北黄海夏季溶解氧与表观耗氧量年际变化时空模态   总被引：1，自引：0，他引：1       下载免费PDF全文

石强 《应用海洋学学报》2018,37(1):9-25

根据北黄海夏季断面1976~2015年历年8月监测资料,采用时空分析等方法,研究了北黄海夏季断面溶解氧含量和表观耗氧量年际变化时空模态.溶解氧含量与表观耗氧量年际变化分别有3种主要时空模态,第一、二模态是近底层水体低氧、贫氧年际变化的主要影响分量,第三模态是混合层水体高氧、富氧年际变化主要影响分量.生物活性组分(BAC)耗-生氧与海洋环流输送增减氧过程是夏季溶解氧含量与表观耗氧量年际变化主要影响因素,温跃层强度年际变化不是主要影响因素.2001年后,表层月海气氧通量年际变化由氧汇分布为主转变为氧源分布,表层溶解氧含量增大以及生物活性组分生氧作用增强年际变化是这种转变的原因.北黄海夏季断面年平均溶解氧含量、表观耗氧量空间分布相似性较低,夏季断面年平均温度、盐度以及沉积物需氧、风生环流是年平均溶解氧含量、表观耗氧量分布的主要影响因素.生物活性组分耗-生氧过程是断面各层月平均溶解氧含量、表观耗氧量年际变化主要影响因素,温度变化是次要因素.由于断面水体低氧幅度与贫氧面积显著线性增大,与30多年前比较,黄海溶解氧含量、表观耗氧量场季节变化空间分布与时间形态已经发生改变.  相似文献   

沿海港口航道基础地理信息标准体系设计和应用     

洛佳男  万晓霞  邬金  段晶 《地理信息世界》2019,26(1):121-126

信息化海洋测绘生产模式的转变需要地理信息数据标准的支撑。为支持海洋测绘从传统测绘生产模式向网络化、服务化、社会化和智能化的转变,加大海洋测绘地理信息应用广度和深度,以我国沿海交通水域海道测量数据为研究范畴,提出建立沿海港口航道基础地理信息标准体系,从理论上和技术上统一规范化地理信息在数据管理、数据建模、数据表达和数据应用等方面的内容,并进行应用测试。成果表明,建立的标准体系符合国际标准地理信息框架,可满足新型生产模式下从数据采集到最终应用的标准需求,同时也可在我国海洋空间数据基础设施和e-Navigation建设中发挥重要作用。  相似文献   

东海M2分潮模拟中开边界条件的探讨     

程殿忠  颜秀花  蔡榕硕 《台湾海峡》2009,28(4):553-558

基于POM模式,采用第一类水位、流速和Flather（1976）3种开边界条件,模拟了东海的M2分潮．结果表明,在这3种开边界条件下,均能成功地模拟M2分潮的传播特征,以及在该海区内的三个半无潮点．计算结果与实测的较吻合,并且在Flather开边界条件下,模拟的振幅和迟角与实测资料的偏差分别为5．62cm和7．90°,效果最好．这也说明Flather开边界条件是潮汐模拟当中较可取的一种开边界条件．  相似文献   

水文水深数据修正的普里兹湾数字水深模型          下载免费PDF全文

陶怡轩  刘成彦  王召民 《大气科学学报》2021,44(1):128-139

在第一版国际南大洋地图集(the International Bathymetric Chart of the Southern Ocean Version 1.0,IBCSO V1)的基础上,利用现场水文观测中的水深数据重构了普里兹湾及其周围海域的海底地形,建立了更准确的高分辨率数字水深模型。从多套现场水文观测数据中提取了水深观测结果,去除重复剖线后,比较了水文观测中的水深数据与IBCSO V1在500 m×500 m网格上的差异。在保留IBCSO V1中原始多波束、单波束回声测深数据和其他水深观测数据的前提下,使用插值技术修正了无观测数据海域地形。基于大量的海豹观测数据在较大程度上订正了IBCSO V1海床深度。与IBCSO V1海床深度相比,从戴维斯站以东至82°E的南极大陆沿岸、埃默里冰架前缘西部以及西冰架前缘附近区域的海床深度被低估的可能性最大。优化的南极普里兹湾海域水深数字地图改进了对普里兹湾海底地形结构特征的认识。更加准确的地形数据有利于理解海底地形对普里兹湾海洋环流的影响和建立更加可靠的数值模型。  相似文献   

The use of GPS for marine positioning in Germany—requirements,experience, and concepts     

Wolfgang Lechner  Gunther Braun  Harry Wirth 《Marine Geodesy》2013,36(3-4):233-241

Abstract

While beginning to establish a German Civil GPS Information and Observation Service in 1990, the actual and (near) future GPS market in Germany was analyzed. In addition, the feasibility of using GPS for water authority tasks has been studied during past years. Typical capabilities in this area are real‐time positioning for hydrographic surveying (kinematic application) and precise transfer of levels to tide gauges and verification at offshore positions.

