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| 1 | A novel high resolution model without open boundary conditions applied to the China Seas: first investigation on tides显示文摘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 there.GOCTM is based on the framework of the Finite Volume approach for better mass conservation through improved transports across the discrete individual control volume.It also takes a full advantage of the geometric flexibility of unstructured mesh using a realistic global topography including the Arctic Ocean.The CS are given a special focus by refining the unstructured grids,but they are embedded into global domain naturally.Furthermore,GOCTM not only successfully avoids the treatment of the open boundaries,but also optimizes the trade-off between computational cost and model accuracy.Meanwhile,GOCTM is driven by the astronomical tide-generating potential and the secondary tide-generating potential directly,together with the wind stress and heat flux.GOCTM succeeds in reproducing the global eight principal tidal harmonic constants.Particularly,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 tide.This idea of GOCTM can also be referred for other regional ocean study. | YU Huaming CHEN Xueen BAO Xianwen Thomas Pohlmann WU Dexing | 2010 | Acta Oceanologica Sinica2010，29，6： | 5 |
| 2 | Contrast between the Climatic States of the Warm Pool in the Indian Ocean and in the Pacific Ocean显示文摘Based on the analysis of Levitus data, the climatic states of the warm pool in the Indian Ocean (WPIO) and in the Pacific Ocean (WPPO) are studied. It is found that WPIO has a relatively smaller area, a shallower bottom and a slightly lower seawater temperature than those of WPPO. The horizontal area at different depths, volumes, central positions, and bottom depths of both WPIO and WPPO show quite apparent signals of seasonal variation. The maximum amplitude of WPIO surface area’s seasonal variation is 58% larger over the annual mean value. WPIO’s maximum volume variation amplitude is 66% larger over the annual mean value. The maximum variation amplitudes of the surface area and volume of WPPO are 20. 9% and 20.6% larger over the annual mean value respectively. WPIO and WPPO show different temporal and spatial characteristics mainly due to the different wind fields and restriction of ocean basin geometry. For instance, seasonal northern displacement of WPIO is, to some extent, constrained by the basin of the Indian Ocean, while WPPO moves relatively freely in the longitudinal direction. The influence of WPIO and WPPO over the atmospheric motion must be quite different. | MENG Xiangfeng *, WU Dexing Laboratory of physical oceanography, Institute of Physical Oceanography, Ocean University of Qingdao, \ Qingdao 266003, P.R.China | 2002 | Journal of Ocean University of Qingdao2002，1，2： | 4 |
| 3 | Seasonal variations of air-sea heat fluxes and sea surface temperature in the northwestern Pacific marginal seas显示文摘Using a net surface heat flux(Qnet) product obtained from the objectively analyzed air-sea fluxes(OAFlux) project and the international satellite cloud climatology project(ISCCP), and temperature from the simple ocean data assimilation(SODA), the seasonal variations of the air-sea heat fluxes in the northwestern Pacific marginal seas(NPMS) and their roles in sea surface temperature(SST) seasonality are studied. The seasonal variations of Qnet, which is generally determined by the seasonal cycle of latent heat flux(LH), are in response to the advection-induced changes of SST over the Kuroshio and its extension. Two dynamic regimes are identified in the NPMS: one is the area along the Kuroshio and its extension, and the other is the area outside the Kuroshio. The oceanic thermal advection dominates the variations of SST and hence the sea-air humidity plays a primary role and explains the maximum heat losing along the Kuroshio. The heat transported by the Kuroshio leads to a longer period of heat losing over the Kuroshio and its Extension. Positive anomaly of heat content corresponds with the maximum heat loss along the Kuroshio. The oceanic advection controls the variations of heat content and hence the surface heat flux. This study will help us understand the mechanism controlling variations of the coupled ocean-atmosphere system in the NPMS. In the Kuroshio region, the ocean current controls the ocean temperature along the main stream of the Kuroshio, and at the same time, forces the air-sea fluxes. | LIU Na WU Dexing LIN Xiaopei MENG Qingjia | 2014 | Acta Oceanologica Sinica2014，33，3： | 3 |
