In this work, results from combined lidar and radar ground-based observations made at three sites (the Cabauw (Netherlands), Chilbolton (UK) and the ARM-SGP (USA) site) are presented. The European sites used in this work were part of the EU-5 CLOUDNET program [http://www.met.rdg.ac.uk/radar/cloudnet/]. Profiles of ice cloud effective particle size, extinction and ice water content (IWC) for a long time series at each site have been derived. The lidar/radar results have formed a basis for a new ice cloud effective particle size parameterization based on the cloud physical thickness. This parameterization has been tested using surface radiation measurements compared with radiative transfer calculations employing the new parameterization. Further the impact of the new parameteization in a regional climate model has been investigated.
In this paper we will briefly outline the lidar/radar method used in the study as well as discuss the new parameterization and its evaluation.
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