Preliminary study on different nutrient pools supplies for the phytoplankton growth in the Jiaozhou Bay in China in the fall of 2004     

WANG Dan  SUN Jun  SONG Shuqun  LUAN Qingshan  Joey McMurdie 《海洋学报(英文版)》2007,26(3):110-120

The source and significance of two nutrients, nitrogen and phosphorous, were investigated by a modified dilution method performed on seawater samples from the Jiaozhou Bay, in autumn 2004. This modified dilution method accounted for the phytoplankton growth rate, microzooplankton grazing mortality rate, the internal and external nutrient pools, as well as nutrient supplied through remineralization by microzooplankton. The results indicated that the phytoplankton net growth rate increased in turn from inside the bay, to outside the bay, to in the Xiaogang Harbor. The phytoplankton maximum growth rates and microzooplankton grazing mortality rates were 1.14 and 0.92 d-1 outside the bay, 0.42 and 0.32 d-1 inside the bay and 0.98 and 0.62 d-1 in the harbor respectively. Outside the bay, the remineralized nitrogen (Kr=24.49) had heavy influence on the growth of the phytoplankton. Inside the bay, the remineralized phosphorus(Kr=3.49) strongly affected the phytoplankton growth. In the harbor, the remineralized phosphorus (Kr=3.73) was in larger demand by phytoplankton growth. The results demonstrated that the different nutrients pools supplied for phytoplankton growth were greatly in accordance with the phytoplankton community structure, microzooplankton grazing mortality rates and environmental conditions. It is revealed that nutrient remineralization is much more important for the phytoplankton growth in the Jiaozhou Bay than previously believed.  相似文献   

Recruitment patterns of Serpula vermicularis L. (Polychaeta, Serpulidae) in Loch Creran, Scotland   总被引：1，自引：0，他引：1  

Nicola D. Chapman  Colin G. Moore  Dan B. Harries  Alastair R. Lyndon 《Estuarine, Coastal and Shelf Science》2007,73(3-4):598-606

This study aimed to contribute to conservation management of reefs of Serpula vermicularis by increasing understanding of the factors influencing larval settlement. The study was carried out in Loch Creran, which supports the most extensive known development of S. vermicularis reefs in the world. Settlement plates were deployed to examine the influence of season, depth, reef density, substrate type and orientation. Monthly deployment of plates revealed settlement of S. vermicularis to occur predominantly from mid-June to mid-October, peaking in late August to early September. Settlement of Pomatoceros spp. peaked much earlier, in late May to early June. Deployment of plates at different depths revealed a marked reduction in S. vermicularis settlement intensity between 6 and 12 m. As this corresponds with the deeper limit of the peripheral fringe of serpulid reefs in the loch, it is suggested that this limit is imposed by a depth-correlated settlement response, rather than reduction in available substrata. Comparisons of various substrata showed a preference by S. vermicularis larvae for a slate over a scallop substrate and no evidence of enhanced recruitment to occupied or unoccupied tubes of S. vermicularis, suggesting that gregarious attraction is unlikely to be a factor causing reef formation. Settlement onto the upper side of a horizontal scallop substrate was found to be insignificant in comparison with the underside or a vertically orientated scallop. Evidence for the role of light in controlling the depth and substrate-orientation preferences of S. vermicularis larvae is discussed. Based on the results of this study, recommendations are made regarding remediation of areas suffering reef damage.  相似文献   

The Pechora Sea: Past,recent, and future     

Yu. A. Pavlidis  S. L. Nikiforov  S. A. Ogorodov  G. A. Tarasov 《Oceanology》2007,47(6):865-876

The main stages in the development of the Pechora Sea are discussed. It is established that, during the high sea level stand corresponding to the warmest epoch of the Mikulino Interglacial, the Pechora Sea represented a more spacious, as compared with its present-day size, basin owing to the flooded valleys of river lower reaches. No sea in its present-day configuration existed during the last (Valdai) glaciation. At that time, the sea could have occupied only a narrow area along the southern coast of Novaya Zemlya, where marine sedimentation was in progress during the Late Pleistocene and Holocene. During the glaciation and postglacial time, the dried bottom of the former Pechora Sea accumulated large volumes of sand that are now concentrated largely in the accretion structures along its southern coast. In the current century, changes will occur mainly in the coastal zone of the Russkii Zavorot Peninsula, Pesyakov Island, the Varandei Settlement area, and the Medynskii Zavorot Peninsula, where a shoreline retreat for a distance of 0.5 km is expected.  相似文献   

Supply and precipitation of hydrothermal iron in the rift valley of the Mid-Atlantic Ridge at 26° and 29° N     

V. Yu. Rusakov 《Oceanology》2007,47(2):245-260

This publication considers the probing data on aquatic anomalies (hydrothermal plumes) in the areas of 26° and 29° N of the Mid-Atlantic Ridge (MAR). The mass of the hydrothermal iron supply and the intensity of the iron sedimentation onto the bottom were estimated by means of sediment traps. It was found that the plume of the TAG hydrothermal vent 6 km³ in volume contained about 67 t of suspended Fe; the plume of the Broken Spur field (up to 8.24 km³ in volume) contained 23.5 t or less because of the lower concentration. The data on the sedimentary matter fluxes showed that 0.3–0.5% of the hydrothermal iron was precipitated immediately from a plume of neutral buoyancy onto the bottom; the bulk of the iron was dissipated into the environment. From the dimensions of the plumes, the flow dynamics, the iron concentrations in the plumes, and the amounts of iron supplied by hydrothermal vents, it was found that the resident time of the plumes considered was from 5 to 10 days.  相似文献   

