Publication Date:
2019-07-12
Description:
The mechanism for the scale selection of tropical intraseasonal oscillations (ISO), was investigated using two models which differed only in the cumulus parameterization. In the first, more complicated model, moisture budgets are treated explicitly, and the cumulus parameterization of Kuo (1974) is used. Using this model, the ISO with the wavenumber 1 structure was successfully reproduced, and some possible nonlinear causes for the selection of wavenumber 1 were specified. The second model does not employ moisture; in this model, cumulus convection is related to low-level convergence only. The three possible causes obtained in the first experiment were parameterized, and could be added to or eliminated from the second model, making it possible to determine which nonlinear property was essential for the mechanism of the wavenumber selection.
Keywords:
METEOROLOGY AND CLIMATOLOGY
Type:
Journal of the Atmospheric Sciences (ISSN 0022-4928); 46; 1779-179
Format:
text
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