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Discussion papers
https://doi.org/10.5194/acp-2019-599
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-599
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Jun 2019

Research article | 27 Jun 2019

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

Simulation of mixed-phase clouds with the ICON-LEM in the complex Arctic environment around Ny-Ålesund

Vera Schemann and Kerstin Ebell Vera Schemann and Kerstin Ebell
  • University of Cologne, Institute for Geophysics and Meteorology, Cologne, Germany

Abstract. Low-level mixed phase clouds have a substantial impact on the redistribution of radiative energy in the Arctic and are a potential driving factor for Arctic Amplification. To better understand the complex processes around mixed-phase clouds, a combination of long-term measurements and high-resolution modeling - which is able to resolve the relevant processes - is essential. In this study, we show the general feasibility of the new high-resolution model ICON-LEM to capture the general structure, type and timing of mixed-phase clouds at the Arctic site Ny-Ålesund and its potential and limitations for further detailed research. As a basic evaluation the model is confronted with data streams of single instruments including microwave radiometer and cloud radar, but also with value added products like the Cloudnet classification. The analysis is based on a 11-day long time period with selected periods being studied in more detail focusing on the representation of particular cloud processes, such as mixed-phase microphysics. In addition, targeted statistical evaluations against observational data sets are performed to assess i) how well the vertical structure of the clouds is represented and ii) how much information is added by higher resolutions. The results clearly demonstrate the advantage of high resolutions: in particular, with the highest model resolution of 75 m, the variability of liquid water path can be well captured. By comparing neighboring grid cells for different subdomains we also show the potential of the model to provide information on the representativity of single sites (as Ny-Ålesund) for a larger domain.

Vera Schemann and Kerstin Ebell
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Vera Schemann and Kerstin Ebell
Vera Schemann and Kerstin Ebell
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Latest update: 19 Jul 2019
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Short summary
In this study, we are applying a high-resolution model at the observational supersite Ny-Ålesund (Svalbard) to evaluate mixed-phase clouds. These clouds are a potential driver for the stronger warming in the Arctic compared to the global mean, but their representation in climate models is typically rather poor due to the complex microphysical processes. The presented combination of high-resolution modeling and longterm state-of-the-art observations can lead to an improved process understanding.
In this study, we are applying a high-resolution model at the observational supersite...
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