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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 Oceanography and Physical Oceanography laboratory, Ocean University of qingdao, qingdao 2.6003, china 2. key laboratory of marine science and numerical modeling of state oceanic administration, qingdao 266061, china) Institute of Physical Oceanography and Physical Oceanography laboratory，Ocean University of qingdao，qingdao 2.6003，china key laboratory of {2. science and numerical modeling of state oceanic administration，qingdao 266061，china Institute of Physical Oceanography and Physical Oceanography laboratory，Ocean 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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黄海、东海表、上层实测流分析

海洋学报 2002年第2期24卷 9-19页

作者：林葵汤毓祥郭炳火国家海洋局第一海洋研究所海洋环境科学和数值模拟国家海洋局重点实验室山东青岛266061

根据迄今为止所获得的142.锚碇浮标和58套卫星跟踪漂流浮标的大范围测流资料,综合分析了黄海、东海表、上层环流.研究结果更加清晰、形象、直观地展示了黑潮及其向对马暖流的分支,台湾暖流的分叉,和黄海暖流、长江冲淡水及涡旋发达海... 详细信息

根据迄今为止所获得的142.锚碇浮标和58套卫星跟踪漂流浮标的大范围测流资料,综合分析了黄海、东海表、上层环流.研究结果更加清晰、形象、直观地展示了黑潮及其向对马暖流的分支,台湾暖流的分叉,和黄海暖流、长江冲淡水及涡旋发达海区的若干主要特征.

关键词：黄海东海流场结构环流特征黑潮海流

THE VERTICAL THERMAL STRUCTURE OF THE INDIAN OCEAN DIPOLE MODE FROM WOCE DATA

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Journal of Hydrodynamics 2001年第3期13卷 24-27页

作者： Yu Wei-dong key laboratory of {2. science and numerical modeling, state oceanic administration, First Institute of Oceanography, qingdao 266061, china First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

The Dipole Mode in tropical Indian Ocean (DMI) is a newly verified independent internal mode of atmosphere ocean system in Indian Ocean. Its surface manifestation is illustrated in detail with the aid of the historical data sets. But relatively few is known about its vertical characteristics. Here the vertical thermal structure of DMI is analyzed using the newly released WOCE GLOBAL DATA (V2.0). Attention is focused on the comparison of the abnormal upper ocean thermal structure along one section with the normal state in year 1990 respectively in two cases: in year 1994 when there was IDM but no E1 Nino and in year 1997 when there were DMI and also E1 Nino. This may shed light on the further theoretical and numerical study of IDM.

关键词： DMI thermal structure

THE RE-DERIVATION OF THE VORTICITY EQUATION OF THE LAYERED FLOW OF THE SHALLOW SEA

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Journal of Hydrodynamics 2001年第3期13卷 10-16页

作者： Zhang Qing-hua, Li Jian ke, Qu Yuan yuan First Institute of Oceanography, state oceanic administration, qingdao 266061,{2. key laboratory of marine science and numerical modeling, state oceanic administration, qingdao 266061,{2. First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

The scale analysis of the layered flow problem of the shallow sea shows that the parameter of E V represented the relative thickness of the friction layer is the little value larger than Rossby number. This illustrates that they are not ignorable and the important control factors of the layered flow although friction effect is only limited within interface Ekman layer and bottom Ekman layer. Using larger little parameter E V as the little perturbation parameter is more reasonable than using the classical Rossby number ε. By using the perturbation expansion and doing the researches of the structure of the Ekman layer on the sea surface, sea bottom and interface, a group of new layered flow vorticity equation is derived. It combines the vorticity of the flow of every layer, the inclination of the interface, the inclination of the sea bottom and the wind stress vorticity on the sea surface. Different from the conventional vorticity equation, which derived by using Rossby number as little parameter and is applied to large scale motion, it allows relatively large interfaces fluctuation, even it is applied to the problem that interface touch the bottom or touch the sea surface.

关键词： interface Ekman layer interface fluctuation touch the bottom touch the sea surface

AN EXTENDED modeling OF TIDE-WAVE MOTION

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Journal of Hydrodynamics 2001年第3期13卷 100-106页

作者： Zhang Qing hua, Xu Hao, Qu Yuan yuan First Institute of Oceanography, state oceanic administration, qingdao 266061,{2. key laboratory of marine science and numerical modeling, state oceanic administration, qingdao 266061,{2. First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

By vertical boundary conditions, a spectral expansion of horizontal tide wave velocity is done in vertical direction in terms of a complete basis functions selected properly, hence a relation between tide levels and spectral components is found theoretically under condition of ignoring the horizontal friction stress and nonlinear effect. And a relation between bottom friction of tide current, which satisfies the viscous condition on sea bottom, and tide levels is determined. The relation is different from the relation of the traditional parameterizing of bottom friction. Moreover integration of the continuity equation and momentum equations is carried out in the vertical direction using zero flux condition on solid boundaries and inputting condition on open boundaries, and then a boundary value problem of elliptic form on the tide levels is constructed.

