Is ozone recovering in Polar Regions during springtime? - INSU - Institut national des sciences de l'Univers
Communication Dans Un Congrès Année : 2024

Is ozone recovering in Polar Regions during springtime?

Andrea Pazmino
  • Fonction : Auteur
  • PersonId : 968970
Florence Goutail
  • Fonction : Auteur
  • PersonId : 968972
Sophie Godin-Beekmann
Alain Hauchecorne
  • Fonction : Auteur
  • PersonId : 914935
Martyn P. Chipperfield
  • Fonction : Auteur
  • PersonId : 995039
Wuhu Feng
  • Fonction : Auteur
  • PersonId : 989194
Franck Lefèvre
Michel van Roozendael
  • Fonction : Auteur
  • PersonId : 1106295
Nis Jepsen
  • Fonction : Auteur
Tove Svendby
Rigel Kivi
Kimberly Strong
  • Fonction : Auteur
  • PersonId : 981898
Kaley A Walker

Résumé

During the last decade, different extreme events have impacted the stratosphere with large spatial extents and temporal amplitudes lasting from months to years. An example is the important and devastating Australian wildfires at the turn of the year 2019/20 that were favoured by weather-related high risk conditions induced by the anthropogenic climate change [1]. Tencé et al. [2] observed carbonaceous aerosol plumes by lidar over Dumont d’Urville Antarctic station in 2020. Coincident ozone sonde measurements showed low values compared to typical years. The impact of such extreme events needs to be contrasted with the long-term evolution of the ozone layer to evaluate their importance. Despite the first evidence of a statistically significant increase of total ozone over Antarctica during September, in the middle of the depletion period, observed by Solomon et al. in 2016 [3], wildfires can affect the winter-spring polar stratosphere and extend the lifetime of the Antarctic ozone hole [4]. In this study, the long dataset of ozone loss derived from measurements (multi-sensor reanalysis combined with SAOZ ground-based network observations) and passive ozone tracer simulated by chemical-transport model (CTM) SLIMCAT are used to evaluate the ozone recovery over the polar regions. The ozone loss is obtained by applying the passive tracer method [5]. The loss is computed at each polar station by subtracting the measured total ozone (SAOZ and MSR2 merged dataset) when the station is inside the polar vortex, from the corresponding passive ozone column simulated by SLIMCAT. Three metrics are used in trend analyses in order to assess the ozone recovery rate over both polar regions: (1) The maximum ozone loss at the end of the winter, (2) the onset day of ozone loss reaching a specific threshold, and (3) the ozone loss residuals computed from the differences between annual ozone loss and ozone loss values regressed with respect to sunlit volume of polar stratospheric clouds (VPSC). A trend since 2000 is calculated for each metric. In the Antarctic, the three metrics present significant trends confirming the recovery of ozone in that region. In the Arctic, the two first metrics do not present significant results while the third one provides a significant negative trend of the residual ozone loss at the 2s level showing a potential quantitative detection of ozone recovery in the Arctic springtime lower stratosphere. For further details, please see Pazmiño et al., 2023 [6].
Fichier non déposé

Dates et versions

insu-04637305 , version 1 (05-07-2024)

Identifiants

  • HAL Id : insu-04637305 , version 1

Citer

Andrea Pazmino, Florence Goutail, Sophie Godin-Beekmann, Alain Hauchecorne, Martyn P. Chipperfield, et al.. Is ozone recovering in Polar Regions during springtime?. The 36th Quadrennial Ozone Symposium 2024, Jul 2024, Boulder, United States. ⟨insu-04637305⟩
27 Consultations
0 Téléchargements

Partager

More