A review of the scientific results from the CRISTA missions

Details A review of the scientific results from the CRISTA missions A review of the scientific results from the CRISTA missions

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004adspr..34.1715g&link_type=abstract

Advances in Space Research, Volume 34, Issue 8, p. 1715-1721.

Physics

1

Crista Missions, Atmospheric Limb Infrared Emission, Mesospheric Trace Gases And Temperatures

Scientific paper

The CRyogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA) experiment measured atmospheric limb infrared emissions in the altitude regime from the upper troposphere to the lower thermosphere during two Shuttle missions in November 1994 and August 1997. From the recorded spectra trace gas densities and temperature fields were derived on a very dense spatial grid. In the mesosphere and lower thermosphere trace gas and temperature retrievals were carried out with the help of a state of the art non-LTE (non-local thermodynamic equilibrium) model coupled to a line-by-line radiative transfer code. The upper atmosphere data include densities of carbon dioxide, ozone, atomic oxygen, and temperature. All parameters were derived for day and night with the exception of CO2 which is available for daytime only. Additional trace gases in the mesosphere include water vapor, methane, and carbon monoxide. The main findings are a substantial depletion of CO2 between 80 and 100 km, high ozone concentrations in the secondary maximum (upper mesosphere) during night, a tertiary ozone maximum near the winter polar terminator in the middle mesosphere and well developed dynamically induced structures in latitude as well as in longitude. Such structures are also observed in the lower thermosphere where the distribution of atomic oxygen was measured up to about 180 km altitude. The atomic oxygen concentrations encountered in the thermosphere during solar minimum are much lower than predicted by MSIS.

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