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Benthic foraminifera and bottom water evolution in themiddle-southern Okinawa Trough during the last 18 ka

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Science china Earth Sciences 2005年第6期48卷 805-814页

作者： LI Tiegang1, XIANG Rong1,2, SUN Rongtao1 & CAO Qiyuan1 1. Institute of oceanology, Chinese Academy of Sciences, qingdao 266071, china 2. College of Geosciences, ocean university of china, qingdao 266003, china Correspondence should be addressed to Li Tiegang Institute of oceanology Chinese Academy of Sciences Qingdao China College of Geosciences Ocean University of China Qingdao China

A piston sediment core E017 from the middle-southern Okinawa Trough was investigated. A preliminary study of the deep-water evolution since 18 cal. ka BP was performed basedon the quantitative census data of benthic foraminiferal fauna, together with planktonic foraminiferal oxygen and carbon isotope, AMS14C dating, and the previous results achieved in thesouthern Okinawa Trough. The result shows that the benthic fauna was dominated by Buliminaaculeata (d′Orbigny), Uvigerina peregrina (Cushman), Hispid Uvigerina and Uvigerina dirupta(Todd) during the glaciation-deglaciation before 9.2 cal. ka BP, while Epistominella exigua(Brady), Pullenia bulloides (d′Orbigny), Cibicidoides hyalina (Hofker), Sphaeroidina bulloides(d’Orbigny) and Globocassidulina subglobosa (Brady) predominated the fauna in the post-glaciaperiod after 9.2 cal. ka BP. The benthic foraminifera accumulation rate (BFAR), paleoproductivityestimates and benthic foraminiferal assemblage conformably indicate that surface water paleoproductivity and organic matter flux during the glaciation-deglaciation were higher than those othe post-glacial period in the middle-southern Okinawa Trough, and gradually enhanced from thesouthern to the central Okinawa Trough during the glaciation-deglaciation, which could becaused by the discrepancy of the terrigenous nutrients supply. High abundances of E. exigua, anindicator of pulsed organic matter input, after 9.2 cal. ka BP may indicate that the intensity oseasonally riverine pulsed flux during the post-glacial period was stronger than that of the glaciation-deglaciation period, and the seasonal influx in the central trough might be stronger than inthe south. The temporal distributions of the typical species indicating bottom water oxygen content and ventilation condition show that the ventilation of the bottom water during the post-glaciaperiod is more active than the glaciation-deglaciation, which reflects that the evolution of the intermediate and deep waters of the n

关键词： benthic foraminifera, the Okinawa Trough, deep-water evolution.

PROPAGATION OF LONG-LIVED ANTICYCLONIC ROSSBY EDDIES OVER AN ISOLATED TOPOGRAPHY AND THEIR MERGING

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Journal of Hydrodynamics 2001年第3期13卷 34-45页

作者： Luo, De-Hai Lu, Yan ocean Univ. of qingdao Qingdao 266003 China

In a barotropic model the propagation of long-lived anticyclonic Gaussian eddies larger than the radius of deformation over a Gaussian-shaped topography and the merging of the two anticyclonic eddies are investigated by solving the generalized Flierl-Yamagata equation. It is shown that whether or not the basic flow is present, the isolated topography seems to encourage the amplification of an anticyclonic eddy and its southwest movement around the hill In the absence of both the westward flow and the topography, two anticyclonic eddies of identical sizes and amplitudes can merge. However, either the including of the topography or the westward basic flow can make them not merge. In the presence of both, the eddies can merge, but this merging depends on whether the parameter condition is appropriate or not. Therefore, it can be concluded that the topographic forcing might be a possible mechanism for the merging of two anticyclonic eddies.

