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Observation and simulation of the diffuse attenuation coefficient of downwelling irradiance in the Polar Ocean

Science China Earth Sciences 2023年第7期66卷 1535-1546页

作者： Weibo WANG Chunsheng JING xiaogang guo Ocean Dynamic Laboratory Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Physical and Geological Processes Xiamen 361005China

The three-stream radiation transfer model is used to investigate the fluctuation in the underwater diffuse attenuation coefficient of downwelling irradiance in the polar ocean with a high solar zenith angle and different direct radiation ***,the applicability of the three-stream radiation model in the polar region is validated by using 18 in situ observation data from September to October 2009 in the Beaufort *** show that in the absence of sea ice,the average relative errors between the simulation and observation values for 490 nm downwelling irradiance (E_(d)(490)) and its diffuse attenuation coefficient (K_(d)(490)) are 7.04%and 9.88%,*** the stations surrounded by sea ice,the radiation is relatively small due to ice blocking,and the average relative errors simulated by the model reach 15.89%and 15.55%,***,simulations with different chlorophyll concentrations and different proportions of direct radiation reveal that a high solar zenith angle has a greater impact on K_(d)(490) in the surface water.K_(d)(490) is less affected by the light field (affected by the solar zenith angle and the proportion of direct radiation) at depths greater than 30 m,and meets the linear relationship with the inherent optical parameters(the sum of the absorption coefficient and backscattering coefficient).The surface K_(d)(490) is still consistent with that at a depth of more than 50 meters under a high solar zenith angle,implying that the surface K_(d)(490) can also be considered as an inherent optical parameter at a high solar zenith angle (greater than 60 degrees).The relative error of obtaining surface K_(d)(490) by using the linear relationship at the 50 m layer is found to be less than 8%in the seawater with chlorophyll concentration greater than0.05 mg m^(-3).The effect of the solar zenith angle and proportion of direct radiation can be ignored when measuring the diffuse attenuation coefficient in the polar ***,the

关键词： “three-stream”radiation transfer model Diffuse attenuation coefficient Solar zenith angle Proportion of direct radiation Polar ocean

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The winter western boundary current of the South China Sea:physical structure and volume transport in December 1998

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Acta Oceanologica Sinica 2018年第3期37卷 1-7页

作者： LI Li guo xiaogang WU Risheng Third Institute of Oceanography State Oceanic Administration

The unique survey in December 1998 mapped the entire western boundary area of the South China Sea（SCS）,which reveals the three-dimensional structure and huge volume transport of the swift and narrow winter western boundary current of the SCS（SCSwwbc） in full scale. The current is found to flow all the way from the shelf edge off Hong Kong to the Sunda Shelf with a width around 100 km and a vertical scale of about 400 m. It appears to be the strongest off the Indo-China Peninsula, where its volume transport reached over 20×10~6 m^3/s. The current is weaker upstream in the northern SCS to the west of Hong Kong. A Kuroshio loop or detached eddy intruded through the Luzon Strait is observed farther east where the SCSwwbc no more exists. The results suggest that during the survey the SCSwwbc was fed primarily by the interior recirculation of the SCS rather than by the＂branching＂ of the Kuroshio from the Luzon Strait as indicated by surface drifters, which is likely a near-surface phenomenon and only contributes a minor part to the total transport of the SCSwwbc. Several topics related to the SCSwwbc are also discussed.

关键词： South China Sea western boundary current winter hydrographic structure volume transport

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Subtidal variability in the Taiwan Strait induced by combined forcing of winter monsoon and topography

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Science China Earth Sciences 2018年第4期61卷 483-493页

作者： Li LI xiaogang guo Enhui LIAO Yuwu JIANG Third Institute of Oceanography State Oceanic Administration State Key Laboratory of Marine Environmental Science Xiamen University College of Earth Ocean and EnvironmentUniversity of Delaware

As an important channel connecting the East and South China Seas, circulations in the Taiwan Strait are strongly influenced by the East Asian monsoon and the topography of the strait, especially the Taiwan Bank(TWB), which is a remarkable topographic feature located at the southern entrance to the strait. Based on a series of pressure gauges deployed roughly 40 km offshore along the western Strait, subtidal sea-level variability under the combined impact of winter monsoon and topography was studied. The analyses show significant along-strait coherences of subtidal sea levels and their coherences with the large-scale monsoon wind for periods from 2 to 14 days. It is suggested that these fluctuations are mainly forced waves driven by the large-scale winds. In addition to the normal cross-shore wind setup, a sea-level setup in the along-strait direction is confirmed, which is induced by the combined forcing of the fluctuating winter monsoon and the blocking of the TWB. A southward current surge driven by a northerly wind event will cause a rising sea level over the TWB inducing a southward alongshore slope anomaly to the north of the TWB and a reversed slope anomaly to the south The subtidal current through the channel to the west of the TWB is found to be influenced by the reversed slope anomalies generated via the along-shore setup.

