Low frequency variation of deep current at Niulang Seamount based on submarine mooring observation

Kuang Fangfang; Zhang Junpeng; Zhou Xiwu; Chen Hangyu; Jing Chunsheng

doi:10.12284/hyxb2022085

Volume 44 Issue 5

Jun. 2022

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Kuang Fangfang，Zhang Junpeng，Zhou Xiwu, et al. Low frequency variation of deep current at Niulang Seamount based on submarine mooring observation[J]. Haiyang Xuebao，2022, 44(5)：71–79 doi: 10.12284/hyxb2022085

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Low frequency variation of deep current at Niulang Seamount based on submarine mooring observation

doi: 10.12284/hyxb2022085

Ocean Dynamic Laboratory, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China

Received Date: 2021-08-18
Rev Recd Date: 2021-11-17

Available Online: 2022-06-17

Publish Date: 2022-06-15

Abstract

Abstract

Based on the long-term observation obtained from two sets of submarine mooring system deployed at Niulang Seamount in the western Pacific, the vertical distribution of the deep currents and the temporal variation characteristics were analyzed in the paper. The results show that: (1) The annual mean ocean currents and the variations were the largest in the upper layer, the second in the middle and deep layers, and the smallest in the middle-deep layers. (2) The subtropical countercurrent was at the depth shallower than 150 m, and the northward current was at depth deeper than 150 m and at the middle layers; the near bottom current was weak southward at the summit of the seamount, but southwestward at the bottom of the seamount. (3) Both at the summit and bottom of the seamount, the currents showed a seasonal oscillation with the most energetic oscillation at a period of about 100 d throughout the water column; at depth above 2 000 m, currents showed a synchronous oscillation in the throughout the water column, with the oscillation amplitude decreasing with depth; current oscillation at deep layers (below 2 000 m) were in opposite phase with that at the upper layers, and the oscillation amplitude was the strongest at 4 000 m.
- Niulang Seamount,
- mooring system,
- deep current,
- low frequency variation

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References(22)

References

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