Measurement of OVOCs, NMHCs, and Halocarbons Aboard the NSF-GV Aircraft during CONTRAST (CONvective TRansport of Active Species in the Tropics)

在该项目中，将利用NCAR GV飞机上的HAIS TOGA-GV仪器对挥发性有机化合物进行定量测量，作为拟于2014年1月和2月在关岛进行的热带活跃物种对流输送实验的一部分。CORST的目的是测量化学和运输的活性化学物质进入热带对流层顶过渡层（TTL）在西太平洋暖池区。TOGA-GV测量包括一套挥发性有机化合物C-2（VOC），包括：含氧化合物、非甲烷烃、卤代烃和一些含氮和硫的物质。在北半球冬季，痕量气体及其降解产物的来源、化学性质和向该区域平流层下部的输送可对平流层下部的化学性质产生重大影响。在这一活动中测量的痕量气体浓度可以影响大气化学和气候，并将提供一种化学描述输送的空气质量的方法。将获得以下方面的具体数据：海洋排放和人为及生物活动的示踪剂、自由基前体、城市和生物量燃烧排放的示踪剂、氧化处理的产物、气溶胶形成的前体以及对气溶胶改变和转化重要的化合物。更好地了解这一地区的过程，将改善面向过程的化学/气候模型及其验证，提供一套独特的基准测量，特别是在活性卤素化学的特性。

In this project, quantitative measurements of volatile organic compounds (VOC) utilizing the HAIS TOGA-GV instrument on the NCAR GV aircraft will be obtained as part of the Convective Transport of Active Species in the Tropics (CONTRAST) experiment proposed to take place during January and February 2014 from the island of Guam. CONTRAST is designed to measure the chemistry and transport of reactive chemical species into the tropical Tropopause Transition Layer (TTL) over the Western Pacific warm pool area. TOGA-GV measurements include a suite of volatile organic compounds C-2 (VOCs), including: oxygenates, non-methane hydrocarbons, halocarbons, and some nitrogen and sulfur containing species. The sources, chemistry, and transport of trace gases and their degradation products into the lower stratosphere in this region during the boreal winter season can substantially impact the chemistry of the lower stratosphere. The trace gas concentrations measured in this campaign can influence atmospheric chemistry and climate and will provide a method of chemically describing transported air masses. Specific data will be obtained for: tracers of oceanic emissions and anthropogenic and biogenic activities, radical precursors, tracers of urban and biomass combustion emissions, products of oxidative processing, precursors to aerosol formation, and compounds important for aerosol modification and transformation. Better understanding of the processes in this region will improve process-oriented chemistry/climate models and their validation by providing a unique suite of benchmark measurements, especially in the characterization of active halogen chemistry.