关键词： Subtidal variabilities Along-strait sea level setup Taiwan Strait Taiwan Bank

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Mathematical and computational approaches to epidemic modeling： a comprehensive review

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Frontiers of Computer Science 2015年第5期9卷 806-826页

作者： Wei DUAN Zongchen FAN Peng ZHANG Gang guo xiaogang QIU Center of Computational Experiments and Parallel Systems Technology College of Information Systems and Management National University of Defense Technology Chang sha 410073 China

Mathematical and computational approaches are important tools for understanding epidemic spread patterns and evaluating policies of disease control. In recent years, epidemiology has become increasingly integrated with mathematics, sociology, management science, complexity science, and computer science. The cross of multiple disciplines has caused rapid development of mathematical and computational approaches to epidemic modeling. In this article, we carry out a comprehensive review of epidemic models to provide an insight into the literature of epidemic modeling and *** introduce major epidemic models in three directions, including mathematical models, complex network models, and agent-based models. We discuss the principles, applications, advantages, and limitations of these models. Meanwhile, we also propose some future research directions in epidemic modeling.

关键词： mathematics complex networks agent-basedmodels epidemic modeling human dynamics infectious diseases

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Electrochemical characterization of ion selectivity in electrodeposited nickel hexacyanoferrate thin films

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Journal of University of Science and Technology Beijing 2008年第1期15卷 79-83页

作者： Jinxia guo xiaogang Hao Xuli Ma Zhonglin Zhang Shibin Liu Department of Chemical Engineering Talyuan University of Technology Talyuan 030024 China

The ion selectivity of electrodeposited nickel hexacyanoferrate （NiHCF） thin films was investigated using electrochemical impedance spectroscopy （EIS） and cyclic voltammetry （CV）. NiHCF thin films were prepared by cathodic deposition on Pt and Al substrates. EIS and CV curves were determined in 1 mol/L （KNO3＋C5NO3） and 1 mol/L （NaNO3＋CsNO3） mixture solutions, which were sensitive to the concentration of Cs^＋ in the electrolytes. Experimental results show that all Nyquist impedance plots show depressed semicircles in the high-frequency range changing over into straight lines at lower frequencies. With increasing amounts of Cs^＋, the redox potentials in CV curves shift toward more positive values and the redox peaks broaden; the semicircle radius in corresponding EIS curves and the charge transfer resistance also increase. EIS combining CV is able to provide valuable insights into the ion selectivity of NiHCF thin films. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： NiHCF thin films ion selectivity electrochemical deposition cyclic voltammetry electrochemical impedance spectra

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Evaluation of reanalysis surface wind products with quality-assured buoy wind measurements along the north coast of the South China Sea

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Acta Oceanologica Sinica 2021年第3期40卷 58-69页

作者： Jing Cha Xinyu Lin xiaogang guo Xiaofang Wan Dawei You Third Institute of Oceanography Ministry of Natural ResourcesXiamen 361005China South China Sea Branch Ministry of Natural ResourcesGuangzhou 510000China

Three archived reanalysis wind vectors at 10 m height in the wind speed range of 2-15 m/s,namely,the second version of the National Centres for Environmental Prediction(NCEP)Climate Forecast System Reanalysis(CFSv2),European Centre for Medium-Range Weather Forecasting Interim Reanalysis(ERA-I)and NCEPDepartment of Energy(DOE)Reanalysis 2(NCEP-2)products,are evaluated by a comparison with the winds measured by moored buoys in coastal regions of the South China Sea(SCS).The buoy data are first quality controlled by extensive techniques that help eliminate degraded *** evaluation results reveal that the CFSv2 wind vectors are most consistent with the buoy winds(with average biases of 0.01 m/s and 1.76°).The ERA-I winds significantly underestimate the buoy wind speed(with an average bias of-1.57 m/s),while the statistical errors in the NCEP-2 wind direction have the largest *** diagnosis of the reanalysis wind errors shows the residuals of all three reanalysis wind speeds(reanalysis-buoy)decrease with increasing buoy wind speed,suggesting a narrower wind speed range than that of the ***,wind direction errors are examined to depend on the magnitude of the wind speed and the wind speed *** general,the evaluation of three reanalysis wind products demonstrates that CFSv2 wind vectors are the closest to the winds along the north coast of the SCS and are sufficiently accurate to be used in numerical models.

关键词： evaluation quality control buoy wind coastal regions of the South China Sea

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Stiffness and toughness of soft/stiff suture joints in biological composites

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Applied Mathematics and Mechanics(English Edition) 2022年第10期43卷 1469-1484页

作者： Dong WU Yixing HUANG Ming LEI Zeang ZHAO xiaogang guo Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China

Biological composites can overcome the conflict between strength and toughness to achieve unprecedented mechanical properties in engineering *** suture joint,as a kind of heterogeneous architecture widely existing in biological tissues,is crucial to connect dissimilar components and to attain a tradeoff of all-sided functional ***,the suture joints have attracted many researchers to theoretically investigate their mechanical ***,most of the previous models focus on the sutural interface between two chemically similar stiff phases with(or without)a thin adhesive layer,which are under the framework of linear elasticity and small ***,a general model based on the finite deformation framework is proposed to explore the stiffness and toughness of chemically dissimilar suture joints connecting soft and stiff *** tension tests are conducted to investigate the tensile response of the suture joints,and finite element simulations are implemented to explore the underlying mechanisms,considering both material nonlinearity and cohesive properties of the *** failure modes are quantitively captured by our *** stored elastic energy in the soft phase competes with the energy dissipation due to the interface debonding,which controls the transition among different failure *** toughness of the suture joints depends on not only the intrinsic strengths of the constituent materials and their cohesive strength,but also the interfacial *** work provides the structureproperty relationships of the soft/stiff suture joints and gives a foundational guidance of mechanical design towards high-performance bioinspired composites.

