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

Johansson, Sören; Santee, Michelle L.; Grooß, Jens-Uwe; Höpfner, Michael; Braun, Marleen; Friedl-Vallon, Felix; Khosrawi, Farahnaz; Kirner, Oliver; Kretschmer, Erik; Oelhaf, Hermann; Orphal, Johannes; Sinnhuber, Björn-Martin; Tritscher, Ines; Ungermann, Jörn; Walker, Kaley A.; Woiwode, Wolfgang

doi:https://doi.org/10.5194/acp-19-8311-2019

Articles | Volume 19, issue 12

https://doi.org/10.5194/acp-19-8311-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

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

https://doi.org/10.5194/acp-19-8311-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 12

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, Michelle L. Santee, Jens-Uwe Grooß, Michael Höpfner, Marleen Braun, Felix Friedl-Vallon, Farahnaz Khosrawi, Oliver Kirner, Erik Kretschmer, Hermann Oelhaf, Johannes Orphal, Björn-Martin Sinnhuber, Ines Tritscher, Jörn Ungermann, Kaley A. Walker, and Wolfgang Woiwode

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

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.