MAINTENANCE MECHANISMS OF UPPER TROPOSPHERIC STATIONARY WAVE ANOMALY TELECONNECTION PATTERNS

The spatial structure and time variations of Northern Hemisphere winter upper tropospheric stationary wave ano malies are studied with the ECMWF DATA of 1980-1988 and PCA(Principal Component Analysis)method.The vorticity source anomalies of the main teleconnection patterns are analy sed and their roles in the maintenance of the stationary wave anomaly teleconnection patterns are investigated with the barot ropic model.The results show that the anomalies of transient vorticity flux convergences tend to cancel the anomaly of vorticity sources generated by divergent winds.The stationary wave anomaly patterns caused by divergent wind anomaly only are very different from that of the observations,but,if the anomalous transient vorticity flux convergences are also included in the vorticity sources,the simulated patterns will be greatly improved.