Abstract
Based on observations and a set of Atmospheric Model Intercomparison Project (AMIP)-type simulations, the climatic characteristics and dominant spatial patterns of summer rainfall on tropospheric biennial oscillation (TBO) time scales over the East Asian summer monsoon (EASM) region were examined, and the association with sea sur- face temperature anomalies (SSTAs) and El Nino-Southern Oscillation were analyzed. It was noted that to some extent, the AMIP run successfully simulated the spatial distribu- tion and amplitude of the observed TBO component. Fur- thermore, the AMIP ensemble mean increased the fraction of total variance of the TBO component, suggesting that SSTAs may have a rainfall response over the EASM region on TBO time scales. The analysis also indicated that a spa- tial pattern of rainfall on TBO time scales with opposite variations between northern and southern China showed a consistent and robust relationship with SSTAs in the tropi- cal Pacific Ocean in both the AMIP simulations and obser - vations. Statistically,when an El Nino (La Nina) develops, northern China favors dry (wet) conditions and southern China favors wet (dry) conditions at TBO time scales.
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