Hygroscopic Growth of Accumulation Mode Particles Measured with HALO (HyGroPart)

0.1 ~ 10 μm的大气气溶胶部分对气候的直接和间接辐射强迫有贡献。在这种情况下，两个重要的颗粒特性是它们的吸湿性（在改变相对湿度下的生长行为）和它们的混合状态（化学成分在颗粒之间的分布）。为了改进大气模式和验证遥感仪器，需要对自由对流层中的这些颗粒特性进行现场测量。在本项目中，我们提出了在HALO SPP第一阶段开发的微米气溶胶入口（MAI）和Tandem光学粒子计数器（TOPC）在两个HALO演示任务（acmacon和NARVAL）中的应用。TOPC下游MAI将测量堆积模式颗粒的粒径和吸湿性生长。这些测量有助于量化气溶胶的直接强迫，了解颗粒的老化，并确定颗粒的混合状态。在ac讥on期间，重点是研究深层对流云对气溶胶粒子的影响。特别是在NARVAL期间，将研究粒子的老化与远距离传输以及粒子对信风云的影响。

Atmospheric aerosol partials in the size range 0.1 to 10 μm contribute to direct and indirect radiative forcing of climate. Two important particle properties in this context are their hygroscopicity (growth behavior at changing relative humidity) and their mixing state (distribution of chemical components among the particles). In situ measurements of these particles properties in the free troposphere are needed in order to improve atmospheric models and for validating remote sensing instruments. In this project, we propose the application of the Micrometer Aerosol Inlet (MAI) and the Tandem Optical Particles Counter (TOPC), developed in phase 1 of the HALO SPP, during two HALO demo missions (ACRIDICON and NARVAL). The TOPC downstream MAI will measure the particle size and the hygroscopic growth of accumulation mode particles. These measurements can help to quantify the direct aerosol forcing, to understand particle aging, and to determine the particle mixing state. During ACRIDICON the focus is on the influence deep convective clouds have on aerosol particles. During NARVAL in particular particle aging with long-range transport and the influence of particles on trade wind clouds shall be investigated.