Atmospheric Measurement Techniques Discussions www.atmos-meas-tech-discuss.net 1867-8610 2 5 2009 10.5194/amtd-2-2809-2009 http://www.atmos-meas-tech-discuss.net/2/2809/2009/ http://www.atmos-meas-tech-discuss.net/2/2809/2009/amtd-2-2809-2009.html http://www.atmos-meas-tech-discuss.net/2/2809/2009/amtd-2-2809-2009.pdf 2809 2850 2009-10-30 Tomographic retrieval approach for mesoscale gravity wave observations by the PREMIER Infrared Limb-Sounder J. Ungermann j.ungermann@fz-juelich.de L. Hoffmann P. Preusse M. Kaufmann M. Riese Forschungszentrum Jülich, Institut für Chemie und Dynamik der Geosphäre (ICG-1), Jülich, Germany PREMIER is one of three candidates for ESA's 7th Earth Explorer mission that are currently undergoing feasibility studies. The main mission objective is to quantify processes controlling atmospheric composition in the mid/upper troposphere and lower stratosphere, a region of particular importance for climate change. To achieve this objective, PREMIER will employ the first satellite Fourier transform infrared limb-imager combined with a millimetre-wave limb-sounder. The infrared limb-imager can be operated in a high spatial resolution mode ("dynamics mode") for observations of small-scale structures in atmospheric temperatures and trace gas fields with unprecedented 3-D sampling (0.5 km in the vertical direction, 50 km along track, 25 km across track). In this paper, a fast tomographic retrieval scheme is presented, which is designed to fully exploit the high-resolution radiance observations of the dynamics mode. Based on a detailed analysis of the "observational filter", we show that the dynamics mode provides unique information on global distributions of gravity waves (GW). The achievable vertical resolution for GW observations has values between the vertical sampling (0.5 km) of the dynamics mode and the vertical field of view (about 0.75 km). 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