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Infrared limb sounding from aircraft can provide 2-D curtains  of multiple trace gas species. However, conventional limb sounders  view perpendicular to the aircraft axis and are unable to resolve the  observed airmass along their line-of-sight. GLORIA (Gimballed Limb  Observer for Radiance Imaging of the Atmosphere) is a new remote  sensing instrument that is able to adjust its horizontal view angle with  respect to the aircraft flight direction from 45° to  135°. This will allow for tomographic measurements of  mesoscale structures for a wide variety of atmospheric constituents. <br><br>  Many flights of the GLORIA instrument will not follow closed curves that  allow measuring an airmass from all directions. Consequently, it is  examined by means of simulations, what spatial resolution can be expected  under ideal conditions from tomographic evaluation of measurements made  during a straight flight. It is demonstrated that the achievable  horizontal resolution in the line-of-sight direction could be reduced from  over 200 km to around 70 km compared to conventional retrievals and that  the tomographic retrieval is also more robust against horizontal gradients  in retrieved quantities in this direction. In a second step, it is shown  that the incorporation of channels exhibiting different optical depth can  further enhance the spatial resolution of 3-D retrievals enabling the  exploitation of spectral samples usually not used for limb sounding due to  their opacity. <br><br>  A second problem for tomographic retrievals is that advection, which  can be neglected for conventional retrievals, plays an important role  for the time-scales involved in a tomographic measurement flight. This  paper presents a method to diagnose the effect of a time-varying  atmosphere on a 3-D retrieval and demonstrates an effective way  to compensate for effects of advection by incorporating wind-fields  from meteorological datasets as a priori information

A 3-D tomographic retrieval approach with advection compensation for the air-borne limb-imager GLORIA