Profile Method for Measuring Apparent Optical Parameters (AOP) Ⅱin Class- Waters     

李铜基  陈清莲 《海洋通报(英文版)》2004,(1)

IntroductionTo acquire marine information by applying the satellite has become a subject of concern to the international remote-sensing community and marine community. Ocean water colour remote-sensing is to detect the content of matter in the water by using the satellite-borne optical sensors, and, among others, the water-leaving radiance is the basic physical quantity in ocean water colour remote sensing and the optical manifestation of the water pigment components. In-situ accurate acquisi…  相似文献   

西沙群岛星虫类研究Ⅲ——石管星虫属Lithacrosiphon     

李凤鲁 《中国海洋大学学报(自然科学版)》1987,(2)

本文连续报道南海西沙群岛星虫类的第三部分即石管星虫属(Lithacrosiphon)。本属系1902年由Shipley氏订立。据文献记载属中的种均分布于热带海,通常钻孔于珊瑚石中。作者仅鉴定了马岛石管星虫(Lithac-rosiphon maldivensis Shipley)一种。本属在中国海是首次记载。  相似文献   

Summer Phytoplankton Physiognomy in Coastal Waters of the Gulf of Naples     

Adriana  Zingone  Marina  Montresor Donato  Marino 《Marine Ecology》1990,11(2):157-172

Abstract. Thirteen sampling cruises were conducted at weekly intervals in the inner part of the Gulf of Naples in the summer of 1983 to investigate the effects of excess nutrient inputs on phytoplankton communities. High surface phytoplankton concentrations (up to 1.15 ×10⁸ cells 1^-1) were recorded, particularly near Naples harbour and along the eastern coast, two locations that receive most of the area's sewage and industrial discharge. Phytoplankton populations were generally dominated by small species, mainly diatoms, which were associated with small phytoflagcllatcs. Species diversity values were relatively high (H'≤ 3.62) in most samples. Throughout the sampling period a high spatial and temporal variability for phytoplankton abundances and species composition was observed.  相似文献   

鲁南沿海沉积物分布规律的研究     

李玉瑛  沈渭铨  章伟 《中国海洋大学学报(自然科学版)》1997,(4)

根据１５００多个表层底质样品分析资料，将本区沉积物分为１２种主要类型，并结合其他资料阐述沉积物分布特点。根据重力取样管，钻孔及浅地层资料，分析研究了沉积物厚度和来源。利用计算所得的沉积物结构参数（ＭＤΦ、ＱＤΦ、ＳＫΦ）分析了沉积环境，探讨了沉积物粒度特征和沉积机理。  相似文献   

Pore Water Nutrient Regeneration in Shallow Coastal Bohai Sea, China   总被引：1，自引：0，他引：1  

Su Mei Liu  Jing Zhang  Wen Sheng Jiang 《Journal of Oceanography》2003,59(3):377-385

The regeneration of pore water nutrients was studied and the contribution of benthic nutrient fluxes to the overlying water was evaluated on the basis of field specific observations conducted in September–October 1998 and April–May 1999 in the Bohai Sea. Nutrient concentrations in sediment pore waters were examined by incubating sediment core samples with overlying seawater in air and/or nitrogen conditions. Nutrient diffusion fluxes calculated by diagenetic equations were within a factor of 2 during incubations. The factors affecting nutrient diffusion across sediment/water interface include bioturbation, nitrification, denitrification, adsorption, and dissolution. The regeneration of nutrients from sediments will increase nutrient loads of the Bohai Sea and affect nutrient atomic ratios in this region. Among nutrient sources from riverine input, atmospheric deposition and sediment regeneration, ammonium and phosphate mainly came from atmospheric deposition (>50%); nitrate was mainly transported by riverine input into the Sea, silicate from sediment regeneration accounts up to 60%. This demonstrates that nutrient regeneration in sediments contributes more silicate than riverine input and atmospheric deposition together, but benthic flux contributes very much less phosphate and nitrate relative to riverine input and atmospheric deposition. The benthic fluxes of nutrients may lead to a decrease of the amount of nitrate, an increase of phosphate, ammonia and silicate in the water column. The release of silicate from sediments may compensate the decrease of silicate due to the reduction of riverine discharge. Nutrient regeneration in sediment may have an important influence on the eutrophic character of coastal waters in this region. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

Study on copper complexing ligand concentrations in several China''s coastal waters     

GONG Haidong  ZHANG Zhengbin  LIU Chunying  LIU Liansheng 《海洋学报(英文版)》2006,25(1):64-77

Copper complexing ligand concentrations in the Daya Bay, Qingdao coast, Jiaozhou Bay, South China Sea and Huanghe Estuary waters were determined by the anodic stripping voltammetry technique. The distribution regularity and the relationship with other parameters were discussed. The results were as follows： Copper complexing ligand concentrations of the South China Sea were a little higher than those of other sea areas, and they were apparently higher than those of the ocean. Compared with the subsurface layer （SSL） in the sea surface microlayer copper complexing ligand concentrations showed an enrichment phenomenon, of which the mechanism is similar to dissolved organic matter. The metal complexing ligand concentration profiles of the South China Sea showed that the value in the sea surface was the highest, then it decreased with depth accruing, and a higher value appeared at the bottom. Copper complex- ing ligand concentrations were higher than those of cadmium and lead. Ligands in each sea area exhibited a complicated property. In short, the distribution regularity of copper complexing ligand concentrations in China＇s coastal waters was consistent with that of other regions in the world. Meanwhile, the positive relationship between the copper complexing ligand concentrations and biological oxygen demand, chemical oxygen demand, dissolved organic carbon, and viscosity were found clearly.  相似文献   

