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Interbasin exchanges and their roles in global ocean circulation:A study based on 1 400 years' spin up of MOM4p1

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Acta Oceanologica Sinica 2014年第1期33卷 11-23页

作者： zhu yaohua WEI Zexun FANG Guohong WANG Yonggang GUAN Yuping Key Laboratory of Marine Science and Numerical Modeling First Institute of Oceanography State Oceanic Administration State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences

A global prognostic model based on MOM4p1,which is a primitive equation nonBoussinesq numerical model,has been integrated with 1 400 years from the state of rest based on the realistic topography to study the long-term pattern of combined wind-driven and thermodynamically-driven general *** model is driven by monthly climatological mean forces and includes 192×189 horizontal grids and 31 pressure-based vertical *** main objective is to investigate the mass and heat transports at interbasin passages and their compensations and roles in the global ocean circulation under equilibrium state of long-term spin *** kinetic energy analysis divides the spin up process into three stages：the quasi-stable state of wind driven current,the growing phase of thermodynamical circulation and the equilibrium state of thermohaline *** is essential to spin up over a thousand years in order to reach the thermohaline equilibrium state from a state of *** Arctic Throughflow from the Bering Strait to the Greenland Sea and the Indonesian Throughflow（ITF） are captured and examined with their compensations and existing *** reveals that the slope structures of sea surface height are the dynamical driving mechanism of the Pacific-Arctic-Atlantic throughflow and *** analysis denotes,in spite of O（1.4×106m3/s） of the southward volume transport in the northern Atlantic,that there is still O（1 PW） of heat transported northward since the northward currents in the upper layer carry much higher temperature water than the southward flowing northern Atlantic deep water（NADW）.Meridional volume and heat transports are focused on the contributions to NADW renewals and Atlantic meridional overturning circulation（AMOC）.Quantitative descriptions of the interbasin exchanges are explained by meridional compensations and supported by previous observations and numerical modeling *** indicates that the volume and heat exchanges on the interbasin passa

关键词： numerical modeling global ocean interbasin exchange meridional transport meridional over-turning circulation

The annual mean sketches and climatological variability of the volume and heat transports through the inter-basin passages:A study based on 1 400-year spin up of MOM4p1

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Acta Oceanologica Sinica 2014年第9期33卷 12-24页

作者： zhu yaohua WEI Zexun WANG Yonggang GUAN Yuping WANG Xinyi Key Laboratory of Marine Science and Numerical Modeling First Institute of Oceanography State Oceanic Administration State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences

The annual mean volume and heat transport sketches through the inter-basin passages and transoceanic sections have been constructed based on 1400-year spin up results of the MOM4p 1. The spin up starts from a state of rest, driven by the monthly climatological mean force from the NOAAWorld Ocean Atlas （1994）. The volume transport sketch reveals the northward transport throughout the Pacific and southward transport at all latitudes in the Atlantic. The annual mean strength of the Pacific-Arctic-Atlantic through flow is 0.63x106 m3/s in the Bering Strait. The majority of the northward volume transport in the southern Pacific turns into the Indonesian through flow （ITF） and joins the Indian Ocean equatorial current, which subse- quently flows out southward from the Mozambique Channel, with its majority superimposed on the Ant- arctic Circumpolar Current （ACC）. This anti-cyclonic circulation around Australia has a strength of 11 x 106 ms /s according to the model-produced result. The atmospheric fresh water transport, known as P-E^R （pre- cipitation minus evaporation plus runoff）, constructs a complement to the horizontal volume transport of the ocean. The annual mean heat transport sketch exhibits a northward heat transport in the Atlantic and poleward heat transport in the global ocean. The surface heat flux acts as a complement to the horizontal heat transport of the ocean. The climatological volume transports describe the most important features through the inter-basin passages and in the associated basins, including： the positive P-E＋R in the Arctic substantially strengthening the East Greenland Current in summer; semiannual variability of the volume transport in the Drake Passage and the southern Atlantic-Indian Ocean passage; and annual transport vari- ability of the ITF intensifying in the boreal summer. The climatological heat transports show heat storage in July and heat deficit in January in the Arctic; heat storage in January and heat deficit in July in the

关键词： volume transport heat transport global ocean circulation inter-basin passages climatologicalvariability

Vertical velocity and transport in the South China Sea

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Acta Oceanologica Sinica 2022年第7期41卷 13-25页

