Measurement of the spectral extinction coefficient of atmospheric aerosols at ambient conditions and characterization of hygroscopic properties for different source regions (influenced by MARINE - DUST - SMOKE) with SÆMS, LIDAR und in-situ methods.

在该项目中，我们将测量未受影响的大气气溶胶在3个波长（405，532和850 nm）的光谱消光系数与新开发的便携式光谱气溶胶消光监测系统（光谱气溶胶消光监测系统）结合拉曼激光雷达系统。这一创新的遥感技术将在全世界选定的区域应用于某些气溶胶类型和天然气溶胶混合物。该系统将配备湿度和温度传感器，以研究在环境条件下大气光学特性的变化。这将根据各自的气溶胶条件针对优化的光学路径（水平路径长度1-3 km，10-20 m高度）进行。我们将估计每个站点的环境气溶胶的吸湿性，并将应用一个典型的气溶胶类型依赖的参数化。长期目标是确定气溶胶柱的特征（通过地面原位方法和遥感方法相结合），并系统调查相对湿度对气溶胶光学特性的影响。近地面消光系数的自动测量将在TROPOS的连续测量站LACROS（莱比锡气溶胶和云远程观测系统）中实现。这项研究对于气候建模（气溶胶辐射作用力的参数化）和主动遥感测量（估计大气柱的光学特性）与地面原位方法测量微物理特性的协同作用起着至关重要的作用。

Within the project we will measure the spectral extinction coefficient of the unaffected atmospheric aerosol at 3 wavelengths (405, 532, and 850 nm) with the newly developed portable SÆMS (Spectral Aerosol Extinction Monitoring System) in combination with a Raman lidar system. This innovative remote-sensing technique will be applied worldwide at selected regions for certain aerosol types and natural aerosol mixtures. The system will be equipped with humidity and temperature sensors to study the modification of the optical properties of the atmosphere at ambient conditions. This will be done for optimized optical paths (horizontal path length 1-3 km, 10-20 m height) in dependency on respective aerosol conditions. We will estimate the hygroscopic properties of the ambient aerosol for each site and will apply a typical aerosol-type dependent parameterization. The long-term goal is the characterization of the aerosol column (via combination of ground-based in-situ methods and remote-sensing methods) and a systematic investigation of the influence of the relative humidity on aerosol optical properties. The automated measurement of the extinction coefficient near the ground will be implemented in the continuous measurement station LACROS (Leipzig Aerosol and Cloud Remote Observations System) of TROPOS. This study plays a crucial role for climate modelling (parameterization of the radiative forcing of aerosols) and for the synergy of active remote sensing measurements (estimation of the optical properties of the atmospheric column) with measurements of microphysical properties with ground-based in-situ methods.