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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-1181
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
03 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Transport of Canadian forest fire smoke over the UK as observed by lidar
Geraint Vaughan1,2, Adam P. Draude2, Hugo M. A. Ricketts1,2, David M. Schultz2, Mariana Adam3,5, Jacqueline Sugier3, and David P. Wareing4 1National Centre for Atmospheric Science, University of Manchester, UK
2School of Earth and Environmental Sciences, The University of Manchester, UK
3Met Office, Exeter, UK
4Aberystwyth University, UK
5National Institute of R & D for Optoelectronics, Magurele, Romania
Abstract. Layers of aerosol at heights between 2 and 11 km were observed with Raman lidars in the UK between 23 and 31 May 2016. A network of such lidars, supported by ceilometer observations, is used to map the extent of the aerosol and its optical properties. Spaceborne lidar profiles show that the aerosol originated from forest fires over Western Canada around 17 May, and indeed the aerosol properties – weak depolarisation and a lidar ratio at 355 nm in the range 35–65 sr – were consistent with long-range transport of forest fire smoke. The event was unusual in its persistence – the smoke plume was drawn into an atmospheric block that kept it above North-west Europe for nine days. Lidar observations show how the smoke layers became optically thinner during this period, but the lidar ratio and aerosol depolarisation showed little change.

Citation: Vaughan, G., Draude, A. P., Ricketts, H. M. A., Schultz, D. M., Adam, M., Sugier, J., and Wareing, D. P.: Transport of Canadian forest fire smoke over the UK as observed by lidar, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1181, in review, 2018.
Geraint Vaughan et al.
Geraint Vaughan et al.
Geraint Vaughan et al.

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Short summary
This paper examines an event in May 2016 when smoke from forest fires in Canada reached the UK at altitudes between 3 and 11 km above the surface. Although events of this kind are fairly common in the summer months, this one was unusual because it persisted for nine days due to a stationary flow pattern that kept the smoky air from travelling away to the east. A network of lidars and ceilometers around the UK provided round-the-clock observations of the smoke event.
This paper examines an event in May 2016 when smoke from forest fires in Canada reached the UK...
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