闽南近海尖头斜齿鲨肝油脂肪酸组成的季节变化     

刘晓春  丘书院 《热带海洋学报》2001,20(3):53-58

闽南近海尖头斜齿鲨Scoliodon sorrakowah肝油的脂肪酸组成中，主要的饱和脂肪酸包括C14：0，C16：0，C18：0；单不饱和脂肪酸包括C16：1，C18：1ω7，C20：1；多不饱和脂肪酸包括C20：4ω6，C20：5ω3，C22：5ω3和C22：6ω3。尖头斜齿鲨肝油总饱和脂肪酸和总单不饱和脂肪酸含量在6月份降至最低值，8-9月升至最高值，总饱和脂肪酸的季节变化规律主要由C16：0决定，总单不饱和脂肪酸的变化主要由C16：1和C18：1ω9决定，总多不饱和脂肪酸含量在6月份达到最高值，8-9用降到最低值，11月份又上升至一定水平，这种变化主要由C22：6ω3决定。  相似文献   

赤潮叉角藻18SrDNA和ITS区序列测定与分析   总被引：20，自引：0，他引：20  

庄丽  陈月琴  李钦亮  屈良鹄 《海洋与湖沼》2001,32(2):148-154

采用PCR及克隆测序的方法，对1998年引发渤海赤潮的叉角藻18SrRNAadldey DNAITS区（Internal Transcribed Spacer Regions)进行了序列测定与分析。并通过因特网从国际分子生物学数据库中获取甲藻另外15个种的18rDNA序列，以Tetrahymena corlissi作为类群，分别采用Neighbor-Joining和Fitch方法构建甲藻较为一致和可靠的进化树图，探讨具有高度多样性和在分类上争议较多的甲藻各类群之间的形态与分子进化关系。结果表明，Prorocentrum(有2个简单的壳板）出现得较早，而大多数多甲藻目（覆盖着多个壳板）、裸甲藻目（大多数不具壳板）和膝沟藻目的成员较晚出现。另外，对叉角藻ITS区的分析表明，ITS区为高变区，是良好的分子标记，可用于叉角藻快速鉴定的专一性核酸分子探针的研制。  相似文献   

莱州湾海湾扇贝养殖区海水中悬浮颗粒的动态变化   总被引：3，自引：0，他引：3  

梁兴明  方建光  崔毅  唐启升 《海洋与湖沼》2001,32(6):635-640

1997年10月和1998年6月，在莱州湾两个主要海湾扇贝养殖区－芙蓉岛海区和金城海区，各定点进行了24h连续观测和取样，并在实验室内分析了总颗粒物（TPM）、颗粒有机物（POM）和叶绿素α的含量。结果表明，6月份金城海区的颗粒有机物和叶绿素α的含量均高于荚蓉岛海区；在10月份，芙蓉岛海区颗粒有机物的含量高于金城海区，但其叶绿素α的含量却低于金城海区，表明金城海区颗粒有机物的质量高于芙蓉岛海区。  相似文献   

用Matlab中的Neural Network Toolbox仿真赤道东太平洋SST的预报模型   总被引：2，自引：0，他引：2  

张韧  蒋国荣  李妍 《海洋科学》2001,25(2):38-42

基于ＮＣＥＰ／ＮＣＡＲ再分析资料和ＣＯＡＤＳ海洋资料中的全球月平均海平面气压场、８５０hPa纬向风场及海洋温度场，利用Ｍatlab中的Ｎeural Network Toolbox仿真环境和ＢＰ模型改进算法比较准确地仿真和反演出了南方涛动指数、赤道纬向风指数和滞后的赤道东太平洋海温之间的动力结构和预报模型。该模型具有很好的拟合精度和可行的预报效果。可在一定时效内预测赤道东太平洋月平均海温的变化趋势。由于所建系统是具有直接因果关系的预报模型，因此不仅可直接用于预测，而且可有效避免类拟非线性微分方程组在积分过程中由于对初值敏感性而可能产生的对预报结果的不确定性。  相似文献   

Treatment of Hydrodynamic Loading for Random Sea State     

Anjan Sarkar  Suhail Ahmad  T. K. Datta M. Tech. Student Assistant Professor 《中国海洋工程》1996,(3)

- In order to employ cost effective frequency domain analysis for off-shore structures treatment of hydrodynamic loading is essential. Drag and inertia dominated, resonating and antiresonating cases under random sea states are analyzed to highlight the implications and relative merits of four salient linearization techniques.  相似文献   

The abyssal bounty fan and lower Bounty Channel: evolution of a rifted-margin sedimentary system     

