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fronts,baroclinic transport,and mesoscale variability of the Antarctic Circumpolar Current in the southeast Indian Ocean

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Acta Oceanologica Sinica 2012年第6期31卷 1-11页

作者： DUAN Yongliang HOU Yijun LIU Hongwei HU Po Institute of Oceanology Chinese Academy of SciencesQingdao 266071China Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071 China University of Chinese Academy of Sciences Beijing 100049China

fronts, baroclinic transport, and mesoscale variability of the Antarctic Circumpolar Current （ACC） along 115°E are examined on the basis of CTD data from two hydrographic cruises occupied in 1995 as a part of the World Ocean Circulation Experiment （WOCE cruise I9S） and in 2004 as a part of CLIVAR/CO2 repeat hydrography program. The integrated baroclinic transport across I9S section is （97.2×106±2.2×106） m3/s relative to the deepest common level （DCL）. The net transport at the north end of I9S, determined by the south Australian circulation system, is about 16.5× 106 m3/s westward. Relying on a consistent set of water mass criteria and transport maxima, the ACC baroclinic transport, （117×106±6.7×106） m3/s to the east, is carried along three fronts： the Subantarctic Front （SAF） at a mean latitude of 44°-49°S carries （50.6×106=t=13.4×106） m3/s; the Polar Front （PF）, with the northern branch （PF-N） at 50.5°S and the southern branch （PF- S） at 58°S, carries （51.3×106±8.7×106） m3/s; finally, the southern ACC front （SACCF） and the southern boundary of the ACC （SB） consist of three cores between 59°S and 65°S that combined carry （15.2× 106±1.8× 106） m3/s. Mesoscale eddy features are identifiable in the CTD sections and tracked in concurrent maps of altimetric sea level anomalies （SLA） between 44°-48°S and 53°-57°S. Because of the remarkable mesoseale eddy features within the SAF observed in both the tracks of the cruises, the eastward transport of the SAF occurs at two latitude bands separating by 1°. Both the CTD and the altimetric data suggest that the mesoscale variability is concentrated around the Antarctic Polar Frontal Zone （APFZ） and causes the ACC fronts to merge, diverge, and to fluctuate in intensity and position along their paths.

关键词： Antarctic Circumpolar Current fronts transport eddies

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The study on three-dimensional numerical model and fronts of the Jiulong Estuary and the Xiamen Bay

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Acta Oceanologica Sinica 2012年第4期31卷 55-64页

作者： LUO Zhibin PAN Weiran LI Li ZHANG Guorong College of Oceanography and Environmental Science Xiamen UniversityXiamen 361005China Third Institute of Oceanography State Oceanic AdministrationXiamen 361005China

Applying the methods of on-site observation and dynamic model, the research on the fronts at the Jiulong Estuary has been carried out, during which spatial and temporal distribution, dynamic characteristics and formation mechanism of salinity fronts are analyzed and discussed. The research shows that the estuarine fronts mainly lie in the area from the Jiyu Islet to the Haimen Island, outside of Yuweizai to Hulishan cross-section, the near coast of Yuweizai and the south of the Songyu-Gulangyu Channel. The fronts in the former two regions are formed directly by plume, while the one near the coast of Yuweizai is a tidal intrusion front caused by flood current and the one at the south of the Songyu-Gulangyu Channel is the result of current shear transformation. Under normal circumstances, fresh water of the Jiulong River mainly influences the inside of the Xiamen Bay, and when it is in typhoon seasons, plume front can affect the Taiwan Strait and has an effect on the biogeochemical Drocesses in the strait.

关键词： Jiulong Estuary Xiamen Bay three-dimensional numerical model fronts

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Trends of sea surface temperature and sea surface temperature fronts in the South China Sea during 2003–2017

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Acta Oceanologica Sinica 2019年第4期38卷 106-115页

作者： Yi Yu Hao-Ran Zhang Jiangbo Jin Yuntao Wang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural Resources College of Oceanography Hohai University International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of Sciences State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences

The trends of the sea surface temperature(SST) and SST fronts in the South China Sea(SCS) are analyzed during2003–2017 using high-resolution satellite data. The linear trend of the basin averaged SST is 0.31°C per decade,with the strongest warming identified in southeastern Vietnam. Although the rate of warming is comparable in summer and winter for the entire basin, the corresponding spatial patterns of the linear trend are substantially different between them. The SST trend to the west of the Luzon Strait is characterized by rapid warming in summer, exceeding approximately 0.6°C per decade, but the trend is insignificant in winter. The strongest warming trend occurs in the southeast of Vietnam in winter, with much less pronounced warming in summer. A positive trend of SST fronts is identified for the coast of China and is associated with increasing wind stress. The increasing trend of SST fronts is also found in the east of Vietnam. Large-scale circulation, such as El Ni?o, can influence the trends of the SST and SST fronts. A significant correlation is found between the SST anomaly and Ni?o3.4 index, and the ENSO signal leads by eight months. The basin averaged SST linear trends increase after the El Ni?o event(2009–2010), which is, at least, due to the rapid warming rate causing by the enhanced northeasterly wind. Peaks of positive anomalous SST and negatively anomalous SST fronts are found to co-occur with the strong El Ni?o events.

