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Sensitivity of the solutions of the barotropic stability analysis of low level monsoonal zonal flow to meridional resolution of the numerical model

Subrahmanyam, D (1985) Sensitivity of the solutions of the barotropic stability analysis of low level monsoonal zonal flow to meridional resolution of the numerical model. Archives for Meteorology, Geophysics, and Bioclimatology Series A, 33 (4). pp. 263-275.

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Abstract

The sensitivity of the solutions of a numerical barotropic stability analysis of low level monsoonal zonal flow to the meridional grid set up was studied using a variable meridional grid in the channel 5°N to 25°N. It was found that the errors in the solutions arising due to the replacement of the continuous variability of the basic zonal flow with the discrete values at the grid points can be attributed to two different factors associated with the grid. Firstly the solutions (growth rates and wave lengths of unstable waves) are found to be quite sensitive to the grid length and the second and more serious problem was the apparent sensitivity of the solutions to the grid point locations. This sensitivity seems to yield significantly different sets of solutions for different grid setups (in respect of their grid point locations), but for basically the same basic flow profile and grid sizes. The above errors, which are significant for large grid sizes, tend to disappear when the grid size is decreased to a critical or less than a critical value, which was found to be about 0.8° latitude for the low level monsoonal zonal flow. The critical values for different types of zonal flows may be different and should be taken care of before performing barotropic stability analysis.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer-Verlag
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Apr 2015 11:03
Last Modified: 22 Apr 2015 11:03
URI: http://moeseprints.incois.gov.in/id/eprint/1242

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