Circulation and currents in the southwestern East/Japan Sea: Overview and review     

K.-I. Chang  W.J. Teague  S.J. Lyu  H.T. Perkins  D.-K. Lee  D.R. Watts  Y.-B. Kim  D.A. Mitchell  C.M. Lee  K. Kim 《Progress in Oceanography》2004,61(2-4):105

A review is made of circulation and currents in the southwestern East/Japan Sea (the Ulleung Basin), and the Korea/Tsushima Strait which is a unique conduit for surface inflow into the Ulleung Basin. The review particularly concentrates on describing some preliminary results from recent extensive measurements made after 1996. Mean flow patterns are different in the upstream and downstream regions of the Korea/Tsushima Strait. A high velocity core occurs in the mid-section in the upstream region, and splits into two cores hugging the coasts of Korea and Japan, the downstream region, after passing around Tsushima Island located in the middle of the strait. Four-year mean transport into the East/Japan Sea through the Korea/Tsushima Strait based on submarine cable data calibrated by direct observations is 2.4 Sv (1 Sv = 10⁶ m³ s⁻¹). A wide range of variability occurs for the subtidal transport variation from subinertial (2–10 days) to interannual scales. While the subinertial variability is shown to arise from the atmospheric pressure disturbances, the longer period variation has been poorly understood.Mean upper circulation of the Ulleung Basin is characterized by the northward flowing East Korean Warm Current along the east coast of Korea and its meander eastward after the separation from the coast, the Offshore Branch along the coast of Japan, and the anticyclonic Ulleung Warm Eddy that forms from a meander of the East Korean Warm Current. Continuous acoustic travel-time measurements between June 1999 and June 2001 suggest five quasi-stable upper circulation patterns that persist for about 3–5 months with transitions between successive patterns occurring in a few months or days. Disappearance of the East Korean Warm Current is triggered by merging the Dok Cold Eddy, originating from the pinching-off of the meander trough, with the coastal cold water carried Southward by the North Korean Cold Current. The Ulleung Warm Eddy persisted for about 20 months in the middle of the Ulleung Basin with changes in its position and spatial scale associated with strengthening and weakening of the transport through the Korea/Tsushima Strait. The variability of upper circulation is partly related to the transport variation through the Korea/Tsushima Strait. Movements of the coastal cold water and the instability of the polar front also appear to be important factors affecting the variability.Deep circulation in the Ulleung Basin is primarily cyclonic and commonly consists of one or more cyclonic cells, and an anticyclonic cell centered near Ulleung Island. The cyclonic circulation is conjectured to be driven by a net inflow through the Ulleung Interplain Gap, which serves as a conduit for the exchange of deep waters between the Japan Basin in the northern East Sea and the Ulleung Basin. Deep currents are characterized by a short correlation scale and the predominance of mesoscale variability with periods of 20–40 days. Seasonality of deep currents is indistinct, and the coupling of upper and deep circulation has not been clarified yet.  相似文献   

The Current System in the Yellow and East China Seas   总被引：18，自引：1，他引：18  

Hiroshi Ichikawa  Robert C. Beardsley 《Journal of Oceanography》2002,58(1):77-92

During the 1990s, our knowledge and understanding of the current system in the Yellow and East China Seas have grown significantly due primarily to new technologies for measuring surface currents and making high-resolution three-dimensional numerical model calculations. One of the most important new findings in this decade is direct evidence of the northward current west of Kyushu provided by satellite-tracked surface drifters. In the East China Sea shelf region, these recent studies indicate that in winter the Tsushima Warm Current has a single source, the Kuroshio Branch Current in the west of Kyushu, which transports a mixture of Kuroshio Water and Changjiang River Diluted Water northward. In summer the surface Tsushima Warm Current has multiple sources, i.e., the Taiwan Warm Current, the Kuroshio Branch Current to the north of Taiwan, and the Kuroshio Branch Current west of Kyushu. The summer surface circulation pattern in the East China Sea shelf region changes year-to-year corresponding to interannual variations in Changjiang River discharge. Questions concerning the Yellow Sea Warm Current, the Chinese Coastal Current in the Yellow Sea, the current field southwest of Kyushu, and the deep circulation in the Okinawa Trough remain to be addressed in the next decade. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Effect of Sea Level Variation on Tidal Characteristic Values for the East China Sea     

于宜法  俞聿修  左军成  万振文  陈宗镛 《中国海洋工程》2003,17(3)

1 .IntroductionTheglobalairtemperatureroseabout 0 .5～ 0 .6°Coverthepast 2 0thcentury ,andtheglobalmeansealevelincreasedbyabout2 0cmduringtheperiod .Theregionalmeansealevelriseswiththerisingglobalmeansealevel.Zuoetal.( 1 997)indicatedthatthemeanrisingrateofabsolutemeansealevelalongtheChinacoastontheassumptionofunifiedisostaticdatumis 2mm a .Woodworth( 1 999)analyzedsealevelspanning 1 76 8tothepresentinLiverpool,andobtainedaseculartrendforheperiodupto 1 880of0 .39± 0 .1 7mm a ,andatrendfort…  相似文献   

