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Spatial Patterns of Tropospheric Biennial Oscillation and Its Numerical Simulation

S.Masson  T.Yamagata  
【摘要】:In order to investigate the spatial patterns of Tropospheric Biennial Oscillation(TBO) in the global region,the Climate Prediction Center(CPC) Merged Analysis of Precipitation(CMAP) monthly averaged precipitation and the Climate Diagnostics Center(CDC) monthly outgoing long-wave radiation(OLR) and sea surface temperature(SST) are used by TBO bandpass-filtering.The results indicate active biennial variability in the tropical eastern-central Pacific regions.It is evident that observations reflect the biennial component of the ENSO rather than the TBO itself.Since some studies had pointed out that the TBO is a broad-scale phenomenon differing from the ENSO,to investigate the pure TBO must exclude the ENSO signal.The SINTEX-F coupled general circulation model(CGCM) developed at Japan Frontier Research Center for Global Change can capture both the ENSO and the biennial signals.So air-sea interactions in the tropical eastern-central Pacific are decoupled to eliminate the effects of the ENSO in a experiment by the SINTEX-F and the results show that biennial variability still exists even without the ENSO.It seems to mean that the TBO and ENSO are independent from each other.Furthermore,the model results indicate the two key regions in the southwest to Sumatra and tropical western pacific for the TBO cycle.

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