Energy distributions of the large-scale horizontal currents caused by wind in the baroclinic ocean |
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| Authors: | Email author" target="_blank">Lei?ZhouEmail author Jiwei?Tian Dongxiao?Wang |
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| Institution: | 1. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, China
2. Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangdong 510301, China |
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| Abstract: | Ocean current data for nearly 3 months in the South China Sea (SCS), combined with the NCEP/NCAR reanalysis wind data, are
analyzed. The results indicate that the wind energy enters the upper mixed layer in a wide continuous frequency band. In addition,
the interaction between the low-frequency wind anomaly and the low-frequency current anomaly is the most ‘effective’ way for
the energy input from the wind to the upper ocean. However, only the inertial and the near inertial energy propagate downwards
through the upper mixed layer. The downward-propagating energy is distributed into the barotropic currents, the baroclinic
currents and each mode of the baroclinic currents following the normal distributions. The energy change ratios between the
barotropic motion to the baroclinic motion induced by the wind present a normal distribution of N (0.0242, 0.3947). The energy
change ratios of the first 4 baroclinic modes to the whole baroclinic currents also follow the normal distributions. The first
baroclinic mode follows N (0.2628, 0.1872), the second N (0.1979, 0.1504), the third N (0.1331, 0.1633), and the fourth N
(0.0650, 0.1540), respectively. |
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| Keywords: | wind anomaly ocean current anomaly energy transportation wide frequency band near-inertial fre- quency energy distribution |
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