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《Chinese Journal of Geophysics》 2008-01
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Formation mechanism of the "Stability Gap" and the North Pacific Central Mode Water

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  
Local feature of the formation region (165°E~160°W,38°N~42°N) of the North Pacific Central Mode Water (NPCMW) is first put forward from data analysis, and for which, the external atmospheric forcing (solar shortwave radiation, net heat flux and wind stress curl) could not give acceptable explanation. Further analysis on the seasonal variability of the upper ocean stratification shows that a special weak zone of the ocean stratification in the upper ocean (75 m)-the "stability gap" is detected in (165°E~160°W,38°N~42°N) in autumn (September-October). As "Precondition Mechanism", the "stability gap" provides a reliable answer for the "local feature" of the formation of the NPCMW. Based on a heat balance equation of the upper ocean mixed layer, diagnostic analysis suggests that the formation of the "stability gap" is the cooperative product of the surface heat flux forcing, vertical entrainment, Ekman advection and geostrophic advction. Among which, the latitudinal differences of the surface heat flux forcing, the cold Ekman advection and the warm geostrophic advection play the crucial roles on determining the critical eastern and western bound of the "stability gap".
【Fund】: 国家重点基础研究发展计划项目(第二课题2007CB816002);; 国家自然科学基金(40333030 40406005);; 基本科研业务费专项资金(海三科2007018);; 国家海洋局青年海洋科学基金(2006206 2007208)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 3 Hits
1 LIU Qin-Yu,LI Li-JuanPhysical Oceanography Laboratory & Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100,China;Baroclinic stability of oceanic long Rossby wave in the North Pacific Subtropical Countercurrent[J];Chinese Journal of Geophysics;2007-01
2 SONG Xiang-zhou1,LIN Xiao-pei1,Myrtle-Rose Padmore2,ZHENG Pei-nan1,QIAN Hui1(1. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100,China;2. Department of Chemical Engineering,Yale University,New Haven, CT 06520);Spacial Structure and Annual Variation Estimated from Argo Float Data for Subtropical Mode Water in the Northwest Pacific Ocean[J];Advances in Marine Science;2009-01
3 LIU Qin-yu(Physical Oceanography Laboratory & Ocean-Atmospheric Interaction and Climate Laboratory, Ocean University of China, Qingdao 266003,China);Study on Climate Variability of the Subtropical Gyre in the North Pacific[J];Journal of Ocean University of Qingdao;2004-05
【Secondary Citations】
Chinese Journal Full-text Database 3 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
2 Guan Bingxian(Institute of Oceanology, Academia Sinica, Qingdao);A SKETCH OF THE STUDY OF THE SUBTROPICAL COUNTERCURRENT IN THE PAST TWO DECADES[J];;1987-04
3 Gu Yuhe; Sun Xiangping; Xu Lanying(Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071)(First Institute of Oceanography, State Oceanic Administration, Qingdao 266003);Subtropical countercurrent at the 137°E longitudinal section[J];ACTA OCEANOLOGICA SINICA;1999-05
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