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Titel: Seasonal variability of Saharan desert dust and ice nucleating particles over Europe
Autor(en): Hande, L.B.Engler, C.Hoose, C.Tegen, I.
Verlagsversion: https://doi.org/10.5194/acp-15-4389-2015
URI: https://doi.org/10.34657/1233
https://oa.tib.eu/renate/handle/123456789/326
Erscheinungsjahr: 2015
Publiziert in: Atmospheric Chemistry and Physics, Volume 15, Issue 8, Page 4389-4397
Verlag: München : European Geopyhsical Union
Abstract: Dust aerosols are thought to be the main contributor to atmospheric ice nucleation. While there are case studies supporting this, a climatological sense of the importance of dust to atmospheric ice nucleating particle (INP) concentrations and its seasonal variability over Europe is lacking. Here, we use a mesoscale model to estimate Saharan dust concentrations over Europe in 2008. There are large differences in median dust concentrations between seasons, with the highest concentrations and highest variability in the lower to mid-troposphere. Laboratory-based ice nucleation parameterisations are applied to these simulated dust number concentrations to calculate the potential INP resulting from immersion freezing and deposition nucleation on these dust particles. The potential INP concentrations increase exponentially with height due to decreasing temperatures in the lower and mid-troposphere. When the ice-activated fraction increases sufficiently, INP concentrations follow the dust particle concentrations. The potential INP profiles exhibit similarly large differences between seasons, with the highest concentrations in spring (median potential immersion INP concentrations nearly 105 m−3, median potential deposition INP concentrations at 120% relative humidity with respect to ice over 105 m−3), about an order of magnitude larger than those in summer. Using these results, a best-fit function is provided to estimate the potential INPs for use in limited-area models, which is representative of the normal background INP concentrations over Europe. A statistical evaluation of the results against field and laboratory measurements indicates that the INP concentrations are in close agreement with observations.
Schlagwörter: aerosol composition; aerosol formation; atmospheric deposition; concentration (composition); dust; mesoscale meteorology; nucleation; seasonal variation; troposphere
Publikationstyp: article; Text
Publikationsstatus: publishedVersion
DDC: 550
Lizenz: CC BY 3.0 Unported
Link zur Lizenz: https://creativecommons.org/licenses/by/3.0/
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Hande, L.B., C. Engler, C. Hoose and I. Tegen, 2015. Seasonal variability of Saharan desert dust and ice nucleating particles over Europe. 2015. München : European Geopyhsical Union
Hande, L. B., Engler, C., Hoose, C. and Tegen, I. (2015) “Seasonal variability of Saharan desert dust and ice nucleating particles over Europe.” München : European Geopyhsical Union. doi: https://doi.org/10.5194/acp-15-4389-2015.
Hande L B, Engler C, Hoose C, Tegen I. Seasonal variability of Saharan desert dust and ice nucleating particles over Europe. München : European Geopyhsical Union; 2015.
Hande, L. B., Engler, C., Hoose, C., & Tegen, I. (2015). Seasonal variability of Saharan desert dust and ice nucleating particles over Europe (Version publishedVersion). Version publishedVersion. München : European Geopyhsical Union. https://doi.org/https://doi.org/10.5194/acp-15-4389-2015
Hande L B, Engler C, Hoose C, Tegen I. Seasonal variability of Saharan desert dust and ice nucleating particles over Europe. Published online 2015. doi:https://doi.org/10.5194/acp-15-4389-2015


Diese Publikation wurde unter der folgenden Lizenz veröffentlicht: Creative-Commons-Lizenz Creative Commons