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| 1 | Analysis of deep-layer and bottom circulations in the South China Sea based on eight quasi-global ocean model outputs显示文摘This study is a preliminary analysis of the South China Sea(SCS)deep circulations using eight quasi-global high-resolution ocean model outputs.The goal is to assess models’ability to simulate these deep circulations.The analysis reveals that models’deep temperatures are colder than the observations in the World Ocean Atlas,while most models’deep salinity values are higher than the observations,indicating models’deep water is generally colder and saltier than the reality.Moreover,there are long-term trends in both temperature and salinity simulations.The Luzon Strait transport below 1500 m is 0.36 Sv when averaged for all models,smaller compared with the observation,which is about 2.5 Sv.Four assimilated models and one unassimilated(OCCAM)display that the Luzon deep-layer overflow reaches its minimum in spring and its maximum in winter.The vertically integrated streamfunctions below 2400 m from these models show a deep cyclonic circulation in the SCS on a large scale,but the pattern is different from the diagnostic streamfunction from the U.S Navy Generalized Digital Environment Model(GDEM-Version 3.0,GDEMv3).The meridional overturning structure above 1000 m is similar in all models,but the spatial distribution and intensity below 1500 m are quite different from model to model.Moreover,the meridional overturning below 2400 m in these models is weaker than that of the GDEMv3,which indicates a deep vertical mixing process in these models is biased weak.Based on the above evaluation,this paper discusses the impacts of T/S initial value,topography,and mixing scheme on the SCS deep circulations,which may provide a reference for future model improvement. | XIE Qiang XIAO JinGen WANG DongXiao YU YongQiang | 2013 | Chinese Science Bulletin2013，58，32： | 14 |
| 2 | Advances in research of the mid-deep South China Sea circulation显示文摘The South China Sea(SCS)is a large marginal sea connecting the Indian and Pacific oceans.Under the factors of monsoons,strait transport,and varied bathymetry,the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open ocean.Theoretical analysis and observations reveal that internal tides,internal solitary waves,and strong winds are the sources of the strong mixing in the northern SCS.A major consequence of the strong mixing is an active mid-deep circulation system.This system promotes exchange of water between the SCS and adjacent oceans,and also regulates the upper layer of wind-driven circulation,making the 3 dimensional SCS circulation clearly different from that in other tropical and subtropical marginal seas.The mass transport capacity of the mid-deep circulation has a substantial impact on marine sedimentation,the biogeochemical cycle,and other processes in the SCS.This paper summarizes the recent advances in middeep sea circulation dynamics of the SCS,and discusses the opportunities and challenges in this area. | Dongxiao WANG Qiang WANG Shuqun CAI Xiaodong SHANG Shiqiu PENG Yeqiang SHU Jingen XIAO Xiaohui XIE Zhiwei ZHANG Zhiqiang LIU Jian LAN Dake CHEN Huijie XUE Guihua WANG Jianping GAN Xinong XIE Rui ZHANG Hui CHEN Qingxuan YANG | 2019 | Science China Earth Sciences2019，62，12： | 8 |
| 3 | Progress on deep circulation and meridional overturning circulation in the South China Sea显示文摘The deep overflow through the Luzon Strait drives the cyclonic deep circulation in the South China Sea(SCS). In the mean time, the intruding Pacific deep water transforms and upwells due to enhanced diapycnal mixing in the SCS. Both processes greatly contribute to the SCS meridional overturning circulation(SCSMOC). At the same time, both the deep circulation and meridional overturning circulation are modulated by rough topography in the SCS. Furthermore, the spatial structure of the SCSMOC infers a link between the upper-layer circulation and deep circulation in the SCS. This paper reviews recent advances in the SCS deep circulation and meridional overturning circulation, including the driving mechanism of the SCS deep circulation and its modulation by topography, as well as the spatial structure of the SCSMOC and its dynamical mechanism. | WANG DongXiao XIAO JinGen SHU YeQiang XIE Qiang CHEN Ju WANG Qiang | 2016 | Science China Earth Sciences2016，59，9： | 6 |
| 4 | A Novel Spacetime Collocation Meshless Method for Solving Two- Dimensional Backward Heat Conduction Problems显示文摘In this article,a meshless method using the spacetime collocation for solving the two-dimensional backward heat conduction problem(BHCP)is proposed.The spacetime collocation meshless method(SCMM)is to derive the general solutions as the basis functions for the two-dimensional transient heat equation using the separation of variables.Numerical solutions of the heat conduction problem are expressed as a series using the addition theorem.Because the basis functions are the general solutions of the governing equation,the boundary points may be collocated on the spacetime boundary of the domain.The proposed method is verified by conducting several heat conduction problems.We also carry out numerical applications to compare the SCMM with other meshless methods.The results show that the SCMM is accurate and efficient.Furthermore,it is found that the recovered boundary data on inaccessible boundary can be obtained with high accuracy even though the over specified data are provided only at a 1/6 portion of the spacetime boundary. | Chihyu Liu Chengyu Ku Jingen Xiao Weichung Yeih | 2019 | Computer Modeling in Engineering & Sciences2019，，1： | 1 |
| 5 | Contraction and warming of Antarctic Bottom Water in the Amundsen Sea显示文摘Antarctic Bottom Water(AABW)plays an important role in the meridional overturning circulation and contributes significantly to global heat transport and sea level rise(SLR).Based on the Global Ocean(1/12)°Physical Reanalysis(GLORYS12V1)products and conductivity-temperature-depth instrument data from the World Ocean Circulation Experiment hydrographic program,we analyzed the trends in the thickness,volume,temperature,salinity,and neutral density of the AABW in the Amundsen Sea from 1993 to 2017.Over the past 25 years,the volume has decreased by 3.45×10^(12) m^(3)/a,thinning at a rate of 5 m/a.In the vertical direction,the contraction of the AABW is compensated by the volume expansion of the Circumpolar Deep Water.As the volume of AABW decreases,the temperature of the AABW increases by about 0.002℃/a.This warming is equivalent to a heat flux of 0.27 W/m^(2).A local SLR is produced due to thermal expansion of 0.35 mm/a.During the study period,the neutral density decreased by 0.0003 kg/(m^(3)·a)due to warming.In the horizontal direction,the volume of AABW flowing from the Ross Sea into the Amundsen Sea gradually decreases and the temperature of the AABW increases continuously.The horizontal transport loss of the AABW volume is 4.07×10^(14) m^(3) and the horizontal heat transport results in a 0.03℃ increase in the temperature of the AABW. | Yu Bai Liang Zhao Jingen Xiao Shiying Lin | 2022 | Acta Oceanologica Sinica2022，41，4： | 0 |
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