Giant Cloud Condensation Nuclei (CCN) Impactor Data. Version 1.0

The NCAR/EOL/RAF Giant Cloud Condensation Nuclei Impactor (GNI) samples giant aerosol particles. This data set was acquired during the SOCRATES project. Slides were exposed in the free air stream onto uncoated polycarbonate microscope slides. The slides were analyzed in the NCAR/EOL/RAF GNI slide chamber, using a dual-optical microscope. Slides were inserted into the humidified chamber with a relative humidity of 89.8 %. The images were analyzed using an automated edge detection algorithm, and using spherical cap geometry to determine the solution drop volume. Subsequently, the equivalent dry NaCl equivalent radius was determined using the Kohler equation for concentrated solutions, specifically Pruppacher and Klett, 1978, eq. 6.26b, using a full chemical potential calculation.

NCAR/EOL/RAF巨型云凝结核撞击器（Giant Cloud Condensation Nuclei Impactor, GNI）用于采集巨型气溶胶颗粒样本。本数据集采集自SOCRATES项目执行期间。实验将未涂层聚碳酸酯显微镜载玻片置于自由气流中曝露，使气溶胶颗粒附着于载玻片表面。随后将载玻片放入NCAR/EOL/RAF GNI载玻片分析舱，采用双光路显微镜开展分析。将载玻片置入相对湿度为89.8%的加湿舱内后，通过自动边缘检测算法对采集到的图像进行分析，并借助球冠几何模型计算液滴溶液体积。后续基于浓溶液科勒方程（Kohler equation），采用完整化学势计算方法，参照普鲁帕彻与克莱特1978年发表的公式6.26b，计算得到等效干态氯化钠等效半径。