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1.
Dimethylsulfide in the South China Sea   总被引:1,自引:0,他引:1  
INTRODUCTIONGreateffortsweredevotedrecentlytostudyingdimethylsulfide(DMS)distributioninseawater,asitaccountsforthemajorpartofthesulfurfluxfromtheoceanstotheatmosphere.Moreover,itsoxidationproductsintheatmospheremayinfluenceenvironmentalacidificationand…  相似文献   

2.
浅谈南海渔业管理对策   总被引:2,自引:0,他引:2  
南海渔业资源衰退的主要原因是捕捞过度和海洋生态环境破坏。由于海洋生态过程是动力学过程,很多生态因素的变化会相应引起生态过程的变化,同时生态动力学过程的因素又是多方面的,因此南海渔业资源的管理和生产方式应该从过去的开发型管理向着管理型管理方向转变。这种管理方式涉及面较广,必须实施从渔业资源管理、渔业水域管理、渔业水域周围环境管理到加强对渔船与船员管理、捕养并重、健全法制、强化治政队伍与执法力量配置以及开展国际渔业合作等管理措施。  相似文献   

3.
OCCAM global ocean model results were applied to calculate the monthly water transport through 7 straits around the East China Sea(ECS)and the South china Sea(SCS).Analysis of the features of velocity profiles and their variations in the Togara Strait,Luzon Strait and Eastern Taiwan Strait showed that;1)the velocity profiles had striped pattern in the Eastern Taiwan Strait,where monthly flux varied from 22.4 to 28.1 Sv and annual mean was about 25.8 Sv;2)the profiles of velocity in the Togara Strait were characterized by core structure,and monthly flux varied from 23.3 to 31.4 Sv,with annual mean of about 27.9 Sv;3)water flowed from the SCS to the ECS in the Taiwan Strait,with maximum flux of 3.1 Sv in July and minimum of 0.9 Sv in November;4)the flux in the Tsushima Strait varied by only about 0.4 Sv by season and its annual mean was about 2.3 Sv;5)Kuroshio water flowed into the SCS in the Luzon Strait throughout the year and the velocity profiles were characterized by multi-core structure.The flux in the Luzon Strait was minimun in June(about 2.4 Sv)and maximum in February(about 9.0 Sv),and its annual mean was 4.8 Sv;6)the monthly flux in the Mindoro Strait was maximum in December(3.0 Sv)and minimum in June(Only 0.1 Sv),and its annual mean was 1.3 Sv;7)Karimata Strait water flowed into the SCS from May to August,with maximum in-flow flux of about 0.75 Sv in June and flowed out from September to April at maximum outflow flux of 3.9 Sv in January.The annual mean flux was about 1.35 Sv.  相似文献   

4.
The South China Sea water can be divided according to depth into three boxes by the pycnoclineand a sill.Using a box model with matter balance,the net seawater fluxes were calculated to be317.9×10~4 m~3/s in box Ⅰ for the upper homogeneous layer outflowing to the adjoining oceans;67×10~4 m~3/s in box Ⅲ for the water entering the basin;240×10~4 m~3/s in box Ⅱ for water entering theSouth China Sea.The upward speed of basin water was calculated to be 8.4×10~(-5) cm/s and that ofseawater flowing up along the pycnocline was calculated to be 8.9×10~(-5) cm/s.  相似文献   

5.
Si, Ti, Al, Fe, Mn, Ca, Mg, K, Na, P and Sr, Ba, Rb, Ga, V, Zr, Cr, Ni, Co, Cu, Zn, Pb,Nb, Y, Th, La in the core S01 were analyzed and the pattems of their enrichment are discussed.Enrichment of Na, Fe, Mn, Ba, Cu elements in the core indicates volcanic material are an importantsoarce of the sediments in the area. The enrichment frequently varying with the deposition processshows bottom volcanism is frequent in the area and that the studied area is a margin basin with distinctoceanic characteristics. The abnormal enrichment of Mn at the layers(0-15 cm and 665-670 cm) of the core could beclosely related to and so, indicate, the wide deposition hiatus that have occurred in the West PacificOcean and adjacent margin seas since Late Pleistocene.  相似文献   

6.
INTRODUCTIONTheSouthChinaSea (SCS)isauniquesemi encloseddeepoceanbasinlocatednearthewest ernperipheryofthePacificOcean .Spreadingfromtheequatorto 2 0°Nandspanningzonallyabout1 5°N ,theSCSliesbetweentheSouthChinacoastandthemaritimecontinent.TheSCSbottomtopogr…  相似文献   

7.
THE NOMENCLATURE OF THE SOUTH CHINA SEA ISLANDS IN ANCIENT CHINA   总被引:1,自引:0,他引:1  
THENOMENCLATUREOFTHESOUTHCHINASEAISLANDSINANCIENTCHINA¥LiuNanwei(刘南威)(DepartmentofGeography,SouthChinaNormalUniversity,Guangz...  相似文献   

8.
ESR dating of aragonitic and calcitic corals , eolianite , calcrete , and corallineae from coral reefs in the South China Sea was applied to study of Quaternary reef geology . The ESR ages of calcitic corals correlated with the biostratigraphy , lithostratigraphy and geochemistry of Well Xi-Chen-1 and the oxygen-isotope stratigraphy of deep sea sediments, were reliable and up to 1.26 Ma. The selection of signals for dating and other related problems are discussed .  相似文献   

