Abstract
<p>The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an aircraft-<br>based Fourier transform spectrometer with a 2D detector array jointly developed by Forschungszentrum<br>Jülich and Karlsruhe Institute of Technology. Air temperature and volume mixing ratios of various<br>trace gases are retrieved from the measured IR spectra. GLORIA's viewing direction can be panned between 45<sup>◦</sup> and 135<sup>◦</sup><br>w. r. t. the flight direction. Combining this capability with flight paths that encircle the observed<br>atmospheric region, multiple measurements of the same air mass can be performed, allowing for 3D<br>tomography of the atmosphere with a vertical resolution down to 250 m and horizontal resolution of<br>around 25 km.<br>GLORIA flew on the German HALO research aircraft during the SouthTRAC measurement cam-<br>paign held in southern Argentina in September-November 2019. One of the main goals of the campaign<br>was gravity wave study using GLORIA, as well as an upward looking ALIMA lidar instrument devel-<br>oped by Deutsches Zentrum für Luft- und Raumfahrt (DLR), and in situ instruments. During one of<br>the research flights, a large amplitude mountain wave was observed over the Andes. The air volume<br>near the mountains was encircled twice, providing a unique opportunity to study the time evolution<br>of an orographic gravity wave with a help of 3D time dependent temperature retrieval. We present<br>the initial analysis of this dataset, showing complex temperature structure with several overlapping<br>gravity wave families at altitudes of 9 to 14 km. GLORIA data is complemented by the ALIMA lidar<br>temperature retrieval at altitudes between about 20 and 60 km, providing insight into further upward<br>propagation and breaking of the observed mountain wave. We also compare our results with ECMWF model data.</p>
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