| 4 | Winter heat budget in the Huanghai Sea and the effect from Huanghai Warm Current (Yellow Sea Warm Current)显示文摘Four sources of surface heat flux (SHF) and the satellite remote sensing sea surface temperature (SST) data are combined to investigate the heat budget closure of the Huanghai Sea (HS) in winter.It is found that heat loss occurs all over the HS during winter and the area averaged heat content change decreases with a rate of-106 W/m 2.Comparing with the area averaged SHF of-150 W/m 2 from the four SHF data sets,it can be concluded that the SHF plays a dominant role in the HS heat budget during winter.In contrast,the heat advection transported by the Huanghai Warm Current (Yellow Sea Warm Current,HWC) accounted for up to 29% of the HS heat content change.Close correlation,especially in February,between the storm events and the SST increase demonstrates that the HWC behaves strongly as a wind-driven compensation current. | QIAO Lulu WANG Xiaohua WANG Yongzhi WU Dexing BAO Xianwen MU Lin | 2011 | Acta Oceanologica Sinica2011，30，5： | 2 |
| 5 | Evaluation of monthly turbulent heat fluxes from WHOI analysis and NCEP reanalysis in the tropical Atlantic显示文摘The biases and their sources in monthly turbulent heat fluxes from the Woods Hole Oceanographic Institution (WHOI) analysis, and the National Centers for Environmental Prediction- National Center for Atmospheric Research reanalyses 1 and 2 (NCEP1 and NCEP2) are checked in the climatically representative regions in the tropical Atlantic using the fluxes from the Southampton Oceanographic Centre (SOC) and the pilot research moored array in the tropical Atlantic (PIRATA) as references. For the WHOI analysis, the biases in turbulent heat fluxes mainly exist in equatorial regions which are due to the overestimated sea surface temperature and the underestimated 2 m air humidity. For the NCEP2 reanalysis, the maximum biases, about (40±5) W/m2, exist in southeast and northeast trade wind regions, which are mainly caused by the flux algorithm used because the biases in wind speed and air-sea humidity difference are relatively small. In the equatorial regions, the flux biases in the NCEP2 derived from both flux-related basic variables and algorithm are equally large. Although the estimations of time series trends and air-sea humidity difference of the NCEP1 are improved greatly in the NCEP2, the biases of latent heat flux in the NCEP2 are about 20 W/m2 greater than those from the NCEP1 in the trade wind regions. The result shows that the climatologies and monthly variabilities of the turbulent heat fluxes from the WHOI are more accurate than those from the NCEP1 and NCEP2 in the tropical Atlantic, especially on outside of the equatorial regions. | JIANG Hua WANG Hui WU Dexing | 2005 | Acta Oceanologica Sinica2005，24，5： | 2 |
| 6 | The Kuroshio Extension: a leading mechanism for the seasonal sea-level variability along the west coast of Japan显示文摘 | Chao Ma Jiayan Yang Dexing Wu Xiaopei Lin | 2010 | Ocean Dynamics2010，，3： | 1 |
| 7 | The preliminary study of the high chlorophyll in the central Bohai Sea in summer显示文摘In the central Bohai Sea, both historical data and in situ observations show that the distribution of high chlorophyll concentration is consistent with warm water. The previous studies confirm that the warm water is caused by a joint effect of wave and tidal mixing. In this paper, the authors have coupled the Princeton ocean model (POM) with a biochemical model to further investigate the formation of the high chlorophyll concentration. When the wave mixing is excluded, the water temperature is lower and the chlorophyll concentration is also lower than the observation. However, if the wave mixing is included, strong wave mixing in the upper layer brings the warm water downward and nutrients upward so that both temperature and nutrients tend to be uniformly high from the surface to the bottom. This provides an environment which is favorable for the growth of the phytoplankton. Therefore the chlorophyll concentration, as a symbol of phytoplankton, shows high value in the central Bohai Sea. In conclusion, the wave mixing plays an important role in the formation of high chlorophyll concentration in the central Bohai Sea. | WANG Yue WU Dexing LIN Xiaopei | 2012 | Acta Oceanologica Sinica2012，31，1： | 1 |
