Evolution of Aerosol Hygroscopicity, Mixing State, and Cloud Activation Efficiency

气溶胶吸湿性、混合状态和云激活效率的演变

• 批准号: 0514401
• 负责人: Don Collins
• 金额: $ 28.95万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0514401&HistoricalAwards=false
• 关键词: Evolution; Aerosol; Hygroscopicity; Mixing; State

This project will deploy and operate a suite of aerosol instruments at surface sites inside and downwind of Mexico City, and on board the NSF/NCAR C-130 aircraft, as part of the Megacity Impacts on Regional and Global Environments (MIRAGE) - Mexico City experiment and the Intercontinental and Megacity Pollution Experiment (IMPEX). The primary objective is to operate high-flow tandem differential mobility analyzers both at surface sites within and outside of Mexico City area as well as on board the aircraft to obtain measurements of size-resolved hygroscopicity and volatility. Submicron and supermicron aerosol size distributions will be measured at the surface sites using differential mobility analyzers and aerodynamic particle sizers. The tandem differential mobility analyzers operated at the main surface site northeast of Mexico City will be augmented to permit measurement of size-resolved aerosol hydration state. The concentration and properties of cloud condensation nuclei will be measured at the main site using a cloud condensation nuclei counter together with a recently developed cloud condensation nuclei separator. The collected data will be integrated to provide a comprehensive description of the size, hygroscopicity, volatility, and cloud nucleating efficiency of the aerosol as it evolves over a period of hours or days. The results of these measurements are expected to lead to an improved understanding of the impact of emissions from a major urban area on the downwind environment. Mexico and other countries will benefit from this knowledge, which may help guide decisions regarding environmental management. The project will also foster partnerships between researchers in the United States and Mexico.Two graduate students will gain field experience through this project. At least one student from Mexico City will be engaged to assist in the data collection and analysis.

该项目将在墨西哥城内和顺风的地面站点以及 NSF/NCAR C-130 飞机上部署和操作一套气溶胶仪器，作为特大城市对区域和全球环境影响 (MIRAGE) - 墨西哥城实验和洲际和特大城市污染实验 (IMPEX) 的一部分。主要目标是在墨西哥城地区内外的地面站点以及飞机上操作高流量串联差分迁移率分析仪，以获得尺寸分辨吸湿性和挥发性的测量结果。将使用微分迁移率分析仪和空气动力学粒度仪在表面位置测量亚微米和超微米气溶胶尺寸分布。在墨西哥城东北部主要地面站点运行的串联微分迁移率分析仪将得到增强，以允许测量尺寸分辨的气溶胶水合状态。云凝结核的浓度和性质将在主站使用云凝结核计数器和最近开发的云凝结核分离器进行测量。收集到的数据将被整合，以提供气溶胶在数小时或数天内演变过程中的大小、吸湿性、挥发性和云成核效率的全面描述。这些测量结果预计将有助于更好地了解主要城市地区的排放对顺风环境的影响。墨西哥和其他国家将从这些知识中受益，这可能有助于指导有关环境管理的决策。该项目还将促进美国和墨西哥研究人员之间的合作。两名研究生将通过该项目获得现场经验。至少一名来自墨西哥城的学生将参与协助数据收集和分析。