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

我们在此申请资金，以便在TACTS/SALSA、POLSTRACC、SHIVA(扩展)和Cirrus-RS任务期间在Halo上操作新开发的示踪仪Ghost-MS。这些飞行任务的科学目标范围从热带对流层上层的化学到输运研究。Ghost-MS是在合并项目FACT的Halo优先方案第一阶段期间开发的一种原位气色谱(GC)。Ghost-MS有三个通道：两个测量长寿命痕量气体(N2O和SF6/CFC-12)的ECD(电子捕获检测器)通道和一个可以测量大量卤代烃的MS(质谱仪)通道。这些物种用作化学和动力学示踪剂，用于研究对流层顶区的卤素收支和对流层上层(UT)和平流层最低层(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，任务是测量跨越各种大气寿命的示踪剂，而对于化学预算研究，重要的是测量相关的来源气体，例如整个溴族。这里提出的工作包括Ghost-MS的最后认证、宣传活动的准备、实地作业、数据检索和利用数据进行的第一次科学研究。

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.