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根据1959—1996年4—6月存在中层冷水的28°～30.5°N,124°E以西海域的温、盐、密度资料,对中层冷水的特征,深度与盐、密度跃层的配置及中层冷水的存在和发展与表层热含量和底层盐含量间的关系进行了分析。指出:中层冷水是存在于密跃层之中,高密度(台湾暖流)水的浮力效应使其叠置于它的上方;在春季,表层热含量和表征台湾暖流的底层盐含量的同步提加,提高了密度跃层的强度,是中层冷水得以维持的重要因素。中层冷水核心的温度与其对应冬季表层温度间的相关分析及三维流场的数值模拟结果揭示,研究海区中层冷水的来源为:(1)当地冬季表层水(南下黄海表层水与东海表层水的混合水)冷却对流;(2)几种水组成的浙闽沿岸水于冬季下沉和向东伸展。 相似文献
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根据实测资料(1986-1990年),分析了热带西太平洋(165°E,10°N～10°S)浮力频率的垂直分布和经向变化,讨论了浮力频率与海水稳定度和海洋内波位能的关系。分析结果表明,赤道海域浮力频率的垂直分布和经向变化具有明显的年际变化。其垂直分布的特点是:浮力频率的垂直变化与位温梯度dθdz的垂直变化相似。在ENSO前期或初期,浮力频率在垂直方向上的极大值达到最大,此时跃层最强,但其厚度最薄;在LaNi na期间,垂直方向的极大值明显小于ENSO前期和初期,此时跃层较厚,跃层强度次之;在ENSO末期,垂直方向上的极值介于上述两者之间。此时跃层厚度最为深厚,跃层强度最弱。浮力频率的经向变化是:在ENSO前期和初期,赤道海域的垂向极大值明显高于赤道外海洋;在LaNi na期间,它明显低于赤道外海洋;而在ENSO末期,则与赤道外海洋无显著差异;在8°N,有一个近乎定常的浮力频率峰值,几乎与ENSO或LaNi na的年际变化无关。 相似文献
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北太平洋150°E～165°E海域柔鱼渔场与表温及水温垂直结构的关系 总被引：6，自引：0，他引：6
根据 1998～ 2 0 0 1年 8～ 10月 38°N～ 4 4°N各站点水温和生产数据 ,对 15 4°E～ 15 7°E海域柔鱼作业渔场与表温及水温垂直结构的关系进行了分析。结果认为 ,38°N～ 4 4°N各站点水温结构随时间有较大差异。 8～ 9月 38°N～ 4 4°N各站点在 10 0m以内均形成明显的温跃层 ,10月份随着亲潮势力加强 ,跃层强度有所减弱 ,表层混合水可达 5 0m深 ,其温跃层基本上在 5 0～10 0m间。在 15 0°E～ 16 5°E海域 ,渔获产量主要集中在 4 2°N～ 4 4°N ,盛渔期为 8～ 9月。 8月在4 0°N～ 4 1°N海域温场最适表温为 2 0～ 2 2℃ ,在 4 2°N - 43°N海域为 16～ 19℃ ,在 4 4°N附近海域为 14～ 16℃ ,0～ 5 0m、0～ 10 0m温度梯度为 0 .16～ 0 .2 3℃ /m和 0 .11～ 0 .13℃ /m ;9月渔场最适表温、0～ 5 0m和 0～ 10 0m温度梯度为 15～ 2 0℃、0 .15～ 0 .18℃ /m和 0 .12～ 0 .14℃ /m ;10月为12～ 17℃、0 .11～ 0 .2 0℃ /m和 0 .0 9～ 0 .11℃ /m。灰色关联度表明 ,对作业渔场影响最大的是表温、0～ 5 0m温度梯度、0～ 10 0m温度梯度和纬度 ,其关联度均在 0 .8以上。渔获产量受到众多因素的影响 ,其中捕捞努力量、资源丰度、0～ 10 0m温度梯度和纬度是影响渔获量主要因子。 相似文献
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1985～1990年的TOGA(热带海洋全球大气)计划,在热带西太平洋(123～165°E,10°N～6°S)进行了综合性多学科的联合调查。本文利用“中-美热带西太平洋联合调查”资料,对热带西太平洋上层水体的叶绿素α和亚硝酸盐的垂直分布进行研究。研究结果表明调查海域上层水体普遍存在叶绿素α最大值(SCM)和第一亚硝酸盐最大值(PNM);它们出现的深度分别在50～150m和75～175m之间,该深度与密度跃层及营养盐跃层密切相关。本文也从分析热带西太平洋上层水体温、盐及生态结构出发,探讨了热带西太平洋SCM和PNM的形成机理。 相似文献
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叶建华 《中国海洋大学学报(自然科学版)》1990,(2)
本文用最大熵方法并结合付氏分析方法分析了黄海中部海区(36°N,124°E)内波调查资料。分析表明该海区存在很强的温度密度跃层。根据对海流资料的分析得出潮汐频率的波动是正压的。从消除了正压潮流后的余流中得到0.049Cph的波动,由温度资料得到频率为0.0514Cph的波动,且发现它基本是斜压的,即为低频内波。该低频波动主要为最低模态朝西方向传播的惯性内波。本文阐明了惯性波的产生来自局地风应力的作用。 相似文献
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近普里兹湾大陆架外水域水文物理特征 总被引：2，自引：0，他引：2
通过１９９０年１２月～１９９１年１月中国＂极地＂号南印度调查资料分析得出如下一些重要结论：（１）８３°Ｅ以西、６４°Ｓ以北海域，南极夏季表层水厚度约２０ｍ，冬季残留水厚度３０～７０ｍ，７０ｍ以下的水层逐渐过渡到南极深层水。南极深层水中心温度最高，为１．８５～２．００℃；８３°Ｅ以东、６４°Ｓ以北海域，０～３０ｍ为南极夏季表层水，５０～１００ｍ层为南极冬季残留水，１００ｍ以下为南极深层水。深层水中心温度普遍降低，最低为１．０４℃，最高为１．４９℃。它表明８３°Ｅ以东区域受陆架水影响更明显。（２）８３°Ｅ以西，６４°Ｓ以南海域，为深水大洋向陆架浅海过渡区域，温度由北向南迅速降低，普里兹湾基本为陆架低温水所盘据；８３°Ｅ以东、６４°Ｓ以南海域主要为西冰架、谢克尔顿冰架低温水，６４°Ｓ附近形成东西方延伸的温、盐锋面。（３）由动力计算知，在８３°Ｅ以西主要为反时针方向环流；８３°～９８°Ｅ中间，６３°Ｓ南北各有一个顺时针环流；９８°Ｅ以东基本为南向流控制。但是，近岸有一顺时针涡旋。（４）８３°Ｅ以西水文锋面主要有夏季表层水锋面；８３°Ｅ以东主要为陆坡区温度锋，是陆架外高温水与陆架低温水之间过渡带。（５）８３°Ｅ是水文 相似文献
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本文由两部分组成:第一部分简要介绍利用我国最新的海陆实测重力数据(范围:O°～55°N,70°～140°E),对目前国际上最新的OSU91A模型进行局部改善的基本原理及主要结果。第二部分进一步将改进后的360阶位模型依频段反演为分层点质量模型,详细介绍了分层解算点质量的Toeplitz矩阵求逆法,并对解算结果进行了外部检核。 相似文献
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台湾海峡地质构造特征 总被引：11，自引：1，他引：11
台湾海峡及其邻区构造可分为３个一级构造单元，即闵浙中生代隆起区、台湾峡新生代坳陷区和台湾新生代岛弧褶断区。其中台湾海峡新生代坳陷区由海峡的主体和台湾西部兵陵平原区组成，它的东、西边界分别是台湾屈尺－老浓断裂带和粤滨外深断裂带。本文在以往海峡西岸东南海海长东－南澳断裂带研究基础上，对近年来台湾海峡、特别是海峡新生代坳陷区各次一级构造单元的深部地质结构，海底地形地貌、沉积特征、断裂构造、火成岩分布和地 相似文献
