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南海西南海域中尺度涡传播特征分析

中国海洋大学学报（自然科学版） 2024年第6期54卷 1-10页

作者：张舒妍裘是郭佳祺张哲恩陈学恩中国海洋大学海洋与大气学院山东青岛266100

本文依据越南离岸流等将该海域分为南北两部分,基于1993年1月1日—2020年12月31日的海平面异常卫星高度计数据,追踪了南海西南海域中尺度涡的传播轨迹,研究了中尺度涡的传播特征。结果表明:北部区域气旋涡传播方向更易沿等深线传播,反... 详细信息

本文依据越南离岸流等将该海域分为南北两部分,基于1993年1月1日—2020年12月31日的海平面异常卫星高度计数据,追踪了南海西南海域中尺度涡的传播轨迹,研究了中尺度涡的传播特征。结果表明:北部区域气旋涡传播方向更易沿等深线传播,反气旋涡更易跨地形由深水向浅水运动;北部区域冬半年(秋分至春分)会有更多的气旋涡偏北向运动,更多反气旋涡偏南向运动,夏半年(春分至秋分)则会有更多的反气旋涡偏北向运动,更多的气旋涡偏南向运动;南部区域夏半年反气旋涡的传播路径最为独特,主要向东北方向运动,气旋涡则主要向西南方向运动,二者方向完全相反。本文研究结果可为全面了解南海旋涡的传播及其物理机制提供支撑。

关键词：南海西南海域中尺度涡传播特征统计特征

Numerical investigation of the South China Sea deep circulation

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Acta Oceanologica Sinica 2022年第5期41卷 1-11页

作者： Shengquan Tang xueen chen Zhi Zeng Xin Liu College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao266100China Shandong Computer Science Center(National Supercomputer Center in Jinan) Qilu University of Technology(Shandong Academy of Sciences)Jinan250014China College of Meteorology and Oceanography National University of Defense TechnologyChangsha410073China

Based on a two-level nested model from the global ocean to the western Pacific and then to the South China Sea(SCS),the high-resolution SCS deep circulation is numerically *** SCS deep circulation shows a basin-scale cyclonic structure with a strong southward western boundary current in summer(July),a northeast-southwest through-flow pattern across the deep basin without a western boundary current in winter(January),and a transitional pattern in spring and *** sensitivity model experiments illustrate that the Luzon Strait deep overflow is the main factor controlling the seasonal variation in the SCS deep *** SCS surface wind can significantly influence the SCS deep circulation in *** Luzon Strait deep overflow transport from the Pacific into the SCS ranges from 0.68×10^(6) m^(3)/s to 1.83×10^(6) m^(3)/s,reaching its maximum in summer(July,up to 1.83×10^(6) m^(3)/s),less in autumn and winter,and the minimum in spring(May,0.68×10^(6) m^(3)/s).In summer,the strong Luzon Strait deep overflow dominates the SCS deep circulation when the role of the SCS surface wind is *** winter,the weaker Luzon Strait deep overflow and SCS surface wind jointly drive the SCS deep circulation into a northeast-southwest through-flow *** potential vorticity(PV)dissipation in the SCS deep basin reaches its maximum(−0.122 m^(2)/s^(2))in May and its minimum(−0.380 m^(2)/s^(2))in July.

关键词： South China Sea deep sea circulation deep overflow surface wind potential vorticity

A numerical study of generation and propagation of type-a and type-b internal solitary waves in the northern South China Sea

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Acta Oceanologica Sinica 2019年第11期38卷 20-30页

作者： Zhi Zeng xueen chen Chunxin Yuan Shengquan Tang Lequan Chi College of Oceanic and Atmospheric Sciences Ocean University of China

Numerical simulations based on a high-resolution three-dimensional MIT general circulation model(MITgcm)using realistic topography and tidal forcing are conducted to investigate the generation and propagation of the so-called type-a waves(large-amplitude rank-ordered wave packets)and type-b waves(isolated wave packets)in the northern South China *** first,we summarized and analyzed the generation and propagation characteristics of these ***,energy budget at the Luzon Strait is *** generation has three local maxima every day,of which the largest one corresponds to the emergence of the type-a *** flux at the west boundary of the Luzon Strait shows two local maxima each *** larger one is consistent with the generation of the type-a wave and the smaller one is in correspondence with the generation of the type-b *** experiments are designed to explore the role of the east and west ridge of the Luzon Strait on the generation and propagation of the type-a and type-b *** is found that the east ridge is indispensable on the generation of the type-a wave while the west ridge has little *** west ridge diminishes the type-a waves'amplitude but hardly changes their propagation *** type-b waves also come from perturbation signals which originate from the east ridge and are enhanced in amplitude and reduced in propagation speed by the west ridge.

