EGU21-11674, updated on 04 Mar 2021
https://doi.org/10.5194/egusphere-egu21-11674
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Balloon-borne GLORIA hyperspectral Limb and Nadir imager in the LWIR

Erik Kretschmer1, Felix Friedl-Vallon1, Thomas Gulde1, Michael Höpfner1, Sören Johansson1, Anne Kleinert1, Guido Maucher1, Tom Neubert2, Hans Nordmeyer1, Christof Piesch1, Peter Preusse3, Martin Riese3, Georg Schardt2, Axel Schönfeld3, Jörn Ungermann3, and Gerald Wetzel1
Erik Kretschmer et al.
  • 1Institut für Meteorologie und Klimaforschung (IMK-ASF), Karlsruher Institut für Technologie, Karlsruhe, Germany
  • 2Zentralinstitut für Engineering, Elektronik und Analytik-Systeme der Elektronik (ZEA-2), Forschungszentrum Jülich Jülich, Germany
  • 3Institut für Energie und Klimaforschung – Stratosphäre (IEK-7), Forschungszentrum Jülich, Jülich, Germany

The GLORIA-B (Gimballed Limb Observer for Radiance Imaging of the Atmosphere - Balloon) instrument is an adaptation of the very successful GLORIA-AB imaging Fourier transform spectrometer (iFTS) flown on the research aircrafts HALO and M55 Geophysica. The high spectral resolution in the LWIR (Long Wave Infrared) allows for the retrieval of temperature and of a broad range of atmospheric trace gases, with the goal to retrieve O3, H2O, HNO3, C2H6, C2H2, HCOOH, CCl4, PAN, ClONO2, CFC-11, CFC-12, SF6, OCS, NH3, HCN, BrONO2, HO2NO2, N2O5 and NO2. The radiometric sensitivity of the Balloon instrument is further increased in comparison with the GLORIA-AB instrument by having two detector channels on the same focal plane array, while keeping the same concept of a cooled optical system. This system improvement was achieved with minimal adaptation of the existing optical system.

The high spatial and temporal resolution of the instrument is ensured by the imaging capability of the Fourier transform spectrometer while stabilizing the line-of-sight in elevation with the instrument and in azimuth with the balloon gondola. In a single measurement lasting 13 seconds, the atmosphere can be sounded from mid-troposphere up to flight altitude, typically 30 km, with a vertical resolution always better than 1 km for most retrieved species; a spatial resolution up to 0.3 km can be achieved in favourable conditions. Temperature retrieval precision between 0.1 and 0.2 K is expected. A spectral sampling up to 0.0625 cm-1 can be achieved.

The first flight of GLORIA-B shall take place during the late-summer polar jet turn-around at Kiruna/ESRANGE. This flight is organised in the frame of the HEMERA project and was scheduled for summer 2020, but was ultimately postponed to summer 2021. Beyond qualification of the first balloon-borne iFTS, the scientific goals of the flight are, among others, the quantification of the stratospheric bromine budget and its diurnal evolution by measuring vertical profiles of BrONO2 in combination with BrO observations by the DOAS instrument of University Heidelberg on the same platform.

How to cite: Kretschmer, E., Friedl-Vallon, F., Gulde, T., Höpfner, M., Johansson, S., Kleinert, A., Maucher, G., Neubert, T., Nordmeyer, H., Piesch, C., Preusse, P., Riese, M., Schardt, G., Schönfeld, A., Ungermann, J., and Wetzel, G.: Balloon-borne GLORIA hyperspectral Limb and Nadir imager in the LWIR, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11674, https://doi.org/10.5194/egusphere-egu21-11674, 2021.

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