浙闽海域冬季悬沙锋的次中尺度现象  

Submesoscale processes of suspended sediment front in Zhejiang-Fujian coastal areas in winter

作　　者：乔璐璐[1,2] 王祥宇 刘世东[1] 郭锦 QIAO Lulu;WANG Xiangyu;LIU Shidong;GUO Jin(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]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》2024年第7期11-21,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”。

摘　　要：次中尺度运动是海洋中重要的动力过程,但是目前对浙闽海域悬沙锋的次中尺度现象及其动力特征的关注较少。本文基于高时空分辨率的GOCI卫星遥感影像、实测表层悬沙浓度数据以及海表涡流数据等,研究了悬沙锋时空分布特征及其次中尺度过程。研究结果表明,浙闽近岸的悬沙锋在冬季普遍发育,主要分布在浙闽海域20~25m等深线附近,但在浙江北部约29°N海域和台湾岛北部26~27°N海域锋面向海突出,指示了近海高浓度悬浮泥沙的向海输运;浙闽悬沙锋次中尺度现象显著,多表现相对涡度的气旋性涡旋;悬沙锋位置逐步向南移动,主要与冬季偏北风产生的西南向沿岸流有关;冬季大风事件有利于锋面次中尺度过程发育。The submesoscale phenomenon is a critical dynamic process in oceanography.Despite its significance,studies detailing the submesoscale dynamics of the suspended sediment front(SSF)in the Zhejiang–Fujian coastal areas are scarce.In this research,high-resolution Geostationary Ocean Color Imager satellite images,with excellent spatial and temporal resolution,and in situ data(surface suspended sediment concentration data and sea surface eddy current data)are used to study the spatial and temporal distributions of SSF and its mesoscale processes.The results revealed that the coastal SSF generally develops in winter,mainly distributed along the 20–25 m isobaths.Significant protruding cross-front sediment transport was observed in the 29°N sea area of northern Zhejiang and the 26°N–27°N sea area of northern Taiwan Island.The submesoscale phenomena in the Zhejiang–Fujian coastal areas are pronounced,mainly characterized by cyclonic vorticity with positive relative vorticity.The SSF moves southward gradually,primarily affected by the southwesterly coastal current generated by northerly winds in winter.Furthermore,winter gale events significantly promote the development of submesoscale processes within the SSF.

关 键 词：次中尺度涡旋 悬沙锋 浙闽近海 大风 冬季 

分 类 号：P736[天文地球—海洋地质]