Abstract
The relationship between Southern Hemisphere (SH) atmospheric circulation and the summer rainfall over the Yangtze River Valley using the composition analysis is discussed in this paper. The results show Antarctic Oscillation (AAO) in boreal spring (MAM) is much remarkable than that in boreal summer (JJA). The SH Subtropical Highs have good seasonal persistence from MAM to JJA. Therefore, SH circulation anomaly in MAM is one of important short-term climate predictors for summer rainfall over Yangtze River Valley. The inter-hemispheric high latitudes interaction impacts on summer rainfall over Yangtze River Valley. One possible physical mechanism is barotropical wave train distributed from high latitude in SH to coast of the East Asia. Second possible physical mechanism is the inter-hemispheric temperature gradient decrease due to SH temperature increase in the whole troposphere from MAM to JJA, consequently, causing the weak summer Asian monsoon and more summer rainfall over Yangtze River Valley.
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