The Differences of Quasi-stationary Planetary Wave Distribution and Mean Zonal Wind Speed Between Drought and Flood Years in Summer in the Changjiang and Huaihe River Basins

The differences of quasi-stationary planetary wave distribution and mean zonal wind speed between drought and flood years in summer during 1980’s in the Changjiang and Huaihe River Basins are examined. It is indicated that the central intensity and location of tropical easterly jet are stronger and more southerly in drought years than in flood years. But the latitude location of subtropical westerly jet is more northerly. The summer quasi-stationary planetary wave distributions in drought (flood) years reflect the external source forcing effect by strong (weak) heat source anomaly over around the Philippines and the Tibet Plateau. The differences appear mainly in latitude location relative to large value region of wave amplitude for the mid-high latitudes. The amplitude anomaly distributions of zonal wave numbers of quasi-stationary planetary wave in the E1 Nino events are contrary to those in La Nina events.