Airborne Measurements of Inorganic Acids during the Deep Convective Clouds and Chemistry (DC3) Experiment

深对流云和化学 (DC3) 实验期间无机酸的机载测量

• 批准号: 1063652
• 负责人: Lewis Huey
• 金额: $ 45.5万
• 依托单位: Georgia Tech Research Corporation
• 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: 2011-04-15 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1063652&HistoricalAwards=false
• 关键词: Airborne; Measurements; Inorganic; Acids; during

The Deep Convective Clouds and Chemistry (DC3) field campaign seeks to characterize the impact of convective systems on the chemistry and composition of the upper troposphere (UT). This project supports the deployment of a newly built chemical ionization mass spectrometer (CIMS) on the NSF/NCAR G-V aircraft to measure pernitric acid (HO2NO2), nitric acid (HNO3), hydrochloric acid (HCl), and sulfur dioxide (SO2). These observations will be interpreted to evaluate the impact of convection on UT photochemistry. HNO3 and HO2NO2 measured in and around convective outflow will provide valuable constraints on the chemical processes in these environments. The HO2NO2 observations will be particularly useful as the relatively short lifetime of this species makes it very sensitive to radical levels. Photochemical calculations will be performed to predict the observed HO2NO2 levels as well as the time evolution of the observed HNO3. This will allow a critical test of our understanding of processes that control radical levels and ozone production in the UT. Observations of SO2 will be used to assess the cloud processing of this species and serve as a useful comparison point with other aircraft involved in DC3. The HCl observations will serve as a tracer for stratospheric influence and provide a marker for lower altitude mid-continent chlorine chemistry. The information generated through this project will improve understanding of the impacts of convective storms on atmospheric chemistry. In addition, the CIMS instrument will become part of the facilities at NCAR and available for future investigators on the G-V. The project will support one Ph.D. student and form the core of his/her dissertation research. Two undergraduate students will gain valuable research experience through participation in the project. Finally, the PI will partner with a local Atlanta area high school to facilitate exposure of underrepresented minorities to higher education and scientific research.

深对流云和化学 (DC3) 实地活动旨在描述对流系统对对流层上层 (UT) 的化学和成分的影响。 该项目支持在 NSF/NCAR G-V 飞机上部署新建的化学电离质谱仪 (CIMS)，以测量过硝酸 (HO2NO2)、硝酸 (HNO3)、盐酸 (HCl) 和二氧化硫 (SO2)。 这些观察结果将被解释为评估对流对 UT 光化学的影响。 对流流出及其周围测量的 HNO3 和 HO2NO2 将为这些环境中的化学过程提供有价值的限制。 HO2NO2 观测结果特别有用，因为该物种相对较短的寿命使其对自由基水平非常敏感。 将进行光化学计算来预测观测到的 HO2NO2 水平以及观测到的 HNO3 的时间演变。 这将对我们对控制UT内自由基水平和臭氧产生的过程的理解进行严格的测试。对 SO2 的观测将用于评估该物种的云处理，并作为与 DC3 中涉及的其他飞机的有用比较点。 HCl 观测结果将作为平流层影响的示踪剂，并为低海拔中部大陆氯化学提供标记。通过该项目产生的信息将增进对对流风暴对大气化学影响的了解。 此外，CIMS 仪器将成为 NCAR 设施的一部分，可供未来 G-V 的调查人员使用。该项目将支持一名博士。学生并构成他/她论文研究的核心。 两名本科生将通过参与该项目获得宝贵的研究经验。 最后，PI 将与亚特兰大当地的一所高中合作，促进代表性不足的少数群体接受高等教育和科学研究。