| 8 | Mechanical design and energy absorption of 3D novel hybrid lattice metamaterials显示文摘In this paper,three-dimensional(3D)novel hybrid lattice structures with exceptional mechanical properties and energy absorbing performances were proposed,and experimental and finite element simulation comparisons were performed to demonstrate their potential in mechanical application.First,different types of basic cubic unit cells were designed for constructing three types of novel hybrid metamaterials,in which stepped circulation of different unit cells was conceived to generate architected metamaterials.Afterwards,quasi-static compression experiments and finite element simulations were performed to study the deformation process and failure mechanisms of as-fabricated hybrid metamaterials.The energy absorption efficiency,specific energy absorption(SEA)indicators,and energy absorption capabilities of different hybrid lattice metamaterials were compared and analyzed.The results show that the deformation mechanisms of novel hybrid lattice were beneficial for generating remarkable elevated densification strain,and the energy absorption efficiency can be tailored by altering the types or sizes of basic unit cells.Strain-hardening and bilinear features were also obtained. | ZHANG Peng Biligetu QI DeXing XUE Rui LIU Kai HUANG ZhiXin WU WenWang LI Ying | 2021 | Science China(Technological Sciences)2021，64，10： | 1 |
| 9 | Seasonal variability of turbulent heat fluxes in the tropical Atlantic Ocean based on WHOI flux product显示文摘The mean seasonal variability of turbulent heat fluxes in the tropical Atlantic Ocean is examined using the Woods Hole Oceanographic Institution(WHOI) flux product.The most turbulent heat fluxes occur during winter seasons in the two hemispheres,whose centers are located at 10°~20°N and 5°~15°S respectively.In climatological ITCZ,the turbulent heat fluxes are the greatest from June to August,and in equatorial cold tongue the turbulent heat fluxes are the greatest from March to May.Seasonal variability of sensible heat flux is smaller than that of latent heat flux and mainly is dominated by the variations of air-sea temperature difference.In the region with larger climatological mean wind speed(air-sea humidity difference),the variations of air-sea humidity difference(wind speed) dominate the variability of latent heat flux.The characteristics of turbulent heat flux yielded from theory analysis and WHOI dataset is consistent in physics which turns out that WHOI's flux data are pretty reliable in the tropical Atlantic Ocean. | JIANG Hua WANG Hui WU Dexing | 2007 | Acta Oceanologica Sinica2007，26，5： | 1 |
| 10 | Analyses of the predicted changes of the global oceans under the increased greenhouse gases scenarios显示文摘A new climate model (ECHAM5/MPI-OM1) developed for the fourth assessment report of the Intergovernmental Panel on Climate Change (IPCC) at Max-Planck Institute for Meteorology is used to study the climate changes under the different increased CO2 scenarios (B1, A1B and A2). Based on the corresponding model results, the sea surface temperature and salinity structure, the variations of the thermohaline circulation (THC) and the changes of sea ice in the northern hemisphere are analyzed. It is concluded that from the year of 2000 to 2100, un- der the B1, A1B and A2 scenarios, the global mean sea surface temperatures (SST) would increase by 2.5℃, 3.5℃ and 4.0℃ respectively, especially in the region of the Arctic, the increase of SST would be even above 10.0℃; the maximal negative value of the variation of the fresh water flux is located in the sub- tropical oceans, while the precipitation in the eastern tropical Pacific increases. The strength of THC de- creases under the B1, A1B and A2 scenarios, and the reductions would be about 20%, 25% and 25.1% of the present THC strength respectively. In the north- ern hemisphere, the area of the sea ice cover would decrease by about 50% under the A1B scenario. | MU Lin WU Dexing CHEN Xue'en Jungclaus | 2006 | Chinese Science Bulletin2006，51，21： | 1 |
