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Volume 42 Issue 9
Nov.  2020
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Article Contents
Kuang Fangfang,Pan Aijun,Zhang Junpeng, et al. Low frequency variation of abyssal current east of the Luzon Strait: Cast study from in situ observation[J]. Haiyang Xuebao,2020, 42(9):1–8 doi: 10.3969/j.issn.0253-4193.2020.09.001
Citation: Kuang Fangfang,Pan Aijun,Zhang Junpeng, et al. Low frequency variation of abyssal current east of the Luzon Strait: Cast study from in situ observation[J]. Haiyang Xuebao,2020, 42(9):1–8 doi: 10.3969/j.issn.0253-4193.2020.09.001

Low frequency variation of abyssal current east of the Luzon Strait: Cast study from in situ observation

doi: 10.3969/j.issn.0253-4193.2020.09.001
  • Received Date: 2019-05-21
  • Rev Recd Date: 2019-07-12
  • Available Online: 2021-04-21
  • Publish Date: 2020-09-25
  • In order to investigate long-term variations of deep sea currents and temperature in the east of the Luzon Strait, a submarine mooring system was made at 19.75°N, 126.75°E from May 2015 to May 2016 in the Philippine Sea. The vertical distribution of ocean currents and its temporal variation characteristics are analyzed in the paper. Several features show that: (1) In the upper layer (100~160 m) , the average current velocity is about 12.5 cm/s with average flow direction oriented northwest; in the middle layer (810 m), the average current velocity is about 2.6 cm/s with flow direction oriented westward; in the deep layer of 1 550 m and 2 560 m, the average current velocity is small and less than 1 cm/s whereas that in 4 040 m is about 2.3 cm/s and oriented southwest. (2) The kinetic energy of the upper layer is one to two orders of magnitude compared with the middle and the deep layers. In the deep layer, the total kinetic energy and average kinetic energy in the 4 040 m layer is the largest, with smallest total kinetic energy and eddy kinetic energy in the 2 560 m layer, and with smallest averaged kinetic energy and largest eddy kinetic energy in the 1 550 m layer. Meanwhile, eddy kinetic energy is larger than averaged kinetic energy in all the layers. (3) The wavelet analysis shows that ocean current exhibits a low-frequency oscillation period of 81~85 d in layers shallower than 2 560 m, while the current at 4 040 m shows 51 d oscillation period.
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