Ammonia in the Remote Troposphere through Participation in the Southern Hemisphere Marine Aerosol Characterization Experiment (ACE-1)

9420175布拉德肖这项研究将侧重于通过在1995年南半球海洋气溶胶特性试验期间对国家科学基金会/NCARC C-130型飞机上的气相NH_3、“总”NH_3(即气态加颗粒)和一氧化氮(NO)的定量测量，来表征氨(NH_3)对遥远海洋大气中对流层化学的影响。这项工作将寻求解决NH3的S在ACE1计划的主要目标中的作用，该目标是确定控制气溶胶形成和去向的关键物理和化学过程，以及这些过程如何影响这些颗粒的数量尺寸分布、化学成分以及光学和云核特性。对于预计在ACE-1研究区域内的几个万亿分之几的NH3水平，佐治亚理工学院先进的光碎裂激光诱导荧光(PF/LIF)传感器将用于获取具有足够空间分辨率的高精度(10%，2s)数据，以便能够详细描述被认为导致凝聚核(CN)产生爆发的小空间尺度大气不均匀。这些史无前例的测量能力将产生新的数据，能够对NH3的S在控制CN的发展和云凝聚核(CCN)的增长和激活中所起的作用产生新的见解。结合ACE-1的其他测量，该项目应该提供一个独特的视角，了解二元和三元成核过程对控制偏远大气中新粒子产生速度的相对贡献。这项调查还将向大气界提供有关偏远海洋环境对流层内NH3空间分布的必要信息。这一大尺度的空间调查也将为首次定量评估NH3‘S在遥远的对流层中作为氮氧化物(N0x)的可能来源提供了基础。

9420175 Bradshaw This research will focus on characterizing ammonia's (NH3) impact on the tropospheric chemistry within the remote marine atmosphere through the quantitative measurement of gas phase NH3, "total" NH3 (i.e. gaseous plus particulate), and nitric oxide (NO) on board the NSF/NCAR C-130 aircraft during the 1995 Southern Hemisphere Marine Aerosol Characterization Experiment (ACE-1). This effort will seek to address NH3's role within the primary ACE-1 program objective of determining the key physical and chemical processes controlling the formation and fate of aerosols and how these processes affect the number size distribution, the chemical composition, and the optical and cloud nucleating properties of these particles. For a few parts-per-trillion levels of NH3 that are anticipated over the ACE- 1 study regions, the Georgia Tech advanced photofragmentation laser-induced fluorescence (PF/LIF) sensor will be used to acquire high precision ( 10%, 2s) data with sufficient spatial resolution to enable a detailed characterization of the small spatial scale atmospheric inhomogeneities that are thought to give rise to bursts in condensation nuclei (CN) production. These unprecedented measurement capabilities will produce data capable of yielding new insights into NH3's role in controlling the development of CN and the growth and activation of cloud condensation nuclei (CCN). In conjunction with other ACE-1 measurements, this project should provide a unique perspective of the relative contributions that binary and ternary nucleation processes make toward controlling the rate of new particle production in the remote atmosphere. This investigation will also provide the atmospheric community with needed information of the spatial distribution of NH3 within the troposphere over remote marine environments. This large spatial scale survey will also provide the basis for the first quantitative assessment of NH3's role as possible source of nitrogen oxides (N0x) i n the remote troposphere.