作者： yaohua zhu Dingqi Wang Yonggang Wang Shujiang Li Tengfei Xu Zexun Wei First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao266061China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao266100China

Deep water in the South China Sea is renewed by the cold and dense Luzon Strait ***,from where and how the deep water upwells is poorly understood *** on the Hybrid Coordinate Ocean Model reanalysis data,vertical velocity is derived to answer these ***-integrated vertical velocity is of two maxima,one in the shallow water and the other at depth,and separated by a layer of minimum at the bottom of the *** analysis shows that this two-segmented vertical transport is attributed to the vertical compensation of subsurface water to the excessive outflow of shallow water and upward push of the dense Luzon Strait overflow,*** the abyssal basin,the vertical transport increases upward from zero at the depth of 3500–4000 m and reaches a maximum of 1.5×10^(6) m^(3)/s at about 1500 *** water upwells mainly from the northeastern and southwestern ends of the abyssal basin and off the continental *** explain the upward velocity arising from slope breaks,a possible mechanism is proposed that an onshore velocity component can be derived from the deep western boundary current above steep slopes under bottom friction.

关键词： vertical velocity vertical transport Luzon Strait overflow South China Sea

A fresh look at the deepwater overflow in the Luzon Strait

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Acta Oceanologica Sinica 2017年第5期36卷 1-8页

作者： zhu yaohua SUN Junchuan WEI Zexun WANG Yonggang FANG Guohong QU Tangdong Key Laboratory of Marine Science and Numerical Modeling The First Institute of OceanographyState Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Joint Institute for Regional Earth System Science and Engineering University of California

On the basis of the latest version of a U.S. Navy generalized digital environment model （GDEM-V3.0） and World Ocean Atlas （WOA13）, the hydraulic theory is revisited and applied to the Luzon Strait, providing a fresh look at the deepwater overflow there. The result reveals that：（1） the persistent density difference between two sides of the Luzon Strait sustains an all year round deepwater overflow from the western Pacific to the South China Sea （SCS）; （2） the seasonal variability of the deepwater overflow is influenced not only by changes in the density difference between two sides of the Luzon Strait, but also by changes in its upstream layer thickness; （3） the deepwater overflow in the Luzon Strait shows a weak semiannual variability; （4） the seasonal mean circulation pattern in the SCS deep basin does not synchronously respond to the seasonality of the deepwater overflow in the Luzon Strait. Moreover, the deepwater overflow reaches its seasonal maximum in December （based on GDEM-V3.0） or in fall （October-December, based on the WOA13）, accompanied by the lowest temperature of the year on the Pacific side of the Luzon Strait. The seasonal variability of the deepwater overflow is consistent with the existing longest （3.5 a） continuous observation along the major deepwater passage of the Luzon Strait.

关键词： Luzon Strait deepwater overflow seasonal variability South China Sea

Variability of the deep South China Sea circulation derived from HYCOM reanalysis data

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Acta Oceanologica Sinica 2022年第7期41卷 54-64页

作者： yaohua zhu Guojiao Cao Yonggang Wang Shujiang Li Tengfei Xu Dingqi Wang Fei Teng Zexun Wei First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao266061China Navigation College Jiangsu Maritime InstituteNanjing211100China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao266100China

This study aims to investigate variability of the deep South China Sea(SCS)circulation using the Hybrid Coordinate Ocean Model(HYCOM)global reanalysis *** results reveal that annual cycle is a dominant component in the deep SCS ***,the boundary circulation strength is the weakest in January and peaks between June and *** eastern and southern boundary currents strengthen/weaken one to three months earlier than that in the western and northern *** Empirical Orthogonal Functions(VEOF)analysis results reveal that semiannual and intraseasonal fluctuations are significant components,of which the spatial patterns are mainly confined in the northern and western boundary areas as well as the southwestern *** analysis results show the strength of significant fluctuation varies year to *** analysis results indicate a decadal weakening in the deep SCS *** anomalous anticyclonic circulation,50–70 km apart from the slope break,tends to weaken the cyclonic boundary circulation in the western and northern boundaries as well as the southwestern *** trend is similar to the observed decadal weakening in the North Atlantic deep ***,the findings of this study reveal that the variation of the deep SCS circulation has a remarkable response to the climate *** mechanisms responsible for the variation are worth pursuing if more observations are available.

