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Transport and distribution of nutrients in anchovy spawning ground to the southern waters of Shandong Peninsula

Acta oceanologica Sinica 2003年第4期22卷 533-546页

作者： Gao Shengquan 1,2.Lin Yi’an 1,2. Jin Mingming1,Liu Xiaoya1 1. Laboratory of Regional oceanography, Second institute of oceanography, State oceanic Administration, Hangzhou 310012. china. 2. Laboratory of Submarine Geosciences, Hangzhou 310012.china State ocean Adm Inst Oceanog 2 Lab Reg Oceanog Hangzhou 310012 Peoples R China Lab Submarine Geosci Hangzhou 310012 Peoples R China

The distribution of nutrients and the effect of side transport of nutrients on anchovy spawning ground to the southern waters of Shandong Peninsula are discussed based on the data collected in June 2.00, May and June 2.01. The coastal current and upwelling are the main physical processes of nutrient transport to the southern waters of Shandong Peninsula. The concentrations of nutrients, Chl-a, the density of anchovy eggs, larva and juvenile fish increase obviously where they are greatly affected by these processes, while the contents of nutrients and Chl-a, the density of anchovy eggs, larva and juvenile fish decrease significantly where these processes diminish or disappear. The investigation suggest that the side transport of nutrients by Lubei (North Shandong) coastal current in the northern area causes the Chl-a content to be high and dense anchovy eggs, larva and juvenile fish to be dense in the coastal area of the Chengshan Cape. In the southern area, the riverine input from Subei irrigation ditch with high content of nutrients inshore and upwelling in the western edge of the Huanghai Sea Cold Water offshore should be responsible for high Chl-a concentration and dense anchovy eggs, larva and juvenile fish. It is possible that these processes of nutrient transport have controlled the anchovy spawning ground to the southern waters of Shandong Peninsula.

关键词： nutrients distribution features anchovy spawning ground Shandong Peninsula

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Drag increment due to internal waves generated by Rankine ovoid

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Progress in Natural Science:Materials International 2002年第11期 51-55页

作者： XU Zhaoting, ZHOU Xiwu and CHEN Xu(1. institute of physical {2.ography and physical {2.ography Laboratory, {2. university of qingdao, qingdao 2.6003, china 2. Key Laboratory of Marine Science and Numerical Modeling of State {2.ic Administration, qingdao 2.6061, china) institute of physical {2.ography and physical {2.ography Laboratory，{2. university of qingdao，qingdao 2.6003，china Key Laboratory of Marine Science and Numerical Modeling of State oceanic Administration，qingdao 2.6061，{2. institute of physical {2.ography and physical {2.ography Laboratory，{2. university of qingdao，qingdao 2.6003，china

The experimental results on drag increment caused by internal waves, which are generated by a Rankine ovoid towed horizontally at constant velocities in a two-layer stratified water (a strong pycnocline) initially at rest, are presented. The drag increment due to stratification is obtained experimentally as a function of internal Froude number Frd and Reynolds number Re. From the results, it is shown that as a function of Frd or Re, an increment in mean drag coefficient due to stratification △Cd has both increasing and decreasing region attributable respectively to internal wave and to collapse of mixing fluids in the wakes. A most significant result shows that when Frd = 0.838 there exists a maximum of △Cd, which is equal to 0.05 in the exciting region of the strong internal wave generation.

关键词： internal wave wake stratified flow drag increment.

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ASYMPTOTIC ANALYSIS OF DOWNSTREAM EIGENVALUES FOR STATIONARY PERTURBATION OF COUETTE-POISEUILLE FLOW

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Journal of Hydrodynamics 2003年第5期15卷 41-48页

作者： SongJin-bao WeiEn-bo TianJi-wei instituteofoceanology ChineseAcademyofSciencesQingdao266071China physicaloceanographyLaboratory OceanUniversityofChinaQingdao266003China

Two-dimensional viscous flow in a straight channel was studied. The steadyNavier-Stokes equations were linearized on the assumption of small disurbance from theCouette-Poiseuille flow, leading to an eigenvalue equation resembling the Orr-Sommerfeld *** eigenvalues determine the rate of decay for the stationary perturbation. Asymptotic forms of thedownstream eigenvalues were derived in the limiting cases of small and large Reynolds number, forthe flow with a general mass flux per unit width, and thus the work of Wilson (1969) and Stocker andDuck (1995) was generalized. The asymptotic results are in agreement with numerical ones presentedby Song and Chen (1995).

关键词： eigenvalue stationary perturbation couette-poiseuille flow

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A correction on two dimensional KdV equation with topography

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Progress in Natural Science:Materials International 2004年第7期 94-96页

作者： XU Zhaoting 1*, Efim PELINOVSKY 2. SHEN Guojin 1 and Tapiana TALIPOVA 2.1. institute of physical {2.ography and physical {2.ography Laboratory, {2. university of china, qingdao 2.6003, china 2. institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod 603950, Russia) institute of physical {2.ography and physical {2.ography Laboratory Ocean University of China Qingdao 266003 China institute of Applied Physics Russian Academy of Sciences Nizhny Novgorod 603950 Russia

The correction on the 2. KdV equation derived by Djordjevic and Redekopp is presented. A lapsus calami in the 2. KdV equation is removed by means of the conservation principle of the energy flux in a wave ray tube. The results show that the coefficient of the third term in the inhomogeneous term of 2. KdV equation in the paper of Djordjevic and Redekopp is 2. instead of 3.

