Aerosol and vertical-velocity profiling and cloud glaciation observations during COPS

COPS 期间的气溶胶和垂直速度剖面以及云冰川观测

• 批准号: 71759142
• 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: Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/71759142?language=en
• 关键词: Aerosol; vertical; velocity; profiling; cloud

After carrying out multiwavelength aerosol lidar and Doppler lidar measurements during three months of COPS, we begin the data analysis with the optical and microphysical characterization of the aerosols observed in the boundary layer and the free troposphere. Focus of our work is the retrieval of microphysical properties (e.g., particle number concentration, volume concentration) from six–wavelength aerosol lidar observations, and the analysis of vertical–velocity fields in the upper convective boundary layer (in updrafts and downdrafts, diurnal cycle, case studies) from Doppler lidar observations. These products are of outmost interest for modelling groups. A statistical analysis of the vertical–velocity data in the boundary layer and in the free troposphere (in aerosol layers, altocumulus and mixed–phase clouds, cirrus) will be performed, too. We will further focus on the poorly understood process of heterogeneous ice formation (cloud glaciation) in mid tropospheric altocumulus (embedded in the Saharan dust or forest fire smoke layers that we detected during COPS). We will analyze these cases with respect to the occurrence of ice layers as a function of cloud top temperature and aerosol type (smoke or dust).

在COPS的三个月期间进行了多波长气溶胶激光雷达和多普勒激光雷达测量后，我们开始数据分析与边界层和自由对流层中观测到的气溶胶的光学和微物理特性。我们工作的重点是检索微物理性质（例如，粒子数浓度、体积浓度），以及多普勒激光雷达观测对对流边界层上部垂直速度场的分析（上升气流和下降气流、日周期、个例研究）。这些产品是模特团体最感兴趣的。还将对边界层和自由对流层（气溶胶层、高积云和混合相云、卷云）的垂直速度数据进行统计分析。我们将进一步关注对流层中部高积云（嵌入在我们在COPS期间检测到的撒哈拉沙漠灰尘或森林火灾烟雾层中）中异质冰形成（云冰川化）的知之甚少的过程。我们将分析这些情况下，冰层的发生作为云顶温度和气溶胶类型（烟雾或灰尘）的函数。