关键词： South China Sea variability of deep circulation HYCOM data VEOF analysis wavelet analysis

Effects of Electropulsing Induced Microstructural Changes on THz-Reflection and Electrical Conductivity of Al-Doped ZnO Thin-Films

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Journal of Surface Engineered Materials and Advanced Technology 2016年第3期6卷 106-117页

作者： yaohua zhu Weien Lai Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hong Kong China Faculty of Physics and Materials Sciences Center Philipps-University Marburg Marburg Germany

Electropulsing induced phase transformation and crystal orientation change and their effects on electrical conductivity, THz reflection and surface roughness of thin-films of Al2O3 (2 wt%) doped ZnO were studied using XRD, SEM, AFM and Thz spectroscopy techniques. AZO-2 thin-films showed an effective response in THz spectroscopy under electropulsing. Electropulsing induced circular preferred crystal orientation changes and phase transformations were observed. The preferred crystal orientation changes accompanying decrease in stress and the secondary phase precipitation favored enhancing conductivity and THz reflection of the AZO-2 thin-films. After adequate electropulsing, both THz reflection and electrical conductivity of the thin-films were enhanced by 22.8% and 6.8%, respectively;meanwhile surface roughness reduced. The property responses of electropulsing are discussed from point view of microstructural change and dislocation dynamics.

关键词： Electropulsing Precipitation Preferred Crystal Orientation THz Reflection Electrical Conductivity AZO Thin-Films

Dynamic Electropulsing Induced Phase Transformations and Their Effects on Single Point Diamond Turning of AZ91 Alloy

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Journal of Surface Engineered Materials and Advanced Technology 2012年第1期2卷 16-21页

作者： Duo Zhang S. To yaohua zhu Hao Wang Guoyi Tang 不详

The effects of dynamic electropulsing on microstructure changes and phase transformations of a rolled Mg-9Al-1Zn alloy were studied by using optical microscopy, X-ray diffraction, back-scattered scanning microscopy and transmission electron microscopy techniques. The decomposition of β phase was accelerated under dynamic electropulsing, compared with the conventional thermal processes. Dynamic electropulsing was less effective in affecting the phase transformations, but more effective in reducing residual stress than the static electropulsing. Dynamic electropulsing improved machinability of single point diamond turning, the mechanism of which is discussed from the point of view of dislocation dynamics.

关键词： Electropulsing Phase Transformations Dislocation Twins Magnesium Alloy

The Crystal Structure of Immunoglobulin Like Transcript 7 Domain 1

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The Crystal Structure of Immunoglobulin Like Transcript 7 Do...

Pipeline结构在高速闪存设计中的应用

第八届全国免疫学学术大会

作者： Joel Haywood yaohua zhu Jianxun Qi George F.Gao Institute of Microbiology Chinese Academy of Science

The plasmacytoid dendritic cell(p DC)receptor Immunoglobulin Like Transcript 7(ILT7)is known to bind to bone marrow stromal cell antigen 2(BST2).It is thought that this binding could result in the down-regulation of p DCs interferon-αin response to *** have recently elucidated the crystal structure of ILT7 domain1 at a resolution of 2.6.This structure reveals that ILT7 displays the characteristic features of group II ILT

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集成电路应用 2018年第11期35卷 22-24,30页

作者：朱瑶华上海冠捷半导体有限公司上海201203

基于冠捷半导体高速闪存IP的现有结构,提出一种Pipeline结构的解决方案,对于高速闪存IP设计中速度时序控制进行研究,达到优化闪存读取速度的目的。利用2周期或3周期Pipeline结构,在读取当前地址的同时,同时开始下一个地址的读取工作,使... 详细信息

基于冠捷半导体高速闪存IP的现有结构,提出一种Pipeline结构的解决方案,对于高速闪存IP设计中速度时序控制进行研究,达到优化闪存读取速度的目的。利用2周期或3周期Pipeline结构,在读取当前地址的同时,同时开始下一个地址的读取工作,使不同阶段的工作同时在一个时间段内完成。锁存器锁存上一个地址的结果,从而不会影响到下一个地址的读取操作。在55 nm嵌入式闪存工艺平台上仿真通过,实现闪存IP读取频率从100 MHz到166 MHz的提升。

关键词： Pipeline 嵌入式闪存高速读取