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. Layers of aerosol at heights between 2 and 11 km were observed with Ramanlidars in the UK between 23 and 31 May 2016. A network of these lidars,supported by ceilometer observations, is used to map the extent of theaerosol and its optical properties. Space-borne lidar profiles show that theaerosol originated from forest fires over western Canada around 17 May, andindeed the aerosol properties – weak volume depolarisation (  %) and alidar ratio at 355 nm in the range 35–65 sr – were consistent withlong-range transport of forest fire smoke. The event was unusual in itspersistence – the smoke plume was drawn into an atmospheric block that keptit above north-western Europe for 9 days. Lidar observations show how thesmoke layers became optically thinner during this period, but the lidar ratioand aerosol depolarisation showed little change. The results demonstrate thevalue of a dense network of observations for tracking forest fire smoke, andshow how the dispersion of smoke in the free troposphere leads to theemergence of discrete thin layers in the far field. They also show howatmospheric blocking can keep a smoke plume in the same geographic area forover a week.

Transport of Canadian forest fire smoke over the UK as observed by lidar