南黄海环流的若干特征   总被引：47，自引：7，他引：40  

汤毓祥  邹娥梅  李兴宰  李载学 《海洋学报》2000,22(1):1-16

主要根据近几年来中韩黄海水循环动力学合作调查结果,结合有关历史资料,对南黄海环流的若干特征进行了分析。所得主要认识为:(1)南黄海环流存在明显的季节变异。冬、夏季环流的基本形态有着较大的差别。(2)黄海暖流的路径和强度均有一定的年际变化。分析显示,1997年冬季,暖流路径明显偏于槽的西侧;而1986年冬,暖流的主流路径则沿槽北上。(3)黄海暖流并非对马暖流的直接分支。黄海暖流水是对马暖流水和陆架水混合而成。而且,它主要是在济州岛西侧海域,从锋区中衍生出来的。(4)夏季黄海表、底层环流大致皆是由一大的道时针向流系构成。但在其表层海盐尺度的气旋式环流内部还存在小的气旋和反气旋流环。分析亦表明,不论表层或底层,皆无高盐暖水从济州岛邻近海域进入黄海东部的明显迹象。  相似文献   

海洋资料情报管理软件CMISEL的适应性开发     

刘洪山  许崇金  黄劲峰  邹涛 《海洋通报》2000,19(3):68-73

适应性开发是指保留软件的原有功能,改造或增添一些新功能,以增强软件适应性和灵活性的技术。本文介绍了ＣＭＩＳＥＬ软件包并对其进行解剖分析,根据文件结构、格式和工作需要增加了多个新的功能模块,为软件增添完善了急需之功能,使之适用于当前实际工作的需要。  相似文献   

高电荷态Ar¹⁷⁺离子在表面以下过程中发射X射线分支比及各分支能量的研究     

邹贤容  邵剑雄  陈熙萌  崔莹 《海洋学报》2010,32(9):6064-6070

对低速高电荷态Ar¹⁷⁺离子在与不同金属靶相互作用过程中放出的Ar离子K壳X射线的Kβ/Kα分支比及各分支K线平均能量进行了理论研究.在文献 的基础上,通过对实验数据的分析,得到了0.3—0.8玻尔速度之间的Ar¹⁷⁺离子与Be,Al,Ni,Mo,Au等金属相互作用过程中入射离子发出的X射线分支比及各分支平均能量.理论上,基于导带电子俘获模型和级联跃迁模型,建立耦合方程组,以解释实验主要结果,理论结果与实验符合较  相似文献   

Localisation and phase transition of acoustic waves in a soft medium containing air bubbles     

梁彬  邹欣晔  程建春 《海洋学报(英文版)》2010,29(9)

We study via numerical experiments the localisation property of an acoustic wave in a viscoelastic soft medium containing randomly-distributed air bubbles. The behaviours of the oscillation phases of bubbles are particularly investigated in various cases for distinguishing efficiently the acoustic localisation from the effects of acoustic absorption caused by the viscosity of medium. The numerical results reveal the phenomenon of `phase transition' characterized by an unusual collective oscillation of bubbles, which is an effective criterion to unambiguously identify the acoustic localisation in the presence of viscosity. Within the localisation region, the phenomenon of phase transition persists, and a remarkable decrease in the fluctuation of the oscillation phases of bubbles is observed. The localisation phenomenon will be impaired by the enhancement of the viscosity factors, and the extent to which the acoustic wave is localised may be determined by appropriately analyzing the values of the oscillation phases or the amount of reduction of the phase fluctuation. The results are particularly significant for the practical experiments in an attempt to observe the acoustic localisation in such a medium, which is in general subjected to the interference of the great ambiguity resulting from the effect of acoustic absorption.  相似文献   

枣庄市农村宅基地管理对策研究   总被引：2，自引：2，他引：0       下载免费PDF全文

邹慧  郎静  李琪 《山东国土资源》2009,25(10):7-8

1农村宅基地管理的主要做法（1）枣庄市党委政府重视农民住宅用地问题。该市政府在全市部署开展农村宅基地调查摸底,掌握实情,为市委市政府决策提供依据;同时,在用地指标十分紧张的情况下,从2009年开始对农村宅基地单独下达用地计划,2009年计划下达31.3 hm2,解决农村宅基地问题。市政府要求国土资源部门配合农村住房和危房改造工作,给予用地支持。各区（市）加强组织领导,在政策和财力上支持推进“空心村”治理,一些区（市）分别采取召开现场会等形式进行推广。  相似文献   

Diagnostic investigation of impulsive pressures induced by plunging breakers impinging on gravel beaches     

Adrián Pedrozo-Acuña  Alec Torres-Freyermuth  Qingping Zou  Tian-Jian Hsu  Dominic E. Reeve 《Coastal Engineering》2010

This paper presents an integrated investigation of physical processes generating impulsive pressures under the action of plunging breakers impinging on gravel beaches. This work is an extension of a recent investigation which suggested that wave impacts from plunging breakers acting on gravel beaches may be a key mechanism to enhance sediment mobilisation. In particular, comparisons of full scale laboratory measurements against model results from a well-validated phase/depth-resolving numerical model based on the Reynolds–Averaged Navier–Stokes (RANS) equations are presented. This represents the first attempt at comparison with such a tool against observed hydrodynamics on steep (slope~1/8) gravel beaches at prototype scale. In order to understand how impulsive pressures are generated under plunging waves, the numerical model is used to carry out a detailed investigation to examine the role of each of the acceleration terms in the momentum balance. Consistent with prior studies, numerical results show that under plunging breakers the local acceleration (∂u/∂t) alone cannot be used as a proxy for pressure gradients. However, the contribution of the third term (w∂u/∂z) of total acceleration is recognized for the first time and indicates that this term has an important role in both the induced pressure gradient and sediment mobilisation as induced by this particular type of breaking. Furthermore, results suggest that a parameterisation of the pressure gradient in terms of ∂u/∂t+u∂u/∂x, may not suffice when dealing with plunging breakers and hence there is a lack of a suitable parameterisation of this process in the present literature. Thus, for different types of breaking it may be necessary to consider a different characterisation of the pressure gradient toward the parameterisation of sediment transport inside the surf zone.  相似文献   

