Numerical modeling of the contrail-to-cirrus transition considering the synoptic evolution and the formation of contrail clusters in areas of high air traffic

老化尾迹（也称为尾迹-卷云）很难与自然卷云区分开来，这使得原位方法和遥感观测非常困难甚至不可能。因此，云分辨模型是详细研究尾迹卷云演变和确定其几何、光学和微物理特性的合适工具。该项目旨在了解尾迹团的形成及其与自然卷云的相互作用。本提案的主要目标可以概括为以下5个项目：1：统计分析冰过饱和度的时间演变；2：调查尾迹团和自然卷云的竞争；3：量化飞机对尾迹卷云特性的影响；4：评估聚集的重要性；5：为全球气候模型、简化分析模型或羽流模型中的尾迹参数化提供基准模型

Aged contrails (also termed contrail-cirrus) can be hardly discriminated from natural cirrus which makes observations by in-situ methods and remote sensing very difficult or even impossible.Thus, cloud-resolving modeling is an appropriate tool to study the evolution of contrail-cirrus in detail and determine their geometric, optical and microphysical properties.This project aims at understanding the formation of contrail-clusters and their interaction with natural cirrus.The main objectives of this proposal can be summarized by the following 5 items:O1: Statistically analyze the temporal evolution of ice supersaturationO2: Investigate the competition of contrail-clusters and natural cirrusO3: Quantify the aircraft impact on contrail-cirrus propertiesO4: Assess the importance of aggregationO5: Provide a benchmark model for contrail parameterizations in global climate model, simplified analytical or plume models