balloon-borne solar occultation DOAS instrument: balloon-borne experiments, atmospheric compounds measurements, flight of 23 August 2022

This dataset contains the data presented in Voss et. al. (2024): https://egusphere.copernicus.org/preprints/2024/egusphere-2023-2912/.
The bromine monoxide was measured with the new balloon-borne solar occultation DOAS (Differential Optical Absorption Spectroscopy) instrument. This instrument is of medium weight (37 kg) and has a low power consumption (100 W), and thus, can easily be deployed as a secondary payload on remote sensing balloon payloads. The instrument consists of a spectrometer unit housing two temperature and pressure stabilized commercial Ocean Optics spectrometers (QE-Pro) and an automated sun tracker for direct sun observations from azimuth-controlled balloon platforms. It is designed to measure a suite of UV/vis absorbing gases relevant in the context of stratospheric ozone depletion using the DOAS method. This flight is involved in the HEMERA project.
The dataset includes the differential slant column densities of BrO (dSCDs) obtained during the sunset observed from balloon float altitude in reference to a spectrum recorded from balloon float altitude at a solar zenith angle of 74.1°. The regression of the dSCDs in conjunction with the calculated total air mass SCD_air in each line of sight provides a measure of total overhead BrO volume mixing ratios. The photochemically calculated partitioning of [BrO] relative to [Br_y] used to retrieve the total stratospheric bromine [Br_y] is used to weigh SCD_air. The regression of the dSCDs with this weighted SCD_(air_weigh) provides a measure of total inorganic overhead bromine [Br_y]. Additionally, the mean N2O profile measured by the GLORIA instrument during the deployment used to estimate the age of air is included in the dataset.