- 1Satellite Remote Sensing Group, Max Planck Institute for Chemistry, Mainz, Germany (b.lauster@mpic.de)
- 2Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
- 3Department of Chemistry and Biochemistry & Geophysical Institute, University of Alaska Fairbanks, AK, USA
Halogen chemistry is a central element of tropospheric ozone depletion events (ODEs) during polar spring. Key processes such as source mechanisms that produce reactive halogen species, their transport, and interhalogen interactions as well as the influence of the quickly changing climate, however, remain in the centre of Arctic research.
We deployed a Long-Path Differential Optical Absorption Spectroscopy (LP-DOAS) instrument in Utqiagvik (formerly Barrow), Alaska, in December 2023. First results from measurements performed between March and May 2024 show that this period exhibits active halogen chemistry with many episodes of enhanced bromine monoxide coinciding with strongly reduced ozone concentrations. Further, analysis results of chlorine monoxide are presented. Additional Multi-AXis (MAX-) DOAS observations have been conducted since the beginning of April 2024.
Comparison to data from the instrument’s previous deployment at the German research station Neumayer, Antarctica (Nasse, 2019), indicates differences in the prevailing atmospheric conditions and trace gas amounts between both hemispheres which will be discussed in detail.
How to cite: Lauster, B., Donner, S., Frieß, U., Platt, U., Reischmann, L., Simpson, W., Ziegler, S., and Wagner, T.: Long-path DOAS observations of halogen oxides at Utqiagvik, Alaska, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-4239, https://doi.org/10.5194/egusphere-egu25-4239, 2025.
