CAREER: Exploring the Physical and Chemical Properties of Light-Absorbing Aerosol: A Single Particle Approach

职业：探索光吸收气溶胶的物理和化学性质：单粒子方法

• 批准号: 2144005
• 负责人: James Davies
• 金额: $ 67.94万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-06-01 至 2027-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2144005&HistoricalAwards=false
• 关键词: CAREER; Exploring; Physical; Chemical; Properties

This CAREER project is focused on the study of the physical and chemical properties of light-absorbing organic aerosol particles in the atmosphere, especially those containing brown carbon (BrC). Fundamental laboratory studies using single particle levitation will be performed to characterize these properties to better understand and predict the role of BrC aerosol in the environment. This research is expected to lead to an improved description of atmospheric BrC aerosol and their role in clouds, climate, air quality and health.This effort will characterize the physical state, optical properties, and chemical evolution of model aqueous BrC aerosol to better understand their evolving impacts in the atmosphere. The goals of the proposal are to: (1) Identify the contributions of specific chromophores to the physical state of BrC particles; (2) Characterize the complex refractive index of BrC species in atmospherically relevant proxy particles; and (3) Explore the photochemical aging of BrC particles. A linear quadrupole electrodynamic balance (LQ-EDB) will be used to levitate micrometer-sized particle samples containing BrC constituents in a controlled environment to mimic atmospheric conditions. New and established tools will be applied to precisely probe the size, refractive index, phase morphology, and composition of suspended samples. The physical state and optical properties of the samples will be measured as a function of relative humidity and their response to photolysis and heterogeneous oxidation will be explored.A partnership is planned with local resident doctors at Riverside Community Hospital to provide an opportunity to teach the science and health impacts of air quality to populations of students in the local Riverside area.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该职业项目的重点是研究大气中吸光有机气溶胶颗粒的物理和化学性质，特别是那些含有棕碳（BrC）的气溶胶颗粒。将使用单粒子悬浮进行基础实验室研究来表征这些特性，以更好地理解和预测 BrC 气溶胶在环境中的作用。这项研究预计将改进对大气 BrC 气溶胶及其在云、气候、空气质量和健康中的作用的描述。这项工作将描述模型水 BrC 气溶胶的物理状态、光学特性和化学演化，以更好地了解它们在大气中不断变化的影响。该提案的目标是：（1）确定特定发色团对 BrC 颗粒物理状态的贡献； (2) 表征大气相关代理粒子中 BrC 物质的复折射率； (3)探索BrC颗粒的光化学老化。线性四极电动天平 (LQ-EDB) 将用于在受控环境中悬浮含有 BrC 成分的微米大小的颗粒样品，以模拟大气条件。新的和已建立的工具将用于精确探测悬浮样品的尺寸、折射率、相形态和成分。将测量样品的物理状态和光学特性作为相对湿度的函数，并探索它们对光解和异质氧化的反应。计划与河滨社区医院的当地住院医生建立合作伙伴关系，为当地河滨地区的学生提供一个机会，向学生传授空气质量对科学和健康的影响。该奖项反映了 NSF 的法定使命，并通过使用评估结果被认为值得支持。 基金会的智力价值和更广泛的影响审查标准。