Using tracer observation with GhOST-MS during TACTS, SALSA, POLSTRACC and WISE to derive age spectra and the halogen budget of the UTLS during different seasons

我们建议在WISE任务期间在HALO上部署我们的气相色谱系统GhOST-MS（用于观察示踪剂的气相色谱仪-耦合质谱仪）。GhOST-MS将在平流层下层和最下层测量具有不同寿命的示踪剂（从接近无限的SF6到几周的CHBr3）。这些测量结果将与TACTS、SALSA和POLSTRACC运动的观测结果相结合。我们将集中讨论两个科学课题：瞬变时间分布（年龄谱）的推导和平流层下层和最下层卤素收支的推导。卤素预算的重点将放在溴上。对不同季节、不同气象条件进行评价。我们将开发一种新的方法来推导双峰年龄谱，从而更好地描述与下层和最下层平流层有关的过境时间分布。计划与Forschungszentrum j<s:1> lich和在那里进行的蛤蜊建模工作密切合作。Ehhalt等人（2007）开发的方法将作为我们新方法的基础。关于卤素预算，我们建议使用我们的测量方法，从平流层下层和最下层的短寿命源气体中得出无机溴和氯的数量，在那里它可以与臭氧发生反应。这些数据将与海德堡大学对无机卤素的准同步测量相结合，以得出一个完整的卤素，特别是溴的预算。

We propose to deploy our gaschromatographic system GhOST-MS (Gas chromatograph for the Observation of tracers - coupled with a mass spectrometer) on HALO during the WISE mission. GhOST-MS will measure tracers with different lifetimes (ranging from near infinite like SF6 to a few weeks (CHBr3)) in the lower and lowermost stratosphere. These measurements will be combined with observations from the TACTS, SALSA and POLSTRACC campaigns. We will focus on two scientific topics: the derivation of transit time distributions (age-spectra) and the derivation of a halogen budget of the lower and lowermost stratosphere. A focus of the halogen budget will be on bromine. The evaluation be performed for different seasons and for different meteorological situations. A new method will be developed to derive bimodal age spectra, which will lead to a better description of the transit time distributions relevant to the lower and lowermost stratosphere. A close collaboration with Forschungszentrum Jülich and the CLaMS modelling work performed there is planned. The method developed by Ehhalt et al. (2007) will be used as a basis for our new approach. With respect to the halogen budget we propose to use our measurements to derive the amount of inorganic bromine and chlorine from short-lived source gases in the lower and lowermost stratosphere, where it can react with ozone. These data will be combined with quasi-simultaneous measurements of inorganic halogen species by the University of Heidelberg, in order to derive a complete halogen, especially bromine budget.