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A model for wave growth in fetch-limited conditions

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Acta Oceanologica Sinica 1997年第1期16卷 45-56页

作者： Li Luping first institute of oceanography, State Oceanic Administration, Qingdao 266003, China first institute of oceanography State Oceanic Administration Qingdao 266003 China

In this paper, it is held that the universal relationships of wave growth in fetch-limited conditions , i. e., (f|~) p=A(x|~)-Band (m|~)0= C(x|~) Dshould satisfy the Toba 3/2 power law and the wave energy balance equation. In the ideal generation situation, theoretically it can be derived that the ideal fetch-limited wave growth relationship should have D=3B and D+B =1, (i.e., B = 0.25, D = 0.75 ) and A3C=2. 1×l(T4C^(1/2)_d , where Cd is the drag coefficient. The 3/2 power law, the wave energy balance equation and the decrease of wave steepness with increasing fetch have became three requirements which should be satisfied by fetch-limited wave growth algorithms. A semi-empirical and semi-theoretical model for fetch-limited wave growth is presented. In the application to the slanting wind situation an un(?)ersal relationship of dimensionless wave energy vs dimensionless peak frequency is presented and the comparisons show that the model is in good agreement with observations.

关键词： Wave growth fetch-limited wave field universal relationship

Role of Kuroshio frontal eddy in exchange between shelf water and Kuroshio water in East China Sea

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Acta Oceanologica Sinica 1997年第1期16卷 1-18页

作者： Guo Binghuo and Ge Renfeng first institute of oceanography, State Oceanic Administration, Qingdao 266003, China first institute of oceanography State Oceanic Administration Qingdao 266003 China

Basic patterns of the reversal of the Kuroshio water toward the shelf, intrusion of the shelf mixed water into the Kuroshio and uplifting of the near-bottom nutrient-rich water into the upper layer by the pumping of the frontal eddy are analyzed on the basis of satellite infrared images and hydrologic, chemical and biological observations. Results show that the Kuroshio frontal eddies play a very important role in the exchange between the shelf water and the Kuroshio water. The estimation of the average volume transports for three frontal eddy events indicates that the shelf mixed water entrained by an eddy into Kuroshio is 0.44×10~6 m3/s and the reversal Kuroshio water onto the shelf region only 0.04×10~6 m3/s. Along the whole shelf edge, the volume transport of the shelf mixed water entrained by the eddies into the Kuroshio is 1.8×10~6 m3/s. The nutrient (NO3-N) flux pumped to the euphotic zone and input to the continental shelf through a column with 1 m wide is 974 μmol/(s·m) when there is frontal eddy and only 79 μmol/(s·m) in the case of no frontal eddy. Yearly nutrient (NO3-N) flux input to the shelf area caused by the frontal eddy is 1.7×10~5 t/a.

关键词： Kuroshio in the East China Sea frontal eddy water exchange nutrient flux

Study on optimization of parameters in a biological model

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Acta Oceanologica Sinica 2001年第2期20卷 215-220页

作者： Wan Zhenwen, Qiao Fangli, Yuan Yeli (1. first institute of oceanography, State Oceanic Administration, Qingdao 266061, China) first institute of oceanography State Oceanic Administration Qingdao 266061 China

According to the data observed in a China- Japan Joint Investigation, the parameters of an ecosystem dynamics model (Qiao et al., 2000) were optimized. The values of eighteen parameters for the model were obtained, with nutrient half saturation constant, Kn= 1.4μmol/dm3, Kp = 0.129 μmol/dm3 and K3= 1. 16μmol/dm3 for the diatom and Kn= 0.345μmol/dm3, Kp=0. 113μmol/dm3 for the flagellate. The proposals to set up a function for this multiple objective problem were discussed in detail.

关键词： Phytoplankton biological model parameter optimization

The mixing mechanism in the formation of ocean shear waves

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Acta Oceanologica Sinica 1996年第2期15卷 145-158页

作者： Qiao Fangli(first institute of oceanography, State oceanic Administration, Qingdao 266003, China) first institute of oceanography State Oceanic Administration Qingdao 266003 China

Based on the quasi-geostrophic vorticity equation, the present peper simulates the water mxing process in the formation Of ocean shear waves using large eddy simulation methods. From Lagrangian tracing, we study the ocean shear wave's changing from wave character to vortex character. The distance between tracer groups increases near the ocean shear wave area, and decreases between ocean shear waves. The tracers that are uniformally distributed in space do not retain the uniform character in the mixing process. The frequency shift of the perturbation waves is caused by their nonlinear interaction. The wave number ratio and phase lag of the initial perturbation waves affect the mixing process, but the results show little difference. The increase of the viscosity coefficient will restrain the mixing process.

关键词： Ocean shear wave Lagrangian tracing mixing

Some observational results of sea storm current

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Acta Oceanologica Sinica 2001年第2期20卷 299-308页

作者： Xiu Richen, Liu Aiju, Ye Hesong, Gu Yuhe, Xu Lanying (1. first institute of oceanography, State Oceanic Administration, Qingdao 266061, China 2. institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China) first institute of oceanography State Oceanic Administration Qingdao 266061 China

INTRODUCTIONDr. Hollister, a marine geologist of the Woods Hole Oceanographic Institution, first pointed out that there was ocean storm current in the ocean. He found out the wavy texture in the seabed core samples, and suggested that this wavy texture was caused by the high speed sea current in remote antiquity. He then suggested a bold hypothesis that there existed a benthic storm current near the ocean bottom, and presented this hypothesis at the IUGG conference held at San Francisco in 1963. Unfortunately, the attention was not drawn to the hypothesis at the conference, and the hypothesis was criticized as a sheer nonsense.