东海陆架前缘斜坡北部的滑塌带   总被引：1，自引：0，他引：1  

李成钢  范奉鑫  阎军 《海洋科学》2007,31(5):90-92

从1994年对东海陆架前缘斜坡北部实测的8条浅地层记录中,我们发现这些测线上都有滑塌构造,并形成了一条平行于陆架转折线的滑塌带,滑塌带呈NNE向展布,平均宽约7.5km,它们是沉积物流从陆坡上部向下移动的证据。  相似文献   

用模糊集合观点讨论水团的有关概念   总被引：1，自引：0，他引：1  

李凤岐  苏育嵩  王凤钦  喻祖祥 《中国海洋大学学报(自然科学版)》1989,(Z1)

本文将划分水团的基本原则,概括为水团内部特征的相对均一性及其与外部海水的明显差异性。用模糊集合讨论了水型、水团和水系等有关概念。提出了用模糊集合观点定义水团及其核心、本体、边界与混合区的建议,并以1979年8月黄海和东海表层为例,给出了各水团的隶属函数。计算了其核心、本体、边界、混合区及贴近度,按其模糊性排出了顺序。  相似文献   

黄、东海近海面空气湿度分析及估算     

陈永利  杨连素  赵永平  张必成 《海洋科学》1992,16(4):41-44

利用1974～1982年黄、东海海洋水文气象标准断面实测资料对近海面空气湿度的分布、变化进行了分析。讨论了冬、夏季海、气温与湿度的关系,并对冬、夏季近海面空气湿度进行了估算。结果表明,夏季,空气湿度为气温的函数;冬季,除了考虑空气本身平流的水汽外,还必须考虑海洋向大气的水汽输送。  相似文献   

东海沉积物间隙水中硅酸盐和硫酸盐“扩散-平流-反应”模式的研究     

宋金明  李延 《海洋科学》1991,(1)

本文提出了东海沉积物间隙水中溶解硅酸盐和硫酸盐的“扩散-平流-反应”模式。研究结果表明,由于间隙水受到硅酸盐溶解、吸附和沉淀不同体系的控制,因而间隙水中的硅酸盐具有三种不同形式的垂直分布,并从模式中得到了上述反应的反应常数,其中E柱硅溶解的一级动力学反应常数为0.00l 42a~(-1)。首次发现了东海沉积物间隙水中硅酸盐指数下降的垂直分布规律,并从数学模式上进行了处理。本文还研完了由于有机质还原sO_4~(2-)而产生的硫酸盐指数下降垂直分布,提出其模式,结果表明,SO_4~(2-)还原最大速率发生在沉积物-水界面附近,每年可达lmmo1/dm~3。  相似文献   

黄、东海毗邻海域悬浮体与水团的对应关系及影响因素   总被引：2，自引：0，他引：2  

杨作升  郭志刚  王兆祥  徐景平  高文兵 《中国海洋大学学报(自然科学版)》1991,(3)

对黄、东海毗邻海域由陆架到深海的悬浮体进行了大量加密取样,获得了较准确的结果。给出了悬浮体含量及其三维分布,确定它们与水团及其边界有良好的对应关系。并从物源、动力和成因等解释了这种对应,提出了水团对悬浮体研究的重要意义。研究表明黑潮次—中层混合爬升水及其混合水形成悬浮体含量最低值区,横亘在陆架与深海之间,形成阻隔含有大部分悬浮体的陆架中、下层水体向深海输送的洁净“水障”,台湾暖流北上的顶托也起类似作用,并分析了影响悬浮体含量的各种因素及有关机制。  相似文献   

郯庐断裂带的断裂活动对渤海东部中、新生代裂谷盆地发育的控制作用     

李桂群  李学伦 《中国海洋大学学报(自然科学版)》1988,(4)

郯庐断裂带自南而北穿越渤海东部,自中生代中期至新生代中期表现裂谷发育特征。裂谷发育经历两个旋回,各旋回的裂谷发育演化、盆地分布格局,沉积相带,沉积补偿速度等均受断裂带的断裂活动的强烈控制。  相似文献   

红河断裂构造带在东南亚的延伸特征及其大地构造意义     

李桂群  李学伦 《中国海洋大学学报(自然科学版)》1990,(2)

根据地质、地貌及地球物理资料分析,探讨展布于云南边陲哀牢山两侧的北西向断裂组成的红河断裂构造带,在东南亚的延伸特征。提出在该延伸带两侧沉积建造、构造活动,地球物理场和大地构造发展上均有显著差异。并进一步探讨该断裂构造带在大地构造上的意义。  相似文献