Flow conditions of the Quaternary Deep-water Current reconstructed by sediment waves in the northeastern South China Sea

被引:1
|
作者
Wang, Xingxing [1 ,2 ]
Sun, Qiliang [1 ]
Wang, Hongbin [3 ]
Yin, Shaoru [4 ]
Wan, Xing [1 ]
Chen, Jie [5 ]
Hernandez-Molina, F. Javier [6 ,7 ]
机构
[1] China Univ Geosci, Hubei Key Lab Marine Geol Resources, Wuhan 430074, Peoples R China
[2] Qingdao Marine Sci & Technol Ctr, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
[3] Minist Nat Resources, Qingdao Inst Marine Geol, Key Lab Gas Hydrate, Qingdao 266071, Peoples R China
[4] Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China
[5] China Univ Petr East China, Sch Geosci, Qingdao 266580, Peoples R China
[6] CSIC, Marine Geosci Div, IACT, Avda Las Palmeras 418100, Armilla, Granada, Spain
[7] UGR, Avda Las Palmeras 418100, Armilla, Granada, Spain
基金
中国国家自然科学基金;
关键词
Sediment waves; Bottom current; Paleoceanography; Luzon Strait; South China Sea; CONTINENTAL-SLOPE; CONTOUR CURRENTS; MESOSCALE EDDY; CIRCULATION; PACIFIC; EVOLUTION; OCEAN; GENERATION; SUBSIDENCE; DEPOSITS;
D O I
10.1016/j.margeo.2024.107414
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The South China Sea (SCS) plays a key role in maintaining the circulation in the Pacific and Indian oceans. After entering the northeast South China Sea from the Luzon Strait, the Pacific Deep Water transforms into the Deep-water Current (DWC) and flows westward. The upwelling of the DWC in the SCS could outflow into both the Indian and Pacific oceans. However, when and how this modern circulation was established in the SCS remains unclear. By using seismic reflection data tied to the Ocean Drilling Program wells in the northeastern SCS margin, we have discovered fields of previously unreported sediment waves, of which the onset dates back to similar to 2.6 Ma. The sediment wave heights increased from 2.0 to 7.5 m, in association with spatial extent from 630 km(2) to 800 km(2) between similar to 2.6 Ma and similar to 0.7 Ma. After that, the wave heights and spatial extent reduced to similar to 5.5 m and 700 km(2), respectively. Considering the location, morphological features and water depth, we propose that these sediment waves were formed by the DWC. The morphological changes of the sediment waves are linked to energy increase and decrease of the DWC within similar to 2.6-0.7 Ma and similar to 0.7-0 Ma, respectively. We interpret the intensification as caused by the narrowing and uplifting of the Luzon Strait that is the sole deep-water gateway of the SCS, and speculate that the post-0.7 Ma weakening was probably related to the reduced Kuroshio Current intrusion due to the middle Pleistocene climate transition. This study proposes a novel model for the evolution of the Quaternary DWC hydrodynamics, fostering our understanding of the paleo-oceanographic links between the SCS and the Pacific Ocean.
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页数:13
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