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Article Dans Une Revue Nature Communications Année : 2023

Widespread detection of chlorine oxyacids in the Arctic atmosphere

Yee Jun Tham
Nina Sarnela
Siddharth Iyer
Qinyi Li
Lauriane L J Quéléver
  • Fonction : Auteur
Ivo Beck
  • Fonction : Auteur
Tiia Laurila
  • Fonction : Auteur
Lisa J Beck
Matthew Boyer
  • Fonction : Auteur
Javier Carmona-García
Ana Borrego-Sánchez
  • Fonction : Auteur
Daniel Roca-Sanjuán
Otso Peräkylä
Roseline C Thakur
  • Fonction : Auteur
Xu-Cheng He
Qiaozhi Zha
  • Fonction : Auteur
Dean Howard
  • Fonction : Auteur
Byron Blomquist
  • Fonction : Auteur
Stephen D Archer
Ludovic Bariteau
  • Fonction : Auteur
Kevin Posman
  • Fonction : Auteur
Jacques Hueber
  • Fonction : Auteur
Detlev Helmig
  • Fonction : Auteur
Heikki Junninen
Markku Kulmala
Anoop S Mahajan
Andreas Massling
Henrik Skov
Mikko Sipilä
  • Fonction : Auteur
Joseph S Francisco
Julia Schmale
Tuija Jokinen
Alfonso Saiz-Lopez

Résumé

Abstract Chlorine radicals are strong atmospheric oxidants known to play an important role in the depletion of surface ozone and the degradation of methane in the Arctic troposphere. Initial oxidation processes of chlorine produce chlorine oxides, and it has been speculated that the final oxidation steps lead to the formation of chloric (HClO 3 ) and perchloric (HClO 4 ) acids, although these two species have not been detected in the atmosphere. Here, we present atmospheric observations of gas-phase HClO 3 and HClO 4 . Significant levels of HClO 3 were observed during springtime at Greenland (Villum Research Station), Ny-Ålesund research station and over the central Arctic Ocean, on-board research vessel Polarstern during the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC) campaign, with estimated concentrations up to 7 × 10 6 molecule cm −3 . The increase in HClO 3 , concomitantly with that in HClO 4 , was linked to the increase in bromine levels. These observations indicated that bromine chemistry enhances the formation of OClO, which is subsequently oxidized into HClO 3 and HClO 4 by hydroxyl radicals. HClO 3 and HClO 4 are not photoactive and therefore their loss through heterogeneous uptake on aerosol and snow surfaces can function as a previously missing atmospheric sink for reactive chlorine, thereby reducing the chlorine-driven oxidation capacity in the Arctic boundary layer. Our study reveals additional chlorine species in the atmosphere, providing further insights into atmospheric chlorine cycling in the polar environment.
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Dates et versions

hal-04292735 , version 1 (17-11-2023)

Identifiants

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Yee Jun Tham, Nina Sarnela, Siddharth Iyer, Qinyi Li, Hélène Angot, et al.. Widespread detection of chlorine oxyacids in the Arctic atmosphere. Nature Communications, 2023, 14 (1), pp.1769. ⟨10.1038/s41467-023-37387-y⟩. ⟨hal-04292735⟩
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