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Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016

Marsing, Andreas and Jurkat-Witschas, Tina and Grooß, Jens-Uwe and Kaufmann, Stefan and Heller, Romy and Engel, Andreas and Hoor, Peter and Krause, Jens and Voigt, Christiane (2019) Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016. Atmospheric Chemistry and Physics (ACP), 19 (16), pp. 10757-10772. Copernicus Publications. doi: 10.5194/acp-19-10757-2019. ISSN 1680-7316.

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Official URL: https://www.atmos-chem-phys.net/19/10757/2019/


Activated chlorine compounds in the polar winter stratosphere drive catalytic cycles that deplete ozone and methane, whose abundances are highly relevant to the evolution of global climate. The present work introduces a novel dataset of in situ measurements of relevant chlorine species in the lowermost Arctic stratosphere from the aircraft mission POLSTRACC–GW-LCYCLE–SALSA during winter 2015/2016. The major stages of chemical evolution of the lower polar vortex are presented in a consistent series of high-resolution mass spectrometric observations of HCl and ClONO2. Simultaneous measurements of CFC-12 are used to derive total inorganic chlorine (Cly) and active chlorine (ClOx). The new data highlight an altitude dependence of the pathway for chlorine deactivation in the lowermost vortex with HCl dominating below the 380 K isentropic surface and ClONO2 prevailing above. Further, we show that the Chemical Lagrangian Model of the Stratosphere (CLaMS) is generally able to reproduce the chemical evolution of the lower polar vortex chlorine budget, except for a bias in HCl concentrations. The model is used to relate local measurements to the vortex-wide evolution. The results are aimed at fostering our understanding of the climate impact of chlorine chemistry, providing new observational data to complement satellite data and assess model performance in the climate-sensitive upper troposphere and lower stratosphere region.

Item URL in elib:https://elib.dlr.de/128976/
Document Type:Article
Title:Chlorine partitioning in the lowermost Arctic vortex during the cold winter 2015/2016
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jurkat-Witschas, TinaDLR, IPAUNSPECIFIED
Grooß, Jens-UweFZ Jülich, JülichUNSPECIFIED
Kaufmann, StefanDLR, IPAhttps://orcid.org/0000-0002-0767-1996
Engel, AndreasUniversität FrankfurtUNSPECIFIED
Hoor, PeterUniv. Mainz, MainzUNSPECIFIED
Krause, JensUniv. MainzUNSPECIFIED
Voigt, ChristianeDLR, IPAhttps://orcid.org/0000-0001-8925-7731
Date:26 August 2019
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.5194/acp-19-10757-2019
Page Range:pp. 10757-10772
Publisher:Copernicus Publications
Keywords:Chlorine chemsitry, stratosphere, Arctic polar vortex, model comparison, in situ aircraft measurements
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics
Deposited By: Marsing, Andreas
Deposited On:02 Sep 2019 08:13
Last Modified:02 Sep 2019 08:13

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