Climate model PArameterizations informed by RAdar (PARA)

雷达 (PARA) 提供的气候模型参数化

• 批准号: 408026929
• 负责人: Professor Dr. Johannes Quaas
• 金额: --
• 依托单位: Institut für Meteorologie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/408026929?language=en
• 关键词: Climate; model; PArameterizations; informed; RAdar

PARA contributes to the 2nd objective of SPP PROM by improving cloud and precipitation schemes in atmospheric models via the exploitation of polarimetry. An adequate representation of moist diabatic processes in clouds and precipitation in climate models is challenging, because these spatially unresolved processes are subject to sub-grid parameterizations, which must be informed by observations and/or models resolving these processes. Radar polarimetry provides most suitable observations on cloud and precipitation microphysics via microphysical retrievals and process fingerprints. PARA will focus in Phase I of PROM on ice water content heterogeneityand precipitation generation via the ice phase and concentrate on mixed-phase processes including riming and the role of particle number concentration variability in Phase II. PARA will investigate four processes both by polarimetric radar retrievals and the evaluation and revision of their representation in the ICON general circulation model (Fig. 1): (i) ice generation and spatial heteorogeneity of ice water content at ICON-GCM sub-grid scales, (ii) the role of both in snow formation like aggregation, (iii) melting of snow falling through the 0°C isotherm, and (iv) evaporation of rain below the melting layer.

PARA通过利用偏振测量改进大气模式中的云和降水方案，为SPP PROM的第二个目标作出贡献。对于云中的湿非绝热过程和气候模式中的降水的适当表示是具有挑战性的，因为这些在空间上未分辨的过程受子网格参数化的影响，而次网格参数化必须由解析这些过程的观测和(或)模式来提供信息。雷达偏振通过微物理反演和处理指纹提供了对云和降水微物理的最合适的观测。PARA将在PROM的第一阶段侧重于冰水含量的不均匀和通过冰相产生降水，并集中于混合相过程，包括结冰和第二阶段粒子数浓度变率的作用。PARA将通过极化雷达反演及其在ICON大气环流模式(图1)中的表示的评估和修订来研究四个过程：(1)ICON-GCM次网格尺度上冰的产生和冰水含量的空间异质性，(2)两者在积雪形成中的作用，如聚集，(3)通过0°C等温线落下的雪的融化，以及(4)融化层以下的雨水蒸发。