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利用文献处理工具Bibexcel和网络分析工具Pajek对SCIE和SSCI文献数据库1990—2020年全球海洋生态环境保护文献数据进行统计与可视化分析，以期揭示该领域的科研产出情况、领域知识基础、研究热点分布及前瞻发展态势。研究结果表明：海洋生态环境保护领域文献产出近30年来持续增长；美国、澳大利亚、加拿大、法国等国家在该领域内有着较强的科研竞争力和学术影响力，其中美国处于研究合作核心地位，美国加利福尼亚大学、法国国家科研中心等机构为主要发文机构；海洋生态环境保护研究的热点方向主要为海洋生态环境修复与管控、气候变化、生态系统服务、海洋保护区等；该领域研究学科交融趋势明显，研究者应充分借鉴、吸收其他学科理念和方法，加强海洋生态环境与气候变化、人为活动及生态物种等因素的制衡与协同。 相似文献
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以Web of Science信息平台的SCIE数据库为数据源,利用文献计量方法,分析国际冷泉系统研究的年度变化、期刊分布、主要研究国家、机构的影响力及合作情况以及国际研究热点领域。研究结果发现:国际冷泉系统研究论文产量一直呈增长趋势;美国论文产出数量最多、合作中心性最强。德国亥姆霍兹国家研究中心联合会发文最多。中国近三年发文比例和第一国家发文比例均排名第一,其中发文最多的机构为中国科学院。微生物甲烷厌氧氧化、冷泉区生物多样性以及冷泉碳酸盐岩的矿物学和地球化学是研究热点。 相似文献
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统计了1982-2014年国家海洋局被美国Web of Science核心合集数据库收录的4 466篇SCI科技论文,通过分析SCI论文产出数量和被引次数,了解国家海洋局与全球科研机构合作情况、热点学科分布和国际学术影响力状况。结果显示:国家海洋局的科研合作伙伴遍布全球大约60个国家和地区,1 560所大学和研究机构;在基础研究领域和应用研究领域都取得了许多国内外较高水平的成果;其优势学科向国际前沿延伸的态势较为明显,影响和辐射作用越来越大。这说明以国家海洋局为代表的我国海洋科学学术国际影响力呈现增长的态势。 相似文献
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统计了1982-2014年国家海洋局被美国Web of Science核心合集数据库收录的4466 篇SCI科技论文, 通过分析SCI论文产出数量和被引次数, 了解国家海洋局与全球科研机构合作情况、热点学科分布和国际学术影响力状况。结果显示:国家海洋局的科研合作伙伴遍布全球大约60个国家和地区, 1560所大学和研究机构;在基础研究领域和应用研究领域都取得了许多国内外较高水平的成果;其优势学科向国际前沿延伸的态势较为明显, 影响和辐射作用越来越大。这说明以国家海洋局为代表的我国海洋科学学术国际影响力呈现增长的态势。 相似文献
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红树林与气候变化耦合关系研究既是气候变化领域的研究热点，同时也是红树林领域的研究热点。本研究采用文献计量分析方法对中美红树林与气候变化耦合关系的研究现状和热点进行对比分析，探讨两国在该领域研究特征的异同。研究结果表明：(1)美国作为文献发表数量最高的国家，同样具有最强的学术影响力；中国拥有世界排名第三的发文数量，但在学术影响力方面与美国存在一定的差距。中美两国在该领域的发文量均呈现持续增长的趋势。(2)中美在该领域保持着较强的合作关系，且各自形成了较为广泛的国际合作网络。(3)中美两国的科学家均对气候变化背景下红树林生态系统的脆弱性以及红树林作为基于自然的解决方案在应对气候变化方面起到的作用等问题表现出浓厚的兴趣。但是，由于起步较晚，中国在红树林与气候变化领域相关研究的广度和深度较美国还存在一定的差距，需要进一步扩大国际合作，加强科研产出，提升学术影响力。本研究的相关成果将为我国红树林与气候变化领域的科研工作开展、政策制定及管理实践等提供信息参考。 相似文献
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随着陆地金属矿产资源的日渐枯竭,深海多金属硫化物逐渐成为海洋矿产资源勘探的新趋势。文章介绍了全球主要海底多金属硫化物矿床的成因及分布特点,阐述了多个国际矿业公司和国际海洋组织对西南太平洋、大西洋和印度洋海底块状多金属硫化物勘探活动的最新进展。从海底多金属硫化物的金属品质、深海采矿的法律政策和环境保护等方面对海底多金属硫化物的开发前景进行探讨,并提出积极投身国际海底资源开发规章制定,进一步细化国内法律制度,为深海采矿提供良好的法律制度环境;提升深海治理能力,增强我国在深海领域的话语权;完善深海技术装备体系,提高深海开发创新能力等建议。 相似文献
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文章结合国际深海采矿的现状和中国现有国际海底区域矿区的情况,分析中国国际海底区域矿区采矿存在缺少法律依据、尚未完成矿区资源评价和"区域"放弃、深海采矿技术发展相对滞后、海洋环境影响评估尚有不足等问题;在此基础上提出未来发展建议,即开展与国际海底管理局的深度合作,在制定"区域"内矿产资源开发规章中有所作为;加快对中国国际海底区域的勘探工作,尽快完成矿区资源评价和"区域"放弃;跟踪国际深海采矿行业进展,加快推进中国深海采矿系统的建造并尽快试开采;继续加大深海采矿对海洋环境的影响研究,尽快形成深海采矿环境影响预测评价技术指南。 相似文献
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21世纪是海洋的世纪。为探究进入21世纪后全球在海洋经济方面的研究演进路径和未来可能的研究热点,文章选取Web of Science核心数据库中主题为“Marine Economy”或“Marine Economics”的1 444篇期刊论文,利用Citespace软件分别进行科学合作网络分析、关键词共现分析和文献共被引分析。结果发现：进入21世纪以来,全球对海洋经济研究的关注度普遍提升。①美国、中国和英国构成了海洋经济领域研究的核心力量,但欧美国家之间机构合作较为密切,我国海洋研究机构国内外合作仍需加强,国际影响力仍需进一步提升;②现有海洋经济研究除聚焦渔业管理、海洋经济增长以及相关影响因素问题,还注重生态系统服务、环境保护等可持续性发展的问题;③近年来海洋经济研究相关热点开始转向小规模渔业管理、海洋生态环境保护、海洋产业空间布局和海洋休闲渔业,尤其是小规模渔业管理和海洋生态环境保护,是未来海洋经济研究需要重点关注的方向。 相似文献
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文章用文献计量与科学知识图谱方法呈现海洋药物研究态势与热点,旨在为海洋药物研究提供参考。本文以SCIE(Science Citation Index Expanded)为数据源,以1980～2017年海洋药物领域论文为研究对象,采用文献计量与知识图谱可视化分析方法,结合Excel、VOSviewer软件,对论文年代分布、研究机构、期刊、作者、高被引论文及研究热点进行分析。结果表明,海洋药物研究的热点方向为海洋天然产物、抗菌活性、细胞毒性、海绵等,应重点关注海洋天然产物及其抗菌药理作用的研究。世界范围内关于海洋药物研究的论文数量呈逐年上升趋势,美国在该领域研究占据绝对优势,其发文量、总被引和H指数均占绝对地位。该领域主要发文期刊为《Marine Drugs》、《Journalof Natural Products》。发文机构中中国科学院位列世界第一,但整体论文质量欠佳,中国在该领域研究水平有待加强,论文影响力仍需提高。 相似文献
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Arne Schnack-Friedrichsen Angela M. Davis Jim D. Bennell Dei G. Huws 《Marine Georesources & Geotechnology》2001,19(4):221-243
