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Conceptual model about the interaction between El Nio/ Southern Oscillation and Quasi-Biennial Oscillation in far west equatorial Pacific

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Science china Earth Sciences 2006年第8期49卷 889-896页

作者： 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 2. Center for climate Research, university of Wisconsin-Madison, Madison, WI 53706-1695, USA 3. Environment and Dynamics lab., Third Institute of oceanography, Xiamen 361005, china

interaction between the Quasi-Biennial Oscillation in far west equatorialPacific (QBOWP) and the El Nino/Southern Oscillation (ENSO) is studied using a new conceptual *** this conceptual model, the QBOWP effects on ENSO are achieved through two ways: (1. the {1.icKelvin 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 {1.ic bridge ({1.ic 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-{1. System in the Tropical Pacific can be achieved through the interactionbetween ENSO and QBOWP.

关键词： El nino/southern oscillation quasi-biennial oscillation interaction coupled system kelvin wave walker circulation

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Subtropical Mode Water in the Northwestern Pacific

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Journal of ocean {1. of qingdao 2003年第2期2卷 134-140页

作者： pan aijun, liu qinyuphysical oceanography lab. & ocean-atmosphere interaction and climate lab., ocean university of china, qingdao 266003, P.R.china physical {1. lab. & ocean-atmosphere interaction and climate lab. Ocean University of ChinaQingdao 266003 P. R. China

Based on the in situ XBT and other data sets, by analyzing the seasonal cycle of the mixed layer depth (MLD) and using the conservative potential vorticity (PV) as a tool, a clear description of the formation process of the North Pacific Subtropical Mode Water (NPSTMW) is presented for explaining the well known 'Stommel Demon'. The forming of NPSTMW reflects well the ventilation process of the isotherms of the permanent thermocline. The formation process can be divided into the 'ventilation' phase and the 'formation' phase. In the first phase (October-March), with large heat losses at the sea surface from October, the mixed layer deepens and correspondingly, the water mass with low PV emerges and sinks. After continual cooling from October to March, the mixed layer reaches its maximum value ( >300 m) in March. Then, in the second phase (April-June), the mixed layer shoals rapidly from April, a large part of the low PV water mass is sheltered from further air-sea interaction by the emerging seasonal thermocline, and thus forms new NPSTMW. Further analysis indicates that the formation region of warm NPSTMW (1.-1.℃) is limited between 1.0°-1.0°E, while the relatively cold NPSTMW (1.-1.℃) originates in a wider longitude range (1.0°-1.0°E).{1. features of NPSTMW are presented with the use of climatological Levitus (1.94 a, b) dataset. It is shown that NPSTMW lies in the region of (1.0°-1.0°E, 22°-34°N) with core temperature ranging from about 1.-1.℃ and potential density around 25-25.8σθ NPSTMW has a three-dimensional structure lying below the seasonal thermocline (about 1.0 m deep) and reaches almost to 350m depths.

关键词： North Pacific Subtropical Mode Water (NPSTMW) ventilation process mixed layer depth (MLD) potential vorticity (PV)

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