 1997 to 2004 |
| VerfasserIn |
G. R. Werf, J. T. Randerson, L. Giglio, G. J. Collatz, P. S. Kasibhatla, A. F. Arellano |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 11 ; Nr. 6, no. 11 (2006-08-21), S.3423-3441 |
| Datensatznummer |
250004063
|
| Publikation (Nr.) |
 copernicus.org/acp-6-3423-2006.pdf |
|
|
|
|
|
| Zusammenfassung |
| Biomass burning represents an important source of atmospheric aerosols and
greenhouse gases, yet little is known about its interannual variability or
the underlying mechanisms regulating this variability at continental to
global scales. Here we investigated fire emissions during the 8 year period
from 1997 to 2004 using satellite data and the CASA biogeochemical model.
Burned area from 2001–2004 was derived using newly available active fire and
500 m. burned area datasets from MODIS following the approach described by
Giglio et al. (2006). ATSR and VIRS satellite data were used to extend the
burned area time series back in time through 1997. In our analysis we
estimated fuel loads, including organic soil layer and peatland fuels, and
the net flux from terrestrial ecosystems as the balance between net primary
production (NPP), heterotrophic respiration (Rh), and biomass burning,
using time varying inputs of precipitation (PPT), temperature, solar
radiation, and satellite-derived fractional absorbed photosynthetically
active radiation (fAPAR). For the 1997–2004 period, we found that on
average approximately 58 Pg C year−1 was fixed by plants as NPP, and
approximately 95% of this was returned back to the atmosphere via
Rh. Another 4%, or 2.5 Pg C year−1 was emitted by biomass
burning; the remainder consisted of losses from fuel wood collection and
subsequent burning. At a global scale, burned area and total fire emissions
were largely decoupled from year to year. Total carbon emissions tracked
burning in forested areas (including deforestation fires in the tropics),
whereas burned area was largely controlled by savanna fires that responded
to different environmental and human factors. Biomass burning emissions
showed large interannual variability with a range of more than 1 Pg C year−1,
with a maximum in 1998 (3.2 Pg C year−1) and a minimum in
2000 (2.0 Pg C year−1). |
| |
|
| Teil von |
|
|
|
|
|
|
|
|