@misc{10481/81680,
year = {2023},
month = {3},
url = {https://hdl.handle.net/10481/81680},
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 (HClO3) and perchloric (HClO4) acids, although these two species have not been detected in the atmosphere. Here, we present atmospheric observations of gas-phase HClO3 and HClO4. Significant levels of HClO3 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 × 106 molecule cm−3. The increase in HClO3, concomitantly with that in HClO4, was linked to the increase in bromine levels. These observations indicated that bromine chemistry enhances the formation of OClO, which is subsequently oxidized into HClO3 and HClO4 by hydroxyl radicals. HClO3 and HClO4 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},
organization = {National Natural Science Foundation
of China (42175118)},
organization = {European Research Council Executive
Agency under the European Union’s Horizon 2020 Research and Innovation
Program (Project ERC-2016-COG726349 CLIMAHAL, ERC-StG
GASPARCON - grant agreement no. 714621},
organization = {The EMME-CARE project –
grant agreement no. 856612, and grant no. 101002728, ATM-GTP Contract
No. 742206)},
organization = {Climate Relevant interactions and feedbacks: the key
role of sea ice and Snow in the polar and global climate system(CRiceS,
grant number 101003826)},
organization = {Horizon Europe project Non-CO2 Forcers
and their Climate, Weather, Air Quality and Health Impacts, (FOCI, project
number 101056783)},
organization = {ACCC Flagship funded by the Academy of
Finland grant no. 337549},
organization = {Academy professorship funded by the
Academy of Finland (grant no. 302958},
organization = {Academy of Finland (project
nos. 296628, 328290, 311932, 316114, 325647, 325681, 334792, 337549,
329274, 333397, 328616, 1325656, 347782, 349659, and 334514)},
organization = {Academy of Finland (project
nos. 296628, 328290, 311932, 316114, 325647, 325681, 334792, 337549,
329274, 333397, 328616, 1325656, 347782, 349659, and 334514)},
organization = {United States National Science Foundation (grant nos. 1807496 and
1807163),},
organization = {Swiss National Science Foundation (grant 200021_188478)},
organization = {Swiss Polar Institute (grant no. DIRCR-2018-004},
organization = {The
Ingvar Kamprad Chair for Extreme Environments Research, sponsored
by Ferring Pharmaceuticals},
organization = {La Caixa” Foundation
(ID 100010434) for the fellowship LCF/BQ/DR20/11790027},
organization = {Spanish “Ministerio de Ciencia e Innovación (MICINN)”
for funding (Project ref. CTQ2017-87054-C2-2-P,},
organization = {Unit of Excellence
María de Maeztu CEX2019-000919-M and “Ramón y Cajal” grant RYC-
2015-19234},
organization = {International Multidisciplinary drifting
Observatory for the Study of Arctic Climate (MOSAiC) expedition with
the MOSAiC20192020 tag, with activities supported by Polarstern76
expedition AWI_PS122_00},
organization = {National Oceanic and Atmospheric Administration (NOAA) Air Resources
Laboratory (ARL) for the provision of the Hybrid Single-Particle
Lagrangian Integrated Trajectory (HYSPLIT) transport and dispersion
model and/or Real-time Environmental Applications and Display sYstem
(READY)},
publisher = {Springer Nature},
title = {Widespread detection of chlorine oxyacids in the Arctic atmosphere},
doi = {10.1038/s41467-023-37387-y},
author = {Jun Tham, Yee and Borrego Sánchez, Ana María},
}