Articles | Volume 8, issue 6
Atmos. Meas. Tech., 8, 2509–2520, 2015

Special issue: Atmospheric limb imaging with GLORIA

Atmos. Meas. Tech., 8, 2509–2520, 2015

Research article 19 Jun 2015

Research article | 19 Jun 2015

Validation of first chemistry mode retrieval results from the new limb-imaging FTS GLORIA with correlative MIPAS-STR observations

W. Woiwode1, O. Sumińska-Ebersoldt1, H. Oelhaf1, M. Höpfner1, G. V. Belyaev2, A. Ebersoldt3, F. Friedl-Vallon1, J.-U. Grooß4, T. Gulde1, M. Kaufmann4, A. Kleinert1, M. Krämer4, E. Kretschmer1, T. Kulessa5, G. Maucher1, T. Neubert6, C. Piesch1, P. Preusse4, M. Riese4, H. Rongen6, C. Sartorius1, G. Schardt6, A. Schönfeld4, D. Schuettemeyer7, M. K. Sha1, F. Stroh4, J. Ungermann4, C. M. Volk8, and J. Orphal1 W. Woiwode et al.
  • 1Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 2Myasishchev Design Bureau, Zhukovsky-5, Moscow Region, Russia
  • 3Institute for Data Processing and Electronics, Karlsruhe Institute of Technology, Karlsruhe, Germany
  • 4Institute of Energy and Climate Research – Stratosphere (IEK-7), Forschungszentrum Jülich, Jülich, Germany
  • 5Central Institute for Engineering, Electronics and Analytics – Engineering and Technology (ZEA-1), Forschungszentrum Jülich, Jülich, Germany
  • 6Central Institute for Engineering, Electronics and Analytics – Electronic Systems (ZEA-2), Forschungszentrum Jülich, Jülich, Germany
  • 7European Space Agency, Mission Science Division, Noordwijk, the Netherlands
  • 8Department of Physics, University of Wuppertal, Wuppertal, Germany

Abstract. We report first chemistry mode retrieval results from the new airborne limb-imaging infrared FTS (Fourier transform spectrometer) GLORIA (Gimballed Limb Observer for Radiance Imaging of the Atmosphere) and comparisons with observations by the conventional airborne limb-scanning infrared FTS MIPAS-STR (Michelson Interferometer for Passive Atmospheric Sounding – STRatospheric aircraft). For GLORIA, the flights aboard the high-altitude research aircraft M55 Geophysica during the ESSenCe campaign (ESa Sounder Campaign 2011) were the very first in field deployment after several years of development. The simultaneous observations of GLORIA and MIPAS-STR during the flight on 16 December 2011 inside the polar vortex and under conditions of optically partially transparent polar stratospheric clouds (PSCs) provided us the first opportunity to compare the observations by two different infrared FTS generations directly. We validate the GLORIA results with MIPAS-STR based on the lower vertical resolution of MIPAS-STR and compare the vertical resolutions of the instruments derived from their averaging kernels. The retrieval results of temperature, HNO3, O3, H2O, CFC-11 and CFC-12 show reasonable agreement of GLORIA with MIPAS-STR and collocated in situ observations. For the horizontally binned hyperspectral limb images, the GLORIA sampling outnumbered the horizontal cross-track sampling of MIPAS-STR by up to 1 order of magnitude. Depending on the target parameter, typical vertical resolutions of 0.5 to 2.0 km were obtained for GLORIA and are typically a factor of 2 to 4 better compared to MIPAS-STR. While the improvement of the performance, characterization and data processing of GLORIA are the subject of ongoing work, the presented first results already demonstrate the considerable gain in sampling and vertical resolution achieved with GLORIA.