Influence of aerosol composition on cloud formation: in-situ studies by mass spectrometric measurements onboard HALO

当前大气科学的许多课题，特别是与气候研究有关的课题，都与气溶胶和云粒子的化学成分密切相关。例如，气溶胶粒子与云之间的相互作用，以及混合相云和卷云的辐射和微物理特性。对于基于飞机的气溶胶和云粒子的化学成分测量，高度时间分辨的技术是必不可少的，因为气溶胶粒子的空间变化可能很大，特别是在云附近。在德国科学界，这种技术还没有用于飞机。因此，我们在SPP HALO （SCHN 1138/1-1）的第一阶段开发了一种新的基于飞机的单粒子气溶胶质谱仪（ALABAMA），并对第二种现有仪器（C-ToF-AMS）进行了改造，以供飞机使用。这两种仪器在2008年和2009年成功地在不同的研究飞机上运行，并提供了关于火山气溶胶、北极污染羽流和城市特大城市排放的重要数据。在SPP即将到来的资助期内，我们计划在HALO任务ML-CIRRUS、ac滑稽on和NARVAL期间运行新仪器，重点研究卷云残留成分、气溶胶化学和气溶胶-云相互作用。

Many current topics in atmospheric science, especially those related to climate research, are closely connected to the chemical composition of aerosol and cloud particles. Examples are, amongst others, the interactions between aerosol particles and clouds, as well as the radiative and microphysical properties of mixed phase and cirrus clouds. For aircraft based chemical composition measurements of aerosol and cloud particles, a highly time-resolved technique is essential since the spatial variations of aerosol particles can be large, especially in the vicinity of clouds. Such a technique has not been available for aircraft use in the German science community. Therefore, we developed in the first phase of the SPP HALO (SCHN 1138/1-1) a new aircraft based single particle aerosol mass spectrometer (ALABAMA) and adapted a second, existing instrument (C-ToF-AMS) for aircraft use. Both instruments have been successfully operated on different research aircraft in 2008 and 2009 and delivered important data on volcanic aerosol, Arctic pollution plumes and urban megacity emissions. In the upcoming funding period of the SPP, we plan to operate the new instruments during the HALO missions ML-CIRRUS, ACRIDICON, and NARVAL, with emphasis on cirrus cloud residual composition, aerosol chemistry and aerosol-cloud interactions.