The interdependence between the seismo-acoustic properties of a marine sediment and its geotechnical/physical parameters has been known for many years, and it has been postulated that this should allow the extraction of geotechnical information from seismic data. Though in the literature many correlations have been published for the surficial layer, there is a lack of information for greater sediment depths. In this article, a desktop study on a synthetic seafloor model illustrates how the application of published near-surface prediction equations to subsurface sediments (up to several tens of meters burial depth) can lead to spurious predictions. To test this further, acoustic and geotechnical properties were measured on a number of sediment core samples, some of which were subjected to loading in acoustically-equipped consolidation cells (oedometers) to simulate greater burial depth conditions. For low effective pressures (representing small burial depths extending to around 10 meters subsurface), the general applicability of established relationships was confirmed: the prediction of porosity, bulk density, and mean grain size from acoustic velocity and impedance appears generally possible for the investigated sedimentary environments. As effective pressure increases through, the observed relationships deviate more and more from the established ones for the near-surface area. For the samples tested in this study, in some instances increasing pressure even resulted in decreasing velocities. There are several possible explanations for this abnormal behavior, including the presence of gas, overconsolidation, or bimodal grain size distribution. The results indicate that an appropriate depth correction must be introduced into the published prediction equations in order to obtain reliable estimates of physical sediment properties for greater subsurface depths. 相似文献
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Shigehisa Nakamura 《Marine Geodesy》2000,23(1):55-61
Specific properties of the interannual sea level variations and annual tides in the Northwestern Pacific were studied. Several tide stations were monitored. The monthly mean sea level for the year of 1995 was analyzed at each tide station. A seismic event in 1995, some tectonic activity around the subject area, and the Kuroshio (the oceanic western boundary current) may possibly contaminate results which would have occurred from the astronomical annual tide alone. 相似文献
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The effect of different fixation and storage protocols on the flow cytometric (FCM) simultaneous analysis of bacterioplankton and phytoplankton in coastal seawater samples (Mediterranean coastal lagoons) was investigated. FCM measurements (cell number, fluorescence and scatter characteristics) were obtained through DAPI staining. Three fixatives [glutaraldehyde (GA), formaldehyde (FA) and paraformaldehyde (PFA)] and two storage (3 months duration) methods (5 °C and −196 °C) were tested. Two dominant populations were detected in studied samples: bacteria and eukaryotic picophytoplankton. Adding fixatives (2% final concentration) appears necessary to obtain FCM exhaustive counts of all the bacteria and phytoplanktonic cells. This was related to the permeation effect of fixatives which allowed a better DAPI staining of the cells. Maximum fluorescence, i.e. optimal staining of the cells was obtained with FA or PFA, and significant lower fluorescences with GA. Fixed samples stored at 5 °C induced rapid cell loss. Only storage in liquid nitrogen of samples fixed with FA or PFA, allows mid-term (≥4 months) preservation of bacteria or picophytoplankton cell numbers, and limited evolution of DAPI-induced fluorescence and scatter characteristics. 相似文献
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《海洋学报(英文版)》2014,(9):F0003-F0003
<正>Acta Oceanologica Sinica(AOS)is a comprehensive academic journal edited by the Editorial Committee of Acta Oceanologica Sinica and is designed to provide a forum for important research papers of the marine scientific community which reflect the information on a worldwide basis.The journal publishes scholarly papers on marine science and technology,including physics,chemistry,biology, 相似文献
