Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..995d&link_type=abstract
(International Association of Geomagnetism and Aeronomy and International Association of Meteorology and Atmospheric Physics, Un
Physics
72
Atmospheric Temperature, Infrared Radiation, Mesosphere, Radiant Cooling, Thermosphere, Carbon Dioxide, Dynamic Models, Molecular Energy Levels, Thermodynamic Equilibrium
Scientific paper
The current status of numerical techniques for the study of CO2 cooling in the mesosphere and lower thermosphere is discussed. It is shown that the most difficult region to simulate through calculations is the region from 70-90 km, where cooling rates are strongly influenced by absorption radiation from underlying layers. A three energy-level model is developed to simulate the excited population levels of a CO2 molecule and the results of the model calculations of cooling rates and nonlocal thermodynamic equilibrium (NLTE) are presented. Analysis of the calculations shows that global average infrared cooling rates appear to be in reasonable balance with solar heating rates. Radiative cooling rates due to CO2 above 100 km are strongly dependent on atomic oxygen concentrations, and on the rate of energy exchange between atomic oxygen and CO2. NO cooling was found to be proportional to atomic oxygen concentrations. The implications of the results for current theoretical models of atmospheric dynamics are discussed.
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