关键词： South China Sea sea surface temperature sea surface temperature fronts warming trend wind stress

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Engineering fronts in 2018

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Engineering 2018年第6期4卷 748-753页

作者： Fang Cai Jiu-Ming Ji Zhi-Qiang Jiang Zhi-Rui Mu Xiang Wu Wen-Jiang Zheng Wei-Xing Zhou Shan-Tung Tu Xuhong Qian College of Distance Education East China University of Science and TechnologyShanghai 200237China Institute of Science and Technology Information East China University of Science and TechnologyShanghai 200237China Research Center for Econophysics&School of Business East China University of Science and TechnologyShanghai 200237China Centre for Strategic Studies Chinese Academy of EngineeringBeijing 100088China Key Laboratory of Pressurized System and Safety Ministry of Education&School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China East China Normal University Shanghai 200062China Shanghai Key Laboratory of Chemical Biology East China University of Science and TechnologyShanghai 200237China

1.Introduction Engineering science and technology is an important driving force in changing the world,and engineering frontiers(here referred to as“engineering fronts”)are important guidelines for future directions in the development of engineering science and technology.Grasping trends in global engineering science and technology and quickly adapting to new directions in the current scientific and technological revolution have become strategic choices for countries all over the world.Since 2017,the Chinese Academy of Engineering has organized the Engineering fronts research project,together with Clarivate Analytics and Higher Education Press,with the hope of bringing together the expert knowledge of global engineering and technology talents,assessing global frontiers in engineering research and development,and developing strategic opportunities to provide a reference for active responses to global challenges and sustainable development.

关键词： Engineering fronts 2018

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Net-phytoplankton communities in the Western Boundary Currents and their environmental correlations

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Journal of Oceanology and Limnology 2018年第2期36卷 305-316页

作者：陈芸燕孙晓霞朱明亮 Jiao Zhou Bay Marine Ecosystem Research Station Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China Laboratory of Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and Technology Qingdao 266071 China

This study investigated net-phytoplankton biomass, species composition, the phytoplankton abundance horizontal distribution, and the correlations between net-phytoplankton communities and mesoscale structure that were derived from the net samples taken from the Western Boundary Currents during summer, 2014. A total of 199 phytoplankton species belonging to 61 genera in four phyla were identified. The dominant species included C limacodium frauenfeldianum, Thalassiothrix longissima, Rhizosolenia styliformis var. styliformis, Pyrocystis noctiluca, Ceratium trichoceros, and Trichodesmium thiebautii. Four phytoplankton communities were divided by cluster analysis and the clusters were mainly associated with the North Equatorial Counter Current(NECC), the North Equatorial Current(NEC), the Subtropical Counter Current(STCC), and the Luzon Current(LC), respectively. The lowest phytoplankton cell abundance and the highest T richodesmium filament abundance were recorded in the STCC region. The principal component analysis showed that T. thiebautii preferred warm and nutrient poor water. There was also an increase in phytoplankton abundance and biomass near 5°N in the NECC region, where they benefit from upwellings and eddies.

关键词： net-phytoplankton communities Western Boundary Currents upwelling eddies fronts

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Fishing Ground Distribution of Neon Flying Squid (Ommastrephes bartramii) in Relation to Oceanographic Conditions in the Northwest Pacific Ocean

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Journal of Ocean University of China 2017年第6期16卷 1157-1166页

作者： YU Wei CHEN Xinjun YI Qian College of Marine Sciences Shanghai Ocean University Shanghai 201306 P. R. China National Engineering Research Center for Oceanic Fisheries Shanghai Ocean University Shanghai 201306 P. R. China Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources Ministry of Education Shanghai Ocean University Shanghai 201306 P. R. China Collaborative Innovation Center for Distant-water Fisheries Shanghai Ocean University Shanghai 201306 P. R. China