关键词： numerical simulation internal solitary wave type-a wave type-b wave Luzon Strait

Assimilation of surface currents into a regional model over Qingdao coastal waters of China

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Acta Oceanologica Sinica 2013年第7期32卷 21-28页

作者： ZHAO Jian chen xueen XU Jiangling HU Wei chen Jinrui Pohlmann Thomas College of Physical and Environmental Oceanography Ocean University of China North China Sea Brach State Oceanic Administration University of Hamburg

Surface currents measured by high frequency （HF） radar arrays are assimilated into a regional ocean model over Qingdao coastal waters based on Kalman filter method. A series of numerical experiments are per- formed to evaluate the performance of the data assimilation schemes. In order to optimize the analysis pro- cedure in the traditional ensemble Kalman filter （ENKF）, a different analysis scheme called quasiensemble Kaman filter （QENKF） is proposed. The comparisons between the ENKF and the QENKF suggest that both them can improve the simulated error and the spatial structure. The estimations of the background error covariance （BEC） are also assessed by comparing three different methods： Monte Carlo method; Canadian quick covariance （CQC） method and data uncertainty engine （DUE） method. A significant reduction of the root-mean-square （RMS） errors between model results and the observations shows that the CQC method is able to better reproduce the error statistics for this coastal ocean model and the corresponding external forcing. In addition, the sensibility of the data assimilation system to the ensemble size is also analyzed by means of different scales of the ensemble size used in the experiments. It is found that given the balance of the computational cost and the forecasting accuracy, the ensemble size of 50 will be an appropriate choice in the Qingdao coastal waters.

关键词： Qingdao coastal waters surface currents Ensemble Kalman filter Finite Volume Coastal OceanModel (FVCOM)

Numerical investigation of wave propagation in the Liverpool Bay,NW England

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Acta Oceanologica Sinica 2011年第5期30卷 1-13页

作者： LI Ming RAYMOND Ip WOLF Judith chen xueen BURROWS Richard School of Engineering University of Liverpool Liverpool L69 3GQ UK National Oceanography Centre Joseph Proudman Building Liverpool L3 5DA UK College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China

The computer model for near shore wave propagation,SWAN,was used to study wave climates in Liverpool Bay,northwest England with various input parameters,including bottom friction factor,white capping,wind drag formulation and effects of tidal *** were compared with in-situ measurements and reveal the impacts from these inputs on the predictions of wave height and propagation *** particular,the model results were found very sensitive to different input formulations,and tend to underestimate the wave parameters under storm conditions in comparison with the *** is therefore important to further validate the model against detailed field measurements,particularly under large storms that are often of the primary concern.

关键词： coastal engineering flooding wave model near shore tide

Numerical study of current fields near the Changjiang Estuary and impact of Quick-EnKF assimilation

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Acta Oceanologica Sinica 2011年第5期30卷 33-44页

作者： chen xueen ZHAN Peng chen Jinrui QIAN Hongbao College of Physical and Environmental Oceanography Ocean University of China Qingdao 266100 China Administrative Center for China＇s Agenda 21 Beijing 100038 China

A 30-d current numerical simulation is running for the Yangshan Port,the Changjiang Estuary,the Hangzhou Bay and their adjacent seas using a finite volume coastal ocean model （FVCOM）,with Changjiang River runoff and wind effect being *** the open boundary,this model is driven by the water level obtained from prediction including eight main partial *** the harmonic analysis,the cotidal chart and the iso-amplitude line as well as the current ellipse distribution map are displayed to illustrate the propagation property of a tidal *** velocity of both the U and V components coincides with the actual measurement,which shows that the model result is credible to describe the hydrodynamic pattern in this sea *** this basis,real-time current data from high-frequency radar is assimilated with the implementation of quick ensemble Kalman filter,which takes the variation tendency of the state vector to compute the analysis field,instead of integrating the field for N （the number of ensemble） times as it used to in the standard EnKF,aiming at raising the efficiency of computation,reducing the error of prediction and at the same time,improving the forecast effect.

