济州岛南部海区的双跃层现象     

苏育嵩  李凤岐  马鹤来  钱清瑛 《中国海洋大学学报(自然科学版)》1989,(Z1)

本文分析了济州岛南部区域温度双跃层现象的类型及其成因。特别阐明了双跃层的波状现象,指出:强流锋区的侧向效应,黑潮次—中层混合水的爬升,黄海冷水团边缘密度环流引起的侧向流动,以及上、下层流速、流向不一致引起的剪切作用,是导致双跃层波状现象的主要原因。发现上、下跃层之间存在着“跃层间环流”,这是一个有趣的海洋学现象,它将导致双扩散的发生和有利于双跃层的维持。  相似文献   

Morphology, reproduction, ecology and isoenzyme electrophoresis of Capitella complex in Qingdao     

Wu Baoling  Qian Peiyuan  Zhang Songling 《海洋学报(英文版)》1988,7(3):442-458

-Morphology, reproduction, ecology and isoenzyme electrophoresis of a Capitella complex in Qingdao were examined from 1983 to 1984. We determined that the Capitella complex in Qingdao was composed of at least three sibling species: Capitella cf capitata, Capitella sp. I and Capitella sp. IT. Although these three species are very similar in morphology, they differ in: three kinds of isoenzyme electrophoresis, staining reactions, developmental pattern, larval morphology and dispersal, reproductive strategies, breeding season and population ecology. In addition, they show a series of minor quantitative variations in adult morphology, especially in number and morphology of setae. Such differences can be detected only at the population level. Some ecological data such as density, growth rate, mortality and sex distribution are also provided in this paper.  相似文献   

Research on the spectral analysis and test method of period signals in monthly mean sea level     

Ma Jirui  Tian Suzhen  Zheng Wenzhen  Chai Xinmin 《海洋学报(英文版)》1995,14(2):181-190

Ｒｅｓｅａｒｃｈｏｎｔｈｅｓｐｅｃｔｒａｌａｎａｌｙｓｉｓａｎｄｔｅｓｔｍｅｔｈｏｄｏｆｐｅｒｉｏｄｓｉｇｎａｌｓｉｎｍｏｎｔｈｌｙｍｅａｎｓｅａｌｅｖｅｌ￥ＭａＪｉｒｕｉ；ＴｉａｎＳｕｚｈｅｎ；ＺｈｅｎｇＷｅｎｚｈｅｎａｎｄＣｈａｉＸｉｎｍｉｎ（Ｒ...  相似文献   

中华半管藻繁殖生物学研究──Ⅱ.营养细胞和休眼孢子的形态结构     

郑磊  林均民  金德祥 《台湾海峡》1994,(3)

通过扫描电镜观察中华半管藻的营养细胞和休眠孢子的形态结构显示：营养细胞上下壳各具一个线性裂口而不外突的唇形突,壳壁上的眠纹放射状,爪状连接刺上有零散的单孔,从单孔分泌胶质与相邻细胞连接;休眠孢子双凸透镜形或近球形,壳厚,表面平滑无纹饰,上壳面边缘具8～16根分叉长刺,下壳面具微刺,外围有一裙状物,其上有微孔。两类细胞不同的形态特征反映其不同的生态适应。  相似文献   

烟威渔场盐度预报及分析     

郑东  张瑞安 《中国海洋大学学报(自然科学版)》1989,(Z1)

本文以我国北黄海的烟威渔场为研究对象,采用优选因子场预报模式,对盐度的时空变化进行预报试验。文中对所采用的统计预报方法,作了简要介绍。对影响本海区盐度变化的显著因子及预报结果作了初步分析。预报试验表明:预报的总体平均绝对误差为0.27‰,预报相对误差在18％左右,预报误差小于0.5‰的站数占总站数的85％,预报趋势与实测资料基本一致。  相似文献   

Cross-equatorial flow and its effects on the hurricanes occurrence over the Southern Hemisphere     

Qian Ping  Wang Jingyi 《海洋学报(英文版)》1989,8(2):307-313

Channels of cross - equatorial flow and their characteristics Winds at every 5 deg. grid point from 30°E to 180° over the equator at 850 hPa and 200hPa from December 1984 to February 1985 have been separated into U(zonal wind) andV(meridional wind).The V component has been used to represent cross- equatorial flow. FromFig. 1 we obtained that as during the Northern summer,there are also severa1 regions in which  相似文献   

