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Volume 15, issue 20
Atmos. Chem. Phys., 15, 11513–11520, 2015
https://doi.org/10.5194/acp-15-11513-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 15, 11513–11520, 2015
https://doi.org/10.5194/acp-15-11513-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Oct 2015

Research article | 20 Oct 2015

Cold Smoke: smoke-induced density currents cause unexpected smoke transport near large wildfires

N. P. Lareau and C. B. Clements

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Cited articles

Britter, R. E. and Simpson, J. E.: Experiments on the dynamics of a gravity current head, J. Fluid Mech., 88, 223–240, https://doi.org/10.1017/S0022112078002074, 1978.
Clements, C. B. and Oliphant, A. J.: The California State University mobile atmospheric profiling system: A facility for research and education in boundary layer meteorology, B. Am. Meteor. Soc., 95, 1713–1724, https://doi.org/10.1175/BAMS-D-13-00179.1, 2014.
Delfino, R. J., Brummel, S., Wu, J., Stern, H., Ostro, B., Lipsett, M., Winer, A., Street, D. H., Zhang, L., Tjoa, T., and Gillen, D. L.: The relationship between respiratory and cardiovascular hospital admissions to the southern California wildfires of 2003, Occup. Environ. Med., 66, 189–197, https://doi.org/10.1136/oem.2008.041376, 2009.
Fromm, M., Lindsey, D. T., Servranckx, R., Yue, G., Trickl, T., Sica, R., Doucet, P., and Godin-Beekmann, S.: The untold story of pyrocumulonimbus, B. Am. Meteor. Soc., 91, 1193–1209, https://doi.org/10.1175/2010BAMS3004.1, 2010.
Garrett, J. R., Pittock, A. B., and Walsh, K: Response of the atmospheric boundary layer and soil layer to high altitude, dense aerosol cover, J. Appl. Meteor., 29, 35–52 , https://doi.org/10.1175/1520-0450(1990)029<0035:ROTABL>2.0.CO;2, 1990.
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This paper presents first observations of smoke-induced density currents, which are a boundary-layer flow phenomenon resulting from radiative shading by wild fire smoke. Our analysis uses a mobile Doppler lidar to reveal the anatomy and evolution of one such density current in northern California. The results show that these density currents can flow counter to the ambient wind and spread over long distances (e.g. 25km), causing unexpected smoke impacts.
This paper presents first observations of smoke-induced density currents, which are a...
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