# Stratospheric impact of the anomalous 2023 Canadian wildfires

Sergey Khaykin, Sophie Godin-Beekmann, Slimane Bekki, Florent Tencé, Mehdi Meziane, Beatrice Josse, Sophie Pelletier, Qiaoyun Hu, Philippe Goloub, Alexandra Laeng

► To cite this version:

Sergey Khaykin, Sophie Godin-Beekmann, Slimane Bekki, Florent Tencé, Mehdi Meziane, et al. Stratospheric impact of the anomalous 2023 Canadian wildfires. EGU General Assembly 2024, Apr 2024, Vienna, Austria. pp.EGU24-5686, 10.5194/egusphere-egu24-5686 . insu-04507984

HAL Id: insu-04507984

https://insu.hal.science/insu-04507984

Submitted on 4 Jun 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Stratospheric impact of the anomalous 2023 Canadian wildfires

Sergey Khaykin, Sophie Godin-Beekmann, Slimane Bekki, Florent Tencé, Mehdi Meziane, Béatrice Josse, Sophie Pelletier, Qiaoyun Hu, Philippe Goloub, Alexandra Laeng

► To cite this version:

Sergey Khaykin, Sophie Godin-Beekmann, Slimane Bekki, Florent Tencé, Mehdi Meziane, et al. Stratospheric impact of the anomalous 2023 Canadian wildfires. EGU General Assembly 2024, Apr 2024, Vienna, Austria. pp.EGU24-5686, 10.5194/egusphere-egu24-5686 . insu-04507984

HAL Id: insu-04507984

https://insu.hal.science/insu-04507984v1

Submitted on 4 Jun 2024

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
<figure><img src="image_2.png" /></figure>

# Stratospheric impact of the anomalous 2023 Canadian wildfires

Sergey Khaykin<fnref n="1" />, Sophie Godin-Beekmann<fnref n="1" />, Slimane Bekki<fnref n="1" />, Florent Tence<fnref n="1" />, Mehdi Meziane<fnref n="2" />, Beatrice Josse<fnref n="2" />, Sophie Pelletier<fnref n="2" />, Qiaoyun Hu<fnref n="3" />, Philippe Goloub<fnref n="3" />, and Alexandra Laeng<fnref n="4" />

The frequency of extreme wildfires has increased as a response to the regional and global warming trends and there is an emerging realization of their impact on climate through emissions of smoke aerosols into the stratosphere. The 2023 wildfire season in Canada was unprecedented in terms of its duration, burned area and cumulative fire power, rendering it the most destructive ever recorded.

Here we use various satellite observations (TROPOMI, OMPS-LP, OMPS-NM, MLS, CALIPSO, SAGE III) to quantify the stratospheric emissions of smoke aerosols and carbon monoxide by the 2023 Canadian wildfires and to characterize the long-range transport of smoke plumes in the stratosphere. Using multiwavelength lidar observations in Northern France, we show systematically distinct microphysical properties of UTLS smoke aerosols compared to their free-tropospheric counterparts.

The analysis of satellite data reveals multiple episodes of smoke intrusions into the stratosphere through pyroconvection (PyroCb) and synoptic-scale processes (warm conveyor belt, WCB). Model simulations using MOCAGE chemistry-transport model, which included emission data from GFAS (Global Fire Assimilation System) are shown to accurately capture the synoptic-scale uplift of smoke into the UTLS and reproduce the spatial evolution of the aerosol plumes.

We show that the multiple episodes of wildfire-driven stratospheric intrusions during Boreal Summer 2023 through PyroCb and WCB mechanisms are altogether responsible for the record-high and persistent season-wide smoke pollution at the commercial aircraft cruising altitudes and the lowermost stratosphere.

<footnote n="1">¹LATMOS, CNRS/INSU, UVSQ, Sorbonne university, Guyancourt, France (sergey.khaykin@latmos.ipsl.fr)</footnote>

<footnote n="2">²CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France</footnote>

<footnote n="3">³LOA - Laboratoire d'Optique Atmosphérique, CNRS, University of Lille, Lille, France</footnote>

<footnote n="4">⁴Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany</footnote>
<figure><img src="image_2.png" /></figure>

# Stratospheric impact of the anomalous 2023 Canadian wildfires

Sergey Khaykin<fnref n="1" />, Sophie Godin-Beekmann<fnref n="1" />, Slimane Bekki<fnref n="1" />, Florent Tence<fnref n="1" />, Mehdi Meziane<fnref n="2" />, Beatrice Josse<fnref n="2" />, Sophie Pelletier<fnref n="2" />, Qiaoyun Hu<fnref n="3" />, Philippe Goloub<fnref n="3" />, and Alexandra Laeng<fnref n="4" />

The frequency of extreme wildfires has increased as a response to the regional and global warming trends and there is an emerging realization of their impact on climate through emissions of smoke aerosols into the stratosphere. The 2023 wildfire season in Canada was unprecedented in terms of its duration, burned area and cumulative fire power, rendering it the most destructive ever recorded.

Here we use various satellite observations (TROPOMI, OMPS-LP, OMPS-NM, MLS, CALIPSO, SAGE III) to quantify the stratospheric emissions of smoke aerosols and carbon monoxide by the 2023 Canadian wildfires and to characterize the long-range transport of smoke plumes in the stratosphere. Using multiwavelength lidar observations in Northern France, we show systematically distinct microphysical properties of UTLS smoke aerosols compared to their free-tropospheric counterparts.

The analysis of satellite data reveals multiple episodes of smoke intrusions into the stratosphere through pyroconvection (PyroCb) and synoptic-scale processes (warm conveyor belt, WCB). Model simulations using MOCAGE chemistry-transport model, which included emission data from GFAS (Global Fire Assimilation System) are shown to accurately capture the synoptic-scale uplift of smoke into the UTLS and reproduce the spatial evolution of the aerosol plumes.

We show that the multiple episodes of wildfire-driven stratospheric intrusions during Boreal Summer 2023 through PyroCb and WCB mechanisms are altogether responsible for the record-high and persistent season-wide smoke pollution at the commercial aircraft cruising altitudes and the lowermost stratosphere.

<footnote n="1">¹LATMOS, CNRS/INSU, UVSQ, Sorbonne university, Guyancourt, France (sergey.khaykin@latmos.ipsl.fr)</footnote>

<footnote n="2">²CNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, France</footnote>

<footnote n="3">³LOA - Laboratoire d'Optique Atmosphérique, CNRS, University of Lille, Lille, France</footnote>

<footnote n="4">⁴Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany</footnote>