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| Titel |
Evaluation of the smoke-injection height from wild-land fires using remote-sensing data |
| VerfasserIn |
M. Sofiev, T. Ermakova, R. Vankevich |
| 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 ; 12, no. 4 ; Nr. 12, no. 4 (2012-02-21), S.1995-2006 |
| Datensatznummer |
250010736
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| Publikation (Nr.) |
 copernicus.org/acp-12-1995-2012.pdf |
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| Zusammenfassung |
| A new methodology for the estimation of smoke-injection height from
wild-land fires is proposed and evaluated. It is demonstrated that the
approaches developed for estimating the plume rise from stacks, such as the
formulas of G. Briggs, can be formally written in terms characterising the
wild-land fires: fire energy, size and temperature. However, these
semi-empirical methods still perform quite poorly because the physical
processes controlling the uplift of the wildfire plumes differ from those
controlling the plume rise from stacks. The proposed new methodology
considers wildfire plumes in a way similar to Convective Available Potential
Energy (CAPE) computations. The new formulations are applied to a dataset
collected within the MISR Plume Height Project for about 2000 fire plumes in
North America and Siberia. The estimates of the new method are compared with
remote-sensing observations of the plume top by the MISR instrument, with
two versions of the Briggs' plume-rise formulas, with the 1-D plume-rise
model BUOYANT, and with the prescribed plume-top position (the approach
widely used in dispersion modelling). The new method has performed
significantly better than all these approaches. For two-thirds of the cases,
its predictions deviated from the MISR observations by less than 500 m, which
is the uncertainty of the observations themselves. It is shown that the
fraction of "good" predictions is much higher (>80%) for the plumes
reaching the free troposphere. |
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