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Martian Atmospheric Chemistry of HCl: Implications for the Lifetime of Atmospheric Methane

Taysum, Benjamin and Palmer, Paul I. and Luginin, M. and Ignatiev, N. and Trokhimovskiy, A. and Shakun, A.V. and Grigoriev, A.V. and Montmessin, Franck and Korablev, O. and Olsen, K. (2023) Martian Atmospheric Chemistry of HCl: Implications for the Lifetime of Atmospheric Methane. Planet ESLAB 2023, 20-24 March 2023, Netherlands.

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We develop a 1-D atmospheric photochemistry model for Mars to interpret HCl profile measurements collected by the ACS MIR spectrometer aboard the ExoMars Trace Gas Orbiter (TGO) in Mars Year (MY) 34. We include a gas-phase chlorine chemistry scheme and study 1) surface chemistry, 2) hydrolysis, 3) photolysis, and 4) hydration and photolysis of dust grains as possible sources of gas-phase chlorine chemistry. Heterogeneous uptake of chlorine species onto water ice and minerals in Martian dust are loss processes common to all mechanisms. We drive the 1-D model using TGO profile measurements of aerosols and water vapour. Mechanisms 1, 2, 3 three result in significant model biases. Seasonal variations of Martian HCl are best reproduced by mechanism four, yielding low HCl abundances (< 1 ppb) prior to the dust season that rise to 2-6 ppb in southern latitudes during the dust season. We find that the additional Cl atoms released via mechanism four shortens the atmospheric lifetime of methane by a magnitude of 102. This suggests the production of Cl via the UV (or other electromagnetic radiation) induced breakdown of hydrated perchlorate in airborne Martian dust, consistent with observed profiles of HCl, helps reconcile observed variations of methane with photochemical models.

Item URL in elib:https://elib.dlr.de/195748/
Document Type:Conference or Workshop Item (Poster)
Title:Martian Atmospheric Chemistry of HCl: Implications for the Lifetime of Atmospheric Methane
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Taysum, BenjaminUNSPECIFIEDhttps://orcid.org/0000-0002-0856-4340137801651
Palmer, Paul I.University of Edinburgh, Edinburgh, Scotlandhttps://orcid.org/0000-0002-1487-0969UNSPECIFIED
Luginin, M.Space Research Institute (IKI), 84/32 Profsoyuznaya, 117997 Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Ignatiev, N.Space Research Institute (IKI), 117997 Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Trokhimovskiy, A.Space Research Institute, Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Shakun, A.V.Space Research Institute, Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Grigoriev, A.V.Space Research Institute, Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Montmessin, FranckLATMOS, 75252 Paris, FranceUNSPECIFIEDUNSPECIFIED
Korablev, O.Space Research Institute, Moscow, RussiaUNSPECIFIEDUNSPECIFIED
Olsen, K.School of Physical Sciences, The Open University, UKUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Mars, Hydrogen Chloride, 1-D Model, Photochemistry, Heterogeneous Reactions
Event Title:Planet ESLAB 2023
Event Location:Netherlands
Event Type:international Conference
Event Dates:20-24 March 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Taysum, Benjamin
Deposited On:30 Jun 2023 08:01
Last Modified:30 Jun 2023 08:01

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