Distribution, features, and influence factors of the submarine topographic boundaries of the Okinawa Trough

查看全文 作　　者：WU [1,2]ZiYin;LI [1,2]JiaBiao;JIN [1,2]XiangLong;SHANG [1,2]JiHong;LI [1,2]ShouJun;JIN [1,2]XiaoBing

机构地区：[1]Key Lab of Submarine Geosciences,State Oceanic Administration;[2]Second Institute of Oceanography,State Oceanic Administration

出　　处：《Science China Earth Sciences》索引2014年第57卷第8期,共12页

基　　金：supported by Public Science and Technology Research Funds Project of Ocean(Grant No.201105001);Fundamental Project of Science and Technology(Grant No.2013FY112900);National Natural Science Foundation of China(Grant Nos.40506017,41206046) 摘　　要：Based on multiple types of data, the topographical features of the Okinawa Trough(OT) have been characterized and a computation method has been proposed to determine the break point of continental shelf(BOS), foot point of the continental slope(FOS), the central axial point, and the maximum depth point. A total of 48 topographical profiles that crosscut the continental slope have been used to determine the trends of the BOS and FOS(the BOS and FOS lines) in the East China Sea(ECS). The trend of central axial points in the OT has been similarly determined by analyzing 39 topographical profiles across the axis of the trough. The BOS line forms the boundary between the continental shelf and slope. In the ECS, the BOS line roughly follows the 200 m isobath, continuously in the northern and middle parts of the OT, but jumping about somewhat in the south. The FOS line is the boundary between the continental slope and the bottom of the trough. The depth of the FOS increases gradually from north to south in the OT. Intense incisions by canyons into the slope in the southern part of the trough have led to the complex distribution of FOS. Topographical profiles crosscutting the northern, middle, and southern parts of the OT exhibit features that include: a single W-shape, a composite W-shape, and a U-shape, respectively, which suggests that in the middle and northern parts of the trough the central axial points are always located on seamount peaks or ridges associated with linear seamounts, whereas in the south they are found in the center of en echelon depressions. The line formed by the central axial points is the east-west dividing line of the OT, which indicates that the trough is a natural gap that prevents the extension of ECS continental shelf to the east. The distributions of the BOS and FOS lines are influenced by fluctuation of sea levels and submarine canyons, whereas the distribution of axis lines is controlled by tectonics and deposition. 关键词：海底地形冲绳海槽边界影响因素特征低聚果糖海底峡谷中轴线

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Distribution, features, and influence factors of the submarine topographic boundaries of the Okinawa Trough

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