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The performance of a z-level ocean model in modeling the global tide

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Acta Oceanologica Sinica 2016年第11期35卷 35-43页

作者： XIAO Bin qiAO Fangli shu qi College of Oceanic and Atmospheric Sciences Ocean University of China The First Institute of Oceanography State Oceanic Administration Laboratory for Regional Oceanography Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

The performance of a z-level ocean model, the Modular Ocean Model Version 4（MOM4）, is evaluated in terms of simulating the global tide with different horizontal resolutions commonly used by climate models. The performance using various sets of model topography is evaluated. The results show that the optimum filter radius can improve the simulated co-tidal phase and that better topography quality can lead to smaller rootmean square（RMS） error in simulated tides. Sensitivity experiments are conducted to test the impact of spatial resolutions. It is shown that the model results are sensitive to horizontal resolutions. The calculated absolute mean errors of the co-tidal phase show that simulations with horizontal resolutions of 0.5° and 0.25° have about 35.5% higher performance compared that with 1° model resolution. An internal tide drag parameterization is adopted to reduce large system errors in the tidal amplitude. The RMS error of the best tuned 0.25° model compared with the satellite-altimetry-constrained model TPXO7.2 is 8.5 cm for M_2. The tidal energy fluxes of M_2 and K_1 are calculated and their patterns are in good agreement with those from the TPXO7.2. The correlation coefficients of the tidal energy fluxes can be used as an important index to evaluate a model skill.

关键词： global tide Modular Ocean Model global tidal energy flux

THE HYDRODYNAMIC CHARACTERISTICS OF FREE VARIABLE-PITCH VERTICAL AXIS TIDAL TURBIN

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Journal of Hydrodynamics 2012年第6期24卷 834-839页

作者： ZHANG Xue-weii WANG shu-qi WANG Feng ZHANG Liang SHENG qi-hu Institute of Ocean Renewable Energy System Harbin Engineering University

The hydrodynamic characteristics of free variable-pitch vertical axis tidal turbine are investigated by combining experimental and numerical simulations. The variations of hydrodynamics are obtained based on testing the kinematics and the dynamics of the turbine under different flow and structural conditions. Through analyzing the movement of the turbine and the characteristics of the flow field by numerical simulations, it is shown how the turbine＇s performance is improved.

关键词： tidal current energy vertical axis variable-pitch turbine hydrodynamic characteristics experiments

A new iron(Ⅲ) chelator of coprogen-type siderophore from the deep-sea-derived fungus Mycosphaerella sp. SCSIO z059

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Chinese Journal of Natural Medicines 2020年第4期18卷 243-249页

作者： HUANG Zhong-Hui LIANG Xiao qi shu-Hua CAS Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaInstitution of South China Sea Ecology and Environmental EngineeringSouth China Sea Institute of OceanologyChinese A cademy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory Guangzhou 511458China

Mycosphazine A(1), a new iron(Ⅲ) chelator of coprogen-type siderophore, and mycosphamide A(2), a new cyclic amide benzoate, together with six known aryl amides(3-8), were isolated from the fermentation broth of the deep-sea-derived fungus Mycosphaerella sp. SCSIO z059. Alkaline hydrolysis of 1 afforded a new epimer of dimerum acid, mycosphazine B(1 a), and a new bi-fusarinine-type siderophore, mycosphazine C(1 b). The planar structures of the new compounds were elucidated by extensive spectroscopic data analysis. The absolute configurations of amino acid residues in 1 a and 1 b were determined by acid hydrolysis. And the absolute configuration of 2 was established by quantum chemical calculations of the electronic circular dichroism(ECD) spectra. Compound 1 is the first siderophore-Fe(Ⅲ) chelator incorporating both L-ornithine and D-ornithine unites. Compounds 3-8 were reported as natural products for the first time, and the 1 H and 13 C NMR data of 6 and 8 were assigned for the first time. Compounds 1 and 1 a could greatly promote the biofilm formation of bacterium Bacillus amyloliquefaciens with the rate of about 249% and 524% at concentration of 100 μg·mL-1, respectively.

