On the closeness of the middle atmosphere to the state of radiative equilibrium: An estimation of net dynamical heating

Physics

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Atmospheric Heating, Middle Atmosphere, Radiative Heat Transfer, Temperature Distribution, Thermodynamic Equilibrium, Approximation, Atmospheric Heat Budget, Atmospheric Temperature, Climate Change, Height, Vertical Distribution

Scientific paper

We have evaluated the height profiles of both globally averaged net radiative heating and the global mean temperature for heights between 15 and 110 km for March, June, September, and December. This latter quantity was obtained from the thermal balance equation taking account only of radiative processes and molecular heat conduction. The global mean net dynamical heating, which we assume to be mainly due to net wave heating, has been estimated by using only radiation calculations. This heating as a function of height is wave-like and both postive and negative, its vertical profiles are rather similar for various months, and its absolute value is not more than approximately 5 K/day below 105 km. We recommend using the evaluated global mean net dynamical heating for the parameterization of net wave heating.

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