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《Chinese Journal of Geophysics》 2007-01
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Baroclinic stability of oceanic long Rossby wave in the North Pacific Subtropical Countercurrent

LIU Qin-Yu,LI Li-JuanPhysical Oceanography Laboratory & Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100,China  
Based on the analysis of Sea Surface Height Anomaly(SSHA) from satellite observation,it is proved that the oscillation with period of 70~210 days is dominating in two branches of the eastward countercurrent in Subtropical North Pacific: Subtropical Countercurrent(STCC) and Hawaiian Lee Countercurrent(HLCC). It is found that in the STCC the amplitude of the Rossby wave,corresponding to the SSHA oscillation with period of 70~210 days,increases when the wave propagates westward,and the amplitude is the largest in east of Taiwan.In HLCC,the amplitude of Rossby wave with period of 70~210 days doesn't increase when the wave propagates westward.Based on the relation of Rossby wave's growth rate with mean current and stratification from 2.5-layer model,it is revealed that in STCC area the Rossby wave with period of 70~210 days is unstable and the amplification mechanism of Rossby wave is baroclinic instability,because there is low potential vorticity water under STCC and the vertical gradient of density is smaller than that in HLCC.Since there is no low potential vorticity water the Rossby wave with period of 70~210 days is stable in the west of HLCC,there is no amplification event when Rossby wave propagates westwards in HLCC.In STCC and HLCC,the Rossby wave with 1 year period is always stable,its amplitude is smaller than that of the unstable Rossby wave with period of 70~210 days.
【Fund】: 国家自然科学基金重点项目(40333030)资助
【CateGory Index】: P732
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 Li Wei 1) , Liu Hailong 1) , and Liu Qinyu 2) 1) (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 ) 2) (Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266003);Two Branches of the Eastward Countercurrent in the Subtropical Region of the North Pacific[J];Chinese Journal of Atmospheric Sciences;2003-05
【Co-citations】
Chinese Journal Full-text Database 5 Hits
1 PAN Ai-Jun~ 1, 2 ,LIU Qin-Yu~1,LIU Zheng-Yu~ 3,1 1 Physical Oceanography Lab., Ocean University of China, Qingdao 266003, China2 Environment and Dynamics Lab., Third Institute of Oceanography, Xiamen 361005, China3 Center for Climate Research, University of Wisconsin-Madison, WI 53706-1695, USA;Formation mechanism of the "Stability Gap" and the North Pacific Central Mode Water[J];Chinese Journal of Geophysics;2008-01
2 HU Rui Jin,LIU Qin Yu (College of Physical and Environmental Oceanography,Ocean University of Qingdao, Qingdao,266003);ANNUAL AND INTRASEASONAL VARIATIONS IN SEA SURFACE HEIGHT OVER THE TROPICAL PACIFIC[J];Oceanologia Et Limnologia Sinica;2002-03
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1 Liu Qinyu, Yang Haijun and Bao Hongtong (Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao266003) Li Wei (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atm;Climatic Features of Subtropical Countercurrent in the North Pacific[J];SCIENTIA ATMOSPHERICA SINICA;2000-03
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【Secondary Citations】
Chinese Journal Full-text Database 2 Hits
1 Liu Qinyu, Yang Haijun and Bao Hongtong (Institute of Physical Oceanography, Ocean University of Qingdao, Qingdao266003) Li Wei (State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atm;Climatic Features of Subtropical Countercurrent in the North Pacific[J];SCIENTIA ATMOSPHERICA SINICA;2000-03
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