Small-scale temperature fluctuations associated with gravity waves cause additional radiative cooling of mesopause the region

Details Small-scale temperature fluctuations associated with gravity waves cause additional radiative cooling of mesopause the region Small-scale temperature fluctuations associated with gravity waves cause additional radiative cooling of mesopause the region

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3424807k&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 24, CiteID L24807

Physics

2

Atmospheric Processes: Radiative Processes, Atmospheric Processes: Acoustic-Gravity Waves, Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry

Scientific paper

We present a study of the radiative cooling of the mesosphere and lower thermosphere in the infrared bands of CO2, O3 and H2O due to small-scale irregular temperature fluctuations caused by gravity waves. These persistent fluctuations are presently not well represented by general circulation models. A statistical model of gravity wave-induced temperature variations was applied to large-scale temperature profiles, and the corresponding direct radiative calculations were performed. We show that temperature fluctuations can cause an additional cooling up to 3 K day-1 near the mesopause. The effect is produced mainly by the fundamental 15 μm band of the main CO2 isotope. We found a simple correction depending on the temperature fluctuations variance, which should be added in radiative calculations to the mean temperature profile to account for the additional cooling associated with the unresolved disturbances.

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