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

Kuang Fangfang; Pan Aijun; Zhang Junpeng; Huang Jiang; Cai Shangzhan; Li Jiajun; Li Mo

doi:10.3969/j.issn.0253-4193.2020.09.001

Volume 42 Issue 9

Nov. 2020

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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

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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

1.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
2.
National Ocean Technology Center, Tianjin 300112, China

Received Date: 2019-05-21
Rev Recd Date: 2019-07-12

Available Online: 2021-04-21

Publish Date: 2020-09-25

Abstract

Abstract

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.
- full water depth,
- submarine mooring,
- low frequency variation,
- the Luzon Strait,
- the Philippine Sea

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References(12)

References

[1]	Uchida H, Yamamoto H, Ichikawa K, et al. Water properties and transports of abyssal water through the Wake Island Passage[J]. American Geophysical Union, 2006, 87(52): F1298.
[2]	Johnson G C, Toole J M. Flow of deep and bottom waters in the Pacific at 10°N[J]. Deep-Sea Research Part I: Oceanographic Research Papers, 1993, 40(2): 371−394. doi: 10.1016/0967-0637(93)90009-R
[3]	Kawabe M, Fujio S, Yanagimoto D. Deep-water circulation at low latitudes in the western North Pacific[J]. Deep-Sea Research Part I: Oceanographic Research Papers, 2003, 50(5): 631−656. doi: 10.1016/S0967-0637(03)00040-2
[4]	Owens W B, Warren B A. Deep circulation in the northwest corner of the Pacific Ocean[J]. Deep-Sea Research Part I: Oceanographic Research Papers, 2001, 48(4): 959−993. doi: 10.1016/S0967-0637(00)00076-5
[5]	Sokolov S, Rintoul S. Circulation and water masses of the southwest Pacific: WOCE Section P11, Papua New Guinea to Tasmania[J]. Journal of Marine Research, 2000, 58(2): 223−268. doi: 10.1357/002224000321511151
[6]	Wijffels S E, Hall M M, Joyce T, et al. Multiple deep gyres of the western North Pacific: a WOCE section along 149°E[J]. Journal of Geophysical Research: Oceans, 1998, 103(C6): 12985−13009. doi: 10.1029/98JC01016
[7]	Yanagimoto D, Kawabe M. Deep-circulation flow at mid-latitude in the western North Pacific[J]. Deep-Sea Research Part I: Oceanographic Research Papers, 2007, 54(12): 2067−2081. doi: 10.1016/j.dsr.2007.09.004
[8]	Yoshioka N, Endoh M, Ishizaki H. Observation of the abyssal current in the West Mariana Basin[J]. Journal of the Oceanographical Society of Japan, 1988, 44(1): 33−39. doi: 10.1007/BF02303148
[9]	梁楚进, 侯一筠, 陈琪, 等. 中国多金属结核开辟区近底低频流动特征[J]. 科学通报, 2004, 49(11): 1184−1189. doi: 10.1360/03wd0300 Liang Chujin, Hou Yijun, Chen Qi, et al. Characteristics of low-frequency components of the near-bottom current in the Chinese Pioneer Area[J]. Chinese Science Bulletin, 2004, 49(11): 1184−1189. doi: 10.1360/03wd0300
[10]	Kawabe M, Yanagimoto D, Kitagawa S, et al. Variations of the deep western boundary current in Wake Island Passage[J]. Deep-Sea Research Part I: Oceanographic Research Papers, 2005, 52(7): 1121−1137. doi: 10.1016/j.dsr.2004.12.009
[11]	Zhai Fangguo, Wang Qingye, Hu Dunxin, et al. Observation of the abyssal western boundary current in the Philippine Sea[J]. Chinese Journal of Oceanology and Limnology, 2014, 32(5): 1188−1197. doi: 10.1007/s00343-014-3339-4
[12]	潘爱军, 刘秦玉, 胡瑞金, 等. 北太平洋副热带逆流区海流的准90天振荡[J]. 青岛海洋大学学报, 2002, 32(1): 18−24. Pan Aijun, Liu Qinyu, Hu Ruijin, et al. Quasi 90-day oscillation of the current in the area of subtropical countercurrent in the North Pacific[J]. Journal of Ocean University of Qingdao, 2002, 32(1): 18−24.