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Seasonal variability of Saharan desert dust and ice nucleating particles over Europe

Hande, L. B. 1; Engler, C.; Hoose, C. ORCID iD icon 1; Tegen, I.
1 Karlsruher Institut für Technologie (KIT)


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. ... mehr

Volltext §
DOI: 10.5445/IR/1000048395
DOI: 10.5194/acp-15-4389-2015
Zitationen: 41
Web of Science
Zitationen: 38
Zitationen: 48
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7316
KITopen-ID: 1000048395
HGF-Programm 12.03.03 (POF III, LK 01) Gas to particle conversion
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 15
Heft 8
Seiten 4389-4397
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Dimensions
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