关键词： Sea storm current tidal storm current chaotic motion

A topological pattern research on recent evolution of sand spit at the Huanghe River mouth by using remote sensing informations

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Acta Oceanologica Sinica 2000年第2期19卷 45-55页

作者： Liu Baoyin1 Wang Yanfeng1 Gao Junguo1 (1. first institute of oceanography, State Oceanic Administration, Qingdao 266003, China) first institute of oceanography State Oceanic Administration Qingdao 266003 China

By using satellite remote sensing informations, the conceptual system of time-space at tributes and time dimension in recent evolution of the sand spit at the Huanghe River mouth is expound ed. Based on this work, the parameterization of relevant factors and topological analysis of sand spit spa tial structure are conducted, and a model, which is suitable for representing the development and growth of the Huanghe River mouth is developed. It is shown that during the later stage of its development, the Sand spit growth index is almost 0. According to the parallelogram rule, under the reinforce effects of the Coriolis force and ocean dynamics, the Sand spit of current stream will never extend towards sea when it reaches the deep-water area. This work would be helpful to the imminent comprehensive harness of the 'man-made river branch' at the Huanghe River mouth.

关键词： Remote sensing Huanghe River mouth sand spit topology

A preliminary study on benthos food web structure oftidal zone in the Laoshan Bay by using stable carbon isotopes

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Acta Oceanologica Sinica 2000年第4期19卷 81-89页

作者： Cai Deling Hong Xuguang Mao Xinghua Zhang Shufang Gao Sulan first institute of oceanography State Oceanic AdministrationQingdao 266061China

By anayses of carbon isotopic composition (δ13C values) of the benthos collected in the Laoshan Bay in August 1993 and February and May 1994, it is found that the main food sources of the benthos can be divided into four groups in terms of carbon isotope composition: Particulate Organic Matter (POM), benthic diatoms, benthic macroalgae and the organic matter in sediments. The results show that the carbon isotopic composition of the benthic animals has a close relation with that of the food they take in. The Carbon isotopic compositions of benthos may be useful in elucidating their food sources. The carbon isotopic data have confirmed that POM is the main food source of the benthic filter feeders such as bivalves; crustaceans have a wide range of δ13C values, showing their food source has diversity; benthic diatoms are an important fraction of the food for most of gastropods. A preliminary investigation of the benthic-pelagic coupling in that region using the stable carban isotopic tracers has confirmed the importance of POM as a food source for benthos in this region, but the organic matter in sediments and benthic diatoms are also relatively important for a lot of benthic animals. The benthic-pelagic coupling in the Laoshan Bay temperate ecosystem is not so tight as that in ecosystems at higher latitudes such as northeastern water polynya.

关键词： Carbon isotopes food web benthos trophic level

Distribution　of　biomass　of　zooplankton　in　the　Kuroshio　area　of　the　East　China　Sea

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Acta Oceanologica Sinica 1996年第3期15卷 365-376页

作者： Meng Fan Chen Shiqun and Wu Baoling (first institute of oceanography, State oceanic Administration, Qingdao 266003, China) first institute of oceanography State Oceanic Administration Qingdao 266003 China

This paper makes an analysis and study of the plankton samples collected from the Kuroshio and its adjacent areas in the north of the East China Sea during the seven successive years (from 1986 to 1992) in the implementation of the programme 'China-Japan Joint Research on the Kuroshio' as well as a brief summary of the distribution of the biomass of food zooplankton and its relation to the oceanic environment. The results indicate that the biomass of zooplankton in the study area is relatively low, with in annual mean of 71. 22 mg/m3 only. The seasonal variation of biomass is not obvious and salinity is an important factor influencing seasonal and annual variations of zooplankton biomass in the study area. The Kuroshio front in the East China Sea and the Tsushima Warm Current front divide the study area into two parts from north to south in the vicinity of the 200 m isobath: the biomass in the western part was greater than 50 mg/m3,whereas was less than 50 mg/m3 in the eastern part. The spatiotemporal distributions of different ecological groups of zpplankton and their biomass basically reflect the basic features of the hydrolagical conditions in each season in the study area.

关键词： Zooplankton biomass Kuroshio area

The influence of the surface heat fluxes of the Kuroshio key-area on meiyu rainfall in the Changjiang River region

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Acta Oceanologica Sinica 1991年第1期10卷 73-82页

作者： Ding Liangmo first institute of oceanography,State Oceanic Administration,Qingdao,China first institute of oceanography State Oceanic Administration Qingdao China China

On the basis, of the surface heat fluxes of the Kuroshio key-area (26°-30°N, 125°-30°E)in March andApril, the climatologicai influence of the Kuroshio heat fluxes on meiyu rainfall in the Changjiang River (Yangtse River) region are studied. The results are concluded as follows;the surface heat fluxes of the Kuroshio key-area have certain influence on meiyu rainfall in the Changjiang River region during June and July. The correctness rates for the five stations in the Changjing River region (i. e. Wuhan, Jiujiang, Anqing,Nanjing and Shanghai)are in the range of 9/20-13/20. The surface heat fluxes influence mainly on the homogeneous rainfall pattern,the correctness rates come to 7/10-8/10 for the lower valley of the Changjiang River. The estimation expression of the meiyu rainfall for Shanghai consisting of the surface heat flux and the sea surface temperature anomaly of the Kuroshio key area agrees well with the actual meiyu rainfall condition.

关键词： heat The influence of the surface heat fluxes of the Kuroshio key-area on meiyu rainfall in the Changjiang River region area