关键词： Deep-sea-derived fungus Mycosphaerella sp Iron(Ⅲ)chelator Coprogen-type siderophore Cyclic amide Biofilm formation

A Sensitivity Study of Arctic Ice-Ocean Heat Exchange to the Three-Equation Boundary Condition Parametrization in CICE6

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Advances in Atmospheric Sciences 2022年第9期39卷 1398-1416页

作者： Lei YU Jiping LIU Yongqi GAO qi shu Climate Changes Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Department of Atmospheric and Environmental Sciences University at AlbanyState University of New YorkAlbanyNew York 12222USA Nansen Environmental and Remote Sensing Center/Bjerknes Center for Climate Research Bergen N-5007Norway Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China

In this study,we perform a stand-alone sensitivity study using the Los Alamos Sea ice model version 6(CICE6)to investigate the model sensitivity to two Ice-Ocean(IO)boundary condition *** is the two-equation approach that treats the freezing temperature as a function of the ocean mixed layer(ML)salinity,using two equations to parametrize the IO heat *** approach uses the salinity of the IO interface to define the actual freezing temperature,so an equation describing the salt flux at the IO interface is added to the two-equation approach,forming the so-called three-equation *** focus on the impact of the three-equation boundary condition on the IO heat exchange and associated basal melt/growth of the sea ice in the Arctic *** with the two-equation simulation,our three-equation simulation shows a reduced oceanic turbulent heat flux,weakened basal melt,increased ice thickness,and reduced sea surface temperature(SST)in the *** impacts occur mainly at the ice edge regions and manifest themselves in ***,in August,we observed a downward turbulent heat flux from the ice to the ocean ML in two of our three-equation sensitivity runs with a constant heat transfer coefficient(0.006),which caused heat divergence and congelation at the ice ***,the influence of different combinations of heat/salt transfer coefficients and thermal conductivity in the three-equation approach on the model simulated results is *** results presented in this study can provide insight into sea ice model sensitivity to the three-equation IO boundary condition for coupling the CICE6 to climate models.

关键词： Arctic ice-ocean heat exchange three-equation boundary condition reduced oceanic turbulent heat flux CICE6

Dwell Time of Particles in Tunneling Barriers of Arbitrary Shape

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Chinese Physics Letters 1998年第12期15卷 862-864页

作者： BAI Er-juan shu qi-qing Institute of Applied Nuclear Technology Shenzhen UniversityShenzhen 518060 School of Science Shenzhen UniversityShenzhen 518060

For a one-dimensional barrier of arbitrary shape,an expression of the dwell time of tunneling particles has been obtained by subdividing it into infinitesimal rectangular barrier elements and then summing the dwell times spent by particles inside the barrier elements,and the dwell times in a parabolic potential barrier were *** results show that the dwell times are almost independent of the barrier width as it is greater than a characteristic width *** can be ascribed that in the width range beyond Wc,the tunneling probabilities through the barrier elements are very small,thus the times taken to tunnel through them make little contribution to the summation of the dwell times in all the barrier elements.

关键词： barrier tunneling beyond

3D FE Analysis of Thermal Behavior of Billet in Rod and Wire Hot Continuous Rolling Process

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Journal of Iron and Steel Research International 2007年第1期14卷 29-32,46页

作者： YUAN Si-yu ZHANG Li-wen LIAO shu-lun qi Min ZHEN Yu GUO shu-qi School of Materials Science and Engineering Dalian University of Technology Dalian 116024 Liaoning China Special Steel Rod and Wire Continuous Rolling Mill Dongbei Special Steel Group Co Dalian 116031 Liaoning China

An FE model was developed to study thermal behavior during the rod and wire hot continuous rolling process. The FE code MSC. Marc was used in the simulation using implicit static arithmetic. The whole rolling process of 30 passes was separated and simulated with several continuous 3D elastic-plastic FE models. A rigid pushing body and a data transfer technique were introduced into this model. The on-line experiments were conducted on 304 stainless steel and GCr15 steel hot continuous rolling process to prove the results of simulation by implicit static FEM. The results show that the temperature results of finite element simulations are in good agreement with experiments, which indicate that the FE model developed in this study is effective and efficient.

