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The Statistical Distribution of the Horizontal Velocities of Water Particles at Wave Surface Maxima

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china ocean Engineering 1998年第3期13卷 359-364页

作者： GUAN Changlong Professor, institute of physical {2.ography, {2. university of qingdao, qingdao 2.6003, china. institute of physical {2.ography Ocean University of Qingdao Qingdao 266003 China

On the basis of the linear model of random sea waves presented by Longuet-Higgins, the statistical distribution of the horizontal velocities of water particles at wave surface maxima is derived theoretically. The derived distribution is similar to that of wave surface maxima, and a new spectral width epsilon(u), which is defined as (1 - m(3)(2./m(2.m(4))(1/2., is introduced in the distribution. When epsilon(u) tends to zero, the distribution is reduced to Rayleigh distribution and it is reduced to the normal distribution when epsilon(u) tends to unity. For a narrow spectrum, it is proved that epsilon is equal to 1/2.epsilon, where epsilon is (1 - m(2.(2./m(0)m(4))(1/2. and is the commonly used spectral width.

关键词： sea wave wave surface maxima horizontal velocity statistical distribution

Energy distributions of the large-scale horizontal currents caused by wind in the baroclinic ocean

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Science china Earth Sciences 2005年第12期48卷 2267-2275页

作者： ZHOU Lei1, TIAN Jiwei1 & WANG Dongxiao2.1. physical oceanography Laboratory, ocean university of china, qingdao 2.6003, china 2. Key Laboratory of Tropical Marine Environmental Dynamics, South china Sea institute of oceanology, Chinese Academy of Sciences, Guangdong 510301, china 1. physical oceanography Laboratory Ocean University of China 266003 Qingdao China 2. Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of Oceanology Chinese Academy of Sciences 510301 Guangdong China

ocean current data for nearly 3 months in the South china Sea (SCS), combined with the NCEP/NCAR reanalysis wind data, are analyzed. The results indicate that the wind en-ergy enters the upper mixed layer in a wide continuous frequency band. In addition, the interac-tion between the low-frequency wind anomaly and the low-frequency current anomaly is the most ‘effective’ way for the energy input from the wind to the upper ocean. However, only the inertial and the near inertial energy propagate downwards through the upper mixed layer. The down-ward-propagating energy is distributed into the barotropic currents, the baroclinic currents and each mode of the baroclinic currents following the normal distributions. The energy change ratios between the barotropic motion to the baroclinic motion induced by the wind present a normal distribution of N (0.02.2. 0.3947). The energy change ratios of the first 4 baroclinic modes to the whole baroclinic currents also follow the normal distributions. The first baroclinic mode follows N (0.2.2., 0.1872., the second N (0.1979, 0.1504), the third N (0.1331, 0.1633), and the fourth N (0.0650, 0.1540), respectively.

关键词： wind anomaly, ocean current anomaly, energy transportation, wide frequency band, near-inertial fre-quency, energy distribution.

The three-layer model of the thermohaline structure in the shallow seas

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Acta oceanologica Sinica 1993年第3期12卷 323-334页

作者： Yang Dianrong institute of physical {2.ography ,{2. university of qingdao,qingdao 2.6003, china

A three-layer model of the thermohaline structure is developed on the basis of the two -layer model of thermocline. The model is able to simulate the depth,thickness and intensity of both thermocline and halocline, and the temperature and salinity of both upper layer and lower layer in the shallow *** of simulation with data is *** analysis is made on a variety of factors affecting the intensity of the thermocline.

关键词： Three-layer model thermocline shallow sea

A model study on carbon cycle and phytoplankton dynamical processes in the Bohai Sea

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Acta oceanologica Sinica 2003年第1期22卷 47-56页

作者： WeiHao ZhaoLiang FengShizuo instituteofphysical{2.ography OceanUniversityofChina(OceanUniversityofQingdao)Qingdao266003China physicaloceanographyKeyLabofStateEducationMinistry OceanUniversityofChina(OceanUnivrsityofQingdao)Qingdao266003China

The carbon cycle of lower trophic level in the Bohai Sea is studied with a three-dimensional biological and physical coupled model. The influences of the processes (including horizontal advection, river nutrient load, active transport etc. ) on the phytoplankton biomass and its evolution are estimated. The Bohai Sea is a weak sink of the CO2.in the atmosphere. During the cycle, 13.7% of the gross production of the phytoplankton enter the higher trophic level and 76.8 % of it are consumed by the respiration itself. The nutrient reproduction comes mainly from the internal biogeochemical loop and the rem-ineralization is an important mechanism of the nutrient transfer from organic form to inorganic. Horizontal advection decreases the total biomass and the eutrophication in some sea areas. Change in the nutrient load of a river can only adjust the local system near its estuary. Controlling the input of the nutrient, which limits the alga growth, can be very useful in lessening the phytoplankton biomass.

