In situ tracer measurements and analysis with HAGAR-V during the HALO mission SOUTHTRAC in fall 2019

在该项目的框架内，我们建议i）在2019年秋季的HALO SOUTHTRAC使命期间使用新型HAGAR-V仪器对一套示踪剂进行原位测量，以及ii）分析所获得的HAGAR-V示踪剂数据以实现该使命的科学目标。HAGAR-V结合了NATIONAL分析仪的快速CO2测量，一种测量长寿命示踪剂的双通道GC/ECD系统（CH 4，F12，F11，F113，CCl 4，SF6，每90秒）和双通道GC/MS系统，每90-180秒靶向一套其他示踪剂物质，包括长寿命的（HFC-125、HFC-134 a、HFC-32）和短寿命物质（C2 H2、iso-C5 H12、CH 2Cl 2、CHCl 3、CH 3Cl、C2Cl 4）。因此，HAGAR-V涵盖了大多数主要的氯源气体以及最重要的氯化VSLS，还提供了生物质燃烧示踪剂（C2 H2和CHCl 3）、优秀的北方半海示踪剂（CH 2Cl 2、CHCl 3、C2Cl 4）和经典的平流层年龄示踪剂（SF6和CO2）。 这些物种在中纬度对流层顶的当地寿命从几天到多年不等。对HAGAR-V示踪剂数据的分析将有助于SOUTHTRAC的科学主题，解决与南半球输送和混合有关的一些飞行任务目标，以及南极涡旋和生物质燃烧对南部UTLS的影响。

In the frame of this project we propose i) in situ measurements of a suite of tracers with the novel HAGAR-V instrument during the HALO SOUTHTRAC mission in the fall of 2019, and ii) analysis of the obtained HAGAR-V tracer data toward the scientific goals of that mission. HAGAR-V combines a fast CO2 measurement by NDIR analyzer, a 2-channel GC/ECD-system measuring long-lived tracers (CH4, F12, F11, F113, CCl4, SF6 every 90 s) and a 2-channel GC/MS system targeting a suite of further tracer species every 90-180 s, including long-lived (HFC-125, HFC-134a, HFC-32) and short-lived species (C2H2, iso-&n-C5H12, CH2Cl2, CHCl3, CH3Cl, C2Cl4). HAGAR-V thus covers most major chlorine source gases as well as the most important chlorinated VSLS, and also provides biomass burning tracers (C2H2 und CHCl3), excellent northern hemishere tracers (CH2Cl2, CHCl3, C2Cl4) and the classical stratospheric age tracers (SF6 and CO2). Local lifetimes of these species at the midlatitude tropopause range from several days to many years. The analysis of the HAGAR-V tracer data will contribute to the scientific themes of SOUTHTRAC by addressing a number of the missions’ objectives related to southern hemispheric transport and mixing, and the impact excerted on the southern UTLS by the Antarctic vortex and by biomass burning.