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首页> 外文期刊>Journal of Physical Oceanography >Response of the Internal Wave Field to Remote Wind Forcing by Tropical Cyclones
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Response of the Internal Wave Field to Remote Wind Forcing by Tropical Cyclones

机译：内部波场对热带气旋对远程强迫风的响应

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摘要

In the tropical North Atlantic, mean winds introduce relatively little energy into the internal wave field, but hurricanes act as very energetic sources for near-inertial waves. In addition to the eventlike passage of such tropical cyclones, changes in the wind speed north of the trade wind system induce a seasonal cycle in surface swell, with potential implications for the high-frequency part of the internal wave field. Using a 5-yr mooring time series in the interior of the tropical North Atlantic at 16 degrees N, the temporal variability of internal wave energy south of the main hurricane track in different frequency bands is studied, and the magnitude of its variability, along with possible energy transfer mechanisms, is analyzed. The results show that changes in near-inertial energy are dominated by the passage of internal waves generated by hurricanes centered several hundred kilometers north of the mooring. The major role of hurricanes in the generation of near-inertial waves is also seen in an extended slab model that takes the horizontal divergence of the near-inertial current field at the mixed layer base into account. A seasonal cycle is observed in the energy at the high-frequency end (frequencies above 6 cpd) of the internal wave spectrum. It is not in phase with the near-inertial energy variability but covaries with changes in the local surface waves. These high-frequency internal waves are most energetic at times when large-amplitude surface swell with long periods and correspondingly long wavelengths is observed.
机译：在热带北大西洋，平均风向内部波场引入的能量相对较少，但是飓风是近惯性波的非常有力的能源。除了这种热带气旋的事件通过外，商风系统以北的风速变化还会引起地表膨胀的季节性变化，这可能会对内部波场的高频部分产生影响。利用北大西洋内部北纬16度的5年系泊时间序列，研究了主飓风道以南在不同频段内内部波能的时间变化，并研究了其变化幅度以及分析了可能的能量传递机制。结果表明，近惯性能量的变化主要由中心在系泊设备以北数百公里的飓风产生的内部波的传播所主导。在扩展平板模型中还可以看到飓风在近惯性波产生中的主要作用，该模型考虑了混合层基底处近惯性电流场的水平发散。在内部波谱的高频端（高于6 cpd的频率）的能量中观察到一个季节性周期。它与近惯性能量变化不是同相的，而是与局部表面波的变化共变的。当观察到大幅度的表面长周期膨胀并观察到相应的长波长时，这些高频内部波的能量最高。

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