Systematic Errors of the CWB Global Forecast Model Part I: Fundamental Variables and Mean Meridional Circulation

Abstract

The Central Weather Bureau (CWB) of the Republic of China officially began its NWP operation on July 1, 1988. The global forecast model at CWB is a multi-level grid point model with fourth order potential enstrophy conservation scheme in the horizontal differencing. Based on the forecast data, January and July model climatology from the day-1, day-2, and day-3 forecasts are constructed. Also the simulated mean meridional circulation are investigated. The systematic errors can be identified by comparing the model climatology with the observed analyses.

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