Journal Article

FZJ-2025-04370

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Intercomparison and validation of first GLORIA-B measurements of stratospheric and upper tropospheric long-lived tracers and photochemically active species

Wetzel, G. (Corresponding author) ; Kleinert, A. ; Johansson, S. ; Friedl-Vallon, F. ; Höpfner, M. ; Ungermann, J.FZJ* ; Neubert, T.FZJ* ; Catoire, V. ; Crevoisier, C. ; Engel, A. ; Gulde, T. ; Jacquet, P. ; Kirner, O. ; Kretschmer, E. ; Kulessa, T.FZJ* ; Laube, J. C.FZJ* ; Maucher, G. ; Nordmeyer, H. ; Piesch, C. ; Preusse, P.FZJ* ; Retzlaff, M.FZJ* ; Schardt, G.FZJ* ; Schillings, J. ; Schneider, H.FZJ* ; Schönfeld, A. ; Schuck, T. ; Woiwode, W. ; Riese, M.FZJ* ; Braesicke, P.

2025
Copernicus Katlenburg-Lindau

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Please use a persistent id in citations: doi:10.5194/amt-18-5873-2025  doi:10.34734/FZJ-2025-04370

Abstract: Accurate observations of the vertical distribution and variability of atmospheric trace gases are essential for understanding chemical processes, validating atmospheric models, and monitoring the impact of anthropogenic emissions on climate and ozone. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is a limb-imaging Fourier-Transform Spectrometer (iFTS) designed to provide high-resolution mid-infrared spectra in the 780–1400 cm−1 wavenumber range. Originally developed for aircraft, the instrument has now been adapted for stratospheric balloon deployment (GLORIA-B) to extend its observational range from the middle troposphere to the middle stratosphere. GLORIA-B completed its first flight from Kiruna (Sweden) in August 2021 and a second from Timmins (Canada) in August 2022 as part of the EU Research Infrastructure HEMERA (Integrated access to balloon-borne platforms for innovative research and technology). The main objectives of these flights were technical qualification and the provision of a first imaging hyperspectral limb-emission dataset from 5 to 36 km altitude. Here, we present a characterization and validation of GLORIA-B performance using vertical volume mixing ratio (VMR) profiles retrieved from the August 2021 flight. Comparisons with in-situ measurements (ozonesonde, MegaAirCore, and cryosampler) show agreement within 10 % for O3, CH4, SF6, and CFC-12, and within 10 %–20 % for CFC-11, HCFC-22, and CFC-113 up to 18 km, with larger deviations above this altitude. Another objective is analyzing diurnal changes in photochemically active species (N2O5, NO2, ClONO2, BrONO2). Observed VMR variations align well with simulations from the EMAC (ECHAM5/MESSy Atmospheric Chemistry) chemistry-climate model, though absolute concentrations differ to a certain extent. Nighttime BrONO2 measurements allowed an estimate of lower stratospheric Bry (20.4 ± 2.5 pptv). These results demonstrate the suitability of balloon-borne limb-imaging spectroscopy for providing high-quality vertical trace gas profiles, offering valuable new data to improve our understanding of stratospheric composition and to support the validation of atmospheric models.

Keyword(s): Geosciences (2nd)

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Contributing Institute(s):

1. Stratosphäre (ICE-4)

Research Program(s):

1. 2112 - Climate Feedbacks (POF4-211) (POF4-211)
2. DFG project G:(GEPRIS)467086066 - Seasonalität, Variabilität und Trends von halogenisierten Spurengasen in der UTLS (C04) (467086066) (467086066)

Appears in the scientific report 2025

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