Dynamic Analysis of a Single-Column Platform (II)     

Lian Gan  Ni Kan  Hu Kai Guo Dawei . Professor  Senior Engineer  Marine Design & Research Institute of China  Shanghai . Senior Engineer  Marine Design & REsearch Institute of China  Shanghai . Engineer  Marine Design & Research Institute of China  Shanghai 《中国海洋工程》1992,(4)

This paper describes the study of a single-column structure used as well-head platform. In order to check the reliability of computation theory and programme, model tests have been carried out. The paper introduces the conclusion of tests and the dynamic properties of single-column platform are obtained.  相似文献   

Molecular identification of bloom-forming species Phaeocystis globosa (Pryninesiophyta) and its dispersal based on rDNA ITS sequence analysis     

Chen Yueqin  Shao Peng  Wang Ning  Zhou Hui  Qu Lianghu  Linda K. Medlin 《海洋学报(英文版)》2003,22(2):243-253

The colony-forming Phaeocystis species are causative agents of dense bloom occurrences in coastal waters worldwide. It is difficult to separate them because of the different morphologies associated with their colonial stages. In this study we applied molecular approaches to analyze the genetic variation of Phaeocystis globosa and Phaeocystis pouchetii from several geographic regions, and to assist in tracing the dispersal of bloom-forming Phaeocystis species in coastal waters of China. The sequences of the internal transcribed spacers (ITS1 and ITS2) of rDNA and the 5.8S ribosomal RNA gene of Phaeocystis strains were determined. Sequence comparison shows that P.globosa was the most divergent to P. pouchetii, exhibiting sequence divergence higher than 0.08. However, lower genetic divergences existed between strains of P.globosa. The sequence comparison of the Phaeocystis rDNA ITS clearly shows that the species isolated from the southeast coast of China is identified as P.globosa rather than P. cf. pouchetii or other species. Furthermore, the significance of rDNA variation in distinct global populations of P.globosa suggested it might have had sufficient time to accumulate detectable mutations at the rDNA locus, supporting the hypothesis of ancient dispersal of P.globosa to many areas, meaning that P.globosa blooms in the coastal waters of China are endemic rather than a newly introduced species or a foreign source. Finally, based on the high divergent region of rDNA ITS, a pair of species-specific primers for P.globosa were designed, they could be useful to detect the presence of this species in mixed plankton assemblages or flagellate stages that are recognized with diffculties by means of conventional microscopy.  相似文献   

利用卫星遥感技术监测赤潮的研究   总被引：8，自引：0，他引：8  

丛丕福  赵冬至  曲丽梅 《海洋技术学报》2001,20(4):69-72

赤潮灾害的频繁发生，给海洋生态环境和海洋渔业经济造成了严重危害。卫星遥感技术的不断完善，为快速、有效地动态监测赤潮灾害提供了可能，通过卫星图片的校正、合成、分析、解释、判断分析，可以迅速连续地掌握赤潮的发生状况，对于研究防控和治理赤潮灾害有着十分重要的意义，本文就如何利用卫星遥感技术监测赤潮进行了探讨。  相似文献   

A dipole mode at thermocline layer in the tropical Indian Ocean     

Tian Jiwei  Liu Huiqing  Qian Weihong 《海洋学报(英文版)》2003,22(1):15-24

Temperature data at different layers of the past 45 years were studied and we found adiploe mode in the thermocline layer (DMT): anomalously cold sea temperature off the coast of Sumatra and warm sea temperature in the western Indian Ocean. First, we analyzed the temperature and the temperature anomaly (TA) along the equatorial Indian Ocean in different layers. This shows that stronger cold and warm TA signals appeared at subsurface than at the surface in the tropical Indian O-cean. This result shows that there may be a strong dipole mode pattern in the subsurface tropical Indian Ocean. Secondly we used Empirical Orthogonal Functions (EOF) to analyze the TA at thermocline layer. The first EOF pattern was a dipole mode pattern. Finally we analyzed the correlations between DMT and surface tropical dipole mode (SDM), DMT and Nino 3 SSTA, etc. and these correlations are strong.  相似文献