Seismic Images of Shallow Waters over the Shatsky Rise in the Northwest Pacific Ocean

Zhang Jinchang1,3,4; Luo Yiming1,3,5; Xing Junhui2,6,7

2021-10-01

10.1007/s11802-021-4581-y

Journal of Ocean University of China   影响因子和分区

1672-5182

1993-5021

Recent studies have demonstrated the ability of seismic oceanography to reveal finescale vertical structures of water column in the oceans based on multichannel seismic (MCS) reflection data. Such information can clarify the dynamic processes of mixing, exchange, and translation of water mass and energy. In this study, we present four MCS lines and satellite data to show high-resolution seismic images of shallow waters over the Shatsky Rise in the Northwest Pacific Ocean, where the Kuroshio Extension passes and bifurcates. One of our MCS transects crossed the center of an anticyclonic warm eddy on August 28, 2010, confirmed by satellite data such as sea level anomaly (SLA), geostrophic current anomaly (GCA), and sea surface temperature anomaly (SSTa). The seismic image showed that the eddy vertical structure featured a bowl-like shape and onion-like internal layering. The slightly tilted (<0.5 degrees) surface of the eddy was 400 m below the sea surface, indicating a subsurface eddy. The eddy was inferred to have a radius of 50 km and a maximum thickness of 500 m. Other MCS sections demonstrated the submesoscale structure of oceanfronts, characterized by the dipping reflectors (> 2 degrees-3 degrees) at the boundaries between water masses with differing properties. In addition, the discrepancies in SLA, GCA, and SSTa between water masses resulted in different seismic reflectivities. The water masses with high SLA, anticyclonic GCA and positive SSTa featured high-amplitude, continuous, clear-layered, and non-linear reflections, whereas those with low SLA, cyclonic GCA, and negative SSTa were associated with weak, fragmented, less stratification, and more linear reflectors.

Kuroshio Extension mesoscale oceanic eddies vertical structure submesoscale structure seismic oceanography multichannel seismic reflection

SCI

英语

其他

National Key R&D Program of China[2018YFC0309800] ; Guangdong Basic and Applied Basic Research Foundation[2021B1515 020098] ; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0205] ; National Natural Science Foundation of China[41776058,41890813] ; Chinese Academy of Sciences["133244KYSB20180029","131551KYSB20 200021","Y4SL021001","QYZDY-SSW-DQC005","ISEE 2019ZR01"] ; Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology[MMRZZ201801]

Oceanography

Oceanography

WOS:000682662400006

OCEAN UNIV CHINA

Web of Science

1.Chinese Acad Sci, Innovat Acad South China Sea Ecol & Environm Engn, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China
4.CAS HEC, China Pakistan Joint Res Ctr Earth Sci, Islamabad 45320, Pakistan
5.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China
6.Ocean Univ China, MOE, Key Lab Submarine Geosci & Prospecting Tech, Qingdao 266100, Peoples R China
7.Ocean Univ China, Coll Marine Geosci, Qingdao 266100, Peoples R China

Zhang Jinchang,Luo Yiming,Xing Junhui. Seismic Images of Shallow Waters over the Shatsky Rise in the Northwest Pacific Ocean[J]. Journal of Ocean University of China,2021,20(5).

Zhang Jinchang,Luo Yiming,&Xing Junhui.(2021).Seismic Images of Shallow Waters over the Shatsky Rise in the Northwest Pacific Ocean.Journal of Ocean University of China,20(5).

Zhang Jinchang,et al."Seismic Images of Shallow Waters over the Shatsky Rise in the Northwest Pacific Ocean".Journal of Ocean University of China 20.5(2021).