The THU-NAOC transient survey: the performance and results from the first year     

Tian-Meng Zhang  Xiao-Feng Wang  Jun-Cheng Chen  Ju-Jia Zhang  Li Zhou  Wen-Xiong Li  Qing Liu  Jun Mo  Kai-Cheng Zhang  Xin-Yu Yao  Xu-Lin Zhao  Xu Zhou  Jun-Dan Nie  Fang Huang  Zhao-Ji Jiang  Jun Ma  Ling-Zhi Wang  Chao Wu  Zhi-Min Zhou  Hu Zou  Li-Fan Wang 《天文和天体物理学研究(英文版)》2015,(2):215-224

The Tsinghua University-National Astronomical Observatories, Chinese Academy of Sciences(NAOC) Transient Survey is an automatic survey that conducts a systematic exploration of optical transients. This project utilizes a 60/90 cm Schmidt telescope at the Xinglong Station of NAOC. This survey repeatedly covers ～ 1000 square degrees of the northern sky with a cadence of 3–4 d. With an exposure of 60 s,the survey reaches a limiting unfiltered magnitude of about 19.5 mag, which enables us to discover supernovae in their relatively young stages. We describe the overall performance of our survey during the first year and present some preliminary results.  相似文献   

Sources, pathways and sinks of particulate organic matter in Hudson Bay: Evidence from lignin distributions   总被引：1，自引：0，他引：1  

Zou Zou A. Kuzyk  Miguel A. Goi  Gary A. Stern  Robie W. Macdonald 《Marine Chemistry》2008,112(3-4):215-229

Hudson Bay is a large, estuarine, shelf-like sea at the southern margin of the Arctic, where changes in seasonal ice cover and river discharge appear already to be underway. Here we present lignin data for dated sediments from eleven box cores and evaluate sources of terrigenous carbon, transport pathways, and whether terrigenous organic matter has been influenced by recent environmental change. Lignin yields (0.04 to 1.46 mg/100 mg organic carbon) decreased from the margin to the interior and from south to north, broadly reflecting the distribution of river inputs. Lignin compositional patterns indicated distinct regional sources with boreal forest (woody gymnosperm) vegetation an important source in the south, vs. tundra (non-woody angiosperm) in the north. Lignin patterns suggest redistribution of a fine-grained, mineral-associated fraction of the southern-derived terrigenous carbon to the northeast part of the Bay and ultimately into west Hudson Strait with the Bay's cyclonic coastal circulation. A small component of the carbon makes it to the central basins of Hudson Bay but most of the terrigenous organic material in that area appears to derive from resuspension of older, isostatically-rebounding coastal and inner shelf deposits. Most modern plant debris appears to be retained near river mouths due to hydrodynamic sorting, with the exception of the southwest inner shelf, where these materials extend > 30 km from shore. Temporal changes in the composition of terrigenous organic carbon recorded in most of the southern Hudson Bay cores perhaps reflect increases in erosion and cross-shelf transport from coastal deposits, possibly mediated by change in ice climate. In contrast, temporal changes in the northwest may relate to changes in the supply of modern plant debris under recent warmer conditions. On the western shelf, changes may relate to ice climate and the distribution of northern coastal water and/or changes in the delivery of materials by the Churchill River due to water diversion. Although the cores show evidence of change related to the ice climate, there is little evidence that ice itself transports terrigenous organic carbon within the system.  相似文献   

Vaccination in three different ways against vibriosis of <Emphasis Type="Italic">Seriola dumerili</Emphasis> caused by <Emphasis Type="Italic">Vibrio hollisae</Emphasis>     

纪荣兴  邹文政  胡石柳  鄢庆枇 《中国海洋湖沼学报》2008,26(3):233-237

Bacterin was prepared by formalin-inactivating the virulent strain of Vibrio hollisae isolated from diseased Seriola dumerili （amberjack） suffering from vibriosis. Healthy S. dumeriIi were vaccinated by respective procedures of intramuscular injection, immersion, and orally administration. Results of the three different vaccinations were compared. Blood was drawn from the vaccinated fish every 7 days, and the antibody titers and lysozyme activities of the sera were determined. The antibody titer of injected fish was 1：40 at 7 d, and reached its peak of 1：320 at 28 d, while the fish vaccinated by immersion and orally administration exhibited weak antibody responses, the antibody titres of 〈1：10, 1：20, 1：160 were observed at 7 d, 14 d, 35 d respectively. Compared with the control, the vaccinated fish exhibited significantly higher lysozyme activities （P〈0.05）. Upon challenge with virulent strain, the relative percent survival （RPS） of injected, immersed and oral administrated fish were 75%, 45%, and 40% respectively, and the injected fish showed significantly higher RPS than immersed and oral administrated fish. The results suggested that vaccination of S. dumerili by the injection would be the best strategy to prevent the vibriosis in S. dumerili farm.  相似文献   

中国大陆及邻GRACE卫星重力变化研究     

邹正波  邢乐林  李辉  康开轩  周新 《大地测量与地球动力学》2008,28(1)

探讨如何运用GRACE数据进行重力变化的计算和分析.对GRACE重力场位系数的最大阶次选取进行了分析,并利用月卫星重力场模型计算了中国大陆及邻区的重力变化,通过平均半径为800km的高斯平滑,得出了合理的重力变化结果.  相似文献