Tropical Intraseasonal Variability and the Stochastic Skeleton Method by Andrew J. Majda & Samuel N. Stechmann & Shengqian Chen & H. Reed Ogrosky & Sulian Thual

Author:Andrew J. Majda & Samuel N. Stechmann & Shengqian Chen & H. Reed Ogrosky & Sulian Thual
Language: eng
Format: epub
ISBN: 9783030222475
Publisher: Springer International Publishing

(4.25a)

(4.25b)

The wind shear introduces two additional linear terms with coefficients f 1 and f 2, both of which are real values. (The resonance condition is the same as it was earlier in the case without wind shear.) Numerical simulations were performed for MJO initiation with the effects of barotropic shear. Four different barotropic shear profiles were considered. (1) U 0 = 0, B 0 = 1, (2) U 0 = −1, B 0 = 1, (3) U 0 = 1, B 0 = 0, and (4) U 0 = 1, B 0 = 1. The results for the four cases (not shown here) suggest that the barotropic shear has little effect on the maximum amplitude attained by the MJO and the time period of the solution. The small effect of wind shear here differs from the important effects of wind shear seen by Majda and Biello (2003), and several differences in the models could contribute to the different results. In particular, in the model of Majda and Biello (2003), the waves are all nondispersive; resonant interactions are included for all wavenumbers rather than a small discrete subset of wavenumbers; and moisture and convection are not explicitly included.

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