Numerical Simulation of the Effect of the SST Anomalies in the Tropical Western Pacific on the Blocking Highs over the Northeastern Asia

The effects of the sea surface temperature (SST) anomalies in the tropical western Pacific on the atmospheric cir-culation anomalies over East Asia are simulated by the IAP-GCM with an observed and idealized distributions of the SST anomalies in the tropical western Pacific, respectively Firstly, the atmospheric circulation anomalies during July and August, 1980 are simulated by three anomalous experiments including the global SST anomaly experiment, the tropical SST anomaly experiment and the extratropical SST anomaly experiment, using the observed SST anomalies in 1980. It is shown that the SST anomalies in the tropical ocean greatly influence the formation and maintenance of the blocking high over the northeastern Asia, and may play a more important role than the SST anomalies in the extratropical ocean in the influence on the atmospheric circulation anomalies Secondly, the effects of the SST anomalies in the tropical western Pacific on the atmospheric circulation anoma?lies over East Asia are also simulated with an idealized distribution of the SST anomalies in the tropical western Paci?fic. The simulated results show that the negative anomalies of SST in the tropical western Pacific have a significant ef?fect on the formation and maintenance of the blocking high over the northeastern Asia.