关于胶莱盆地东南缘基性火山熔岩喷发时代上限的讨论          下载免费PDF全文

赵广涛  曹钦臣  冯叶  李巍然 《海洋科学》1993,17(6):64-66

首次对采自青岛即墨WN部两个深钻孔中新鲜玄武岩样品进行Rb-Sr同位素测年,测定年龄值为65.77±13.6Ma。认为该年龄值代表了胶莱盆地东南缘基性火山熔岩喷发的时代上限,对于整个胶莱盆地中基性火山岩的划分和对比具重要的年代学意义。  相似文献   

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  

杨圣云  丘书院 《台湾海峡》1992,11(3):244-250

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   

厦门筼筜港区环境地震地质的若干问题     

何昭星  姚庆元 《台湾海峡》1990,(2)

本文研究了厦门筼筜港区的工程地质条件与分区特征,讨论了该区环境地质的若干问题。  相似文献   

东白令海的刺黄盖鲽渔场海洋学与渔业生物学特征     

宋云升  陈大刚 《海洋科学》1989,13(1):45-48

本文概述了东白令海形成刺黄盖鲽渔场的海洋学特征,并结合现场调查的标样侧重分析了刺黄盖鲽的渔业生物学特征,本文还概略地讨论了该鱼与渔业资源的关系。  相似文献   

A preliminary analysis of arcuate structures-relationship of the island arc and deep-sea trench to the dip angle of Benioff zone     

Wu Lun  Liang Haihu  Ren Fuhu  Li Maosong 《海洋学报(英文版)》1989,8(1):125-136

The origin of arcuate islands and deep-sea trenches has been studied for a long time and various interpretations have been proposed. In this paper, some analytical models are put forward from a geometrical viewpoint and then the theoretical dip angles of the underthrusting slabs of circum-Pacific island arcs are computed and compared with those of the Benioff zone. As a result, it is found that the dip angle of the underthrusting slab is one of the main factors determining the curvature of the arcuate structure. The authors consider that this result may contribute to the plate theory.  相似文献   

THE DIAGNOSTIC CALCULATION OF EQUATORIAL FLOWS IN THE EASTERN PART OF THE WESTERN PACIFIC OCEAN     

袁耀初  王亚琴 《海洋学报(英文版)》1987,6(1):20-28

On the basis of observational data of the eastern part of the West Pacific Ocean, a diagnostic calculation of equatorial flow for this region is performed by using the authors' model equations and computing scheme and methods. For the first cruise (January 3-March 4, 1979), the results show: (i) The primary driving force of the equatorial surface flows comes from the prevailing northeasterly wind field, with an average uniform wind speed Vw = 6.3 m/s. The steady westward wind produces divergent westward flows in the surface layers, causing an upwelling near the equator. The importance of the steady wind stress in the upper layer (120 m) decreases with depth and becomes insignificant at the level of z = 75 m or z = 100 m, (ii) The equatorial undercurrent is a strong eastward and equator-ward flow, with its eastward component of undercurrent larger than its meridional component. The core of the undercurrent is at the thermocline, and its maximum velocity is 88-90 cm/s at the level of z=200 m. The deeper f  相似文献   

Preliminary Study on Oil Oxidizing Degradation of Hydrocarbon     

周宗澄  倪纯治  李志棠  曾活水  谢锦祥  张南峰 《海洋学报(英文版)》1984,3(2):301-301

The present note describes the microbial degradation of crude oil and hydrocarbons, and discusses the microbial purification of the sea. The study shows that, (1) The ability, of Gram-negative bacteria to degrade crude oil is higher than Gram-positive bacteria. Degradation by Flavobacterium spp. and Xanthomonas spp. is higher than others; (2) The ability of dif-  相似文献   

VARIATIONS OF THE SUMMER MONSOON IN THE SOUTH CHINA SEA     

陶礼文  王晓东 《海洋学报(英文版)》1984,3(3):339-348

In this paper we investigated the variations of summer montoon in the South China Sea. We found that there are two kinds of oscillations in the intensity of the monsoon, one has a period of forty days, the other, fourteen days. We also found that the oscillation of a period of forty days is caused by the alternative extension of the monsoon trough eastward in the South China Sea and the extension of the subtropical anticyclone westward in the West Pacific.It is our opinion that the summer monsoon in the West Pacific and the South China Sea is a system which is independent - of the Indian monsoon and that the dividing line between these two monsoon systems is at the longitude 100°E.  相似文献   

ENSO variability and the eastern tropical Pacific: A review   总被引：3，自引：0，他引：3  

Chunzai Wang  Paul C. Fiedler 《Progress in Oceanography》2006,69(2-4):239

El Niño-Southern Oscillation (ENSO) encompasses variability in both the eastern and western tropical Pacific. During the warm phase of ENSO, the eastern tropical Pacific is characterized by equatorial positive sea surface temperature (SST) and negative sea level pressure (SLP) anomalies, while the western tropical Pacific is marked by off-equatorial negative SST and positive SLP anomalies. Corresponding to this distribution are equatorial westerly wind anomalies in the central Pacific and equatorial easterly wind anomalies in the far western Pacific. Occurrence of ENSO has been explained as either a self-sustained, naturally oscillatory mode of the coupled ocean–atmosphere system or a stable mode triggered by stochastic forcing. Whatever the case, ENSO involves the positive ocean–atmosphere feedback hypothesized by Bjerknes. After an El Niño reaches its mature phase, negative feedbacks are required to terminate growth of the mature El Niño anomalies in the central and eastern Pacific. Four requisite negative feedbacks have been proposed: reflected Kelvin waves at the ocean western boundary, a discharge process due to Sverdrup transport, western Pacific wind-forced Kelvin waves, and anomalous zonal advections. These negative feedbacks may work together for terminating El Niño, with their relative importance being time-dependent.ENSO variability is most pronounced along the equator and the coast of Ecuador and Peru. However, the eastern tropical Pacific also includes a warm pool north of the equator where important variability occurs. Seasonally, ocean advection seems to play an important role for SST variations of the eastern Pacific warm pool. Interannual variability in the eastern Pacific warm pool may be largely due to a direct oceanic connection with the ENSO variability at the equator. Variations in temperature, stratification, insolation, and productivity associated with ENSO have implications for phytoplankton productivity and for fish, birds, and other organisms in the region. Long-term changes in ENSO variability may be occurring and are briefly discussed. This paper is part of a comprehensive review of the oceanography of the eastern tropical Pacific.  相似文献   

海桑属红树植物遗传多样性和引种关系研究   总被引：8，自引：2，他引：8  

周涵韬  林鹏 《海洋学报》2002,24(5):98-106

以海南东寨港红树林自然保护区内无瓣海桑(Sonneratia apetala)、海南海桑(S.hainanensis)、拟海桑(S.paracaseolaris)、杯萼海桑(S.abla)、大叶海桑(S.ovata)、海桑(S.caseolaris)等6种海桑属红树植物为材料,对15个有效引物进行RAPD分析,共扩增出512条带,其中多态性条带为297,占总扩增条带的58.01%.Nei指数法分析和UPGMA统计分析表明,6种海桑属红树植物分为A,B,C3个组,平均遗传距离为0.38.A组包括无瓣海桑、海南海桑、大叶海桑、怀萼海桑,其中无瓣海桑、海南海桑、大叶海桑处于同一个亚组.B组包括拟海桑.C组包括海桑.对海南和福建无瓣海桑种群进行RAPD分析.对Shannon表型多样性指数统计结果表明,福建种群为0.669,海南种群为0.671,各种群遗传变异较大,这与无瓣海桑种群广泛的适应性相一致.对种群间的Shannon表型多样性指数分析表明,种群内的遗传变异占整个遗传变异的93.3%,而种群间的遗传变异仅占6.7%.这表明无瓣海桑种群的大部分遗传变异存在于种群内,而种群间的遗传变异较小.由此可见,无瓣海桑基因组丰富的多样性,是使其由海南成功引种到福建的重要因素.  相似文献