The Distribution of Carbon Monoxide in the Upper Mesosphere and Lower Thermosphere During CRISTA-1 and CRISTA-2

Details The Distribution of Carbon Monoxide in the Upper Mesosphere and Lower Thermosphere During CRISTA-1 and CRISTA-2 The Distribution of Carbon Monoxide in the Upper Mesosphere and Lower Thermosphere During CRISTA-1 and CRISTA-2

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa51c..06g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA51C-06

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0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3332 Mesospheric Dynamics, 3360 Remote Sensing, 3389 Tides And Planetary Waves

Scientific paper

Carbon monoxide concentrations are derived from the CRyogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) measurements in November 1994 and in August 1997. CRISTA is a helium cooled infrared limb sounder. Its measurements include daytime spectra of the CO (ν=1) band at 4.7 μm. From the spectra CO densities are derived using a state of the art non-LTE model. During the first mission data were recorded between 58°S and about 68°N. In the second mission the latitude coverage was extended to ±72° in the mesosphere. The orbital characteristics, however, were such that daytime conditions prevailed in the northern (summer) hemisphere only. The derived CO concentrations agree well with other experimental data. As the CO mixing ratio increases steeply with altitude in the mesosphere this gas is an excellent tracer for dynamics. Consequently the CO distribution is found extremely variable both in time and in space. The variations are compatible with the large-scale transport from the summer to the winter hemisphere. The influence of planetary waves is observed under winter as well as under summer conditions. Large tidal amplitudes were found at mid-latitudes during the second CRISTA mission. The overall wave activity observed in August by CRISTA suggests wave damping below 95 km and free wave propagation above.

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