关键词： tide waves basis function spectral expansion bottom friction

The relationship between sea surface temperature anomaly and wind energy input in the Pacific Ocean

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Progress in Natural science:Materials International 2009年第10期19卷 1409-1412页

作者： Chuanjiang Huang,Fangli Qiao key laboratory of {2. sciences and numerical modeling,The First Institute of Oceanography,state oceanic administration,qingdao 266061,china key laboratory of {2. sciences and numerical modeling The First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

The relationship between sea surface temperature anomaly(SSTA) and wind energy input in the Pacific Ocean over the period of 1949-2.03 is studied by using daily-mean NOAA/NCEP wind stress and monthly mean Reynolds SST *** results indicate the strong negative correlation between SSTA and local wind energy input to surface waves in most of the domain at low and middle *** SST is low(high) during the years with more(less) wind energy *** correlation coefficients are high in the central and eastern tropical Pacific and the central midlatitude North Pacific at the decadal scale,and in the central tropical Pacific at the interannual *** mixing processes in the upper ocean are closely associated with wind energy input,indicating that wind energy input may play an important role in interannual and decadal variability in the Pacific Ocean via regulating vertical mixing.

关键词： Wind energy Interannual and decadal variability SSTA Vertical mixing

SIMULATION STUDY OF IMAGING OF UNDERWATER BOTTOM TOPOGRAPHY BY SYNTHETIC APERTURE RADAR

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Journal of Hydrodynamics 2001年第3期13卷 57-64页

作者： Ma, Yi Zhang, Jie First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

Interaction between current and underwater bottom topography modulates roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the mechanism, this paper presents a simulation model for Synthetic Aperture Radar (SAR) imaging of underwater bottom topography. The numerical simulations experiments were made using the Princeton Ocean Model (POM) and analytical expression theory of SAR Image in Mischief sea area. It is concluded that the SAR image is better visual when water depth of underwater bottom topography is shallow or gradient of underwater bottom topography is high.

关键词： numerical analysis Ocean currents Simulation Synthetic aperture radar Underwater imaging Underwater structures

EI NIO PHENOMENON AND EXTENDED ASSOCIATE PATTERN ANALYSIS

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Journal of Hydrodynamics 2004年第1期16卷 90-100页

作者： CUIMao-chang MOJun QIAOFang-li InstituteofOceanology ChineseAcademyofSciences.Qingdao266071China／KeyLaboratoryofMarineScienceandNumericalmodelingTheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China. InstituteofOceanology ChineseAcademyofSciences.Qingdao266071China keylaboratoryof{2.scienceandnumericalmodeling TheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China

To study the causes of El Nino Phenomenon the Extended Associate PatternAnalysis (EAPA) is set up with monthly sea surface wind stress and precipitation besides Sea LevelPressure (SLP) and Sea Surface Temperature (SST) in or over the Pacific and related seas since 1979in present paper. The results show that El Nino Phenomenon means a SST redistribution, coveringalmost the whole Pacific that needs a huge amount of energy provided by air-sea interaction in themost Pacific regions; It is the wester burst and wind convergence, coming from meddle latitudesdirectly, instead of Kelvin waves that produce the strong SST warm signal in Nino regions; Twonegative SLP anomalies in middle of the North and South Pacific, most likely produced by the averageair pressure decreasing effect of explosive cyclones through precipitation, and the positive SLPanomaly o-ver the Asia-Australia land bridge, coming mainly from the south hemisphere with a littleinfluence from the Asian continent, are the three major causes for El Nino onset, they work togetherto produce anomalous wind convergence in Nino regions and wester burst in middle of the North andSouth Pacific that result in a warm tongue and cold pincers gearing together; Basically, during itsearly stage the ocean is forced by the atmosphere, while during its late stage the atmosphere isforced by the ocean.

关键词： extended associate pattern analysis (EAPA) El nino phenomenon

The coupling instability of Rossby and topographic Rossby waves in the equatorial area

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science china Earth sciences 2005年第10期48卷 1792-1801页

作者： CHAO Jiping1,2. LIU Lin1,3 & YU Weidong1 1. laboratory of marine {2. and numerical modeling, state oceanic administration, qingdao 266061, china 2. National Research Center for marine Environmental Forecasts, state oceanic administration, Beijing 100081, china 3. Ocean University of china, {12. 2.6003, china state oceanic {2. Ocean University of china

In case of considering the fact that the tropical ocean thermocline or the lower at-mosphere height field has the meridional variation, the topographic Rossby wave will be excited. Also the background geostrophic current emerges. Under such conditions, the topographic Rossby wave can interact with the classical Rossby wave at some parameter band and thus brings a new kind of instability, which may be of potential application in understanding some phenomena of the ENSO cycle.

关键词： thermocline variation, equatorial jet, Rossby wave, topographic Rossby wave, coupling instability