Equipment for investigating the reactivity and physicochemical properties of model atmospheric organic-coated aerosols

研究模型大气有机涂层气溶胶的反应性和理化性质的设备

• 批准号: 345075-2007
• 负责人: AlAbadleh, Hind
• 金额: $ 3.3万
• 依托单位: Wilfrid Laurier University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=325950
• 关键词: Equipment; investigating; reactivity; physicochemical; properties

The lower atmosphere comprises a large concentration of minute particles known as atmospheric aerosols. Aerosols contribute to climate change as they modify the amount of sunlight reaching the Earth's surface, alter formation and lifetime of clouds, and also provide media for chemical reactions in the atmosphere.  There is a great need to better understand aerosols' impact on the climate system on a molecular level.  Atmospheric scientists address scientific questions related to aerosols through experimental studies that demand the use of model aerosol systems and analytical techniques that operate under atmospherically-representative conditions. The processing and aging of aerosol particles in the atmosphere occur as a result of their reactions with atmospheric oxidants.  Such processing alters the physical and chemical properties of aerosols.  The funding requested in this Tools grant will be used to acquire equipment for characterizing model aerosol particles and studying their surface reactions with ozone and nitrogen oxides. The equipment consists of a surface area analyzer, an accessory for diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), and a pumping system for the gas handling assembly. The presence of this system in my laboratory at Laurier will expand the capabilities of the atmospheric chemistry research program, and will offer students hands-on-experience using a number of instruments. Results obtained from these studies will increase our understanding of the aging process of aerosols and their overall impact on the global climate.

低层大气中含有大量被称为大气气溶胶的微小颗粒。气溶胶会改变到达地球表面的阳光量，改变云的形成和寿命，气溶胶也是大气中化学反应的媒介。我们非常需要在分子水平上更好地了解气溶胶对气候系统的影响。大气科学家通过实验研究来解决与气溶胶有关的科学问题，这些实验研究需要使用模型。气溶胶系统和分析技术，在大气代表性条件下运行。气溶胶粒子在大气中的加工和老化是由于它们与大气氧化剂反应的结果。这种加工改变了气溶胶的物理和化学性质。本工具赠款中申请的资金将用于购买表征模型气溶胶粒子的设备，并研究它们与臭氧和氮氧化物的表面反应。该设备由表面积分析仪、漫反射傅里叶变换红外光谱（DRIFTS）附件和气体处理组件的泵送系统组成。该系统在我的实验室在劳里埃的存在将扩大大气化学研究计划的能力，并将为学生提供使用一些仪器的实践经验。从这些研究中获得的结果将增加我们对气溶胶老化过程及其对全球气候的总体影响的理解。