Statistics on clouds and their relation to thermodynamic conditions at Ny-Ålesund using ground-based sensor synergy
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Published:2019-04-02
Issue:6
Volume:19
Page:4105-4126
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Nomokonova Tatiana, Ebell KerstinORCID, Löhnert UlrichORCID, Maturilli MarionORCID, Ritter Christoph, O'Connor EwanORCID
Abstract
Abstract. The French–German Arctic research base AWIPEV (the Alfred Wegener Institute
Helmholtz Centre for Polar and Marine Research – AWI – and the French Polar
Institute Paul Emile Victor – PEV) at Ny-Ålesund, Svalbard, is a unique
station for monitoring cloud-related processes in the Arctic. For the first
time, data from a set of ground-based instruments at the 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
94 GHz cloud radar, and a microwave radiometer is used. A total cloud
occurrence of ∼81 %, with 44.8 % multilayer and 36 %
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 liquid water path (LWP) values lower than 100 and
200 g m−2, respectively. Mean values of ice water path (IWP) for ice
and mixed-phase clouds were found to be 273 and 164 g m−2,
respectively. The different types of single-layer clouds are also related to
in-cloud temperature and the relative humidity under which they occur. Statistics
based on observations are compared to ICOsahedral Non-hydrostatic (ICON)
model output. Distinct differences in liquid-phase occurrence in observations
and the model at different environmental temperatures lead to higher
occurrence of pure ice clouds. A lower occurrence of mixed-phase clouds in
the model at temperatures between −20 and −5 ∘C becomes evident.
The analyzed dataset is useful for satellite validation and model evaluation.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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