Interaction between the Quasi-Biennial Oscillation in far west equatorialPacific (QBOWP) and the El Nino/Southern Oscillation (ENSO) is studied using a new conceptual model.In this conceptual model, the QBOWP effects on ENSO are achieved through two ways: (1) the oceanicKelvin wave along equatorial Pacific, and (2) the Atmospheric Walker Circulation anomaly, while ENSOeffects on QBOWP can be accomplished by the atmospheric Walker Circulation anomaly. Diagnosisanalysis of the model results shows that the Atmospheric bridge (Walker circulation) plays a moreimportant role in interaction between the ENSO and QBOWP than the oceanic bridge (oceanic Kelvinwave along equatorial Pacific); It is found that by the interaction of the ENSO and QBOWP, a freeENSO oscillation with 3-5 years period could be substituted by a oscillation with the quasi-biennialperiod, and the dominant period of SST anomaly and wind anomaly in the far west equatorial Pacifictends to be prolonged with enhanced ENSO forcing. Generally, the multi-period variability in thecoupled Atmosphere-Ocean System in the Tropical Pacific can be achieved through the interactionbetween ENSO and QBOWP.
LIU Qinyu1, LIU Zhengyu2,1 & PAN Aijun 1,3 1. Physical Oceanography Lab. & Atmosphere-Ocean Interaction and Climate Lab., Ocean University of China, Qingdao 266003, China
A comparative study between the output of the Flexible Global Climate Model Version 1.0 （FGCM- 1.0） and the observations is performed. At 500 hPa, the geopotential height of FGCM is similar to the observations, but in the North Pacific the model gives lower values, and the differences are most significant over the northern boundary of the Pacific. In a net heat flux comparison, the spatial patterns of the two are similar in winter, but more heat loss appears to the east of Japan in FGCM than in COADS. On the interannual timescale, strong （weak） Kuroshio transports to the east of Taiwan lead the increasing （decreasing） net heat flux, which is centered over the Kuroshio Extension region, by 1-2 months, with low （high） pressure anomaly responses appearing at 500 hPa over the North Pacific （north of 25°N） in winter. The northward heat transport of the Kuroshio is one of the important heat sources to support the warming of the atmosphere by the ocean and the formation of the low pressure anomaly at 500 hPa over the North Pacific in winter.
