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1.
南海的季节环流─TOPEX/POSEIDON卫星测高应用研究   总被引:57,自引:8,他引:49       下载免费PDF全文
应用1992~1996年的TOPEX/POSEIDON卫星高度计遥感资料,研究了冬、夏季风强盛期多年平均的南海上层环流结构.研究结果表明,南海上层流结构呈明显的季节变化,在很大程度上受该海区冬、夏交替的季风支配.冬季总环流呈气旋型,并发育有两个次海盆尺度气旋型环流;夏季总环流大致呈反气旋型,但在南海东部18°N以南海域未见明显流系发育.研究还表明,南海环流的西向强化趋势明显,无论冬、夏在中南半岛沿岸和巽他陆架外缘均存在急流,其流向冬、夏相反,是南海上层环流中最强劲的一支.鉴于该海流的动力特征与海洋动力学中定义的漂流不同,有相当大的地转成分,建议称为“南海季风急流(South China Sea Monsoon Jet)”.冬季南下的季风急流在南海南部受巽他陆架阻挡折向东北,沿加里曼丹岛和巴拉望岛外海有较强东北向流发育.夏季北上的季风急流在海南岛东南分为两支北支沿陆架北上,似为传统意义上的南海暖流;南支沿18°N向东横穿南海后折向东北;二者之间(陆架坡折附近)为弱流区.两分支在汕头外海汇合后,南海暖流流速增强.就多年平均而言,黑潮只在冬季侵入南海东北部,并在南海北部诱生一个次海盆尺度的气旋型环流,这时南海暖流只出现在汕头以东海域.夏季南海北部完全受东北向流控制,未见黑潮入侵迹象.用卫星跟踪海面漂流浮标观测进行的对比验证表明,以上遥感分析结果与海上观测一致.  相似文献
2.
Researches on the currents in the South China Sea (SCS) and the interaction between the SCS and its adjacent seas are reviewed. Overall seasonal circulation in the SCS is cyclonic in winter and anticyclonic in summer with a few stable eddies. The seasonal circulation is mostly driven by monsoon winds, and is related to water exchange between the SCS and the East China Sea through the Taiwan Strait, and between the SCS and the Kuroshio through the Luzon Strait. Seasonal characteristics of the South China Sea Warm Current in the northern SCS and the Kuroshio intrusion to the SCS are summarized in terms of the interaction between the SCS and its adjacent seas.  相似文献
3.
南海环流动力机制研究综述   总被引:36,自引:9,他引:27       下载免费PDF全文
南海的环流复杂,但通过近20a来的研究工作,国内外学者对此已取得了不少的成果.本文就南海环流框架性的问题,综述了有关的文献,认为对南海上层海洋三方面的环流分量的驱动机制已有了初步的认识.这三方面分别是:(1)准季节性风场;(2)黑潮向南海的净输运;(3)黑潮向南海的涡度平流输送.但是对这些驱动的时空变化仍相当不清楚.三者皆增强了南海北部的海盆尺度气旋式环流,其强化的西南向西边界流靠近东沙群岛,建议称为“东沙海流”.没有水文证据显示黑潮水是以分支形式进入南海,其向南海的输运也不可能主要通过中尺度涡过程,具体机制有待研究.每年在南海生成的中尺度涡平均约有10个,风场与沿岸地形所生成的强风应力旋度可能是其主要的驱动机制.作为框架性的认识,也有三方面的工作进行得较少,即:(1)吕宋海峡的上层水交换;(2)南海的中尺度涡生成机制,虽然强风应力旋度及前述的第三种环流驱动机制也有中尺度涡伴生;(3)自吕宋海峡进入的深层水对南海上层海洋环流的影响.  相似文献
4.
南海上层水温分布的季节特征   总被引:28,自引:2,他引:26       下载免费PDF全文
为对南海上层水温分布特征有一总体认识,利用气候平均的1°×1°网格的Levitus资料,分析了南海0-200m层共10个等深面上的季平均温度分布状况。结果表明,南海上层水温分布的季节变化明显,季风和太阳辐射对水温分布有显著影响,四季平均水温分布与平均环流状况对应较好。冬、春两季在吕宋岛西北海域有一冷涡(即吕宋冷涡),夏、秋季在越南沿岸出现另一冷涡(即越南冷涡)。这两个冷涡均对应着本海区尺度较小的气旋式环流和正的风应力旋度。吕宋冷涡还与黑潮在吕宋海峡的形变有关,越南冷涡则与局地强上升流有联系。  相似文献
5.
