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| Titel |
Cold Smoke: smoke-induced density currents cause unexpected smoke transport near large wildfires |
| VerfasserIn |
N. P. Lareau, C. B. Clements |
| 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 ; 15, no. 20 ; Nr. 15, no. 20 (2015-10-20), S.11513-11520 |
| Datensatznummer |
250120102
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| Publikation (Nr.) |
 copernicus.org/acp-15-11513-2015.pdf |
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| Zusammenfassung |
| The first observations of smoke-induced density currents originating from large
wildfires are presented. Using a novel mobile Doppler lidar and additional
in situ measurements, we document a deep (~ 2 km) smoke-filled
density current that propagates more than 25 km at speeds up to 4.5 m s−1 near a large forest fire in northern California. Based on these
observations we show that the dynamics governing the spread of the smoke
layer result from differential solar heating between the smoke-filled and
smoke-free portions of the atmospheric boundary layer. A calculation of the
theoretical density current speed agrees well with the observed propagation
speed. Additional lidar and photographic documentation of other smoke-filled
density currents demonstrate that these previously unknown phenomena are
relatively common near large wildfires and can cause severe and unexpected
smoke inundation of populated areas. |
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