TITLE:
  Global and seasonal variations in middle atmosphere CO from 
  UARS/ISAMS.

AUTHORS:
  Lopez-Valverde, M.A., M. Lopez-Puertas, C. J. Marks and F. W. Taylor

REFERENCE:
  Geophys. Res. Lett., 20, 1247-1250, 1993

ABSTRACT:

  Carbon monoxide limb emissions at 4.6-mu measured by the Improved
Stratospheric And Mesospheric Sounder (ISAMS) on board the Upper Atmosphere
Research Satellite (UARS) are presented. The main features observed in the
radiance measurements are presented and discussed. These radiances are used
to obtain the CO abundances in the middle atmosphere, using a special
retrieval scheme which incorporates the non-LTE nature of the CO emission at
4.6-mu. The first global maps of the CO abundance in the middle
atmosphere illustrating its latitudinal/seasonal variations are presented
and briefly discussed. One of the most interesting results obtained is the
increase in the CO relative abundance in the mesosphere towards the
winter polar region, in accordance with previous predictions by 2D
dynamical-chemical models of the middle atmosphere.