Collaborative Research: Airborne Hydrogen Peroxide and Methylhydroperoxide Measurements during the Deep Convective Clouds and Chemistry (DC3) Experiment

合作研究：深对流云和化学 (DC3) 实验期间空气中过氧化氢和甲基氢过氧化物的测量

• 批准号: 1063463
• 负责人: Brian Heikes
• 金额: $ 24.65万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-04-01 至 2016-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1063463&HistoricalAwards=false
• 关键词: Collaborative; Research; Airborne; Hydrogen; Peroxide

Measurements of hydrogen peroxide and methylhydroperoxide will be made using a new chemical ionization mass spectrometry (CIMS) instrument on board the NSF/NCAR Gulfstream V research aircraft during the Deep Convective Clouds and Chemistry (DC3) field campaign in May-June 2012. Measurements of the two peroxides will be made at 10 Hz allowing horizontal and vertical sample resolution on the order of 20 meters and 2 meters, respectively. Through-the-inlet isotopically-labeled standard gas additions will be made continuously to provide coincident calibration for both species under all encountered variations in pressure, temperature, water vapor and other environmental variables. Extensive pre-mission, integration, test fight, and deployment evaluations and comparisons will be made using a ground-based wet-chemical calibration system.The DC3 airborne peroxide observations will provide: 1) distributions of these species in and around isolated deep convective clouds, 2) constraining data on odd-hydrogen chemistry in the upper troposphere and lower stratosphere, 3) constraining data on vertical transport of odd-hydrogen precursors by deep mid-latitude continental clouds, 4) constraining data on the scavenging of soluble species by cloud droplets and hydrometeors, 5) a probe of convected air-mass chemical aging in the upper troposphere with and without lightning-added nitrogen oxides, and 6) characterization of the variance of topics 1-5 across cloud-storm properties such as cloud base temperature, vertical velocity, freezing level and glaciation, and lightning. Results will be significant to tropospheric oxidant and ozone chemistry and their regional-to-global distributions; to heterogeneous gas-aerosol chemistry under cold, low specific humidity, and mixed sunlight conditions; to aerosol chemical evolution and their regional-to-global distributions; and ultimately to air quality and climate. The instrument system is novel and represents a significant advance in airborne peroxide instrumentation. One post-doctoral fellow, one graduate student and one or more undergraduate students will participate in the experiment. Data will be archived at the National Center for Atmospheric Research and results published in peer-reviewed journals.

在 2012 年 5 月至 6 月的深对流云和化学 (DC3) 现场活动期间，将使用 NSF/NCAR Gulfstream V 研究飞机上的新型化学电离质谱 (CIMS) 仪器对过氧化氢和甲基氢过氧化物进行测量。这两种过氧化物的测量将以 10 Hz 进行，水平和垂直样品分辨率约为 20 米和 2 米，分别。将通过入口连续添加同位素标记的标准气体，以便在压力、温度、水蒸气和其他环境变量的所有变化下为两种物质提供一致的校准。将使用地面湿化学校准系统进行广泛的任务前、集成、测试战斗和部署评估和比较。DC3机载过氧化物观测将提供：1）这些物种在孤立的深对流云中和周围的分布，2）对流层上部和平流层下部奇数氢化学的限制数据，3）关于奇数氢前体垂直传输的限制数据 通过深中纬度大陆云，4）关于云滴和水凝物清除可溶性物质的约束数据，5）在有或没有闪电添加的氮氧化物的情况下对对流层上层对流气团化学老化的探测，以及6）主题1-5跨云暴特性（例如云底温度、垂直速度、冻结水平和冰川作用）的方差特征， 和闪电。结果对于对流层氧化剂和臭氧化学及其区域到全球的分布具有重要意义；寒冷、低比湿度和混合阳光条件下的非均质气体-气溶胶化学；气溶胶化学演化及其区域到全球的分布；最终影响空气质量和气候。该仪器系统很新颖，代表了空气过氧化物仪器的重大进步。一名博士后、一名研究生和一名或多名本科生将参加实验。数据将存档在国家大气研究中心，结果将在同行评审的期刊上发表。