关键词： Carbon cycle phytoplankton dynamics the Bohai Sea

Numerical analysis of the sea (lake ) breeze dynamics and initialization of the model

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Acta oceanologica Sinica 1989年第4期8卷 535-547页

作者： Wu Zengmao institute of physical {2.ography, {2. university of qingdao, Oingdao. china Inst. physical oceanography Ocean Univ. of Qingdao Qingdao China. China

In this paper, analysed are the effects of synoptic wind, earth-rotation inertia and land surface roughness on sea (lake) breeze process, on the basis of the calculated results of a 2.D primitive equation model with turbulent energy closure. The results show that a moderate background wind field acts as a trigger for sea (lake) breeze onset, and presents prominent effect on the breeze intensity, inland advance rate and structure feature. The effects of Coriolis force not only make the breeze veering round, but also damp the development of the breeze component normal to *** paper also discussed the dynamic method of wind field initialization based on one-site radiosonde. Three approaches of initialization have been tested. In comparison, it was found that the approach of one-dimensional dynamic initialization with nudging term was preferable to the others.

关键词： lake Numerical analysis of the sea

Disturbance evolution and the nonlinear stability to the basic flows for two-dimensional quasi-geostrophic motion

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Chinese Science Bulletin 1999年第13期44卷 1179-1184页

作者： SONG Shiji and LIU QinyuWeihai College , Harbin institute of Technology , Weihai 2.42.9, china institute of physical oceanography , ocean university of qingdao , qingdao 2.6003 , china Weihai College Harbin Institute of Technology Weihai China institute of physical {2.ography Ocean University of Qingdao Qingdao China

The status of disturbances of both initial values and parameters in the models is further investigated, the exact explicit estimates on the disturbance energy and disturbance potential enstrophy are given; and while the initial disturbance fields rely only on the initial disturbance potential enstrophy, initial disturbance velocity circulation along the boundary, disturbance parameters, and the nonlinear stability criteria paralleling to Arnold’s second theorem are obtained, and the main results of Mu are generalized.

关键词： two-dimensional quasi-geostrophic motion disturbances of both initial values and parameters stability.

A numerical study of summertime expansion pattern of Changjiang (Yangtze) River diluted water

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Acta oceanologica Sinica 2009年第3期28卷 11-16页

作者： SHAN Feng QIAO Fangli XIA Changshui College of physical and Environmental oceanography Ocean University of China Qingdao Qingdao 266003 China First institute of oceanography State Oceanic Administration Qingdao 266061 China

Observations show that during summer especially in August, the northward expansion of the Changjiang（Yangtze） River diluted water （CRDW） is blocked in the vicinity of the Changjiang Estuary. To explain this phenomenon, Princeton ocean model （POM） is applied to simulate the summertime expansion pattern of CRDW. Numerical experiments show that to the north of the Changjiang Estuary, a tide-induced temperature front of a cold water centered at （34°N, I2..5°E） plays the key role in determining the expansion pattern of CRDW. This front splits the CRDW into two parts： the main part expands northeastward, and the other small part expands northwestward off the coast of Jiangsu Province, china.

关键词： Changjiang River diluted water Princeton ocean model expansion dynamics

Cross thermocline mixing effect due to tide in the shallow sea

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Acta oceanologica Sinica 1992年第1期11卷 1-11页

作者： Yang Dianrong, Zhou Dejian Zhang Yulin institute of physical {2.ography, {2. university of qingdao, qingdao 2.6003, china

Using the data specially observed on the Bohai Sea oil platform by the authors for studying thermocline for two weeks, the thermocline depth, the temperature and the salinity of the layers below and above the thermocline were numerically modelled. The model is based on the Stigebrandt model and some important supplements are made in this paper in accordance with the local condition of the sea. The modelling results fit well in the observations. It is proved that the entrainmem due to both the tide and the wind can give rise to rather intense mixing cross the thermocline. This process makes the temperature rising below the thermocline,and causes the nutrient increasing above it,which has important significance for the marine physical environment and the marine organism.

关键词： shallow mixing salinity Bohai accordance intense nutrient numerically turbulent modelling

An infinity of conservation laws of fKdV equation

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Acta oceanologica Sinica 1997年第1期16卷 19-28页

作者： Xu Zhaoting, Xu Yu and Tian Jiwei institute of physical {2.ography and physical {2.ography Laboratory, {2. university of qingdao, qingdao 2.6003, china institute of physical {2.ography Physical Oceanography Laboratory Ocean University of Qingdao Qingdao 266003 China

An infinity of conservation laws of fKdV equation is derived in terms of the Miura and Gardner's transform. The pseudo-mass and energy theorems are studied by the first two conservation laws. As a typical example, the theoretical mean wave resistance and the regional distribution of energy of the precursor soliton generation are determined by means of the first and the second conservation laws.

关键词： Precursor soliton of fKdV equation an fKdV equation an infinity of conservation laws