关键词： D KdV equation soliton wave ray tube correction.

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Variation of reactivity of particulate and sedimentary organic matter along the Zhujiang River Estuary

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Acta oceanologica Sinica 2003年第4期22卷 557-568页

作者： Chen Jianfang 1,2. Jin Haiyan 1,2. Yin Kedong3, Li Yan 1,2.1. Key Laboratory of Submarine Geosciences of State oceanic Administration, Hangzhou 310012. china. 2. Laboratory of Regional oceanography, Second institute of oceanography, State oceanic Aedministration, Hangzhou,310012. china 3. Department of Biology, Hong Kong university of Science and Technology, Hong Kong Kay Lab Submarine Geosci State ocean Adm Hangzhou 310012 Peoples R China State ocean Adm Inst Oceanog 2 Lab Reg Oceanog Hangzhou 310012 Peoples R China Hong Kong Univ Sci & Technol Dept Biol Hong Kong Hong Kong Peoples R China

To investigate organic matter source and reactivity in the Zhujiang River (Pearl River) Estuary and its adjacent areas, particulate organic carbon (POC), particulate hydrolysable amino acids (PHAA), and Chl a during two cruises in July 1999 and July 2.00 were measured. The highest POC and PHAA concentration was observed in the waters with maximum Chl a. The spectra distribution, relative content (dry weight in milligram per gram), PHAA-C% POC and other indicators such as the ratios of amino acids vs. amino sugars (AA/AS) and glucosamine vs. galactosamine (Glum/Gal) suggested that particulate amino acids in the water column and sediments in the Zhujiang River Estuary were mainly derived from biogenic processes rather than transported from terrestrial erosion. In inner estuary where high turbidity was often observable, organic matter was mainly contributed by re-suspension of bottom sediments with revealed zooplankton, microbial reworked characteristics, which suggest that these organic matters were relatively 'old'. In the estuarine brackish region, organic matter in water column is mainly contributed by relatively fresh, easily degradable phytoplankton derived organic matter. During physical - biological processes within the eastuary, organic matter derived from phytoplankton was subjected to alteration by zooplankton grazing and bacterial reworking.

关键词： organic matter reactivity amino acids the Zhujiang River Estuary

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Dispersion relation of internal waves in thewestern equatorial Pacific ocean

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Acta oceanologica Sinica 2000年第4期19卷 37-45页

作者： Fang Xinhua Jiang Mingshun Du Tao physical oceangraphy Laboratory Institute of Physical OceanographyOcean University of QingdaoQingdao 266003China institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China

Based mainly on TOGA-COARE data, that is, the CTD data from R/V Xiangyanghong No. 5 (Pu et al., 1993), the temperature and current data from the Woods Hole mooring and other deep current data, the layered numerical profiles of buoyancy frequency and mean current components are figured out. A numerical method calculating internal wave dispersion relation without background shear current, used by Fliegel and Hunkins (1975), is improved to be fit for the internal wave equation with mean currents and their second derivatives. The dispersion relations and wave functions of the long crested internal wave progressing in any direction can be calculated conveniently by using the improved method. A comparison between the calculated dispersion relation in the paper and the dispersion relation in GM spectral model of ocean internal waves (Garret and Munk, 1972. is performed. It shows that the mean currents are important to the dispersion relation of internal waves in the western equatorial Pacific ocean and that the currents make the wave progressing co-directional with (against) the currents stretched (shrink). The influence of the mean currents on dispersion relation is much stronger than that of their second derivatives, but that on wave function is less than that of their second derivatives. The influences on wave functions result in the change of vertical wavenumber, that is, making the wave function stretch or shrink. There exists obvious turning depth but no significant critical layer absorption is found.

关键词： Internal wave dispersion relation equatorial ocean the western Pacific ocean

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KUROSHIO INTRUSION INTO THE SOUTH china SEA

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Journal of Hydrodynamics 2006年第6期18卷 702-713页

作者： ZHANG Qing-hua FAN Hai-mei QU Yuan-yuan institute of physical {2.ography Ocean University of China Qingdao 266003 China Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration Qingdao 266061China

In this article, the circulation of the South china Sea （SCS）, which is idealized as the rectangular basin with constant depth, is studied under Kuroshio boundary forces. Starting from the linearly quasi-geostrophic vorticity equation, the solution of the SCS circulation is given in the form of corrected Fourier series under proper boundary conditions. The results show that the intruded current flows westward and separates into the northward branch and the southward branch before arriving at the western boundary. The southward branch flows out of the SCS through the southwestern passage, at the same time, the induced cyclonic （anti-clockwise） ring almost occupies the middle and southern parts, and concomitant anti-cyclonic （clockwise） vortex appears between the cyclone and the western boundary. While the northward branch outflows through the northeastern passage, the anti-cyclonic （clockwise） ring is triggered at the northern part of the SCS. The above two vortexes are both intensified if the south-entering and the north-leaving current loop intrusion are superposed. The outer flow of the northern vortex flows westward, then northward, and then eastward, and it is very similar to the configuration of the SCS Warm Current （SCSWC） at the northern part of the SCS, thus, a kind of generating mechanism of the SCSWC is presented.