南沙群岛海区秋季浮游植物物种多样性及数量变化   总被引：3，自引：0，他引：3  

李开枝  郭玉洁  尹健强  黄良民 《热带海洋学报》2005,24(3):25-30

根据1997年11月南沙群岛海区的调查资料,对调查海区的浮游植物种类组成、优势种、物种多样性及数量分布特点进行了初步分析。鉴定网采浮游植物共121种,隶属2个门类33属。垂直分层0—75m和75—150m浮游植物细胞数量平均值分别是0.070×104cells·m-3和0.044×104cells·m-3。0—75m层浮游植物细胞数量的高值区出现在调查海区的东部和东南部,最高值出现在安渡滩附近的21号站;75—150m浮游植物细胞数量高值区出现在32号站附近。垂直分布的明显特点是随深度增加浮游植物种类和数量呈减少趋势。三叉角藻Ceratiumtrichoceros和夜光梨甲藻Pyrocystisnoctiluca是0—75m层和75—150m层共有的优势种。0—75m层和75—150m层浮游植物Shannon-Wiener多样性指数平均值分别为3.40和2.07,均匀度平均值分别为0.79和0.60。研究结果表明,秋季浮游植物细胞数量比春、夏季低,浮游植物由硅藻、甲藻组成,甲藻在数量和种类上都占优势。初步探讨了南沙群岛海区秋季浮游植物种类和数量分布与营养盐、温度与盐度、海流及浮游动物等环境因子的关系。  相似文献   

Biomarker responses to pollution in two invertebrate species: Scrobicularia plana and Nereis diversicolor from the Cádiz bay (SW Spain)     

Erkuden Prez  Julian Blasco  Montserrat Sol 《Marine environmental research》2004,58(2-5):275

The clam Scrobicularia plana and the polychaete worm Nereis diversicolor were collected in several sites from a littoral enclosure in SW Spain. The aim of our study was to relate various biomarker responses in these species to a pollution gradient caused by untreated domestic discharges and to verify the adequacy of the selected species as sentinels in this habitat. The biomarkers selected were the antioxidant enzymes catalase (CAT), glutathione peroxidase (GPX) and DT-diaphorase (DT-D). In addition, the activities of cytochrome P450-dependent ethoxyresorufin O-deethylase (EROD) activity, the phase II detoxifying enzyme glutathione S-transferase (GST) and the neurotoxicity marker acetylcholinesterase (AChE) were measured. Metallothionein levels were selected as biomarkers of heavy metals exposure in both species. The results suggest a different response in the water filtering organism (clam) and the sediment eater (polychaete), probably as a consequent of different pollution exposure and that samples from the “Caño Sancti-Petri” were exposed to biologically active compounds that altered some of their biochemical responses. AChE was the most sensitive biomarker in both species and N. diversicolor proved to be a more robust sentinel in this ecosystem.  相似文献   

Three-dimensional hydrodynamic model of Xiamen waters   总被引：3，自引：0，他引：3  

Wen Shenghui  Cai Song  Tang Junjian  Cai Qifu 《海洋学报(英文版)》2003,22(2):151-170

Abstract-A semi-implicit and Eulerian-Lagrangian finite difference method for three-dimensionalshallow flow has been extended to a more complete system of equations incorporating second-momentturbulence closure model and transport equations of salinity and temperature. The simulation for flood-ing and drying of mudflats has been improved. The model is applied to Xiamen waters. Based on exten-sive survey data, water level elevation, temperature and salinity field along the eastern open boundaryand at the Jiulong River inlets and runoffs are analyzed, specified and calibrated. The computed resultsshow good agreement with the measured data, reproduce flooding, emergence of large and complexmudflat region.  相似文献   

The Need for Definitions in Understanding Estuaries   总被引：1，自引：0，他引：1  

M. Elliott  D. S. McLusky 《Estuarine, Coastal and Shelf Science》2002,55(6):815

This paper considers what the definition/classification of estuaries has taught us and why there is a need for classification systems. It further considers why we need to define an estuary and its constituent parts, including the fundamental difficulty and dilemma of trying to define parts of a continuum, as a means to both understanding and managing that estuary. The review considers where an estuary starts and ends and the relative merits of defining estuaries in terms of their biology, physics, chemistry, geographic nature and socio-economic units. It briefly discusses the need for legal and planning definitions and the linkages between science and management. Following this, we present a generic framework for the definition, classification, monitoring, assessment, reporting and management of estuaries. In particular, it is argued that scientists should engage in the debate on the definition of estuaries for legal and socio-economic purposes. It is concluded here that as existing definitions will never be suitable for all needs, a different approach is required. The proposed ‘ Expert Judgement Checklist Approach ’ could provide guidance for those needing to define/delimit an estuary while still acknowledging the inherent variability of such systems. The proposed system mostly relates to the European, temperate estuary, but there are lessons here for estuaries worldwide.  相似文献