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An analysis on the formation mechanism of the distributionof high content of chlorophyll-a in the continentalshelf edge waters of East china Sea

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Acta Oceanologica Sinica 1992年第1期11卷 97-107页

作者： Fei Zunle first institute of oceanography, state oceanic administration, qingdao 266003, china

On the basis of the data obtained from the comprehensive Kuroshio surveys in 1987-1988,this paper analyses the oceanographic characteristics in the area (125°-130° E,27°-31° N) of the continental shelf edge of the East china Sea (E. C. S. ) and its adjacent waters and discusses the effects of the Kuroshio front,thermocline and upwelling of the Kuroshio subsurface water on the distribution of standing stock of phytoplankton (chlorophyll-a). The distribution of high content of chlorophylly-a has been detected at 20-50 in depth in the water body on the left side of the Kuroshio front in the continental shelf edge waters of the E. C. S. The high content of chlorophyll-a spreads from the shelf area to the Kuroshio area in the form of a tongue and connects with the maximum layer of subsurface chlorophyll-a of the Kuroshio and pelagic sea. The author considers that the formation of the distribution of high content chlorophyll-a in this area results from the bottom topography and oceanic environment and there are close correlations between the high content of chlorophyll-a and the light-nutrient environment.

关键词： Ph Th An analysis on the formation mechanism of the distributionof high content of chlorophyll-a in the continentalshelf edge waters of East china Sea high

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

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

Study on interaction between the coastal water, shelf water and Kuroshio water in the Huanghai Sea and East china Sea

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Acta Oceanologica Sinica 2003年第3期22卷 351-367页

作者： Binghuo Guo, Xiaomin Hu, Xuejun Xiong, Renfeng Ge first institute of oceanography, state oceanic administration, qingdao 2.6061, china state Ocean Adm Inst Oceanog 1 Qingdao 266061 Peoples R China

The main processes of interaction between the coastal water, shelf water and Kuroshio water in the Huanghai Sea (HS) and East china Sea (ECS) are analyzed based on the observation and study results in recent years. These processes include the intrusion of the Kuroshio water into the shelf area of the ECS, the entrainment of the shelf water into the Kuroshio, the seasonal process in the southern shelf area of the ECS controlled alternatively by the Taiwan Strait water and the Kuroshio water intruding into the shelf area, the interaction between the Kuroshio branch water, shelf mixed water and modified coastal water in the northeastern ECS, the water-exchange between the HS and ECS and the spread of the Changjiang diluted water.

关键词： Huanghai Sea East china Sea coastal water shelf water Kuroshio water interaction

The phytoliths in Core C_1 from the Okinawa Trough

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Chinese Science Bulletin 1997年第16期42卷 1377-1382页

作者： WANG Yongjifirst institute of oceanography, state oceanic administration, qingdao 266003, china first institute of oceanography State Oceanic Administration Qingdao China

THE application of phytolith study in geology in the world has experienced a history of over 30 years. The earliest application of phytolith study to marine geology was made by Smithson when he made a study on the submarine sediments in Leigwy Bay. Later, he made the analysis of phytoliths in the neritic sediments in Ariake Bay in Kyushu, Japan. Dumitrica analysed the phytoliths in the cores drilled in the Mediterranean Sea. Phytoliths in the deepsea

关键词： Okinawa Trough phytolith palaeoclimate.

Spatial and temporal variability of heat content above the thermocline in the tropical Pacific Ocean

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Acta Oceanologica Sinica 2003年第2期22卷 179-190页

作者： Pu Shuzhen, Yu Fei, Hu Xiaomin, Chen Xingrong first institute of oceanography, state oceanic administration, qingdao 2.6061,china, state Ocean Adm Inst Oceanog 1 Qingdao 266061 Peoples R China

Heat content of the upper layer above the 20℃ isotherm in the tropical Pacific Ocean isestimated by using the sea temperature data set with a resolution 2°latitude×5°longitude (1980-1993) for the water depths (every 10 m) from 0 m to 400 m, and its temporal and spatial variabilities are analyzed. (1) The temporal variability indicates that the total heat in the upper layer of the equatorial Pacific Ocean is characterized by the interannual variability. The time series of the equatorial heat anomaly 5 months lead that of the El Nino index at the best positive lag correlation between the two, and the former 13 months lag behind the latter at their best negative lag correlation. Therefore the equatorial heat content can be used as a better predictor than the El Nino index for a warm or cold event. In addition, it is also found that less heat anomaly in the equator corresponds to the stronger warm events in the period (1980- 1993) and much more heat was accumulated in the 4 years including 1992/1993 ENSO (1989-1993) than the 4 years including 1982/1983 ENSO (1980-1983); (2) The spatial variability indicates that the area with the highest lag correlation among the grids moves in an anti-clockwise circle in the northern tropical Pacific Ocean within 4 years period and in a clockwise circle in the southern tropical Pacific Ocean. This result provides scientific evidence for the quasi - cycle theory of El Nino events.

关键词： Heat content ENSO tropical Pacific Ocean

Threshold autoregression models for forecasting El Nino events

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Acta Oceanologica Sinica 1990年第1期9卷 61-67页

作者： Pu Shuzhen and Yu Huiling first institute of oceanography, state oceanic administration, qingdao, china

-In this paper, monthly mean SST data in a large area are used. After the spacial average of the data is carried out and the secular monthly means are substracted, a time series (Jan. 1951-Dec. 1985) of SST anomalies of the cold tongue water area in the eastern tropical Pacific Ocean is obtained. On the basis of the time series, an autoregression model, a self-exciting threshold autoregression model and an open loop autoregression model are developed respectively. The interannual variations are simulated by means of those models. The simulation results show that all the three models have made very good hindcasting for the nine El Nino events since 1951. In order to test the reliability of the open loop threshold model, extrapolated forecast was made for the period of Jan. 1986-Feb. 1987. It can be seen from the forecasting that the model could forecast well the beginning and strengthening stages of the recent El Nino event (1986-1987). Correlation coefficients of the estimations to observations are respectively 0. 84, 0. 88 and 0. 89. It is obvious that all the models work well and the open loop threshold one is the best. So the open loop threshold autoregression model is a useful tool for monitoring the SSTinterannual variation of the cold tongue water area in the Eastern Equatorial Pacific Ocean and for estimating the El Nino strength.

关键词： Nino EI SSTA Threshold autoregression models for forecasting El Nino events El

ON ESTIMATION OF WAVE ENERGY IN WAVE POWER GENERATION

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china Ocean Engineering 1987年第2期1卷 101-111页

作者： Wu Bijun(first institute of oceanography, state oceanic administration, qingdao) state oceanic administration Qingdao China State Oceanic Administration Qingdao China

In order to match the capacity of wave power generation equipment with the magnitude of wave force, it is necessary to understand the relatively accurate data of wave parameters. The wave energy needed in a specific sea area should be estimated to ensure the availability and the economical use of such equipment. This paper discusses the estimation method of wave energy. In addition, utilizing the statistical method of wave in other fields of engineering, a series of new graphs and data of wave measurement are deduced and the relation between steepness and wave energy are stated.

关键词： ON ESTIMATION OF WAVE ENERGY IN WAVE POWER GENERATION Wave

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