Articles | Volume 21, issue 4
Atmos. Chem. Phys., 21, 2819–2836, 2021
https://doi.org/10.5194/acp-21-2819-2021
Atmos. Chem. Phys., 21, 2819–2836, 2021
https://doi.org/10.5194/acp-21-2819-2021

Research article 24 Feb 2021

Research article | 24 Feb 2021

Observational evidence of energetic particle precipitation NOx (EPP-NOx) interaction with chlorine curbing Antarctic ozone loss

Emily M. Gordon et al.

Data sets

Kyoto World Data Center for Geomagnetism http://wdc.kugi.kyoto-u.ac.jp/kp

QBO data Freie Universität Berlin https://www.geo.fu-berlin.de/en/met/ag/strat/produkte/qbo

OMI/Aura Ozone (O3) Total Column Daily L2 Global Gridded 0.25 degree x 0.25 degree V3 P. K. Bhartia https://doi.org/10.5067/Aura/OMI/DATA2025

MLS/Aura Level 2 Chlorine Monoxide (ClO) Mixing Ratio V005 M. Santee, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2505

Access to IMK/IAA generated MIPAS/Envisat data Karlsruhe Institute of Technology https://www.imk-asf.kit.edu/english/308.php

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Short summary
Energetic particle precipitation (EPP) is the rain of solar energetic particles into the Earth's atmosphere. EPP is known to deplete O3 in the polar mesosphere–upper stratosphere via the formation of NOx. NOx also causes chlorine deactivation in the lower stratosphere and has, thus, been proposed to potentially result in reduced ozone depletion in the spring. We provide the first evidence to show that NOx formed by EPP is able to remove active chlorine, resulting in enhanced total ozone column.
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