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| Titel |
Estimated total emissions of trace gases from the Canberra Wildfires of 2003: a new method using satellite measurements of aerosol optical depth & the MOZART chemical transport model |
| VerfasserIn |
C. Paton-Walsh, L. K. Emmons, S. R. Wilson |
| 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. 12 ; Nr. 10, no. 12 (2010-06-30), S.5739-5748 |
| Datensatznummer |
250008580
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| Publikation (Nr.) |
 copernicus.org/acp-10-5739-2010.pdf |
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| Zusammenfassung |
| In this paper we describe a new method for estimating trace gas emissions
from large vegetation fires using satellite measurements of aerosol optical
depth (AOD) at 550 nm, combined with an atmospheric chemical transport
model. The method uses a threshold value to screen out normal levels of AOD
that may be caused by raised dust, sea salt aerosols or diffuse smoke
transported from distant fires. Using this method we infer an estimated
total emission of 15±5 Tg of carbon monoxide, 0.05±0.02 Tg of
hydrogen cyanide, 0.11±0.03 Tg of ammonia, 0.25±0.07 Tg of
formaldehyde, 0.03±0.01 of acetylene, 0.10±0.03 Tg of
ethylene, 0.03±0.01 Tg of ethane, 0.21±0.06 Tg of formic acid
and 0.28±0.09 Tg of methanol released to the atmosphere from the
Canberra fires of 2003. An assessment of the uncertainties in the new method
is made and we show that our estimate agrees (within expected uncertainties)
with estimates made using current conventional methods of multiplying
together factors for the area burned, fuel load, the combustion efficiency
and the emission factor for carbon monoxide. A simpler estimate derived
directly from the satellite AOD measurements is also shown to be in
agreement with conventional estimates, suggesting that the method may, under
certain meteorological conditions, be applied without the complication of
using a chemical transport model. The new method is suitable for estimating
emissions from distinct large fire episodes and although it has some
significant uncertainties, these are largely independent of the
uncertainties inherent in conventional techniques. Thus we conclude that the
new method is a useful additional tool for characterising emissions from
vegetation fires. |
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