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


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Marion.Maturilli [ at ] awi.de

Abstract

The French–German Arctic research base AW-IPEV (the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research – AWI – and the French Polar Institute Paul Emile Victor – IPEV) 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 themodel 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



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Article
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ISI/Scopus peer-reviewed
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Published
Eprint ID
49391
DOI 10.5194/acp-19-4105-2019

Cite as
Nomokonova, T. , Ebell, K. , Löhnert, U. , Maturilli, M. , Ritter, C. and O'Connor, E. (2019): Statistics on clouds and their relation to thermodynamic conditions at Ny-Ålesund using ground-based sensor synergy , Atmospheric Chemistry and Physics, 19 , pp. 4105-4126 . doi: 10.5194/acp-19-4105-2019


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