Additional Radiative Cooling of the Mesopause Region due to Small-Scale Temperature and [O] Fluctuations Associated with Gravity Waves

Details Additional Radiative Cooling of the Mesopause Region due to Small-Scale Temperature and [O] Fluctuations Associated with Gravity Waves Additional Radiative Cooling of the Mesopause Region due to Small-Scale Temperature and [O] Fluctuations Associated with Gravity Waves

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51a1208k&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA51A-1208

Physics

[0342] Atmospheric Composition And Structure / Middle Atmosphere: Energy Deposition

Scientific paper

We address a previously unknown effect of the radiative cooling of the mesosphere and lower thermosphere (MLT) produced by small-scale irregular temperature fluctuations (ITFs) as well as [O] fluctuations associated with gravity waves. These disturbances are not well resolved by present GCMs, but they alter the radiative transfer and the cooling rates significantly. We apply a statistical model of gravity waves and perform direct calculations of the radiative cooling/heating in the MLT in the IR bands of CO2 , O3 and H2O molecules taking into account the breakdown of the local thermodynamic equilibrium (non-LTE). We found that in the periods of strong wave activity the subgrid ITFs can cause an additional cooling up to 5 K/day near the mesopause. The effect is produced mainly by the fundamental 15 µm band of the main CO2 isotope. We derived [Kutepov et al., GRL, doi:10.1029/2007GL032392, 2007] a simple expression for the correction to mean (resolved by GCMs) temperature profiles using the variance of the temperature perturbations to account for the additional cooling effect. The utilization of this expression in the LIMA model lead to a colder and broadener summer mesopause which is in agreement to new lidar measurements at Spitsbergen and ALOMAR. We also study how the accounting for the fluctuation of the [O] density caused by the gravity waves influences this additional cooling of MLT.

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