R. M. Carter  L. Carter 《Marine Geology》1996,130(3-4):181-202

The Bounty Channel and Fan system provides the basis for a model for deep-sea channel and fan development in a rifted continental margin setting. The sedimentary system results from an interplay between tectonics (fan location; sediment source), turbidity currents (sediment supply), geostrophic currents (sediment reworking and distribution) and climate (sea level, and hence sediment supply and type). Today, sediment is shed from the collisional Southern Alps, part of the Pacific/Indo-Australian plate margin, and passes east across the adjacent shelf and into the Otago Fan complex at the head of the Bounty Trough. Paths of sediment supply, and locations of sediment deposition, are controlled by the bathymetry of the Bounty Trough, with axial slopes as high as 37 m/km (2°) towards the trough head, diminishing to around 3.5 m/km (0.2°) along the trough axis. The Bounty Fan is located 800 km further east, where the Bounty Channel debouches onto abyssal oceanic crust at the mouth of the Bounty Trough. The Bounty Fan comprises a basement controlled fan-channel complex with high leveed banks exhibiting fields of mud waves, and a northward-elongated middle fan. Channel-axis gradients diminish from 6 m/km (0.35°) or more on the upper fan to less than 1 m/km (<0.06°) on the lower fan. Parts of the left bank levee and almost the entire middle fan are being eroded and re-entrained within a Deep Western Boundary Current (DWBC), which passes along the eastern New Zealand margin at depths below 2000 m. The DWBC is the prime source of deep, cold water flow into the Pacific Ocean, with a volume of ca. 20 Sv and velocities up to 4 cm/s or greater. The mouth of the Bounty Channel, at a depth of 4950 m at the south end of the middle fan, acts as a point source for an abyssal sediment drift entrained northward under the DWBC at depths below 4300 m. The Bounty Fan probably originated in the early to middle Neogene, but has mostly been built during the last 3 Myr (Plio-Pleistocene), predominantly as climate-controlled sedimentary couplets of terrigenous, micaceous mud (acoustically reflective; glacial) and biopelagic ooze (acoustically transparent; interglacial), deposited under the pervasive influence of the DWBC.  相似文献   

一种新的海洋风场反演中风向模糊排除方法研究     

林明森  郑淑卿 《台湾海峡》1996,15(3):243-254

本文给出了一种从ＳＡＳＳ测量的后向散射强度手数据中反演出大尺度海洋风场的新方法。计算结果与Ｐｅｔｅｈｅｒｙｃｈ等利用ＳＡＳＳ表面风分析的结果比较在风向上是吻合的，在风速上本文所得结果更宇海面赵实风速。上述结果说明本文所采用的多解排除对两波束散射计探测海面风场的反演是成功的。  相似文献   

应用六氯化苯测年法对厦门港现代沉积速率的测定   总被引：2，自引：0，他引：2       下载免费PDF全文

林敏基  李木荣  许永水 《海洋与湖沼》1993,24(3):325-331

岩芯柱样用静力岩芯采样器于1986年采自福建省厦门港一九龙江口海域。通过对这些岩芯柱样中六氯化苯(BHC)的垂直分布状况和生物扰动类型的分析,应用 S_R=D_(BHC-D_(mix)/Y的计算模式,获得了这些岩芯的现代沉积速率数据。将这些数据、方法与原理完全不同的~(210)Pb放射性同位素测年法同岩芯测年数据比较,其结果在数据和数量级上有一定可比性。初步认为,再经进一步探索和改进,BHC测年法有可能应用于近岸河口港湾几十年来现代沉积速率的测定而与其它测年法互为补充。  相似文献   

Distribution of chlorophyll a and diatom in the sea ice of the Weddell Sea, Antarctica     

Chen Xingqun  Gerhard Dieckmann 《海洋学报(英文版)》1991,10(1):161-166

Diatoms are major primary producers of microbial biomass in the Antarctica. They are found in the water and sea ice. The distribution, abundance of the ice diatoms and their relation to the environmental factors inside and outside the ice have been studied for its special role in the Antarctic Ocean ecology. In this paper we describe the abundance, distribution and composition of diatom assemblages in  相似文献   

Spatial and temporal variation of water mass mixing characteristic in the East China Sea     

Miao Yutian  Yu Honghua 《海洋学报(英文版)》1991,10(4):511-523

On the basis of the observation data of Kuroshio since 1984 and relative historical data in the East China Sea, spatial and temporal variation of water mass mixing characteristic in the observation area is analysed. The main results are as follows.  相似文献