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PREMIER is one of three candidates for ESA's 7th Earth Explorer mission that  are currently undergoing feasibility studies. The main mission objective of  PREMIER 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 with a 2-D detector  array 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). The horizontal across track resolution  corresponds to the horizontal across track sampling of 25 km. Since the  achievable along track horizontal resolution is about 70 km, the dynamics  mode will provide GW limb-observations with a horizontal resolution comparable  to nadir sounders. Compared to previous observations, PREMIER will therefore  considerably extend the range of detectable GWs in terms of horizontal and  vertical wavelength

Tomographic retrieval approach for mesoscale gravity wave observations by the PREMIER Infrared Limb-Sounder