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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/acp-2018-1139
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1139
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Nov 2018

Research article | 06 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Large-eddy simulation of radiation fog with comprehensive two-moment bulk microphysics: Impact of different aerosol activation and condensation parameterizations

Johannes Schwenkel1 and Björn Maronga1,2 Johannes Schwenkel and Björn Maronga
  • 1Institute of Meteorology and Climatology, Leibniz Universität Hannover, Hannover, Germany
  • 2Geophysical Institute, University of Bergen, Bergen, Norway

Abstract. In this paper we study the influence of the cloud microphysical parameterization on large-eddy simulations of radiation fog. A deep fog case as observed at Cabauw (Netherlands) is investigated using high-resolution large-eddy simulations with different microphysics treatments for activation and diffusional growth. A comparison of the results indicates that the commonly applied assumption of saturation adjustment produces at maximum 6.9% higher liquid water paths compared to the explicit diffusional growth method but has no significant influence on the general life cycle of the fog layer. Differences are found to be the most pronounced at the top of the fog layer where the highest supersaturations occurs. Furthermore, the effect of different cloud droplet number concentrations is investigated by using a selection of common activation schemes. We find, in line with previous studies, a positive feedback between the cloud droplet number concentration and both the optical thickness and the strength of the fog layer. Furthermore, we perform an explicit analysis of the budgets of microphysical quantities in order to assess which processes have the largest spatial and temporal influence on the development of the fog layer.

Johannes Schwenkel and Björn Maronga
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Johannes Schwenkel and Björn Maronga
Johannes Schwenkel and Björn Maronga
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Latest update: 15 Nov 2018
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Short summary
In this paper we study the influence of the cloud microphysical treatments in high resolved numerical simulation models on radiation fog events, which are still unsatisfactory predicted in weather forecast. Our results showed, that the choice of which scheme is used can have a significant impact on the strength and life cycle of the fog.
In this paper we study the influence of the cloud microphysical treatments in high resolved...
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