Features of eddy diffusion of momentum and heat in stably stratified flows of environment
A.F. Kurbatskiy1,2 and L.I. Kurbatskaya3
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Institute for Computational Mathematics and Mathematical Geophysics SB RAS, Novosibirsk, Russia
E-mail: kurbat@itam.nsc.ru
Keywords: turbulence, planetary boundary layer, upper troposphere and lower stratosphere, eddy diffusivity for momentum and heat
Pages: 163–176
Abstract
The study was performed on features of eddy transport of momentum and heat in the lower atmosphere, which includes the planetary boundary layer as well as upper troposphere and lower stratosphere; the study used a three-parametric method for modeling of stratified turbulent flows. A focus was put on analysis of behavior of vertical diffusivities of momentum and heat: data were obtained through direct measurements and through simulation with three-parametric turbulence model with account for effects of internal gravitational waves which support momentum transfer under condition of very stable stratification (while possessing considerable wavy dynamics). It was demonstrated that the profile of vertical diffusivity for momentum, which was calculated using three-parametric turbulence model, is in agreement with data on direct measurements when measured either within a stable stratified planetary boundary layer or beyond this layer, in free atmosphere.
DOI: http://dx.doi.org/10.1134/S0869864315020031
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