Neon flying squid, Ommastrephes bartramii, is a squid species of the North Pacific Ocean, which plays an important economical role in the international fishery. Logbook data for Chinese squid-jigging fishery over 2004–2011 were used to evaluate the relationship between the fishing grounds of the squid and the convergent frontal areas, which were defined by the contour lines of specific sea surface temperature(SST) and chlorophyll-a(Chl-a) concentration. Our results indicate that the SST in the range of 15 to 19℃ and the Chl-a concentration in the range of 0.1 to 0.4 mg m^(-3) are the favorable conditions for the aggregation of the squid. Additionally, we deduced that the SST at 17.5℃ and the Chl-a concentration at 0.25 mg m^(-3) are the optimal environmental conditions for the aggregation of O. bartramii. In August, the annual CPUE is positively correlated with the proportion of the fishing grounds with favorable SST and Chl-a concentration, as well as the combination of the two variables, implying that the abundance of the squid annually is largely depending on the presence of the favorable environmental conditions for fishery in August. Minor spatial difference between mean latitudinal location of the 17.5℃ SST and 0.25 mg m^(-3) Chl-a fronts can increase the CPUEs of O. bartramii. Furthermore, the monthly latitudinal gravity centers of the CPUE closely followed the mean latitudinal position of the contour lines of the 17.5℃ SST and the 0.25 mg m^(-3) Chl-a concentration. Our findings suggest the convergent oceanographic features(fronts) play significant roles in regulating the distribution and abundance of the western stock of the winter-spring cohort of O. bartramii, which can help people to improve their ability to discover the O. bartramii fishing grounds with higher productivity.

关键词： neon flying squid sea surface temperature chlorophyll-a oceanic fronts fishing ground the Northwest Pacific Ocean

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A Study on Frontal Motion over Orography

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Advances in Atmospheric Sciences 1995年第3期12卷 325-334页

作者：肖庆农伍荣生 Department of Atmospheric Sciences Nanjing University Nanjing

In order to study the characteristic features of the frontal motion over mountains, a frontal model is designed inthis paper. The analytical solution of the model with the assumption of semigeostrophic approximation and no frichon is obtained and compared with numerical solution without the assumption. It assumes that the front is a free surface betWeen two nuid layers with different densihes. It also assumes that the mountain and the front are indefinitelylong. Therefore, the motion of such a front can be determined by the one-dimensional shallow water equationsystem. By making a series of experiments, we confirm the rule further that front can be retarded when climbing themountain and accelerated when going down the mountains. We also found some interesting characteristics of frontalstructure influenced by topography in addihon.

关键词： fronts Orography Frontal motion and structure

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THERMAL LENSES AND INTERNAL SOLITONS IN CHAPALA LAKE, MEXICO

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Chinese Journal of Oceanology and Limnology 1999年第4期17卷 308-314,300页

作者： A. E. Filonov I. E. Tereshchenko

Instrumental measurements of the circulation and thermic regimen of tropical Chapala Lake revealed the surface temperature variations in its eastern part. In all of the cross sections, spatial variations of 3℃ were ordinarily registered over a distance of just 100-300 m. The movements of the internal thermal front in the water body with 2℃ fluctuation were registered at a buoy station. The front’s forepart was accompanied by intensive internal waves in the form of internal KdeV solitons. The front near the buoy station was formed by the movement of the warm water body coming from the eastern shallow part of the lake and stimulated by the morning breeze.

关键词： Chapala Lake (Mexico) temperature and current measurements thermal fronts internal solitons

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Traveling Wavefronts on Reaction Diffusion Systems with Spatio-Temporal Delays

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Applied Mathematics 2013年第9期4卷 1278-1286页

作者： Xinli Han Lijun Pan College of Science Nanjing University of Posts and Telecommunications Nanjing China Department of Mathematics Nanjing University of Aeronautics and Astronautics Nanjing China

By using Schauder’s Fixed Point Theorem, we study the existence of traveling wave fronts for reaction-diffusion systems with spatio-temporal delays. In our results, we reduce the existence of traveling wave fronts to the existence of an admissible pair of upper solution and lower solution which are much easier to construct in practice.

关键词： Schauder’s Fixed Point Theorem Traveling Wave fronts Reaction-Diffusion Spatio-Temporal Delays

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空时编码技术文献分析

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现代情报 2005年第2期25卷 6-8页

作者：曹丽萍杨志萍四川大学成都610054 中国科学院成都文献情报中心成都610041

本文从文献计量学的角度 ,以ISI出版的研究前沿数据库 (Researchfronts)为主要数据来源 ,分析概括了有关空时编码技术目前的研究重点、国内外研究现状和今后的研究方向。

关键词：空时编码 ISI Research fronts 引文分析

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