Simulations of Annual Cycle of Phytoplankton Production and the Utilization of Nitrogen in the Yellow Sea     

Tian?TianEmail author  Hao?Wei  Jian?Su  Changsoo?Chung 《Journal of Oceanography》2005,61(2):343-357

A nutrient dynamic model coupled with a 3D physical model has been developed to study the annual cycle of phytoplankton production in the Yellow Sea. The biological model involves interactions between inorganic nitrogen (nitrate and ammonium), phosphate and phytoplankton biomass. The model successfully reproduces the main features of phytoplankton-nutrient variation and dynamics of production. 1. The well-mixed coastal water is characterized by high primary production, as well as high new production. 2. In summer, the convergence of tidal front is an important hydrodynamic process, which contributes to high biomass at frontal areas. 3. The evolution of phytoplankton blooms and thermocline in the central region demonstrate that mixing is a dominant factor to the production in the Yellow Sea. In this simulation, nitrate- and ammonium-based productions are estimated regionally and temporally. The northern Yellow Sea is one of the highly ranked regions in the Yellow Sea for the capability of fixing carbon and nitrogen. The annual averaged f-ratio of 0.37 indicates that regenerated production prevails over the Yellow Sea. The result also shows that phosphate is the major nutrient, limiting phytoplankton growth throughout the year and it can be an indicator to predict the bloom magnitude. Finally, the relative roles of external nutrient sources have been evaluated, and benthic fluxes might play a significant role in compensating 54.6% of new nitrogen for new production consumption.  相似文献   

On the recovery of surface wave by pressure transfer function     

Cheng-Han Tsai  Min-Chih Huang  Fu-Ji Young  Yin-Chern Lin  Hsien-Wen Li 《Ocean Engineering》2005,32(10):4936-1259

Except the commonly selected pressure transfer function derived from the linear wave theory, a previous study on the pressure transfer function for recovering surface wave from underwater pressure transducer suggested that the pressure transfer function is a function of frequency parameter only. With careful analysis, this study showed that the pressure transfer function should include a transducer submergence parameter as that given by the linear theory. It was found that the previously suggested empirical formula should be restricted to measurements with the pressure transducer close to the surface; otherwise overestimation of wave height would result. Field measurements were carried out with an acoustic wave gauge and a synchronized pressure transducer located at various depths with submergence parameter close to 1 (near the sea floor). It was shown that the previous one-parameter empirical formula might overestimate the significant wave height by more than 30%. This study found that with deep-water wave bursts excluded, the transfer function based on the linear wave theory provided a fairly good estimation on the significant wave heights, with an average deviation of 3.6%.  相似文献   

中国鱼类名录Ⅺ--隆头鱼亚目、尤鰧鱼亚目、绵鳚亚目、玉筋鱼亚目     

李明德  田新生  孙凯艳 《海洋通报》2003,22(4):70-76

隆头鱼亚目5科63属316种，鰧鱼亚目8科19属53种，绵鳚亚日3科7属8种，玉筋鱼亚目1科3属3种。  相似文献   

Current status of bacteriological parameters and DOC/POC in Xiamen coastal waters   总被引：2，自引：0，他引：2  

Khalid Maskaoui  Tianling Zheng  Huasheng Hong  Zhiming Yu  Zhong Hu  Yun Tian  Lizhe Cai 《海洋学报(英文版)》2003,22(3):443-451

The surface and bottom waters samples were collected from six locations in Xiamen western sea. The quantified estimation of bacterial production (3H-thymidine method) and observation of bacterial heterotrophic activity (14C-glucose method) have been made in order to have a better understanding of the role of marine bacteria and their activities. The results showed that the mean value of bacterial heterotrophic activity was 9×108 cells/(L.h) in the surface waters and 2.6×108 cells/(L.h) in the bottom waters. The mean value of bacterial production was 38×108 cells/(L.h) in the surface waters and 7.1×108 cells/(L.h) in the bottom waters. The relationship between bacterial production, heterotrophic activity, POC and DOC measured during this survey were discussed. The good understanding of the relationship between bacteria activity and total coliform was addressed.  相似文献   

对应分析在法国Douarnenez海湾拟庸鲽食性研究中的应用(Ⅱ)     

林学群  ChristianDENIEL  AlainLAUREC  FranoiseLEMENN 《海洋科学》1994,18(1):29-32

２．４拟庸蝶食性的对应分析２．４．１观察量和变量的分组观察量（捕食鱼类）依不同季节（冬、夏季）、不同性别（雌雄性）和不同性成熟状态（幼鱼和成鱼）来分组，因此得到８（２３）个观察量。对应分析的变量（饵料）首先根据个体生态的不同分为６个类型：游走多毛类，隐居多毛类，双壳类，不大游动的甲壳类（端足目和等足目），爬行甲壳类（十足国短尾部）和棘皮动物。其他６个类型的饵料生物（类、纽虫类、小型游泳甲壳类、腔肠动物、鱼类及苔藓虫类顺在分组时剔除，其原因为它们的出现可能少了些。考虑到捕食鱼类和饵料双壳类贝壳厚度…  相似文献   

