Up- and downdrafts and Drop and Ice Nucleation Experiment (UDINE): Lidar observations and modeling of tropical and mid-latitude altocumulus

上升和下降气流以及水滴和冰成核实验 (UDINE)：热带和中纬度高积云的激光雷达观测和建模

• 批准号: 162311106
• 负责人: Privatdozent Dr. Albert Ansmann
• 金额: --
• 依托单位: Leibniz-Institut für Troposphärenforschung e.V. (TROPOS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/162311106?language=en
• 关键词: Up; downdrafts; Drop; Ice; Nucleation

Based on field observations with two advanced aerosol–cloud lidars and a wind Doppler lidar and atmospheric modeling, heterogeneous ice formation in tropical and mid–latitude altocumulus will be studied. The focus is on the characterization of vertical movements (updrafts, downdrafts, waves) in altocumulus layers and the influence of up–and downdrafts on the formation of liquid water drops and ice crystals in stratiform, mid–level tropospheric clouds. The investigations comprise: (a) Long term lidar observations of cloud evolutions at the mid–latitude EARLINET station Leipzig (UDINE 2010–2011), (b) analysis of the SAMUM–2 altocumulus data set (about 400 layers) measured at Cape Verde in the winter and summer of 2008, (c) comprehensive statistical analysis of the observed altocumulus vertical velocity fields and contrasting the findings for tropical and mid–latitude cloud layers, and (d) simulation of altocumulus evolutions (case studies) as observed with lidar. Such an approach is unique and is an important contribution to an improved understanding of the formation of ice and precipitation in atmospheric clouds.

基于两个先进的气溶胶-云激光雷达和一个风多普勒激光雷达的实地观测和大气模拟，将研究热带和中纬度高积云的非均匀冰形成。重点是在高积云层的垂直运动（上升气流，下降气流，波）的特性和上升和下降气流对层状，中层对流层云的液态水滴和冰晶的形成的影响。调查包括：（a）在中纬度莱比锡EARLINET站对云的演变进行长期激光雷达观测（UDINE 2010-2011年），（B）SAMUM-2高积云数据集分析2008年冬季和夏季在佛得角测量的约400层，（c）对观测到的高积云垂直速度场进行综合统计分析，并将热带和中热带地区的结果进行对比，纬度云层，以及（d）用激光雷达观测的高积云演变模拟（个案研究）。这种方法是独一无二的，是对更好地了解大气云中冰和降水的形成的重要贡献。