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The relationship between the flux of exotic benthic foraminiferal tests (i.e. tests which are supplied from open-sea sources alone) in a tidal inlet and that of bulk sediment was analysed, which can be expressed as two first-order linear equations. According to this relationship, in order to determine net sediment transport directions in the entrance, the test concentration in surficial sediments of the tidal basin can be compared against a ‘ critical level ’. The critical level is determined for the conditions that no net transport of bulk sediment is present within the entrance. If the observed concentration (averaged over the tidal basin) is higher than the simulated critical level, then the net sediment transport is directed to landward. This method is applied to the analysis of net sand transport at Christchurch Harbour, a tidal inlet system located in southern England. In this investigation, concentrations of exotic foraminiferal tests in the surficial sediments of the tidal basin and ebb tidal delta area were obtained from the analysis of sea-bed sediment samples. A series of probable critical levels were calculated based upon the data sets with regard to: (1) sediment discharge from the rivers; (2) magnitude of sediment discharge within the entrance during the ebb; (3) the test concentration outside the harbour; (4) the thickness of the moving layer; and (5) two parameters associated with dispersive processes. The results show that the concentration in the tidal basin sediment is higher than a number of simulated critical concentrations for representative cases. Consequently, the high level of the concentration of exotic benthic foraminiferal tests within the harbour should be explained as a result of landward net transport of sands within the entrance. 相似文献
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Coastal inundation associated with extreme sea levels is the main factor which leads to the loss of life and property whenever a severe tropical cyclonic storm hits the Indian coasts. The Andhra and Orissa coasts are most vulnerable for coastal inundation due to extreme rise in sea levels associated with tropical cyclones. Loss of life may be minimized if extreme sea levels and associated coastal flooding is predicted well in advance. Keeping this in view, location specific coastal inundation models are developed and applied for the Andhra and Orissa coasts of India. Several numerical experiments are carried out using the data of past severe cyclones that struck these regions. The simulated inland inundation distances are found to be in general agreement with the reported flooding. 相似文献
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Hoi-Soo Jung Kap-Sik Jeong Yong-Shik Chu Sung-Hyun Park Ki-Hyune Kim 《Marine Georesources & Geotechnology》2001,19(3):181-195
Grain size and water content in box-core sediments from the Clarion-Clipperton fracture zone (C-C zone) in the northeast equatorial Pacific were analyzed in detail to understand the downcore variations across a hiatus between Quaternary and Tertiary layers. Grain-size distributions in the topmost core sediments show two modes: a coarse mode (peaked at 50 μm) and a fine mode (at 2-25 μm). The coarse mode disappears gradually with depth accompanied by the dissolution of siliceous fossil tests, whereas the fine mode coarsens due to the formation of authigenic minerals. Water content increases abruptly across a color boundary between an upper pale brown layer and a lower dark brown layer that is the hiatus between Quaternary and Tertiary layers. Abundant smectites and microvoid molds, which are created by the prolonged fossil dissolution in the underlying sediment, are attributed for the abrupt downcore variation of water content. Overall variations in grain size and water content in the topmost core sediments in the western C-C zone are possibly constrained by the dissolution of biogenic siliceous fossils. Variations in geotechnical properties related to these changes must be considered in the design of nodule collectors. 相似文献
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Shigehisa Nakamura 《Marine Geodesy》2001,24(1):27-33
This article concerns an interrelation between the sea levels and the western boundary flow near a tectonic boundary in a local zone in the Northwestern Pacific. In this zone, sea level variations at stations located on the coast facing the Pacific are studied to find the interrelation between variations of the Kurosio flow as an index of the distance of the flow axis off a specific coast. The result is discussed after data processing of the monthly means of the sea levels, and a notice is taken of variations caused by active crustal upheavals during a seismic event, a local earthquake. 相似文献