关键词： FE analysis thermal behavior hot continuous rolling 3D deformation

A comparison of two global ocean-ice coupled models with different horizontal resolutions

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Acta Oceanologica Sinica 2013年第8期32卷 1-11页

作者： shu qi qiAO Fangli SONG Zhenya YIN Xunqiang College of Physical and Environmental Oceanography Ocean University of China First Institute of Oceanography State Oceanic Administration Key Laboratory of Marine Science and Numerical Modeling State Oceanic Administration

A global eddy-permitting ocean-ice coupled model with a horizontal resolution of 0.25° by 0.25° is estab- lished on the basis of Modular Ocean Model version 4 （MOM4） and Sea Ice Simulator （SIS）. Simulation results are compared with those of an intermediate resolution ocean-ice coupled model with a horizontal resolution of about 1° by 1°. The results show that the simulated ocean temperature, ocean current and sea ice concentration from the eddy-permitting model are better than those from the intermediate resolu- tion model. However, both the two models have the common problem of ocean general circulation models （OGCMs） that the majority of the simulated summer sea surface temperature （SST） is too warm while the majority of the simulated subsurface summer temperature is too cold. Further numerical experiments show that this problem can be alleviated by incorporating the non-breaking surface wave-induced vertical mixing into the vertical mixing scheme for both eddy-permitting and intermediate resolution models.

关键词： eddy-permitting model intermediate resolution model non-breaking surface wave-induced vertical mixing

Effect of increasing Arctic river runoff on the Atlantic meridional overturning circulation:a model study

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Acta Oceanologica Sinica 2017年第8期36卷 59-65页

作者： shu qi qiAO Fangli SONG Zhenya XIAO Bin The First Institute of Oceanography State Oceanic AdministrationQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Key Laboratory of Marine Science and Numerical Modeling State Oceanic AdministrationQingdao 266061China

An increasing amount of freshwater has been observed to enter the Arctic Ocean from the six largest Eurasian rivers over the past several decades. The increasing trend is projected to continue in the twenty-first century according to Coupled Model Intercomparison Project Phase 5 （CMIP5） coupled models. The present study found that water flux from rivers to the Arctic Ocean at the end of the century will be 1.4 times that in 1950 according to CMIP5 projection results under Representative Concentration Pathway 8.5. The effect of increasing Arctic river runoff on the Atlantic meridional overturning circulation （AMOC） was investigated using an ocean-ice coupled model. Results obtained from two numerical experiments show that 100, 150 and 200 years after the start of an increase in the Arctic river runoff at a rate of 0.22%/a, the AMOC will weaken by 0.6 （3%）, 1.2 （7%） and 1.8 （11%） Sv. AMOC weakening is mainly caused by freshwater transported from increasing Arctic river runoff inhibiting the formation of North Atlantic Deep Water （NADW）. As the AMOC weakens, the deep seawater age will become older throughout the Atlantic Basin owing to the increasing of Arctic runoff.

关键词： climate change Arctic river runoff Atlantic meridional overturning circulation

Nacre-inspired Polyglutamic Acid/Layered Double Hydroxide Bionanocomposite Film with High Mechanical,Translucence and UV-blocking Properties

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Chinese Journal of Polymer Science 2017年第5期35卷 631-640页

作者： Ben-liang Liang Ying-qi shu 殷鹏刚 Lin Guo School of Chemistry & Environment Beihang University

Due to the various needs in the current applications, multifunctional composite materials with high strength and high toughness were highly desired now. Many scholars dedicated their time to find a simple, green and fast method for the preparation of multi-functional materials. In this study, inspired by the hierarchical ＂brick-and-mortar＂ structure and excellent mechanical performance of nacre, a fast green vacuum-filtration method was used to fabricate strong and multifunctional polyglutamic acid/layered double hydroxide （PGA/LDH） films mimicking nacre. The experimental results confirm that the artificial nacre has hierarchical ＂brick-and-mortar＂ structure. It exhibits excellent strength （93.5 MPa） and flexibility （easily bendable fold）, combining with outstanding properties of UV-blocking and translucence properties. This work provides a way of fabricating multifunctional organic-inorganic hybrid films, which has potential applications in the areas of optical, transportation and construction fields.

关键词： Nacre-inspired Multifunctional Mechanical properties UV-blocking Hierarchical structure