Polarimetric signatures of ice microphysical processes and their interpretation using in-situ observations and cloud modeling (POLICE)

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Research envisioned in POLICE contributes to objective one project, the exploitation of radar polarimetry for quantitative process and model evaluation. Existing and novel in-situ measurements in the dendritic growth layer (DGL) and below will be exploited to evaluate targeted hypotheses on the origin of enhanced specific differential phase KDP in the DGL and quantify existing multiple indicators for the discrimination between aggregation and riming processes to enable the set-up of an according discrimination algorithm based on polarimetric weather radar measurements only. Both the explanation of KDP-bands and the ability to distinguish between aggregation and riming is crucial for data assimilation and model microphysics above the melting layer. In-situ measurements are also used to evaluate state-of-the art polarimetric retrievals of particle number concentration Nt, mean particle diameter Dm and ice water content IWC and to evaluate the representation of particle type and size distribution in ICON-LAM. The use of advanced spectral bin microphysical schemes in the Hebrew University Cloud Model (HUCM) in combination with measured polarimetric profiles will also give insights in processes responsible for potential deficiencies in ICON-LAM leading to an adequate representation of particle type and distribution.