关键词： Kuroshio boundary forces South china Sea (SCS) SCS Warm Current (SCSWC)

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A Lagrangian mean theory on coastal sea circulation with inter-tidal transports Ⅱ. Numerical Experiments

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Acta oceanologica Sinica 2009年第1期28卷 1-14页

作者： JU Lian JIANG Wensheng FENG Shizuo Key Laboratory of physical oceanography of Ministry of Education Institute of Physical Oceanography Ocean University of China Qingdao 266100 China

The results of the new concept of coastal sea circulation are demonstrated by numerical simulations for the first *** numerical experiments in three types of rectangular model seas illustrate the dependence of circulation on tidal phases due to the convectively nonlinear effect which is estimated by a newly defined drift dispersion ***,the present theory is applied in the Bohai Sea of *** the Bohai Straits and the Huanghe River mouth area the circulation direction even reverses owing to different initial tidal phases which shows that the theory copes with nonlinearity *** calculated M2.tide-induced residual circulation shows that a clockwise gyre exists in the center of an anticlockwise gyre in the central Bohai Sea due to the topographic *** the Bohai Gulf the tide induced circulation shows a 3D structure with outflow at the surface and the inflow at the bottom which can partly explains the spread of the Huanghe River fresh water out of the Bohai Gulf and the inflow of the sediment from the Huanghe River.

关键词： numerical model coastal water circulation Lagrangian residual velocity Bohai Sea

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Numerical study of M_2.internal tide generation and propagation in the Luzon Strait

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Acta oceanologica Sinica 2011年第5期30卷 23-32页

作者： LI Huan SONG Dan CHEN Xueen QIAN Hongbao MU Lin SONG Jun National Marine Data and Information Service State Oceanic Administration Tianjin 300171 China Key Laboratory of ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China College of physical and Environmental oceanography Ocean University of China Qingdao 266100 China Administrative Center for china＇s Agenda 2. Beijing 100038 China

Based on the z-coordinate ocean model HAMSOM,we introduced the internal-tide viscosity term and applied the model to numerically investigate the M2.internal tide generation and propagation in the Luzon Strait （LS）.The results show that （1） in the upper 2.0 m depth,at the thermocline,the maximum amplitude of the generated internal tides in the LS can reach 40 m;（2. the major internal tides are generated to the northwest of Itbayat Island,the southwest of Batan Island and the northwest of the Babuyan Islands;（3） during the propagation the baroclinic energy scattering and reflection is obvious,which exists under the effect of the specific topography in the South china Sea （SCS）;（4） the westward-propagating internal tides are divided into two branches entering the *** passing through 118 E,the major branch is divided into two branches *** strongest internal tides in the LS are generated to the northwest of Itbayat Island and propagate northeastward to the ***,to the east of 12. E,most of the internal tides propagate southeastward to the Pacific as a beam.

关键词： M2.internal tides HAMSOM Internal tidal energy flux Luzon Strait

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Detection of nighttime sea fog/stratus over the Huang-hai Sea using MTSAT-1R IR data

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Acta oceanologica Sinica 2009年第2期28卷 23-35页

作者： GAO Shanhong WU Wei ZHU Leilei FU Gang HUANG Bin physical oceanography Laboratory Ocean University of China Qingdao 266003 China Shandong Provincial Meteorological institute Jinan 250031 China National Meteorological Center China Meteorological Administration Beijing 100081 China

A dual channel difference （DCD） method is applied to detect nighttime sea fog/stratus over the Huanghai Sea using the infrared （IR） data of shortwave （3.5-4.0 μm） and longwave （10.3-11.3 μm） channels from the Multi-functional Transport Satellite （MTSAT）-IR, i.e., shortwave minus longwave brightness temperature difference （SLTD）. Twenty-four sea fog events over the Huanghai Sea during March to July of 2.06 and 2.07 are chosen to determine a suitable value of SLTD for nighttime sea fog/stratus detection, and it is found that the value of-5.5-2.5℃ can be taken as a criterion. Two case examples of sea fog events are especially demonstrated in detail utilizing the criterion, and the results show that the derived sea fog/stratus coverage is quite reasonable. This coverage information is very helpful to analyze the formation and evolution of sea fog/stratus during night and can provide sea fog researchers with observational evidences for model results verification. However, more efforts are needed to further obtain vertical extent information of sea fog/stratus and attempt to discriminate between sea fog and stratus.

关键词： Huanghai Sea nighttime sea fog MTSAT-1R dual channel difference method

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