青藏高原云降水物理及其对能量收支和水分循环的影响

青藏高原云降水物理认识的不足已严重影响了天气模式对高原云物理过程等描述的客观性。本项目将基于前期已取得的成果，特别是探测数据基础，通过集成星载及地基多源探测数据和再分析资料，建立多时空尺度高原云参数、降水、潜热及大气参数的综合数据集；利用该综合数据集，研究高原天气系统演变过程云降水宏微观参数的时空变化，认知高原主要天气系统活动相应的云参数、降水类型及强度等时空变化特征；研究降水云团的垂直结构及潜热垂直结构和长短波辐射，认知云降水对高原地气辐射收支的作用；研究高原云参数、降水强度及水汽等大气参数之间关系，认知云降水效率及其对区域大气水分循环的影响程度；研究高原与非高原天气模式中云降水物理参数的差异，认知影响天气模式中高原云降水物理过程的关键参数，提高天气模式对高原云降水过程的模拟。本研究将从云雾物理学视角及大气热动力学视角，提升对青藏高原云降水物理过程及其对能量收支及水分循环的综合认知。

Till right now, the processes of cloud and precipitation physics in the Tibet Plateau is not truly understood. It seriously affects the objectivity of these processes described by weather model. Based on previous achievements, especially on the basis of detection data, this proposal will establish a comprehensive dataset in multiple temporal-spatial scales with integrating cloud parameters, precipitation, latent heat and atmospheric parameters in the Tibet Plateau in terms of multi-source detections from satellite platforms, ground bases and reanalysis datasets. Through the analysis on this comprehensive dataset, the spatial and temporal variations of macro and micro parameters of cloud and precipitation associated with synoptic system changes over the Tibetan Plateau are going to be investigated to perceive natures of cloud parameters, precipitation types and their intensity as well as the relationship among them. Through studies on vertical structure of precipitation and its latent heat together with radiation of longwave and shortwave, the earth-atmosphere radiation budget affected by cloud and precipitation is going to be understood. Moreover, through studies on relationship among cloud, precipitation and water vapor, the efficiency of cloud and precipitation and its influence on regional water cycle are going to be analyzed. Through numerical simulations and contrast tests by changing physical parameters related to cloud and precipitation, by changing places over the Plateau or Non-Plateau in weather model, the key parameters related to cloud and precipitation processes impacted on simulations of weather model is going to be identified, which will be helpful to improve simulations of weather model. From the perspective of cloud physics and atmospheric thermal dynamics, the results of this proposal will enhance our comprehensive cognition on the physical process of cloud and precipitation, energy budget and water cycle over the Tibet Plateau.