The relationship Between the East Asian Summer Climate Variability and the Indian Ocean Dipole

Using both the reanalysis data and an Atmospheric General Circulation Model, we have studied the influences of the Indian Ocean dipole (IOD) on the East Asian summer climate. Our results demonstrate that the East Asian summer climate during July-August is indeed affected by the Indian Ocean dipole. The East Asia experiences an anomalously hot and dry summer climate during the positive IOD event. An anomalous cyclonic circulation induced by IOD Over the Western Pacific and the south part of China weakens the monsoonal south wind from Bay of Bengal, South China Sea, and Western Pacific in the tropical region. The IOD sea surface temperature anomaly can also induce the anomalous changes in circulation over the Mediterranean and Sahara areas. The eastward propagation of Rossby wave energy induced by IOD along the Asian westerly jet stream also plays an important role the anomalous circulation changes over East Asia.