Investigations of multi-phase chemistry in levitated surrogate cloud droplets

悬浮代理云滴中多相化学的研究

• 批准号: 1213723
• 负责人: Timothy Bertram
• 金额: $ 41.6万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-15 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1213723&HistoricalAwards=false
• 关键词: Investigations; multi; phase; chemistry; levitated

The Environmental Chemical Sciences Program in the Chemistry Division at the National Science Foundation supports the research of Professor Frank N. Keutsch at the University of Wisconsin- Madison who proposes a novel experimental approach that will simulate cloud-processing of reactive hydrocarbons, which is an important pathway for the formation and transformation of ambient fine particulate matter (aerosol). Cloud processing influences aerosol concentrations and physicochemical properties, which in turn regulate aerosol optical and cloud-nucleating properties. Cloud processing thus represents a paradigm for chemistry-climate coupling. The proposed approach combines optical tweezers with a suite of analytical instrumentation to transcend existing experimental limitations, allowing exploration of the critical competition of gas/condensed phase exchange, chemical reactions and cloud droplet drying/growth cycles. The research will provide important mechanistic parameters of aerosol formation and properties, which are currently lacking in models of climate and air quality. The proposed work is ultimately designed to aid prediction of aerosol properties, thereby enhancing the mitigation of anthropogenic effects on human health, the environment and the climate. This project will also provide education of scientists and develop undergraduate laboratory experiments that consider not only individual processes, but also the coupled chemical/physical feedbacks, such as those between the gas and condensed phases. The work will also expand the scope of analytical experimental methodology available to other fields of research.

美国国家科学基金会化学部的环境化学科学项目支持弗兰克·N。Keutsch在威斯康星州-麦迪逊大学提出了一种新的实验方法，将模拟云处理的活性碳氢化合物，这是一个重要的途径，形成和转化的环境细颗粒物（气溶胶）。云过程影响气溶胶的浓度和物理化学性质，进而调节气溶胶的光学和云成核特性。因此，云处理代表了化学-气候耦合的范例。所提出的方法结合了光镊与一套分析仪器，以超越现有的实验限制，允许探索的关键竞争的气体/凝聚相交换，化学反应和云滴干燥/生长周期。这项研究将提供气溶胶形成和性质的重要机械参数，这是目前气候和空气质量模型所缺乏的。拟议的工作最终旨在帮助预测气溶胶特性，从而加强减轻人类健康、环境和气候的人为影响。该项目还将为科学家提供教育，并开发本科生实验室实验，不仅考虑单个过程，而且考虑耦合的化学/物理反馈，例如气相和凝聚相之间的反馈。这项工作还将扩大其他研究领域可用的分析实验方法的范围。