| 11 | Impact of Autumn SST in the Japan Sea on Winter Rainfall and Air Temperature in Northeast China显示文摘We studied the impact of sea surface temperature anomaly(SSTA) in the Japan Sea and the sea area east of Japan on the winter rainfall and air temperature in Northeast(NE) China using the singular value decomposition(SVD) and empirical orthogonal function(EOF). The monthly-mean rainfall data observed at 160 stations in China, monthly-mean sea surface temperature(SST) of the Hadley Center for Climate Prediction and Research and monthly-mean air temperature from the NCEP reanalysis during 1960–2011 were used. Correlation analysis indicates that the SSTAs in the Japan Sea in September may last for three or four months and are an important index for forecasting the winter rainfall and air temperature in NE China. Positive SSTAs in the central Japan Sea and in the sea area east of Tokyo correspond to positive rainfall anomaly and negative air temperature anomaly in NE China. With the rise of SST in the Japan Sea, a weak cyclone appears over the Japan Sea. The northeasterly wind transports water vapor from the Okhotsk to NE China, resulting in more rainfall and lower air temperature. Negative SSTA years are accompanied by warmer air temperature and less snow in NE China. The 1000 h Pa geopotential height anomaly and wind anomaly fields are simulated by IAP-9L model, which supports the analysis results. | SHI Xiaomeng SUN Jilin WU Dexing YI Li WEI Dongni | 2015 | Journal of Ocean University of China2015，14，4： | 1 |
| 12 | The Influence of Typhoon'Hongxia'on the Intrusion of the Kuroshio Current into the South China Sea显示文摘This paper uses the Coupled Ocean-Atmosphere-Wave-Sediment Transport(COAWST)model to analyze the impact of typhoon‘Hongxia’on the velocity and position movement of the Kuroshio axis,the impact of typhoons on the Kuroshio intrusion into South China Sea(SCS),the corresponding water,heat,and salt fluxes,and the impact of Kuroshio water in the northeastern SCS.When typhoon‘Hongxia’passed,the Kuroshio intrusion into the SCS was the most significant at 21?N latitude.In the vertical direction,the Kuroshio intrusion was strongest in the subsurface layer,leading to the most significant changes in temperature and salinity in the northeastern part of the SCS in the subsurface layer.Under the influence of the southeastern monsoon in summer,a large amount of low-salinity water accumulates at the surface of the northeastern part of the SCS,and Kuroshio intrusive water remains in the bottom and middle portions of the subsurface layer.The westward deviation of the Kuroshio axis caused by the typhoon displays a certain lag compared with the hot and salty water intrusion into the SCS approximately 7 d later.The impact of the typhoon on the Kuroshio intrusion into the SCS lasts for 20 d.The typhoon caused increases in the water,heat,and salt fluxes associated with the Kuroshio intrusion into the SCS,and the contribution of the typhoon to these fluxes was as high as 40%.Under typhoon conditions,the maximum Kuroshio intrusion flux reached more than twice that before the typhoon. | GAO Shumin HAN Shuzong WANG Shicheng WU Dexing WANG Mingjie WU Kejian LIU Lili | 2023 | Journal of Ocean University of China2023，22，2： | 1 |
| 13 | Preliminary study on the dynamic mechanism of the deep equatorial jets显示文摘Preliminarystudyonthedynamicmechanismofthedeepequatorialjets￥WuDexing(ReceivedDecember15,1993;acceptedMarch7,1994)(Instituteo... | Wu Dexing (Received December 15, 1993 accepted March 7, 1994)(Institute of Physical OCeanography, Ocean University of Qingdao, Qingdao 266003, China) | 1994 | Acta Oceanologica Sinica1994，13，4： | 1 |
| 14 | The barrier layer in the south-ern region of the South China Sea显示文摘By analysing the CTD data in the southernregion of the South China Sea gathered during six cruisesbetween 1989 and 1999, a barrier layer with seasonalvariation just like what exists in the equatorial oceans isfound in this region. It is the first discovery in such amarginal sea yet. It is strong in autumn and a little weak in summer and winter. The thicker the barrier layer, the higher the average temperature of the upper mixed layer. The region with the thicker barrier layer overlaps the region with thehigher average temperature of the upper mixed layer, andaccords with the thicker region of the warm pool in the South China Sea got from the Levitus data. The barrier layer in the southern region of the South China Sea has significantinfluence on the heat storage of the upper ocean there. | WU Wei M.Tomczak FANG Xinhua WU Dexing | 2001 | Chinese Science Bulletin2001，46，16： | 1 |
