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

警务所设想的研究有助于目标一项目，利用雷达偏振法进行定量过程和模型评估。将利用树突生长层（DGL）及以下现有的和新的原位测量来评估关于DGL中增强的特定差相KDP起源的目标假设，并量化现有的多个指标，以区分聚集和边缘过程，以便仅基于极化气象雷达测量建立相应的区分算法。对kdp波段的解释和区分聚集和边缘的能力对于熔化层以上的数据同化和模式微物理至关重要。现场测量还用于评估最先进的颗粒数浓度Nt，平均颗粒直径Dm和冰水含量IWC的极化检索，并评估ICON-LAM中颗粒类型和尺寸分布的代表性。在希伯来大学云模型（HUCM）中使用先进的光谱bin微物理方案，结合测量的极化剖面，也将为ICON-LAM中潜在缺陷的过程提供见解，从而充分表示颗粒类型和分布。

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.