秋季东海内陆架悬浮体分布特征  

Distribution characteristics of suspended sediments over the inner shelf of the East China Sea in autumn

作　　者：刘鹏 乔璐璐[1,2] 仲毅[1] 刘世东[1] 薛文静[1] 刘兴民 LIU Peng;QIAO Lu-lu;ZHONG Yi;LIU Shi-dong;XUE Wen-jing;LIU Xing-min(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Lab of Submarine Geosciences and Exploring Technique,Ministry of Education,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中国海洋大学,海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《海洋科学》2022年第1期56-66,共11页Marine Sciences

基　　金：国家自然科学基金(42076179,41476030);亚洲合作资金“长江三角洲与红河三角洲海洋地质环境与地质灾害对比研究”;国家自然科学基金委员会共享航次计划项目(项目批准号:41549902,41649902,41749902)的资助。

摘　　要：秋季是处于夏、冬季之交的过渡季节,夏季风减弱、冬季风增强的背景下海洋水文泥沙环境有独特特征,关于该时期悬浮体分布特征的研究较少。本文基于东海内陆架2016、2017与2018年秋季悬浮体及温盐数据,分析该海域秋季悬浮体浓度的水平和垂向分布特征。结果表明:悬浮体浓度近岸高于远岸,浓度等值线大致平行于等深线,近底层悬浮体浓度较高,特别是舟山群岛及浙闽沿岸河流入海口附近海域,底层悬浮体质量浓度普遍超过20 mg/L。此外,受到地形和台湾暖流东分支控制,在浙江北部(29°N附近)和台湾岛北部(27°N附近)海域存在向外海凸起的高悬浮体浓度舌,部分悬浮体通过跨陆架输运通道运移到124°E以东的东海北部外陆架海域。总体来看,秋季东海内陆架悬浮体浓度主要受入海河流和海洋环流影响,并且在地形和海洋动力作用下存在两个跨陆架输运通道。Autumn is a transitional season between summer and winter with unique ocean hydrodynamics and sediment environment resulting from the weakened summer monsoon and strengthened winter monsoon.However,there are a few studies on the distribution characteristics of suspended sediments in this season.Temperature,salinity,and concentration of suspended sediment data gathered in the East China Sea in the autumn of 2016,2017,and 2018 were used to determine the horizontal and vertical distribution characteristics of suspended sediment concentration over the inner shelf of the East China Sea.Results reveal that the concentration of suspended sediment in the nearshore is higher than that in the offshore area,and the isoline of the suspended sediment concentration is parallel to the isobath line.The concentration of suspended sediment near the bottom layer is relatively high(generally exceeding 20 mg/L),especially near the Zhoushan islands and the estuary of Zhejiang–Fujian coastal rivers.In addition,controlled by the topography and eastern branch of the Taiwan Warm Current,there is a tongue protrusion of suspended sediment concentration in the north of Zhejiang(near 29°N)and Taiwan Island(near 27°N).Some of the suspended sediment is transported to the east of 124°E through the cross-shelf transport channel.The distribution of suspended sediment concentration in the study area is significantly affected by river delivered-sediments and ocean circulation.Moreover,two cross-shelf pathways are induced by hydrodynamic and topography.

关 键 词：东海内陆架 秋季 悬浮体浓度 跨陆架输运 

分 类 号：P736.21[天文地球—海洋地质]