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This article presents general information on environmental geotechnical problems along the Taiwan Strait Tunnel (TST) route including sea-floor characteristics. The term apparent sea-floor is introduced. This layer is due to land erosion washing down and settling in the Taiwan Strait. The depth of ocean water along the Taiwan Strait is estimated. Various soil, and rock types and marine sediments along the coastline of mainland, Taiwan Strait, and Taiwan Islands are presented. Foundation problems under adverse marine environments are discussed. 相似文献
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《Marine Georesources & Geotechnology》2013,31(3-4):213-226
This article presents general information on environmental geotechnical problems along the Taiwan Strait Tunnel (TST) route including sea-floor characteristics. The term apparent sea-floor is introduced. This layer is due to land erosion washing down and settling in the Taiwan Strait. The depth of ocean water along the Taiwan Strait is estimated. Various soil, and rock types and marine sediments along the coastline of mainland, Taiwan Strait, and Taiwan Islands are presented. Foundation problems under adverse marine environments are discussed. 相似文献
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GPS observation indicates that the Fujian coastal region of China mainland, the region of Taiwan Strait and northern Taiwan island all show a generally homogenous horizontal motion with weak deformation. Historical earthquake record over more than 800 years and modern instrumental data reveal that there is potential seismic risk in and around Taiwan Strait region. After the National Seismic Zoning Map of China (2001) the expected seismic risk in northern part of the Taiwan Strait is lower than that in middle and southern part. The suggested northern route of the Taiwan Strait passage project seems to be relatively save seismically. 相似文献
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《Marine Georesources & Geotechnology》2006,24(3):193-201
GPS observation indicates that the Fujian coastal region of China mainland, the region of Taiwan Strait and northern Taiwan island all show a generally homogenous horizontal motion with weak deformation. Historical earthquake record over more than 800 years and modern instrumental data reveal that there is potential seismic risk in and around Taiwan Strait region. After the National Seismic Zoning Map of China (2001) the expected seismic risk in northern part of the Taiwan Strait is lower than that in middle and southern part. The suggested northern route of the Taiwan Strait passage project seems to be relatively save seismically. 相似文献
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This article discusses the possible socioeconomic impact of Taiwan Strait Tunnel from the perspective of the relationship between the construction of Taiwan Strait Tunnel and the socioeconomic development of the two sides of the Taiwan Strait and the surrounding areas. First of all, the construction of Taiwan Strait Tunnel in its conceptual stage depends on the socioeconomic development of the two sides of the Strait. Important basic conditions—such as the mainland's and Taiwan's future sustainable economic growth above what has already been achieved; their further development of economic, trade, and social ties; their political dialogue based on “the principle of one China”; and the progress of the peaceful reunification of the motherland—will decide the construction of the Taiwan Strait Tunnel. Under such conditions, once the Taiwan Strait Tunnel is operable, it will create a huge demand pull on the two sides of the Taiwan Strait and their surrounding areas for a long period and, thus, will bring about a sustainable increasing economic upsurge in the two sides. Secondly, once the Taiwan Strait Tunnel is open to