Predicted cloud droplet numbers Davos Wolfgang

Cloud droplet properties were predicted between February 24 and March 8 2019 for the measurement site Davos Wolfgang (1630 m a.s.l., LON: 9.853594, LAT: 46.835577). Droplet calculations are carried out with the physically based aerosol activation parameterization of Morales and Nenes (2014), employing the “characteristic velocity” approach of Morales and Nenes (2010). Aerosol size distribution observations required to predict the cloud droplet numbers and maximum in-cloud supersaturation are obtained from a Scanning Mobility Particle Size Spectrometer (SMPS) instrument deployed at Davos Wolfgang (https://www.envidat.ch/dataset/aerosol-data-davos-wolfgang). The required vertical velocity measurements are derived from the wind Doppler Lidar (https://www.envidat.ch/dataset/lidar-wind-profiler-data) deployed at the same station and are extracted from the first bin of the instrument, being 200 m above ground level. The hygroscopic properties of the particles measured at Davos Wolfgang could not be estimated, owing to a lack of concurrent CCN measurements. As a sensitivity test, droplet calculations are performed assuming two different values of the aerosol hygroscopicity parameter, 0.1 and 0.25, based on the analysis carried out for Weissfluhjoch. Additional information can be found in Section 2.3 [here](https://acp.copernicus.org/preprints/acp-2020-1036/).

本数据集针对2019年2月24日至3月8日期间达沃斯沃尔夫冈观测站点（海拔1630 m a.s.l.，经度9.853594，纬度46.835577）的云滴特性完成预测。云滴计算采用Morales与Nenes（2014）提出的基于物理过程的气溶胶活化参数化方案，并运用了Morales和Nenes（2010）的“特征速度”方法。预测云滴数与云内最大过饱和度所需的气溶胶粒径分布观测数据，来自部署于达沃斯沃尔夫冈站点的扫描迁移率粒径谱仪（Scanning Mobility Particle Size Spectrometer，SMPS），相关数据集可通过https://www.envidat.ch/dataset/aerosol-data-davos-wolfgang获取。所需的垂直速度测量数据，则由同一站点部署的多普勒风激光雷达（wind Doppler Lidar）获取，提取自该仪器距离地面200米高度的首个探测通道，相关数据集可通过https://www.envidat.ch/dataset/lidar-wind-profiler-data获取。由于缺乏同步的云凝结核（Cloud Condensation Nucleus，CCN）测量数据，无法直接估算达沃斯沃尔夫冈站点观测粒子的吸湿性特性。作为敏感性测试，本研究基于魏斯弗卢约赫（Weissfluhjoch）的分析结果，分别采用气溶胶吸湿性参数为0.1与0.25的两种假设开展云滴计算。更多详细信息可参见第2.3节[此处](https://acp.copernicus.org/preprints/acp-2020-1036/)。