Barotropic and Baroclinic Tides in the Central North Pacific Ocean Determined from Long-Range Reciprocal Acoustic Transmissions
Barotropic and Baroclinic Tides in the Central North Pacific Ocean Determined from Long-Range Reciprocal Acoustic Transmissions
复制标题
由长程相互声波传输确定的北太平洋中部正压和斜压潮汐
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
D. Luther
中科院分区：
文献类型：
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作者：
B. Dushaw;B. Howe;B. Cornuelle;P. Worcester;D. Luther
摘要利用1987年互易层析成像实验测得的1000公里范围声波传播时间，研究了北太平洋中部的正压潮流和大尺度相干斜压潮汐。走时倒数之差决定了潮流，走时倒数之和决定了等厚度线（或等价的等温线）的斜压潮汐位移。正压潮流占观测到的差走时方差的90%。正压潮的8个主要分潮的调和常数的实测值和流速计测量值与Schwiderski和Cartwright等人的数值潮汐模式一致。由总走时确定的第一模态斜压潮的振幅和相位与由系泊的变阻器和流速计确定的一致。斜压潮汐信号与一个大的-...
Abstract Travel times of reciprocal 1000-km range acoustic transmissions, determined from the 1987 Reciprocal Tomography Experiment, are used to study barotropic tidal currents and a large-scale, coherent baroclinic tide in the central North Pacific Ocean. The difference in reciprocal travel times determines the tidal currents, while the sum of reciprocal travel times determines the baroclinic tide displacement of isotachs (or equivalently, isotherms). The barotropic tidal current accounts for 90% of the observed differential travel time variance. The measured harmonic constants of the eight major tidal constituents of the barotropic tide and the constants determined from current meter measurements agree well with the empirical–numerical tidal models of Schwiderski and Cartwright et al. The amplitudes and phases of the first-mode baroclinic tide determined from sum travel times agree with those determined from moored thermistors and current meters. The baroclinic tidal signals are consistent with a large-...