GhOST-MS: Gaschromatograph for Observation of Stratospheric Tracers - Mass Spectrometer

我们在此申请资金用于在TACTS/SALSA， POLSTRACC， SHIVA（扩展）和CIRRUS-RS任务期间在HALO上运行新开发的示踪仪器GhOST-MS。这些任务的科学目标范围从热带对流层上层的化学到运输研究。GhOST-MS是一种原位气相色谱仪（GC），是在FACT联合项目HALO优先计划的第一阶段开发的。GhOST-MS有三个通道：两个ECD（电子捕获检测器）通道测量长寿命的微量气体（N2O和SF6/CFC-12）和一个MS（质谱仪）通道，可以测量大量卤化碳。这些物种可以作为化学和动力学示踪剂来研究对流层顶区域的卤素收支以及对流层上层（UT）和最下层平流层（LMS）之间的气团交换。根据科学问题，GhOST-MS可以灵活地调整到特定的化合物。对于运输研究，任务是测量跨越大范围大气寿命的示踪剂，而对于化学预算研究，重要的是测量相关的源气体，例如完整的溴族。这里提出的工作包括GhOST-MS的最终认证、活动准备、实地行动、数据检索和数据的首次科学研究。

We apply here for funds to operate the newly developed tracer instrument GhOST-MS on HALO during the TACTS/SALSA, POLSTRACC, SHIVA (extension) and CIRRUS-RS missions. The scientific objectives of these missions range from chemistry in the upper tropical troposphere to transport studies. GhOST-MS is an in-situ Gaschromatograh (GC) which was developed during phase I of the HALO priority programme in the combined project FACT. GhOST-MS has three channels: two ECD (electron capture detector) channels measuring long-lived trace gases (N2O and SF6/CFC-12) and one MS (mass spectrometer) channel which can measure a large suite of halocarbons. These species serve as chemical and dynamical tracers to investigate the halogen budgets of the tropopause region and the exchange of air masses between the upper troposphere (UT) and the lowermost stratosphere LMS). Depending on the scientific questions, GhOST-MS can be flexibly tuned to specific compounds. For transport studies the task is the measurements of tracers spanning a wide range of atmospheric lifetimes, while for chemical budget studies it is important to measure the relevant source gases e.g. the complete bromine family. The work proposed here includes the final certification of GhOST-MS, the preparation for the campaigns, the field operations, the data retrieval and the first scientific studies with the data.