关键词： Amplification Equations of motion Merging Surface topography Two dimensional

A new algorithm for microwave radiometer remote sensing of sea surface salinity and temperature

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Science china Earth Sciences 2006年第11期49卷 1204-1211页

作者： YIN Xiaobin1, LIU Yuguang1, WANG Zhenzhan2 & XIU Peng1 1. Physical oceanography Laboratory, ocean university of china, qingdao 266003, china 2. Center for Space and Applied Research, Chinese Academy of Sciences, Beijing 100080, china Physical oceanography Laboratory Ocean University of China Qingdao China Center for Space and Applied Research Chinese Academy of Sciences Beijing China

The microwave radiation of the sea surface, which is denoted by the sea surface brightness temperature, is not only related with sea surface salinity (SSS) and temperature (SST), but also influenced by sea surface wind. The errors of wind detected by satellite sensor have significant influences on the accuracy of SSS and SST retrieval. The effects of sea surface wind on sea surface brightness temperature, i.e. △Th,v, and the relations among △Th,v, wind speed, sea surface tempera- ture, sea surface salinity and incidence angle of observation are investigated. Based on the investi- gations, a new algorithm depending on the design of a single radiometer with double polarizations and multi-incidence angles is proposed. The algorithm excludes the influence of sea surface wind on SSS and SST retrieval, and provides a new method for remote sensing of SSS and SST.

关键词： microwave radiometer, sea surface temperature, sea surface salinity, wind, brightness temperature.

THE SIMULATION OF THE SAR IMAGE OF INTERNAL SOLITARY WAVES IN ALBORAN SEA

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Journal of Hydrodynamics 2001年第3期13卷 88-92页

作者： Meng Jun min ocean university of qingdao, qingdao 266003, china Zhang Zi li, Zhao Jun sheng First Institute of oceanography, State oceanic Administration, qingdao 266061, china Zhang Jie Key Laboratory of Marine Science and Numerical Modelling, ocean Univ. of qingdao Qingdao 266003 China

SAR imaging mechanism of internal wave is studied. The numerical modelling of internal waves is obtained by the two level scheme. The simulaed SAR images that have better expressed the features of internal waves are ... 详细信息

关键词： internal wave soliton SAR simulation

Meso-scale circulation at the intermediate-depth east of Mindanao observed by Argo profiling floats

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Science china Earth Sciences 2010年第3期53卷 432-440页

作者： ZHOU Hui1, YUAN DongLiang1, GUO PeiFang2, SHI MaoChong2 & ZHANG QiLong 1 Key Laboratory of ocean Circulation and Wave Studies, Chinese Academy of Sciences, qingdao 266071, china 2 Physical oceanography Laboratory, ocean university of china, qingdao 266100, china Key Laboratory of ocean Circulation and Wave Studies Chinese Academy of Sciences Qingdao China Physical oceanography Laboratory Ocean University of China Qingdao China

The meso-scale circulation at the intermediate depth east of Mindanao is studied using Argo profiling floats observations. The trajectories and the parking-depth velocities of Argo floats show that the intermediate-depth circulation east of Mindanao contains significant meso-scale features that are highly variable both in space and in time. Both cyclonic and anticyclonic eddies at the intermediate depth (1000–2000 m) are indicated by the trajectories east of Mindanao. The mean tangential velocities of these eddies are about 10 cm/s at 2000 m and over 20 cm/s at 1000 m, which indicates that the geostrophic calculation may contain large errors due to the vigorous eddy activity at the reference levels. The analyses also suggest that these eddies might play an important role in mass and vorticity balances of the intermediate-depth circulation east of Mindanao.

关键词： Mindanao Current intermediate-depth circulation meso-scale eddy Argo profiling float

An analytically derived whitecap coverage model

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Acta oceanologica Sinica 1995年第3期14卷 329-336页

作者： Xu Delun and Liu Wentong(Laboratory of Physical oceanography, ocean university of qingdao, qingdao 266003, china)

Joint probability function of local surfaces-particle and phase velocities is derived for a stationary Gaussianwave field with narrow-band spectrum. From the function a model of whitecap coverage is further derived by using thekinematic condition (including the effect of drift current) for wave breaking. The drift current velocity in the model isthen replaced by the friction velocity through an existing empirical formula. A coefficient in the model for relating temporal and spatial scales of wave breaking is determined by using an existing empirical formula of oceanic whitecap coverage and the well-known Pierson-Moskowitz spectrum. The main features of the model agree well with our generalknowledge and observational evidence on wave breaking in deep waters.

