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: K= ω ̌ m3 (1+m′/m) 1 2H + 3 2 m N σ u σz ; ω ̌ (y)= ƒ 0.3 , m (z)= 1.5km exp(− z 34km ), m′(z)=3m where m and w ̂ 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, u 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 K dot exp (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.


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    Title :

    A parameterization of vertical eddy diffusivity by using “quasi-monochromatic” gravity-wave field hypothesis


    Contributors:

    Published in:

    Advances in Space Research ; 12 , 10 ; 215-218


    Publication date :

    1992-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




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