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

格陵兰峰会冰粒生长和清除过程的评估

• 批准号: 8922049
• 负责人: Randolph Borys
• 金额: $ 2.95万
• 依托单位: Nevada System of Higher Education, Desert Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8922049&HistoricalAwards=false
• 关键词: Assessment; Ice; Particle; Growth; Scavenging

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.

该项目将在格陵兰岛的GISP-II取心点观测云滴和雪晶复制品，以评估冰粒翻转对1990年夏季首脑会议场址的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，它在云内和云下表现为不同的形式，并且强烈依赖于云滴的分布谱，重点是冰滴与云滴之间的碰撞效率(边缘过程)，以及后续的清除效率和降雨率。被冰晶生长清除的大气气溶胶颗粒构成了保存在格陵兰冰盖中的化学记录的一部分，并在冰芯中的观测中形成了一个时间序列。这一记录历来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认为是大气组成的相应变化。认为存在一对一关系，甚至是线性关系的假设，目前还没有得到很好的确立。该项目将有助于为这些关系建立更坚实的基础。