Eutrophication has become an overwhelming phenomenon in the coastal environment off the Changjiang (Yangtze River) Estuary, illustrated by an increase in nutrient concentration, frequent red-tide events and hypoxia in near-bottom waters, while the open East China Sea Shelf and Kuroshio waters remain oligotrophic. Observations made in the Changjiang Estuary and the East China Sea in 1999–2003 cover a broad range of hydrographic and chemical properties. The concentration gradients of nutrients across the shelf indicate that high levels from land-sources are constrained to the coastal and inner-shelf region by the complex circulation regime. In surface waters, nutrient species gradually decrease from eutrophic coastal to oligotrophic open shelf waters, depending on the hydrographic stages of the Changjiang, although biological uptake and regeneration in the upper water column can produce patchy character of nutrient distribution. Taiwan Current Warm Water and Kuroshio Surface Water are devoid of nutrients. Remineralization of nutrient species takes place in the near-bottom waters in the inner-shelf following extensive bacterial demand for organic matter. Hence the burial efficiency is low with regard to the biogenic species, either allochthonous or autochthonous, or both. The Kuroshio Sub-surface Waters are rich in nutrients, and their incursion into the East China Sea can be tracked by salinity and temperature, reaching within water depth of 50–100 m at mid-shelf. Relative to shelf waters, the Kuroshio intrusion is characterized by high and DIP/DOP ratios. In the water column, the ratio of DIP/DOP to is higher than the Redfield P/N value, suggesting rapid regeneration of phosphorus relative to nitrogen in the East China Sea. The results of a box-model suggest that the East China Sea Shelf do likely not export substantial amounts of dissolved biogenic elements to the open Northwest Pacific Ocean.  相似文献
6.
东海黑潮热输送及其与黄淮平原区汛期降水的关系   总被引:22,自引:0,他引:22       下载免费PDF全文
根据日本气象厅1956—1990年PN(G)断面观测资料分析东海黑潮热输送的变异特征,并探讨其冬季热输送与黄淮平原区汛期(6-8月)降水的关系。结果表明,黑潮通过PN(G)断面多年平均的热输送达15.74×1014W,其中冬季热输送的年际和长期变化特别明显;冬季热输送年际变化的周期主要为对.23.4a、3.5a、和2.6a,长期变化总趋势是70年代末以前各年热输送距平均为负值,对年代末接近多年平均值,进入80年代各年距平值不仅为正且逐年增大;东海黑潮冬季热输送与黄淮平原区汛期降水具有相近的长期变化趋势,两者间存在较好的负相关关系。  相似文献
7.
The Current System in the Yellow and East China Seas   总被引:19,自引:1,他引:18  
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
8.
黑潮水入侵东海陆架及陆架环流的若干现象   总被引:18,自引:3,他引:15  
利用WOCE-SVP和中国近海环流观察项目的卫星跟踪表层测流浮标资料,详细分析了黑潮及其入侵东海陆架和东海陆架上层环流的分布状况,结果表明:黑潮从台湾东部进入东海后,明显入侵陆架,并在复杂地形的作用下使其流路呈现多种变化,分析结果还显示,对马暖流不仅仅是黑潮的延续,而是多支流合成的结果,通过资料分析发现:秋节东海黑潮西侧100m等深线处可能存在一支与黑潮反向的逆流,关于它存在的季节变化和动力机制有待进一步的深入研究。  相似文献
9.
Eddy Shedding from the Kuroshio Bend at Luzon Strait   总被引:17,自引:1,他引:16  
TOPEX/POSEDIENT-ERS satellite altimeter data along with the mean state from the Parallel Ocean Climate Model result have been used to investigate the variation of Kuroshio intrusion and eddy shedding at Luzon Strait during 1992–2001. The Kuroshio penetrates into the South China Sea and forms a bend. The Kuroshio bend varies with time, periodically shedding anticyclonic eddies. Criteria of eddy shedding are identified: 1) When the shedding event occurs, there are usually two centers of high Sea Surface Height (SSH) together with negative geostrophic vorticity in the Kuroshio Bend (KB) area. 2) Between the two centers of high SSH there usually exists positive geostrophic vorticity. These criteria have been used to determine the eddy shedding times and locations. The most frequent eddy shedding intervals are 70, 80 and 90 days. In both the winter and summer monsoon period, the most frequent locations are 119.5°E and 120°E, which means that the seasonal variation of eddy shedding location is unclear.  相似文献
10.
南海暖流研究回顾   总被引:17,自引:1,他引:16       下载免费PDF全文
管秉贤 《海洋与湖沼》1998,29(3):322-329
阐述了南海暖流的发现经过,对进一步的观测实验以及形成机制等方面作了回顾,重点是阐述各学者对南海暖流形面机制的看法,并概括出各学者的观点至少存在着4种较大的差异,期望在今后的进一步研究中将会逐步达到一个合理的共识。  相似文献
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