The article describes the user interests, the requirements, some of the test campaigns, and the derived concepts for future applications.  相似文献   

APPROACH OF DETERMINISTIC GEOMORPHOLOGIC INSTANTANEOUS UNIT HYDROGRAPH TO HYDROLOGICAL PROCESSES‘ SIMULATION IN KARST AREA     

WANGLa-chun ZHANGJian-xin ZHOUYin-kang CHENXiao-ling DUJin-kang 《中国地理科学(英文版)》2002,12(4):354-358

In order to analyze the condition of special landform and regularity of special hydrological movement inkarst area, the method of Geomorphologic Instantaneous Unit Hydrograph (GIUH) has been used to divide the river net-works into three grades in the research area and the karst hydrologic processes were simulated with Nash instantaneous u-nit hydrograph(NIUH). The combination of the GIUH and NIUH fully considers the moving path of water particles indrainage and the regional composition of runoff at the end of the drainage, resulting in a rational combination of probabili-ty of GIUH and NIUH and geomorphologic parameters which could reflect the complexity of the landform structure ofkarst drainage. The results showed that the combined method of GIUH and NIUH has clear physical concept and accept-able precision, which can be widely applied on hydrological studies of karst area.  相似文献   

The Diatom Nitzschia sicula (Castr.) Hust. and Naupliar Faecal Minipellets in the Adriatic sea     

Damir  Vili&#;&#;  Frano  Kr&#;ini&#; Zlatko  Bi&#;ani&#; 《Marine Ecology》1994,15(1):27-39

Abstract. Nitzschia sicula (C astr .) H ust ., a planktonic pennate diatom, dominated the microphytoplankton (10⁴-5 times 10⁴ cells. 1^-1) in the central, oligotrophic Southern Adriatic Pit waters (20-50m layer) in May 1990. Nauplii dominated the microzooplankton (3 indiv. 1^-1in the 0-50m layer, 130 μm mean body length) and produced a considerable amount of faecal (mini)pellets (1900. 1^-1 at 50m, mean diameter 47μm), which were compactly filled with N. sicula frustules. The subsurface accumulation of diatoms and nauplii was probably the result of both productive activity under specific hydrographic conditions and the convergence in a relatively strong southern Adriatic cyclonic gyre; the advective transport of populations along the shear zone, at the boundary between water masses of different thermo-haline characteristics may also have played a role. The amount of minipellets was high if compared with the data available from other seas. This was probably due to high production of minipellets, their slow sinking rate, and/or an absence of manipulation of the faecal material by zooplankton.  相似文献   

Phytopigments and fatty acids as molecular markers for the quality of near-bottom particulate organic matter in the North Sea     

A.R. Boon  G.C.A. Duineveld 《Journal of Sea Research》1996,35(4):279-291

In February, May and August 1994, four stations in the North Sea (viz. at the Broad Fourteens, Frisian Front, German Bight and Skagerrak) were visited to sample near-bottom particulate organic matter. Samples, taken by means of a pump, a sediment trap and a sediment recorder, were analysed on organic carbon, total nitrogen, phytopigments and fatty acids. These molecular markers were used to describe the nature and quality of the organic particles in the near-bottom water. Principal component analysis showed chlorophyll a, phaeopigments and fatty acids to be useful markers for the quality of organic matter and yield complementary information.The quality of the near-bottom particles appeared to be related to the local hydrography and depositional circumstances. The Broad Fourteens station, a non-depositional sandy site along the Dutch coast, showed organic particles to be relatively fresh, little influenced by resuspended sedimentary material. Near-bottom organic particles on this site contained relatively high shares of chlorophyll a and polyunsaturated fatty acids, characteristic of algal matter. On the other hand the particulate organic material on the two depositional locations, the Frisian Front and the German Bight stations, was influenced by resuspension of sedimentary organic particles poor in pigments and fatty acids. Amounts of carbon trapped in the near-bottom environment at the Skagerrak station were lower than expected from the literature.  相似文献   

秦山核电站邻近水域的基本水文特征   总被引：2，自引：0，他引：2  

许建平  羊天柱 《海洋学研究》1991,9(2):1-15

文章根据1989年4、7、10月和1990年1月在秦山核电站邻近水域获得的水文观测资料,对该区域中海水温度、盐度、浊度、水色和透明度以及潮汐、潮流等要素的分布和变化特征进行了较为详尽的分析,为进一步了解该水域的基本水文状况和海水运动的基本规律提供了重要依据。  相似文献   

Variability in the Hydrographic and Biological Features of the Gulf of Naples   总被引：3，自引：0，他引：3  

Carrada  G.C.  Hopkins  T.S.  Bonaduce  G.  Ianora  A.  Marino  D.  Modigh  M.  Ribera  D'Alcalà M. Scotto  di Carlo B. 《Marine Ecology》1980,1(2):105-120

Abstract. Recent observations of physico-chemical and biological parameters in the Gulf of Naples are summarized. The water masses present within the Gulf during the various periods of the year are described. The temporal and spatial distribution of surface nutrients (N-NO₃, P-PO₄, Si-SiO₄) and chlorophyll a are reported and the areas exposed to local eutrophication are identified. Biweekly sampling at a reference station has permitted us also to identify both phytoplankton and zooplankton seasonal cycles. The morphology of the basin and the uneven land runoff distribution are interpreted as causal to the variability of chemico-physical parameters and of the associated biological communities, giving rise to two subsystems (coastal and "open water") within the Gulf.  相似文献