Articles | Volume 19, issue 12
Atmos. Chem. Phys., 19, 8311–8338, 2019
https://doi.org/10.5194/acp-19-8311-2019

Special issue: The Polar Stratosphere in a Changing Climate (POLSTRACC) (ACP/AMT...

Atmos. Chem. Phys., 19, 8311–8338, 2019
https://doi.org/10.5194/acp-19-8311-2019

Research article 27 Jun 2019

Research article | 27 Jun 2019

Unusual chlorine partitioning in the 2015/16 Arctic winter lowermost stratosphere: observations and simulations

Sören Johansson et al.

Data sets

GLORIA Chemistry Mode temperature and trace gas retrievals from the POLSTRACC/GW-LCYCLEII/GWEX/SALSA campaigns 2015/2016 S. Johansson, W. Woiwode, and M. Höpfner https://doi.org/10.5445/IR/1000086506

MLS/Aura Level 2 Ozone (O3) Mixing Ratio V004 M. Schwartz, L. Froidevaux, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2012

MLS/Aura Level 2 Nitric Acid (HNO3) Mixing Ratio V004 G. Manney, M. Santee, L. Froidevaux, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2012

MLS/Aura Level 2 Hydrogen Chloride (HCl) Mixing Ratio V004 L. Froidevaux, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2010

MLS/Aura Level 2 Chlorine Monoxide (ClO) Mixing Ratio V004 M. Santee, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2004

MLS/Aura Level 2 Methyl Chloride (CH3Cl) Mixing Ratio V004 M. Santee, N. Livesey, and W. Read https://doi.org/10.5067/Aura/MLS/DATA2002

MERRA-2 inst6_3d_ana_Np: 3d,6-Hourly,Instantaneous,Pressure-Level,Analysis,Analyzed Meteorological Fields V5.12.4 Global Modeling and Assimilation Office (GMAO) https://doi.org/10.5067/A7S6XP56VZWS

HALO database HALO consortium https://doi.org/10.17616/R39Q0T

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Short summary
We present a study based on GLORIA aircraft and MLS/ACE-FTS/CALIOP satellite measurements during the Arctic winter 2015/16, which demonstrate (for the Arctic) unusual chlorine deactivation into HCl instead of ClONO2 due to low ozone abundances in the lowermost stratosphere, with a focus at 380 K potential temperature. The atmospheric models CLaMS and EMAC are evaluated, and measured ClONO2 is linked with transport and in situ deactivation in the lowermost stratosphere.
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