AbstractThe vertical eddy diffusivity K in the middle atmosphere is parameterized as a continuous function of space and time, using a model of “quasi-monochromatic” parameters of breaking internal gravity waves: where and are characteristic values of the vertical wavenumber and the intrinsic frequency, m′ is a parameter representing the localization of wave-induced turbulence, H is the density scale height, N and f are the Väisälä-Brunt and Coriolis frequencies, is the mean zonal velocity, and y and z are the latitude and altitude. In case of m′ = 0 the equation giving K has exactly the same form as that of Lindzen, but here we can parameterize K as a continuous function. In general (z/11km). Using H, N and ū obtained or calculated from CIRA86, s seasonally/meridionally varying vertical distributions of K are calculated and shown to fit well to chemical and modeling studies.
A parameterization of vertical eddy diffusivity by using “quasi-monochromatic” gravity-wave field hypothesis
Advances in Space Research ; 12 , 10 ; 215-218
01.01.1992
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch