南四湖枝角类九种新记录   总被引：5，自引：0，他引：5  

毛乾盛 《海洋湖沼通报》1991,(2):83-88

笔者多年来对南四湖淡水枝角类进行了系统研究。多次布点采集和定性分析。经鉴定,计有淡水枝角类42种,其中的鹦鹉溞、锯顶低额溞、壳纹船卵溞、发头裸腹溞、纤毛大尾溞、短腹平直溞、侧扁盘肠溞、卵形盘肠溞、驼背盘肠溞等9种,均为南四湖首次发现,本文作了较详细记述。  相似文献   

高效液相色谱法测量青海湖浮游植物色素浓度     

朱建华  伍慧敏  周虹丽  汪小勇 《海洋技术学报》2005,24(2):46-49,54

2003年8月，我们利用高效液相色谱法(HPLC)对浮游植物色素进行分类定量分析。结果表明青海湖的叶绿素类以叶绿素a和b为主，叶绿素a浓度最高；光合作用类胡萝卜素种类极少，浓度很低；光保护色素种类较多，浓度较高，其中以Zea，Diadino，β．β-Car和Viola为主。  相似文献   

Native aluminium (spherules and particles) in the Central Indian Basin sediments: Implications on the occurrence of hydrothermal events     

Sridhar D. Iyer  M.B.L. Mascarenhas-Pereira  B. Nagender Nath 《Marine Geology》2007,240(1-4):177-184

We have sampled particles of native aluminium (Al°) in two sediment cores from the Central Indian Basin (CIB). The cores are geographically separated but are located at the base of two seamounts. The native Al° particles occurring as grains and spherules, have an average Al content of  95% and are associated with volcanogenic–hydrothermal material. Morphologically and compositionally, the specimens are similar to those reported from the East Pacific Rise. After ruling out several processes for the presence of the native Al°, we hypothesize that during progressive melting of magma, a basaltic magma is produced which has high contents of reductants such as methane and hydrogen, and a low oxygen fugacity. During the upward migration of such magma, reduction to metallic aluminium and the formation of native Al° particles takes place.  相似文献   

南四湖湖内浅槽工程施工对水环境的影响及控制措施   总被引：1，自引：0，他引：1  

王茜  王素芳  彭波  邱红  战慧卿 《海洋湖沼通报》2007,(2):80-85

南四湖湖内工程是沂沭泗河洪水东调南下续建工程的单项工程,工程区位于山东省省级自然保护区内;挖泥船施工将对湖内水环境产生一定影响。本文从排泥场回水污染物、生产废水和生活污水三个方面阐述了工程施工对水环境的影响程度,并且提出了相应的控制措施。  相似文献   

REE distribution in water-sediment interface system at deep ocean floor     

Zhang Lijie  Liu Jihu  Yao De 《海洋学报(英文版)》1994,13(4):519-526

ＲＥＥｄｉｓｔｒｉｂｕｔｉｏｎｉｎｗａｔｅｒ－ｓｅｄｉｍｅｎｔｉｎｔｅｒｆａｃｅｓｙｓｔｅｍａｔｄｅｅｐｏｃｅａｎｆｌｏｏｒ￥ＺｈａｎｇＬｉｊｉｅ；ＬｉｕＪｉｈｕａａｎｄＹａｏＤｅ（ＲｅｃｅｉｖｅｄＦｅｂｒｕａｒｙ１，１９９４；ａｃｃｅｐｔｅｄＭａｙ...  相似文献   

The Loyalty—New Hebrides Arc collision: Effects on the Loyalty Ridge and basin system,Southwest Pacific (first results of the ZoNéCo programme)     

Yves Lafoy  Francois Missegue  Dominique Cluzel  Raymond Le Suave 《Marine Geophysical Researches》1996,18(2-4):337-356

The ZoNéCo 1 and 2 cruises of Ifremer's Research Vessel L'Atalante, collected new swath bathymetry and geophysical data over the southern and northern segments of the basins and ridges forming the Loyalty system. Between the two surveyed areas, previous studies found evidence for the resistance of the Loyalty Ridge to subduction beneath the New Hebrides trench near 22°S–169°E. On the subducted plate, except for seismicity related to the downbending of the Australian plate, recorded shallow seismicity is sparse within the Loyalty system (Ridge and Basin) where reliable focal mechanism solutions are almost absent.Swath bathymetry, seismic reflection and magnetic data acquired during the ZoNéCo 1 and 2 cruises revealed a transverse asymmetric morphology in the Loyalty system, and an along-strike horst and graben structure on the discontinuous Loyalty Ridge. South of 23°50S and at 20°S, the two WSW-ENE-trending fault systems, respectively, sinistral and dextral, that crosscut the southern and northern segments of the Loyalty system, are interpreted as due to the early effects of collision with the New Hebrides Arc. A NNW-SSE trend, evident along the whole Loyalty system and on the island of New Caledonia, is interpreted as an inherited structural trend that may have been reactivated through flexure of the Australian lithospheric plate at the subduction zone.Overall then, the morphology, structure and evolution of the southern and northern segments of the Loyalty system probably result from the combined effects of the Australian plate lithospheric bulge, the active Loyalty-New Hebrides collision and the overthrust of the New Caledonian ophiolite.  相似文献   

成山卫沙坝潟湖链的形成和近期演化     

王永红  庄振业  李从先  李学伦 《海洋学报》2001,23(2):86-92

山东荣成市成山头南侧发育了一条沙坝和一系列的湖 ,组成成山卫湖链 ,以面积最大的天鹅湖有关资料为主 ,运用粒度分析、软体动物鉴定、14 C测年等方法 ,对So5 ,Sh5 ,Sh1和Sh6孔岩心进行分析 ,揭示了该湖链的形成过程 :距今 70 0 0a左右 ,海水开始入侵 ,形成了荣成湾 ,距今 6 0 0 0a左右 ,沙坝和坝内的一系列半封闭湖形成 .根据沙坝层理的观测资料分析了湖形成后自然作用下的演化动态 ,并指出近年来由于人类活动加剧 ,严重影响了湖的演化过程  相似文献   

贡湖及其相关水域风生流模拟研究   总被引：9，自引：0，他引：9  

姜加虎 《海洋湖沼通报》1997,(4):1-7

在太湖风生流的数值模拟研究的基础上，设计模拟贡湖及其相关水域风生流的套网格数值模式。应用该模式研究不同风情下，梅梁湖，太湖主体湖水对贡湖的影响。  相似文献   

渤海湾盆地沙河街组钙质超微化石古生态及沉积环境   总被引：3，自引：0，他引：3  

唐祥华 《海洋地质与第四纪地质》1993,13(1):41-45

渤海湾盆地沙河街组中钙质超微化石的发现,表明这一时期渤海湾盆地与海水有过联系。对钙质超微化石古生态及沉积环境研究表明,化石主要产出时代为始新世晚期至渐新世早中期,属“间冰期”亚热带气候型。这一问题的深入研究,对于渤海湾盆地的石油勘探有重要意义。  相似文献   

Mean flow and variability in the southwestern East Sea     

Kyung-Il Chang  Nelson G. Hogg  Moon-Sik Suk  Sang-Kyung Byun  Young-Gyu Kim  Kuh Kim 《Deep Sea Research Part I: Oceanographic Research Papers》2002,49(12)

The Ulleung Basin is one of three deep basins that are contained within the East/Japan Sea. Current meter moorings have been maintained in this basin beginning in 1996. The data from these moorings are used to investigate the mean circulation pattern, variability of deep flows, and volume transports of major water masses in the Ulleung Basin with supporting hydrographic data and help from a high-resolution numerical model. The bottom water within the Ulleung Basin, which must enter through a constricted passage from the north, is found to circulate cyclonically—a pattern that seems prevalent throughout the East Sea. A strong current of about 6 cms⁻¹ on average flows southward over the continental slope off the Korean coast underlying the northward East Korean Warm Current as part of the mean abyssal cyclonic circulation. Volume transports of the northward East Korean Warm Current, and southward flowing East Sea Intermediate Water and East Sea Proper Water are estimated to be 1.4 Sv (1 Sv=10⁻⁶ m³ s⁻¹), 0.8 Sv, and 3.0–4.0 Sv, respectively. Deep flow variability involves a wide range of time scales with no apparent seasonal variations, whereas the deep currents in the northern East Sea are known to be strongly seasonal.  相似文献