东太平洋地区DSDP573孔始新世末期的微玻璃陨石   总被引：5，自引：1，他引：5  

尹延鸿  万天丰  孙嘉诗 《海洋地质与第四纪地质》2001,21(4):37-42

通过研究 DSDP5 73孔的岩心样品 ,首次在该孔始新世与渐新世的界线地层含金属粘土层中发现了微玻璃陨石 ,且主要富集在其底部。一个样品 (5 g)中最多可达 12粒。这些微玻璃陨石主要呈球形、椭球形。用电子探针测试了其化学成分 ,Si O2 含量为 2 9.6 4%～ 5 8.93%,Al2 O3 为 3.42 %～ 2 0 .96 %,Fe O为 9.98%～ 2 9.5 5 %,Mg O为 4.32 %～ 16 .0 5 %,Ir为 0 .0 6 %～ 0 .81%。总体来说 ,微玻璃陨石的化学成分变化较大 ,可能与靶岩的成分变化较大有关。始新世末期北美微玻璃陨石场的展布方向约为 2 5 0°,这与太平洋板块运动方向改变所需要的矢量变化(2 45°)仅相差 5°,推测很可能是始新世末期陨星的撞击引起了太平洋板块在该时期的运动方向由 NNW突然变为NWW。  相似文献   

麻痹性贝毒PSP在紫贻贝体内的累积、转化与排出   总被引：13，自引：2，他引：13  

颜天  傅萌  李钧  于仁诚  周名江 《海洋与湖沼》2001,32(4):420-427

于1998年9月在青岛鲁迅公园附近礁石区采集紫贻贝（Mytilus edulis)，采用实验室培养的方法，初步研究了塔玛亚历山大藻（Alexandrium tamarense,ATHK)产生的麻痹性贝毒（Paralytic Shellfish Poison,PSP)在其体内累积、转化与排出的规律。结果表明，在累积实验阶段，紫贻贝内脏的和肌肉中的PSP毒素含量均随实验时间的延长而逐渐增加，累积实验结束时，平均每只贝体内的PSP毒素含量为13.40nmol，毒性水平为12.24ugSTXEq/100g，紫贻贝内脏中的毒素含量远远高于肌肉，内脏中PSP毒素占贝体内PSP毒素总量的97.5%。在8天的排出实验阶段，贝体内的PSP毒素总量呈下降趋势，实验结束时，PSP毒素共排除了约50%，每天排除率约为9%。  相似文献   

东海黑潮水与陆架水的季节性输运和交换     

林葵  陈则实  郭炳炎  汤毓祥 《海洋科学进展》1995,(4)

在流星分析和ｔ－Ｓ点聚分析的基础上，在台湾东北部ＩＳ断面和东海中部ＰＮ断面上选取适当的纵剖面作为分界面，将以面分成东、西两侧，计算了界面两侧的海水交换星。结果表明：１．东海陆架区海水交换可归纳为两种类型，即“穿插型”和“进退型”。２．参与分界面处海水交换总量的年平均是夏季最大，春、秋季次之，冬季最小。黑潮水向陆架区输运量为０．５８×１０６ｍ３／ｓ，陆架水向黑潮刚输运量为０．８４×１０６ｍ３／ｓ；参与交换的总量为１．４２×１０６ｍ３／ｓ．３．相对输运量计算结果表明；黑潮水对陆架区水文状况的影响是冬季最强，秋、春季次之，夏季最弱，而陆架水对黑潮区水文状况的影响是夏季最大，秋季次之，春季和冬季最小。  相似文献   

An infinity of conservation laws of fKdV equation     

Xu Zhaoting  Xu Yu  Tian Jiwei 《海洋学报(英文版)》1997,16(1):19-28

An infinity of conservation laws of fKdV equation is derived in terms of the Miura and Gardner''s transform.The pseudo-mass and energy theorems are studied by the first two conservation laws.As a typical example,the theoretical mean wave resistance and the regional distribution of energy of the precursor soliton generation are determined by means of the first and the second conservation laws.  相似文献   

Three-dimensional Layer-integrated Modelling of Estuarine Flows with Flooding and Drying   总被引：1，自引：0，他引：1  

B. Lin  R.A. Falconer 《Estuarine, Coastal and Shelf Science》1997,44(6):737-751

Details are given of the refinement and application of a thee-dimensional (3-D) layer-integrated numerical model of tidal circulation, with the aim of simulating severe tidal conditions for practical engineering applications. The mode splitting strategy has been used in the model. A set of depth-integrated 2-D equations are first solved to give the pressure gradient, and the layer-integrated 3-D equations are then solved to obtain the vertical distributions of the flow velocities. Attention has been given to maintaining consistency of the physical quantities derived from the 2-D and 3-D equations. A TWO=layer mixing length turbulence model for the vertical shear stress distribution has been included in the model. Emphasis has been focused on applying the model to a real estuary, which is geometrically complicated and has large tidal ranges giving rise to extensive flooding and drying. The model has been applied to three examples, including: wind-driven flow in a rectangular lake, tidal circulation in a model rectangular harbour, and tidal circulation in a large estuary. Favourable results have been obtained for both the simple and complex flow beds.  相似文献