Mesospheric temperature inversions with overlying nearly adiabatic lapse rate: An indication of a well-mixed turbulent layer

Details Mesospheric temperature inversions with overlying nearly adiabatic lapse rate: An indication of a well-mixed turbulent layer Mesospheric temperature inversions with overlying nearly adiabatic lapse rate: An indication of a well-mixed turbulent layer

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1201w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 10, p. 1201-1204

Physics

29

Adiabatic Conditions, Altitude, Lapse Rate, Mesosphere, Summer, Temperature Inversions, Turbulent Mixing, Winter, Backscattering, Mathematical Models, Optical Radar, Radiative Transfer, Temperature Profiles, Turbulent Diffusion

Scientific paper

The Rayleigh lidar technique was applied to study the thermal structure of the middle atmosphere. Observations were carried out on a routine basis for one year (130 clear nights) at the main campus of York University near Toronto (44 deg N, 80 deg W). Mesospheric temperature inversions were generaly found to occur below a height of 70 km during winter and above during summer. The most interesting aspect of our observations was that the inversions were often associated with an overlying nearly adiabatic lapse rate which extended for several kilometres. We interpret this as being an indication (or signature) of a well-mixed turbulent layer. A one-dimensional numerical model was applied to demonstrate that a well-defined turbulent layer within the mesosphere can bring about a thermal structure quite similar to that which was commonly observed - an inversion with overlying nearly adiabatic lapse.

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