New Estimates of Greenhouse Cooling in the Upper Atmosphere

Details New Estimates of Greenhouse Cooling in the Upper Atmosphere New Estimates of Greenhouse Cooling in the Upper Atmosphere

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa51a..04a&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA51A-04

Physics

0342 Middle Atmosphere: Energy Deposition, 0358 Thermosphere: Energy Deposition, 1610 Atmosphere (0315, 0325)

Scientific paper

Our understanding of the various mechanisms of long-term cooling in the mesosphere and lower thermosphere (MLT) and of their relative contributions is evolving as new data on relevant physical processes, atmospheric composition, and on the atmospheric response become available. For example, such an important parameter as the collisional excitation rate of CO2 molecules by atomic oxygen has recently been reevaluated downward according to laboratory measurements. Estimates of atmospheric cooling over the recent decades will be revisited using, in particular, new CRISTA data on the MLT CO2 densities and compared to forcings from middle-atmospheric composition changes such as the ozone depletion and water vapor increases. Possible implications for the overall energy balance in the MLT will also be briefly discussed.

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