关键词： suture joint biological composite finite deformation toughness

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Convenient design of anti-wetting nano-Al/WO_(3)metastable intermolecular composites(MICs)with an enhanced exothermic life-span

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Defence Technology（防务技术） 2023年第2期20卷 84-92页

作者： xiaogang guo Taotao Liang Junfeng guo Huisheng Huang Shuying Kong Jianwei Shi Binfang Yuan Qi Sun Chongqing Key Laboratory of Inorganic Special Functional Materials College of Chemistry and Chemical EngineeringYangtze Normal UniversityChongqing408100PR China Chongqing Sports Medicine Center Department of Orthopedic SurgerySouthwest HospitalThe Third Military Medical UniversityChongqing40038China College of Life Sciences Chongqing Normal UniversityChongqing401331China

For solving the dilemma of the short exothermic life-span of WO_(3)based metastable interstitial composites(MICs)with extensive application prospect,this paper has firstly designed the promising antiwetting Al/WO_(3)MICs via electrophoresis assembly of nano-Al and WO_(3)particles fabricated by hydrothermal synthesis method,followed by the subsequent fluorination treatment.A combination of X ray diffraction(XRD),field emission scanning electron microscope(FESEM),energy dispersive X-ray spectroscopy(EDX),and Fourier transform infrared spectroscopy(FT-IR)techniques were utilized in order to characterize the crystal structure,microstructure,and elemental composition distribution of target films after different natural exposure *** product with uniform distribution and high purity possesses a high contact angle of~170°and a minute sliding angle of~1°,and displays the outstanding anti-wetting property using droplets with different surface *** also shows great moisture stability in high relative-humidity circumstances after one year of the natural exposure ***,the heat output of a fresh sample can reach up to 2.3 kJ/g and retain 96%after the whole exposure test,showing outstanding thermo-stability for at least one *** work further proposed the mechanism of antiwetting Al/WO_(3)MICs considering the variation tendency of their DSC curve,providing a valuable theoretical reference for designing other self-protected MICs with a long exothermic life-span applied in wide fields of national defense,military industry,etc.

关键词： Electrophoresis assembly Al/WO_(3)MICs Fluorination treatment Anti-wetting property Exothermic life-span

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Seasonal variation of surface currents in the southwestern Taiwan Strait observed with HF radar

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Chinese Science Bulletin 2008年第15期53卷 2385-2391页

作者： ZHU DaYong LI Li LI Yan guo xiaogang Department of Oceanography Xiamen University Xiamen 361005 China The Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China State Key Laboratory of Marine Environmental Science Xiamen University Xiamen 361005 China

Long-term measurements from a pair of High-Frequency radar systems deployed near the coast of southern Fujian Province showed that surface currents in the southwestern Taiwan Strait were com-posed mainly of the monsoon-driven, seasonal fluctuation of longshore current and a persistent northeastward background flow with speeds around 10 cm/s. Measurements from bottom-moored ADCPs further indicated that below the surface Ekman layer longshore currents also directed to the north all year round.

关键词：台湾海峡 HF雷达气流季节变化

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The spatio-temporal variation of wintertime subtidal currents in the western Taiwan Strait

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Acta Oceanologica Sinica 2017年第11期36卷 4-13页

作者： SHEN Junqiang QIU Yun guo xiaogang PAN Aijun ZHOU Xiwu Third Institute of Oceanography State Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

A new data set of observations by six cruises of ship-mounted acoustic doppler current profiler（SADCP） and three 40 d long bottom-mounted ADCPs（BADCPs） is employed to reveal the spatiotemporal variability of tidal and subtidal currents in the western Taiwan Strait（TWS） during winter season. The results confirm the existence of intense cotidal lines for M2 tidal current, which is located north of 25°N. In this case, no existence of an amphidromic point can be identified. It is also revealed that the counter-wind current（CWC） can extend through the whole western TWS and even occupy the entire water column during winter monsoon relaxation. However,this CWC is observed to be thoroughly overwhelmed by the downwind China coastal current（CCC） during the two big monsoon bloom events in the winter of 2007, and the CCC consequently extends southward throughout the western TWS instead. Most importantly, the variation of the spatial extent for the CWC and the CCC in the western TWS is found to be well explained by the first two modes of the vector empirical orthogonal function（VEOF） analysis, that is, it is mainly controlled by a wind-driven quasi barotropic current as the first mode and slightly modulated by a relatively weak background current with a first-order baroclinic structure as the second mode.

关键词： counter-wind current China coastal current M2 tidal current Taiwan Strait winter season

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