Measurements of ozone-depleting substances at the Cape Verde Observatory

该项目将扩大我们在佛得角天文台（CVO）的大气卤化碳GC-MS测量，以包括更广泛的现有和新出现的臭氧消耗物质。该学生还将在佛得角收集新的空气和海水VSLS氯测量数据，以调查和参数化现场海洋生产。学生将测试和协调柱组合与其他小组使用的柱组合，以比较新的卤代烃物种的相对保留时间，通过相互比较计划为以前未在CVO测量的化合物建立校准尺度，并建立每月海水采样CVO上风的CH 2Cl 2，CHCl 3和其他主要是天然的，同时分析海水中的CFC-11浓度将允许计算过量的CH 2Cl 2和CHCl 3“饱和异常”，这是评估是否正在发生原地海洋生产所必需的。将对这些饱和度异常进行分析，以确定与叶绿素A、有色溶解有机物和溶解有机碳丰度等相关的模式和趋势，以便扩大向热带海洋的排放。因此，该项目将确定新出现的人为臭氧消耗物质的模式和趋势，并更好地限制《蒙特利尔议定书》未予管制的短寿命臭氧消耗化合物的自然排放。

This project will expand our atmospheric halocarbon GC-MS measurements at the Cape Verde Observatory (CVO) to include a wider range of established and emerging ozone depleting substances. The student will also collect new air and seawater VSLS chlorine measurements at Cape Verde to investigate and parametrise in situ ocean production. The student will test and harmonise column combinations with those used by other groups to allow comparison of relative retention times for new halocarbon species, establish calibration scales for compounds not previously measured at CVO via an intercomparison programme, and establish a program of monthly seawater sampling upwind of the CVO for measurements of CH2Cl2, CHCl3 and other, predominantly natural, VSLS by purge and trap GC-MS. Simultaneous analysis of CFC-11 concentrations in seawater will allow calculation of the excess CH2Cl2 and CHCl3 "saturation anomalies", required to assess whether in-situ oceanic production is occurring. These saturation anomalies will be analysed for patterns and trends that correlate with, for example, chlorophyl-A, coloured dissolved organic material and dissolved organic carbon abundances, to allow scale-up of these emissions to the tropical ocean. Thus, the project will determine patterns and trends in emerging anthropogenic ozone depleting substances and better constrain natural emissions of short-lived ozone depleting compounds not controlled under the Montreal Protocol.