traffic, its transport ability will be tremendous and will greatly influence the economic development of the two sides of the Strait and enhance their economic and trade ties and their personnel exchange. At the same time, the tunnel will not only form a new traffic pattern of the two sides of the Taiwan Strait, but it will also improve their traffic structure and expand their traffic scale to a large extent. It is certain that the construction of Taiwan Strait Tunnel will be a highly complex project of an all-time grand scale to be constructed over quite a long period. It will encounter a lot more restrictive factors than have ever been met in the fields of design, programming, techniques, equipment, organization of construction, and the operation and maintenance of the tunnel and line. Moreover, it will also encounter many important restrictive factors as a result of its socioeconomic impact. 相似文献
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台湾海峡金色小沙丁鱼幼鱼索饵群体研究 总被引：2，自引：1，他引：2
本文研究了台湾海峡南部和北部的金色小沙丁鱼当年生幼鱼计数性状和量度性状特征差异,并结合其生物学特性、产卵场、洄游及海区环境特征进行综合分析。结果表明,台湾海峡南部和北部的索饵幼鱼仍属于同一地方种群:闽南-台湾浅滩语地方种群。根据其索饵洄游特点,可分为台湾海峡南部和北部两个索饵群体. 相似文献
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INTRODUCTIONIn the late summer Of 1994 (from the end of August to the beginning of September), R/VsOcean Research l, Yanping 2, Ocean Research 3 and XiangWnghong 14 conducted a quasi-simultaneous comprehensive investigation in the southern Taiwan Strait (STS), the northeasternSouth China Sea (SCS) and their adjacent areas, and got CTD data from more than 330 stations.Based on sectional salinity distribution of 10 selected sections, this paper analyses the sectionaldistribution of… 相似文献
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台湾海峡表层沉积物中重矿物特征及其物质来源 总被引：15，自引：0，他引：15
台湾海峡重矿物平均分布0.95%,其分布由西岸向东岸递减;由北部经台湾浅滩朝粤东方向缓慢递减。碎屑矿物46种,以角闪石、绿帘石、磁铁矿、钛铁矿、褐铁矿和片状矿物为主,它们占重矿物含量的67%。据主要重矿物含量将海峡分成8个矿物组合区。碎屑矿物来自海峡两岸基岩,通过河流搬运入海,有部分片状矿物为海峡以北的物质随浙闽沿岸流进入海峡而沉积。其海绿石是台湾西岸、澎湖岛第三系或第四系含海绿石岩层剥蚀后搬运入海沉积而成的。台湾浅滩的残留沉积物为晚更新世低海面时期的河口滨海相沉积物。由于处在开放的海洋环境,至今没有接受现代沉积。残留沉积物中的磁铁矿、钛铁矿、锆石等重矿物相对富集,含量高于近源海域,有可能赋存浅海砂矿。 相似文献
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Currents in the Taiwan Strait as observed by surface drifters 总被引：2，自引：0，他引：2
Yun Qiu Li Li Chen-Tung Arthur Chen Xiaogang Guo Chunsheng Jing 《Journal of Oceanography》2011,67(4):395-404
The trajectories of 110 satellite-tracked surface drifters from 1989 to 2007 were analyzed to elucidate near-surface circulation
in the Taiwan Strait. Although the summer circulation observed generally agrees with previous studies, several aspects of
the winter circulation were revealed by the analyses. Unlike many earlier studies, which have suggested that a northward (southward)
current prevails in the eastern (western) part of the Taiwan Strait during the northeast monsoon season, this study shows
that almost all winter drifters that entered the Taiwan Strait eventually moved southward. Inside the Taiwan Strait, northward
moving tracks can only be found in the Penghu Channel. After passing the Penghu Channel, the drifters were blocked by the
northeast monsoon wind and the Yun-Chang Rise, and turned southward. None of the drifters flowed persistently northward through
the Taiwan Strait in winter. In the southern Taiwan Strait, three typical patterns of circulation were observed for the winter
trajectories—the “throughflow” pattern that enters the South China Sea flowing westward along the slope; the loop current
pattern that circulates anticyclonically and returns to the Kuroshio; and the blocked intrusion pattern that penetrates into
the Taiwan Strait through the Penghu Channel. 相似文献