装载GPCTD传感器的海翼水下滑翔机观测数据实时质量控制     

刘增宏  许建平  俞建成 《海洋学报(英文版)》2020,39(3):130-140

Profiles observed by Sea-Wing underwater gliders are widely applied in scientific research. However, the quality control(QC) of these data has received little attention. The mismatch between the temperature probe and conductivity cell response times generates erroneous salinities, especially across a strong thermocline. A sensor drift may occur owing to biofouling and biocide leakage into the conductivity cell when a glider has operated for several months. It is therefore critical to design a mature real-time QC procedure and develop a toolbox for the QC of Sea-Wing glider data. On the basis of temperature and salinity profiles observed by several Sea-Wing gliders each installed with a Sea-Bird Glider Payload CTD sensor, a real-time QC method including a thermal lag correction, Argo-equivalent real-time QC tests, and a simple post-processing procedure is proposed. The method can also be adopted for Petrel gliders.  相似文献   

长江口海水比重的直接测定   总被引：1，自引：0，他引：1  

闵学颐  陈国华  李飞永  于春秀 《海洋学报》1980,2(4):86-92

海水的比重是海水的一个重要物理性质,也是研究海水运动所必需的一个参数。关于大洋海水比重及其与氯度、盐度和电导的关系已有许多报导[3,5-9],为了制定新的国际海洋学常用表,Cox等人对世界各海洋表层海水的比重、盐度和温度的关系又进行了重新研究[3]。他们指出,除去低盐海水以外,所得结果与Knudsen水文表数据吻合较好,但Knudsen水文表的比重数据平均偏低0.006σ_t。  相似文献   

On the vertical structure of temperature anomalies in the North Atlantic     

A. A. Markov  O. I. Braiko  Yu. P. Krasovsky 《Physical Oceanography》1991,2(3):185-189

The expansion of the temperature anomaly field in the North Atlantic is considered using natural orthogonal functions of depth. It is shown that the first few components of this expansion describe the field both at the surface and in the upper 1000 m layer accurately enough. The relation between the water temperature anomaly at some levels and the above components is estimated for various regions of the ocean.Translated by Mikhail M. Trufanov.  相似文献   

Observations and Estimations of Directional Spectrum of Sea Waves   总被引：1，自引：1，他引：1  

Liu Shuxue Yu Yuxiu Assistant Researcher  State Key Laboratory of Coastal  Offshore Engineering  Dalian University of Technology 《中国海洋工程》1995,(1)

The directional spectrum is one of the basic characteristics of sea waves. The observations of directional spectrum of sea waves were successfully conducted at platform Bohai 8 during 1991 and 1992 using a wave gage array for the first time in China. Based on the field data, the directional spectrum which depends on the wave growth is given in this paper. Before observations, the effects of the type of gage array, the distance between the gages and the platform itself on the measured results and the precision of some methods for estimating the directional spectrum were investigated and compared with the methods of numerical simulations and model tests of multi-direcitonal irregular waves. This ensures the quality of the observations and estimations of the directional spectrum.  相似文献   

胶州湾贻贝苗源的发展     

张福绥  楼子康  马江虎  于硕恩  刘祥生  李淑英 《海洋科学集刊》1984,(22):115-126

贻贝(Mytilus edulis L.)是一种冷水性双壳类软体动物，它在我国沿岸分布的南限是胶州湾，但仅见于港内码头及船底上，且数量不多。 1958年青岛市水产局、原青岛市海水养殖场和中国科学院海洋研究所等单位曾一起自大连和烟台移贻贝苗至青岛试养，次年养殖架上也曾有少量幼苗附着，但未能大量繁殖起来。1971年后胶南县海水养殖试验场及青岛市第二海水养殖场等先后进行数十亩乃至数百亩移苗养殖，附苗量虽有所增长，但直至1974年仍缺乏生产意义。这种情况引起我们的思考:胶州湾贻贝苗源能否大量发展？它的限制因素是什么？ 1972年至1973年，我们与烟台地区海水养殖试验场等单位曾对烟台沿岸贻贝苗源进行调查研究，确认当时烟台苗种产量不高的主要原因是附着基不足，其次是亲贝不足，据此试验成功了“废旧草绠采苗法”。之后，随着采苗器材的增加及养殖面积的不断扩大，烟台芝罘湾已发展成为一个较好的苗场，通常可供万亩以上生产用苗。这个经验对我们开发胶州湾的苗源很有启发。 1975年胶南县在胶州湾大力推广“废旧草绠采苗法”，收割海带后保留废旧海带架两万台采贻贝苗， 1976年进一步扩大贻贝养殖面积，继续留绠采苗。我们在青岛市水产局及胶南县水产局等单位的协助下，于1975年9月及1976年8-9月，对胶州湾内及湾口(青岛前海)留绠采苗的情况进行了调查，这些调查资料即为本文的主要依据。  相似文献   

添加维生素B_（12）生产菌高密度培养褶皱臂尾轮虫的效果     

于建平  日野明德 《中国海洋大学学报(自然科学版)》1994,(2)

阐述把维生素Ｂ１２生产菌添加到培养水中培养褶皱臂尾轮虫ＢｒａｃｈｉｏｎｕｓＰｌｉｃａｔｉｌｉｓ的买验。共１８株细菌分离于轮虫培养池，其中，有一株产维生素Ｂ１２的假单胞杆菌ＴＰ４对轮虫的生长繁殖有明显的促进作用。把ＴＰ４菌株培养后，加入到２Ｌ的烧杯和５００Ｌ的水槽中培养泰国Ｓ型轮虫时．在９ｄ（天）和６ｄ（天）中，轮虫密度从１２４～１３９和２４２～２８８个体／ｍｌ增殖到４，４１７～５，５４０和１，０１７～１，２５４个体／ｍｌ，分别比对照组增加了４～６及２～３倍。  相似文献