摘要
简述北黄海冷水团环流结构研究现状，指出已有研究成果中的主要问题。然后用一个诊断模型给出了冷水团环流结构，得到冷水团环向流动主要存在于海洋上层接近冷水团边界处；径向运动也主要存在于断面两端，上层为离岸流，下层为向岸流；冷水团中心的上升流极为微弱，且仅存在于海洋上层；温跃层下的冷水团中心区域的流动极为微弱，几乎为“死水”一般，上述环流结构对冷水团中心部分的温、盐度长期保持不变及跃层底部溶解氧最大值的形成和保持极为有利。最后用卫星及实测海流资料佐证了所述环流结构。
Chnese scientists have conducted many studies on the radial circulations of the Northern Yellow Sea Cold Water Mass (NYSCWM). Early researchers (Guan,1962; Yuan, 1979; Miao, 1989) thought that notable upwelling appears in the central part of the NYSCWM and downwelling near its boundary areas. But these cannot ex-plain why the dissolved oxygen maalmum near the bottom of the thermocline, and T S characteristics in the central part of the cold water mass remain unvarying for long time. Yuan and Li (1993) 's solution of Yuan (1979)'s mathematical model was bassed on the assumption of a very level isotherm and omitted the T / r term. In fact, because of the existence of a tidal front, T/ r becomes very large (maximum)in the boundary areas of the NYSCWM: So the T/r term should not be disregarded as negligible.We started to study tidal mixing and tidal fronts in the Yellow Sea in 1985 and pointed out that upwelling in the NYSCWM's boundary areas is more noticeable than that at its centre. To clarify the NYSCWM's circulations characteristics a diagnostic model of tidal front was used to find a numerical solution, which showed mainly circular currents in the upper layer near the NYSCWM boundary, Radial movement of off-shore currents in the upper layer, shoreward currents in the lower layer, the strong upwelling in boundary areas, very weak upwelling in the NYSCWM's upper layer only, and a pound of stagnant water under the thermocline. The above circulation structure of the NYSCWM keeps the dissolved oxygen maxmum near the bottom of the thermocline and stabilizes the T S property of the NYSCWM. Meas-ured currtny data and satellite pictures were used to verify the above circulation pat-tern and show that the Ekman pumping by inner friction of stratified fluld at the thermocline is the main driving force for above the radial circulations.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1996年第4期420-435,T001,共17页
Oceanologia Et Limnologia Sinica
基金
国家重点基金!49130015
关键词
北黄海
冷水团
诊断模型
环流结构
潮汐
混合锋
Radial circulations Upwelling Northen Yellow Sea Cold Water Mass Diagnostic model
