Greifswald 2024 – scientific programme

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UP: Fachverband Umweltphysik

UP 1: Atmospheric Trace Gases and Aerosols

UP 1.2: Talk

Monday, February 26, 2024, 11:30–11:45, ELP 6: HS 4

Improvements of the HAGAR-V instrument and its performance during the HALO mission PHILEAS — •Ronja van Luijt, Valentin Lauther, Johannes Strobel, Andrea Rau, Lars Zlotos, and Claus Michael Volk — Institute for Atmospheric and Environmental Research, University of Wuppertal, Germany

Precise airborne in situ measurements of VOCs are useful to understand atmospheric processes and can be achieved by GC/MS. The need for high spatial resolution conflicts with typical time resolutions of 3 to 10 minutes for mobile GC/MS. We present the recently improved HAGAR-V (High Altitude Gas AnalyzeR-5 channel version), developed at the University of Wuppertal for use on the HALO aircraft, with a time resolution of 2 minutes while measuring about 30 VOC species in the ppt range by employing two identical GC channels with a single MS. Additionally, it includes a NDIR CO2 analyzer and a 2-channel GC/ECD. For the GC/MS, innovative multitasking of various processes and strong sample refocusing result in detection limits of a few ppq and precisions of 1-5% and a shorter sampling time of 40 s, yielding a significant improvement in resolving fine-scale atmospheric structure. We show the performance of the HAGAR-V instrument during the HALO mission PHILEAS investigating the impact of the Asian summer monsoon on the extratropical UTLS. HAGAR-V GC/MS measured with high resolution species with anthropogenic Asian sources, species with biomass burning sources and very short-lived NMHCs, providing key information for understanding the evolution of convectively uplifted pollutants in the UTLS.

Keywords: GC/MS; VOC; Trace gases; UTLS; HALO