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

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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.