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Discussion papers
https://doi.org/10.5194/acp-2019-557
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-557
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 14 Jun 2019

Submitted as: research article | 14 Jun 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Trapping of HCl and oxidized, organic trace-gases in growing ice at temperatures relevant for cirrus clouds

Matthias Kippenberger, Gerhard Schuster, Jos Lelieveld, and John N. Crowley Matthias Kippenberger et al.
  • Max-Planck-Institut für Chemie, Division of Atmospheric Chemistry, 55128 Mainz, Germany

Abstract. The uptake of hydrochloric acid (HCl), ethanol (C2H5OH), 1-butanol (1-C4H9OH), formic acid HC(O)OH and tri-fluoro acetic (CF3C(O)OH) acid to growing ice surfaces was investigated at temperatures between 194 and 228 K. HCl displayed extensive, continuous uptake during ice growth, which was strongly dependent on the ice growth velocity, the temperature of the ice surface and the gas phase concentration of HCl. Tri-fluoro acetic acid was also observed to be trapped in growing ice, albeit approximately an order of magnitude less efficiently than HCl, whereas the adsorption and desorption kinetics of ethanol, 1-butanol, formic acid on ice was not measurably different to that for non-growing ice, even at very large ice-growth rates. We present a parameterisation of the uptake coefficient for HCl on growing ice films (gamma_trap) and compare the results to an existing framework that describes the non-equilibrium trapping of trace gases on ice. The trapping of HCl in growing ice crystals in the atmosphere is assessed and compared to the gas- and ice-phase partitioning resulting from equilibrium surface adsorption and solubility.

Matthias Kippenberger et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Matthias Kippenberger et al.
Matthias Kippenberger et al.
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Latest update: 16 Sep 2019
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Short summary
We investigated the uptake of several traces gases to growing ice surfaces at temperatures relevant for cirrus clouds. HCl, a strong inorganic acid that ionises at the surface was efficiently trapped in the growing ice, whereas oxidised, organic trace gases (that attach to ice by hydrogen bonding) was not. HCl can be efficiently and rapidly removed from the gas-phase in super-saturated ice-clouds.
We investigated the uptake of several traces gases to growing ice surfaces at temperatures...
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