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Title: The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010
Authors: Whalley, L.K.Stone, D.George, I.J.Mertes, S.van Pinxteren, D.Tilgner, A.Herrmann, H.Evans, M.J.Heard, D.E.
Publishers version: https://doi.org/10.5194/acp-15-3289-2015
URI: https://doi.org/10.34657/1335
https://oa.tib.eu/renate/handle/123456789/287
Issue Date: 2015
Published in: Atmospheric Chemistry and Physics, Volume 15, Issue 6, Page 3289-3301
Publisher: München : European Geopyhsical Union
Abstract: The potential for chemistry occurring in cloud droplets to impact atmospheric composition has been known for some time. However, the lack of direct observations and uncertainty in the magnitude of these reactions led to this area being overlooked in most chemistry transport models. Here we present observations from Mt Schmücke, Germany, of the HO2 radical made alongside a suite of cloud measurements. HO2 concentrations were depleted in-cloud by up to 90% with the rate of heterogeneous loss of HO2 to clouds necessary to bring model and measurements into agreement, demonstrating a dependence on droplet surface area and pH. This provides the first observationally derived assessment for the uptake coefficient of HO2 to cloud droplets and was found to be in good agreement with theoretically derived parameterisations. Global model simulations, including this cloud uptake, showed impacts on the oxidising capacity of the troposphere that depended critically on whether the HO2 uptake leads to production of H2O2 or H2O.
Keywords: atmospheric modeling; cloud cover; cloud droplet; concentration (composition); hydroxyl radical; troposphere
Type: article; Text
Publishing status: publishedVersion
DDC: 550
License: CC BY 3.0 Unported
Link to license: https://creativecommons.org/licenses/by/3.0/
Appears in Collections:Geowissenschaften

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Whalley, L.K., D. Stone, I.J. George, S. Mertes, D. van Pinxteren, A. Tilgner, H. Herrmann, M.J. Evans and D.E. Heard, 2015. The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010. 2015. München : European Geopyhsical Union
Whalley, L. K., Stone, D., George, I. J., Mertes, S., van Pinxteren, D., Tilgner, A., Herrmann, H., Evans, M. J. and Heard, D. E. (2015) “The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010.” München : European Geopyhsical Union. doi: https://doi.org/10.5194/acp-15-3289-2015.
Whalley L K, Stone D, George I J, Mertes S, van Pinxteren D, Tilgner A, Herrmann H, Evans M J, Heard D E. The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010. München : European Geopyhsical Union; 2015.
Whalley, L. K., Stone, D., George, I. J., Mertes, S., van Pinxteren, D., Tilgner, A., Herrmann, H., Evans, M. J., & Heard, D. E. (2015). The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010 (Version publishedVersion). Version publishedVersion. München : European Geopyhsical Union. https://doi.org/https://doi.org/10.5194/acp-15-3289-2015
Whalley L K, Stone D, George I J, Mertes S, van Pinxteren D, Tilgner A, Herrmann H, Evans M J, Heard D E. The influence of clouds on radical concentrations: Observations and modelling studies of HOx during the Hill Cap Cloud Thuringia (HCCT) campaign in 2010. Published online 2015. doi:https://doi.org/10.5194/acp-15-3289-2015


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