Cloud Condensation Nuclei in the Small Cumulus Microphysical Study

哈德逊/摘要 两架研究飞机将与CP-2双波长雷达协调，将飞机引导到正在形成聚合的云层，并提供云层轮廓和液态水含量的时间历史。 从两架飞机上进行的详细云滴和水滴光谱测量将跟踪合并的发展。 两台带有校准设备的DRI瞬时CCN（云凝结核）光谱仪将安装在NCAR C-130上。 有时，这两个仪器将冗余地监测环境气溶胶，但在大多数时间，一个光谱仪将监测逆流虚拟撞击器（CVI），以确定云滴内的原子核光谱。 这将有助于确定卷吸对云滴谱的影响，并有助于区分均匀、非均匀和实体混合过程。 对比云凝结核谱和上升气流速度谱，将确定气溶胶对雾滴谱的影响。 这个基本的云形成实验与比较的模式预测的液滴光谱与观测的液滴光谱将产生一个更好的定义CCN-重要的临界过饱和度（Sc）。 液滴（50 μ m）和液滴（50 μ m）光谱的详细比较将确定每一个对另一个的影响。 这些测量可以在聚结之前和之后（在液滴存在之前和之后）按时间顺序进行的事实允许相对于液滴和液滴光谱分离因果关系。 聚结作用发生后，云凝结核的光谱将受到影响。 SCMS将产生按时间顺序跟踪的机会，以便在聚结清除发生之前和之后可以追踪气溶胶。

Hudson/Abstract Two research aircraft will be coordinated with the CP-2 dual wavelength radar, which will direct the aircraft to clouds with developing coalescence and will provide a time history of cloud outline and liquid water content. Detailed cloud droplet and drop spectra measurements from the two aircraft will trace the development of coalescence. The two DRI instantaneous CCN (cloud condensation nuclei) spectrometers with calibration equipment will be mounted on the NCAR C-130. At times these two instruments will redundantly monitor the ambient aerosol but for most of the time one spectrometer will monitor the counterflow virtual impactor (CVI) in order to determine the spectrum of nuclei within cloud droplets. This will help ascertain the effect of entrainment on the cloud droplet spectrum and will help differentiate homogeneous, inhomogeneous, and entity mixing processes. Comparisons of the CCN spectra and the spectra of updraft velocities will determine the influence of the aerosol on droplet spectra. This basic cloud forming experiment with comparisons of model predictions of droplet spectra with observations of droplet spectra will yield a better definition of CCN--the important critical supersaturations (Sc). Detailed comparisons of drop (50 Mm) and droplet (50 Mm) spectra will determine the influence of each on the other. The fact that these measurements can be made in time sequence before and after coalescence (before and after the existence of drops) allows cause and effect to be separated with respect to droplet and drop spectra. After coalescence has taken effect the CCN spectra will be affected. SCMS will yield the opportunity to follow in time sequence so that the aerosol can be traced before and after coalescence scavenging has occurred.