关键词： Velocity of surface-particle local phase velocity. whitecap coverage

Influence of permeability on hydrothermal circulation in the sediment-buried oceanic crust

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Science china Earth Sciences 2006年第7期49卷 773-784页

作者： WANG Xingtao1,2, ZHAI Shikui1, MENG Fanshun1, LI Huaiming1, YU Zenghui1, SUN Ge1 & XUE Gang1 1 Marine Geoscience Institute, ocean university of china, qingdao 266003, china 2 Bureau of ocean and Fishery, Weihai 264200, china Marine Geoscience Institute Ocean University of China Qingdao China Bureau of ocean and Fishery Weihai China

Hydrothermal convection in the upper oceanic crust has been inferred to be a common and important process. Under the simplified conditions of planar boundaries, permeability provides a strong constraint on the pattern of circulation, the dimensions of convective cells and flow field of hydrothermal circulation. By applying an advanced numerical modeling method, to our knowledge, it is the first time to investigate convection as it is influenced by different strata permeability structures, formational anisotropy, fracture zone and cooling intrusion. The simplified geological model is com-posed of 3 layers, sedimentary layer, high permeable basement layer and low permeable basement layer from top to bottom. When permeability in high permeable layer is 10 times larger than that in sedimentary layer, convection occurs in high permeable layer. The pattern of hydrothermal circulation and flow velocity of hydrothermal fluid are strongly influenced by strata permeability structures, changes of permeability in high permeable basement layer, fracture zone and cooling intrusion. However, formational anisotropy relatively exerts weak influence on hydrothermal circulation, with the ratio up to 1.5 of vertical permeability to lateral permeability in high permeable layer. Fracture zone existing in basement is the most important factor affecting the circulation field. The effects of a local intrusion are limited to convection intensity above the intrusion and have little impact on the fluid flow on a regional scale. As the result of numerical modelling, key factors affecting the hydrothermal cir-culation are good permeable zone and long-term heat source, not including fluid source.

关键词： hydrothermal circulation, permeability, oceanic crust, numerical model.

Genetical study on the parthenogenesis in Laminaria japonica

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Acta oceanologica Sinica 1993年第2期12卷 295-298页

作者： Dai Jixun, Cui Jingjin, Ou Yulin and Fang Zongxi department of Biology, ocean university of qingdao, qingdao 266003, china

The parthenogenesis and natural doubling of chromosomes in wild type female gametophytes of Laminaria japonica were studied. The results indicate that not all the female gametophytes from the wild type hybrid parent can propagate through parthenogenesis. Most parthenosporophytes can mature, their spores germinate into gametophytes, the latter then developed into female sporophytes. To form these parthenosporophytes the natural doubling of chromosomes occurred mainly at the first and second cell divisions of the spores. It is thus considered that the parthenogenesis of L. japonica is inheritable and the relative genes link closely with the genes controlling the natural doubling of chromosomes and the female determination.

关键词： Laminaria japonica parthenogenesis Chromosome doubling

Subdirectly Irreducible and Directly Indecomposable Lattice Implication Algebras

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Chinese Quarterly Journal of Mathematics 2004年第4期19卷 385-392页

作者： WANG Xue-fang, XU Yang, SONG Zhen-ming(1.department of Mathematics, ocean university of china, qingdao 266003, china 2.department of Applied Mathematics, Southwest Jiaotong university, Chengdu 610031, china) department of Mathematics Ocean University of China Qingdao 266003 China department of Applied Mathematics Southwest Jiaotong University Chengdu 610031 China

Lattice implication algebra is an algebraic structure that is established by combining lattice and implicative algebra. It originated from the study on lattice-valued logic. In this paper, we characterize two special classes of lattice implication algebra, namely, subdi-rectly irreducible and directly indecomposable lattice implication algebras. Some important results are obtained.

关键词： many-valued logic lattice implication algebra filter ultra-filter prime filter