| 15 | Numerical study of generation of the tidal shear front off the Yellow River mouth 显示文摘 | QIAO Lulu BAO Xianwen WU Dexing | 2008 | Continental Shelf Research2008，28，14： | 1 |
| 16 | Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea显示文摘Horizontal velocity spirals with a clockwise rotation(downward looking) rate of 1.7?m^(-1), on average, were observed in the western and northern Yellow Sea from December 2006 to February 2007. With the observed thermal wind relation,the beta-spiral theory was used to explain the dynamics of spirals. It was found that the horizontal diffusion of geostrophic vortex stretching is likely to be a major mechanism for generating geostrophic spirals. Vertical advection associated with surface/bottom Ekman pumping and topography-induced upwelling is too weak to support these spirals. Strong wind stirring and large heat loss in wintertime lead to weak stratification and diminish the effects of vertical advection. The cooling effect and vertical diffusion are offset by an overwhelming contribution of horizontal diffusion in connection with vortex stretching. The Richardson number-dependent vertical eddy diffusivity reaches a magnitude of 10^(-4) m^2 s^(-1) on average. An eddy diffusivity of 2870 m^2 s^(-1) is required for dynamic balance by estimating the residual term. This obtained value of 10-4 m^2 s^(-1) is in good agreement with the estimation in terms of observed eddy activities. The suppressed and unsuppressed diffusivities in the observation region are 2752 and 2881 m^2 s^(-1), respectively, which supports a closed budget for velocity rotation. | Xiangzhou SONG Rui Xin HUANG Dexing WU Fangli QIAO Guansuo WANG | 2019 | Advances in Atmospheric Sciences2019，36，2： | 0 |
| 17 | Tides and Turbulent Mixing in the North of Taiwan Island显示文摘Microstructure and hydrological profiles were collected along two cross-shelf sections from the deep slope to the shallow water in the north of Taiwan Island in the summer of 2006. While the tidal currents on the shelf were dominated by the barotropic tide with the current ellipse stretched across the shelf, significant internal tides were observed on the slope. The depth-mean turbulent kinetic energy(TKE) dissipation rate on the shelf was 10^(-6)W kg-1, corresponding to a diapycnal diffusivity of 10^(-2)m^2s^(-1). The depth-mean TKE dissipation rate on the slope was 1 × 10^(-7)W kg-1, with diapycnal diffusivity of 3.4 × 10^(-4)m^2s^(-1). The shear instability associated with internal tides largely contributed to the TKE dissipation rate on the slope from the surface to 150 m, while the enhanced turbulence on the shelf was dominated by tidal or residual current dissipations caused by friction in the thick bottom boundary layer(BBL). In the BBL, the Ekman currents associated with the northeastward Taiwan Warm Current were identified, showing a near-bottom velocity spiral, which agreed well with the analytical bottom Ekman solution. | Xiangzhou SONG Dexing WU Xiaohui XIE | 2019 | Advances in Atmospheric Sciences2019，36，3： | 0 |
| 18 | Application of computer-aided diagnosis of congenital heart disease in four-chamber view of fetal heart basic screening显示文摘To the Editor:Congenital heart disease(CHD)is the most common severe congenital malformation which threatens the health of the fetus and the primary factor of intrauterine death.Prenatal detection of severe CHD could reduce the neonatal mortality and morbidity.The detection rate ranges between 25.0%and 59.7%in the prenatal ultrasonographic examination.^([1])We need to identify new strategies to improve detection rates of CHD prenatally.Deep-learning(DL)-based computer-aided diagnosis(CAD)has been highly and rapidly developed in recent years. | Fangfei Su Xiaoqian Zhang Jijing Han Jingjing Wang Lu Li Dexing Kong Qingqing Wu | 2022 | Chinese Medical Journal2022，135，24： | 0 |
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