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Intermediate currents and midwater plumes in deep-sea mining areas of the Pacific Ocean based on Argo trajectory data
LIU Nuan, XU Dongfeng, YAO Zhixiong, WANG Jun, LIU Zenghong, YANG Chenghao, YANG Haiyan, BAO Hairong
Journal of Marine Sciences ›› 2025, Vol. 43 ›› Issue (3) : 21-31.
PDF(6721 KB)
PDF(6721 KB)
Intermediate currents and midwater plumes in deep-sea mining areas of the Pacific Ocean based on Argo trajectory data
To assess the potential impact of plumes generated by deep-sea mining on the midwater ocean, this study systematically analyzed the flow field characteristics of the intermediate currents at the 1 000 m and 2 000 m in deep-sea mining areas of the Pacific Ocean (Western Pacific: Block C, Block M, Block CW, Block WJ; Eastern Pacific: Block A5, Block KW, Block EK, Block A12678, Block A3, Block A4) and predicted the zonal movement trend of midwater plumes. The analysis was based on the global Argo float trajectory and mid-depth current dataset from the China Argo Real-Time Data Center covering the period from August 1997 to October 2024, combined with data from 3 moored observation stations. The results show that: (1)The currents at the 1 000 m layer in the Pacific mining areas are mainly controlled by zonal currents, with the velocity of eastward jets being greater than that of westward jets. The velocity and direction of currents in the mining areas are sensitive to changes in latitude. (2)The eastward jets that affect the 1 000 m flow field in the Western Pacific mining area have the center located at 14°N (weak) and 18°N (strong). Under their influence, in the southern part of the Block M, the midwater plumes move eastward. In other areas, the midwater plumes move slowly westward.(3) The eastward jets that affect the 1 000 m layer of the Eastern Pacific mining areas have the centers located at 7°N and 9°N. They are stronger in summer and autumn, and weaker in winter and spring. (4)The flow field directional characteristics in the 2 000 m area of Block M, Block A5, Block KW and Block EK are the same as those in the 1 000 m layer, indicating that the depth affected by jets can reach 2 000 m.
Argo trajectory / intermediate circulation / midwater plumes / deep-sea mining / environmental impact assessment
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
周永远, 闫运伟, 邢小罡, 等. 基于Argo实测流场数据对5套海洋模式产品中赤道太平洋中层流的评估[J]. 海洋学研究, 2020, 38(3):1-9.
A preliminary assessment of the Pacific Equatorial Intermediate Currents (EICs) in five ocean models outputs (OFES, LICOM, HYCOM, ECCO2 and SODA) were conducted according to the spatial and temporal features using observation data which was calculated from Argo trajectories. The EICs in Argo currents field are mainly composed of the alternating eastwest zonal jets. In the eastwest direction, the currents are strong in the western but weak in the eastern, in the southnorth direction, the currents are strong in the southern but weak in the northern. Besides, there are seasonal variations and the phase of seasonal variations is characterized by westward propagation and meridionally symmetrical on the equator. The assessment results show that SODA is the best dataset in these five models, all the characteristics are almost consistent with the observation. The second is ECCO2, the flow field is almost consistent with the observation except the kinetic energy. Then comes the OFES, LICOM and HYCOM, all of them are able to simulate the structures of the alternating zonal jets.
|
| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
张冬青, 周春, 赵小龙, 等. 基于Argo浮标的北太平洋中层环流时空特征研究[J]. 中国海洋大学学报:自然科学版, 2023, 53(7):1-9.
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
中国五矿集团有限公司. 中国五矿多金属结核合同区A-5区块采矿车单体试验环境影响声明报告[R]. 北京, 2024.https://www.dosi-project.org/wp-content/uploads/DOSI-Commentary-on-CMC-EIS.pdf.
China Minmetals Corporation. Environmental impact state-ment-testing of polymetallic nodule collector vehicle in the Block A-5 of the minmetals contract area[R]. Beijing, 2024.https://www.dosi-project.org/wp-content/uploads/DOSI-Commentary-on-CMC-EIS.pdf.
|
| [21] |
刘增宏, 张璇, 王辉赞, 等. CSIO全球Argo浮标轨迹和中层流数据集[DS/OL]. 2024.https://data.argo.org.cn/CSIO_Argo/CSIO_Argo.tar.gz.
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
夏一凡, 杜岩, 王天宇, 等. 基于Argo轨迹资料反演热带太平洋中层流场条带状结构特征[J]. 热带海洋学报, 2017, 36(4):1-9.
利用Argo浮标的轨迹资料估算热带太平洋中层纬向流场的条带状结构以及其变化特征。相较于传统温盐地转流算法, 基于Argo轨迹资料的反演算法的优势在于不受零参考面的选取以及赤道地转平衡失效的局限。结果表明: 在赤道太平洋海域, 中层(1000dbar)纬向流场在南北半球都具有条带状分布, 强流分布在赤道附近海域; 在远离赤道海域, 北半球(9°N、13°N、18°N)有相对赤道较弱的东向流动, 而南半球东向流动相对更弱, 没有同北半球一样明显的东向急流。此外, 热带太平洋中层流场的时间变化特征较为复杂: 近赤道流的变化以季节尺度为主, 而远离赤道的流则逐渐演变为多时间尺度下的变化, 海洋Rossby波的调整起到主导作用。
The characteristics and variation of mid-depth zonal jets in the tropical Pacific Ocean are examined using the trajectory of Argo floats. The method to estimate zonal intermediate currents based on Argo trajectory data is more appropriate in the equatorial region because it is free of the restrictions imposed by the methods based on the referenced velocity and Coriolis force. The results indicate that in the equatorial Pacific Ocean, the mid-layer (1000 dbar) zonal jets have a symmetric band-like structure in both Northern and Southern Hemispheres. The strong jets are centered near the equatorial regions, whereas there are several eastward zonal jets in the off-equatorial ocean (9°N, 13°N, 18°N). In addition, the characteristics of temporal variability are relatively complex. In the near-equatorial area, seasonal scale is the major and most important component, while in the off-equatorial region multiple time scale processes dominate. The Rossby wave dynamics and local response probably contribute to this difference. |
| [27] |
|
| [28] |
|
| [29] |
|
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