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Communication Dans Un Congrès Année : 2024

Exploring the effects of wildfires on stratospheric aerosol composition and dynamics using satellite and ground-based lidars

Résumé

The severity of wildfires has remarkably increased over the last years in both Northern and Southern hemispheres and there is an emerging realization of their effect on climate and ozone layer. Intense wildfires give rise to extreme thunderstorms termed PyroCb, which can inject significant amounts of smoke into the stratosphere. A number of recent studies have demonstarted that the effects of strong PyroCb outbreaks on the global stratosphere can rival those of moderate volcanic eruptions in terms of magnitude and duration whilst exceeding them in terms of radiative forcing. Furthermore, the PyroCb injections into the stratosphere were shown to generate persistent synoptic-scale anticyclones (SCV – Smoke-Charged Vortex), lofting confined bubbles of smoke deep into the stratosphere due to solar heating of carbonaceous aerosols, which prolongs their atmospheric residence time and radiative effects. Here we exploit a synergy of satellite and ground-based lidar observations to characterize the impact of PyroCb on the stratospheric aerosol composition and dynamics. We use CALIOP observations of aerosol backscatter and depolarization to characterize the optical properties of stratospheric smoke aerosols, their evolution and longevity. Additionally, we use multi-decade aerosol lidar records at the French Observatoire de Haute Provence (43.9 N) and Lauder observatory in New Zealand (45.0 S), both located downwind of the main sources of PyroCb activity. Using the long-term ground-based and satellite lidar observations of depolarization, we point out the longevity of fine smoke particles in the stratosphere. The multi-wavelength fluorescence lidar observations at the French LILAS site are used to constrain the optical properties of stratospheric smoke plumes, which provides an accurate reference for estimating the radiative forcing of persistent smoke plumes in the stratosphere. Finally, the global wind profiling, exclusively provided by Aeolus Doppler lidar, is used to explore the dynamics of the rotating smoke plumes and related generation of downward- propagating gravity waves
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Dates et versions

insu-04599628 , version 1 (03-06-2024)

Identifiants

  • HAL Id : insu-04599628 , version 1

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Sergey Khaykin, Bernard Legras, Artem G. Feofilov, Oceane Soares, Sophie Godin-Beekmann, et al.. Exploring the effects of wildfires on stratospheric aerosol composition and dynamics using satellite and ground-based lidars. CALIPSO International Symposium on Spaceborne Lidar, Jun 2024, Saint Malo, France. ⟨insu-04599628⟩
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