Stratospheric smoke with unprecedentedly high backscatter observed by lidars above southern France - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2018

Stratospheric smoke with unprecedentedly high backscatter observed by lidars above southern France

Sergey Khaykin
  • Function : Author
  • PersonId : 988019
Sophie Godin-Beekmann
Alain Hauchecorne
  • Function : Author
  • PersonId : 914935
Jacques Pelon
François Ravetta
  • Function : Author
  • PersonId : 971908
Philippe Keckhut
  • Function : Author
  • PersonId : 918122

Abstract

Extreme pyro-convection events triggered by wildfires in northwest Canada and U.S. during August 2017 resulted in vast injection of combustion products into the stratosphere. The plumes of stratospheric smoke were observed by lidars at Observatoire de Haute-Provence (OHP) for many weeks that followed the fires as distinct aerosol layers with backscatter reaching unprecedentedly high values for a non-volcanic aerosol layer. We use space-borne CALIPSO lidar to track the spatiotemporal evolution of the smoke plumes before their detection at OHP. A remarkable agreement between ground- and spaced-based lidars sampling the same smoke plume on a particular date allowed us to extrapolate the OHP observations to a regional scale, where CALIPSO reported extreme AOD values as high as 0.21. On a monthly time scale, the lidar observations indicate that boreal summer 2017 forest fires had a hemisphere-scale impact on stratospheric aerosol load, similar to that of moderate volcanic eruptions.
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insu-01692336 , version 1 (19-07-2020)

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Sergey Khaykin, Sophie Godin-Beekmann, Alain Hauchecorne, Jacques Pelon, François Ravetta, et al.. Stratospheric smoke with unprecedentedly high backscatter observed by lidars above southern France. Geophysical Research Letters, 2018, 45 (3), pp.1639-1646. ⟨10.1002/2017GL076763⟩. ⟨insu-01692336⟩
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