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Discussion papers
https://doi.org/10.5194/acp-2018-1144
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1144
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Nov 2018

Research article | 02 Nov 2018

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

Statistics on clouds and their relation to thermodynamic conditions at Ny-Ålesund using ground-based sensor synergy

Tatiana Nomokonova1, Kerstin Ebell1, Ulrich Löhnert1, Marion Maturilli2, Christoph Ritter2, and Ewan O'Connor3 Tatiana Nomokonova et al.
  • 1Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany
  • 2Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
  • 3Finnish Meteorological Institute, Helsinki, Finland, and Meteorology Department, University of Reading, Reading, United Kingdom

Abstract. The French–German Arctic Research Base AWIPEV at Ny-Ålesund, Svalbard, is an unique station for monitoring cloud related processes in the Arctic. For the first time, data from a set of ground-based instruments at AWIPEV observatory are analyzed to characterize the vertical structure of clouds. For this study, a 14-month dataset from Cloudnet combining observations from a ceilometer, a 94GHz cloud radar and a microwave radiometer, is used. The total cloud occurrence of 81%, with 44.8% of multi-layer and 36% of single-layer clouds was found. Among single-layer clouds the occurrence of liquid, ice and mixed-phase clouds was 6.4%, 9% and 20.6%, respectively. It was found, that more than 90% of single-layer liquid and mixed-phase clouds have LWP values lower than 100 and 200gm2, respectively. Mean values of IWP for ice and mixed-phase clouds were found to be 273 and 164gm2, respectively. The different types of single-layer clouds are also related to in-cloud temperature and relative humidity under which they occur. Statistics based on observations are compared to the ICON model output. Distinct differences in liquid phase occurrence in observations and the model at different environmental temperatures leading to higher occurrence of pure ice clouds and lower occurrence of mixed-phase clouds in the model at temperatures between −20° and −5°C become evident. The analyzed dataset is useful for satellite validation and model evaluation.

Tatiana Nomokonova et al.
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Data sets

Homogenized radiosonde record at station Ny-Ålesund, Spitsbergen, 1993–2014 M. Maturilli and M. Kayser https://doi.org/10.1594/PANGAEA.845373

Homogenized radiosonde record at station Ny-Ålesund, Spitsbergen, 2015–2016 M. Maturilli and M. Kayser https://doi.org/10.1594/PANGAEA.875196

Tatiana Nomokonova et al.
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In this study, properties of clouds at the French–German Arctic Research station in Ny-Ålesund are related to in-cloud thermodynamic conditions. The used dataset was collected within the Arctic Amplification project with a set of active and passive remote instruments. The results are compared with a model output. A significant divergence in observations and modelling of single layer ice and mixed-phase clouds was found.
In this study, properties of clouds at the French–German Arctic Research station in Ny-Ålesund...
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