Assessment of Ice Particle Growth and Scavenging Processes at Summit, Greenland

该项目将在格陵兰的全球地理信息系统- ii取心点观测云滴和雪晶复制品，以便评估1990年夏季在首脑会议地点冰粒边缘对化学湿沉积和气溶胶清除的重要性。气溶胶清除是一个复杂的过程，它在云中和云中以不同的形式存在，并且在很大程度上取决于云滴的分布谱，主要取决于冰粒和云滴之间的碰撞效率（形成雾的过程）。以及随后的清除效率和沉淀率。被冰晶生长清除的大气气溶胶颗粒构成了格陵兰冰盖中保存的化学记录的一部分，并在冰芯的观测中形成了一个时间序列。历史上，这一记录被解释为沉积时大气成分的代表，而沿岩心的颗粒含量的变化被解释为大气成分的相应变化。一对一关系存在的假设，甚至是线性的假设，目前还没有很好地建立起来。这个项目将有助于为这些关系建立更牢固的基础。

This project will make observations of cloud droplets and snow crystal replicas at the GISP-II coring site in Greenland in order to assess the importance of ice particle riming on chemical wet deposition and aerosol scavenging at the Summit site during the summer of 1990. Aerosol scavenging is a complex process which takes different forms within clouds and below coulds, and also depends strongly on the cloud droplet distribution spectrum, focusses on the collision efficiencies between ice particles and cloud droplets (the riming process), and the subsquent scavenging efficiencies and precipitation rates. Atmospheric aerosol particles scavenged by ice crystal growth form a part of the chemical record preserved in the Greenland ice sheet, and form a time series in the observations in an ice core. This record has historically been interpreted as a representation of the composition of the atmosphere at the time of deposition, and a variation of the particle content along the core has been interpeted as a corresponding variation in the composition of the atmosphere. The assumption that a one-to-one relationship exists, or even that it is linear, is not well established at this time. This project will help establish a firmer basis for these relationships.