关键词： Yangshan Port finite volume coastal ocean model current quick ensemble Kalman filter assimilation

A novel high resolution model without open boundary conditions applied to the China Seas: first investigation on tides

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Acta Oceanologica Sinica 2010年第6期29卷 12-25页

作者： YU Huaming chen xueen BAO Xianwen Thomas Pohlmann WU Dexing Institute of Physical Oceanography Ocean University of China Qingdao 266100 China Institute of Oceanography Centre for Marine and Climate Research University of Hamburg Hamburg 20146 Germany

We developed a Global Ocean Circulation and Tide Model （GOCTM） with coarse grids in the open deep ocean degrading ‘smoothly’ into the highly resolved China Seas （CS） of refined grids to study the tides and circulation *** is based on the framework of the Finite Volume approach for better mass conservation through improved transports across the discrete individual control *** also takes a full advantage of the geometric flexibility of unstructured mesh using a realistic global topography including the Arctic *** CS are given a special focus by refining the unstructured grids,but they are embedded into global domain ***,GOCTM not only successfully avoids the treatment of the open boundaries,but also optimizes the trade-off between computational cost and model ***,GOCTM is driven by the astronomical tide-generating potential and the secondary tide-generating potential directly,together with the wind stress and heat *** succeeds in reproducing the global eight principal tidal harmonic ***,the simulated tidal results in the CS are improved compared to some other regional models with the discrepancy of 3.9 cm for M 2 *** idea of GOCTM can also be referred for other regional ocean study.

关键词： finite volume model GOCTM open boundary conditions the China Seas

Sea Experiments of the Underway Conductivity-Temperature-Depth Prototype Made in China

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Journal of Ocean University of China 2009年第4期8卷 409-415页

作者： SONG Xiangzhou LI Hui LIN Xiaopei chen xueen GUO Xinshun TIAN Jiwei Physical Oceanography Laboratory Ocean University of China Qingdao 266100 P. R. China National Ocean Technology Center Tianjin 300112 P. R. China Research Vessel Centre Ocean University of China Qingdao 266100 P. R. China

A new instrument for upper ocean survey, namely the UCTD (Underway Conductivity-Temperature-Depth), which combines some of the advantages of other underway instruments, is introduced in this paper. The Introduction section presents a description of the construction and function of the UCTD, and the experiments conducted in the South China Sea on board the R/V Dong Fang Hong 2 in July 2007 and August 2008. The UCTD system, with pressure and temperature sensors in the probe, is con- veniently portable, cost-effective and environment-friendly. It is hopefully suitable for future cruises. An intercomparison based on regressing with the experiment temperature data from both SeaBird plus911 CTD and the UCTD showed that the standard deviation is 0.88℃ and the correlation coefficient is 0.96, achieving the goals set for the current oceanography uses. In the hydrodynamic experiments, the descending velocities and depths were calculated for different ship speeds. A pulling test was designed with a tensiometer to measure the magnitude of the pull. The maximal tension of the line was found to be 66.2 kg, which is far lower than the bearing limit of the Hollow Spectra line. Finally, some improvement suggestions are put forward for future experiments and production.

关键词：流体力学实验电导率原型制造中国海温上层海洋温度数据下降速度

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不同参数模型对南黄海典型台风的适用性研究

海洋湖沼通报 2022年第2期44卷 8-16页

作者：刘涛陈学恩陈子健中国海洋大学海洋与大气学院山东青岛266100

本文选取南黄海及其邻近海域作为研究区域,对1970—2016年经过此区域的台风进行了统计和分析。研究发现,南黄海区域的台风发生频率较高,但时间集中且路径类型复杂多样,常见路径为登陆转向型和近海北上型。基于上述两种常见路径,本文选择... 详细信息

本文选取南黄海及其邻近海域作为研究区域,对1970—2016年经过此区域的台风进行了统计和分析。研究发现,南黄海区域的台风发生频率较高,但时间集中且路径类型复杂多样,常见路径为登陆转向型和近海北上型。基于上述两种常见路径,本文选择3个典型台风,对比多种台风气压分布模型和台风移行风场模型,进行了台风风场的构造,并将模拟结果与实测风速对比,讨论各模型组合对南黄海典型台风的适用性。误差表明,藤田高桥嵌套气压分布模型和Jelesnianski移行风场模型的组合方案对近海北上型路径的201109号台风梅花和201007号台风圆规的模拟效果最好;Myers气压分布模型和宫崎正卫移行风场模型的组合方案对登陆转向型路径的201509号台风灿鸿的模拟效果最好。

关键词：南黄海台风风场模型台风气压分布模型