Seasonal Cycle of the Climatological Stationary Waves in the NCEP–NCAR Reanalysis

Abstract The maintenance mechanisms of the climatological stationary waves and their seasonal cycle are investigated with a linear stationary wave model and the National Centers for Environmental Prediction–National Center for Atmospheric Research (NCEP–NCAR) reanalysis data from 1985 to 1993. The stationary wave model is linearized about the zonal-mean flow and subjected to the zonally asymmetric stationary wave forcings. It has rhomboidal wavenumber 30 truncation and 14 vertical sigma levels. The forcings for the linear model include diabatic heating, orography, stationary nonlinearity, and transient vorticity and heat flux convergences. The NCEP–NCAR reanalysis provides a high quality global dataset for this study. When the linear model is subjected to all forcings, it reproduces reasonably well the climatological stationary wave seasonal cycle. The linear stationary wave theory is quantitatively valid at the upper-tropospheric levels for all months and the lower-tropospheric levels for the northern su...

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