Assessing the energetics and dynamics of the Gulf Stream at 68W from moored current measurements
Assessing the energetics and dynamics of the Gulf Stream at 68W from moored current measurements
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通过系泊电流测量评估 68W 墨西哥湾流的能量和动力学
DOI：
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
M. Hall
中科院分区：
文献类型：
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作者：
M. Hall
利用整个水柱的速度和温度的一年时间序列，研究了68W湾流的能量学和动力学。主要结果如下：(1)平均动能和势能有净转换，正压机制的强度几乎是斜压机制的两倍。这些能量交换主要是在水柱上方1000米发生的事情。(2)与其他研究的对比表明，系泊点可能具有涡旋能量下游空间增长的特征，其增长率为3—4 × 10—3 km-l•(3)由于水流路径变化引起的曲率变化足以平衡温跃层以下水柱的拉伸，这是涡度方程中主要的可测量效应。(4)包括正压横流速度、局部温度变化、拉伸和曲率变化在内的运动学方案与观测数据基本一致。(5) joz的垂直质量散度影响最低阶的连续性，并可能与沿流输运的变化、沿流动量通量的垂直再分布或河流宽度的变化有关。
The energetics and dynamics of the Gulf Stream at 68W have been investigated using year-long time series of velocity and temperature throughout the water column. The major results that have emerged are as follows: (1) There is a net conversion of mean to eddy kinetic and potential energies, the barotropic mechanism being almost twice as strong as the baroclinic. These energy exchanges are dominated by what is happening in the upper 1000 m of the water column. (2) Comparison with other studies suggests that the mooring site may be characterized as a region of downstream spatial growth in eddy energy, with a growth rate of 3--4 x 1O-3 km-l• (3) Curvature changes due to the changing Stream path are sufficient to balance stretching of the water column below the thermocline, the dominant measurable effect in the vorticity equation. (4) A kinematic scheme including and relating barotropic cross-stream velocities, local temperature changes, stretching, and curvature changes is shown to be generally consistent with the observed data. (5) The vertical mass divergence ow j oz affects continuity at lowest order, and may be associated with along-stream changes in transport, a vertical redistribution of the alongstream momentum flux, or changing Stream width.