9.
CTD data on standard levels coolected during July and December in 1998 and the cubic spline interpolating method were used to study the characteristics of the transition layer temperature and salinity.The thermocline undergoes remarkable seasonal variation in the South China Sea (SCS),and especially in the region of the north shelf where the thermocline disappears in december.The thermocline is stronger and thicker in July than in December,There is no obvious seasonal variation in the halocline.Due to the upper Ekman transport caused by monsoon over the SCS,the thermocline slopes upward in July and downward in december from east to west in the northern SCS.The characteristics of the thermocline and halocline are influenced by local eddies in the SCS.The Zhujiang diluted flow influences significantly the SCS shelf‘s halocline.  相似文献   

10.
研究南海海域盛产的四种褐藻(海带、裙带菜、昆布和亨氏马尾藻)、三种红藻(紫菜、沙菜和江蓠)及来自南海三个不同海区(南沙、惠来和南澳)亨氏马尾藻的总脂质及脂肪酸含量干重,并重点比较其多不饱和脂肪酸的含量.结果表明,供试褐藻类海藻总脂质含量ω在1.81%~6.11%之间,红藻类海藻的总脂质含量ω在1.44%~3.96%之间;紫菜中含有7.548mg/g(干重,下同)的亚油酸(C182);海带含丰富C181,达5.592mg/g;花生四烯酸(C204)在裙带菜中含量为1.606mg/g;在供试藻种中,昆布的EPA(C20.5)和DHA(C226)含量最高,测定值为608μg/g和689μg/g.  相似文献   

11.
【目的】分析海面温度(sea surface temperature,SST)对南海台风强度的影响。【方法】以南海为研究区域,以中国气象局热带气旋资料中心热带气旋最佳路径数据集为基础,利用Savitzky-Golay卷积平滑算法和多项式插值算法将台风数据进行插值,对强化值和SST值在南海区域的网格单元进行平均,建立模型并对其做回归分析,分析台风强度强化程度与SST模型之间的关系,以及检验模型残差的分布。通过数据提供的台风轨迹的增强率,来检验SST对台风强度变化的影响。【结果】建立台风强化值与SST之间的回归模式,平均而言,平均SST每增加1℃,台风强度强化度增加12.5%。该模型具有统计学意义,即台风高强度强化值与高海温值相关。【结论】本研究建立的统计模型对南海台风强度的预报有较好的指示效果。  相似文献   

12.
南海北部渔场表层沉积物中的硫化物   总被引:1,自引:0,他引:1  
为了给南海北部渔场的资源和环境保护提供基础数据,用碘量法测定了南海北部陆架区表层沉积物中硫化物含量.结果表明,全部28份样品中硫化物含量为3.3~42.2mg/kg(干重,下同),平均为12.1mg/kg,符合外海含量低的一般规律,明显低于沿岸海湾的含量,远低于日本渔业环境质量标准(200mg/kg)和安全下限值(400mg/kg).硫化物含量在测站间和不同区域间存在一定差异,南北方向呈近岸(13.1mg/kg)略高于离岸(12.1mg/kg)、离岸略高于远岸(11.1mg/kg)的梯度分布,但梯度差异不显著(p>0.10);东西方向的分布特点是粤西海域(23.7mg/kg)>海南岛以东(15.3mg/kg)>台湾浅滩(9.4mg/kg)≈粤东海域(8.7mg/kg)≈珠江口外海域(8.6mg/kg).空间分布不太均匀主要是受沉积物类型的影响,与陆源硫化物输入的关系不大.  相似文献   

13.
INTRODUCTIONBiofoulingcancauseroughnessofsubmergedsurfacesofmarinestructures(Chakrabarti,1991),increasehydrodynamicloadings(WolframandTheophanatos,1985),acceleratecorrosionprocess(Patiletal.,1988),andimpedeunderwaterinspectionandmaintenance(Houghton,1978).Thelackofd…  相似文献   

14.
xiODUonONThemaoreleInent(oxygen)ofldeinthemarineeresySteInisCycledalongapartho-larrouteinWhwhthethetcanbedrawnfromtheexternlenvirDnmentintoorgan-isim,andthenberetumedtotheenvbonmentfromtheorganisrns.TheDocontentinseawatCfisinIlUentalbyorganisms,imtS,temPeratureandoxidation.So,studyonDoisoftoortanceinoasnographyastheDofluxisofgreatsignfonceinmarinebiogeochdricalcydes.'MareRIAnooMEmOorlnthisstudy,datafroml98O~l992multi-disdplinaryinvestigationsinthecenthel,northeastem,andsouthernSrswe…  相似文献   

15.
mODUCnONGravityflowsedimentationonthenorthwsterncontinentalsl0PeoftheSOuthChinaSea(SCS)are0fgreatinterestfromthescientificandengineeringP0intofview-Th0roughknOWedgofcontinentalsloPepmeessesanddepositionfeatUresispreregUisiteforhydID-carbenexploraion0fdeepwaerandforprotectionofoffhoredrineeopneeringstrUcbes(PlaifonnsandpiPelines)againstnaedhed.ManykindsofmassmovmentPIDCess-eswerefoUndtobeactiveonthen0rthernSCS(Damuth,l979;l98O).High-freqUency(3.5ffo)echo-chaIaCterInaPPingisawell…  相似文献   

16.
南海我国可管辖的海域面积近 2 0 0万km2 ,具有丰富的生物、油气、矿产等资源 ,是我国经济与社会可持续发展的强大支持和保障因素 ,具有海域面积大、资源丰富、区位优势明显、未来开发潜力大等特点。应从强化“寸海寸金”的海洋国土意识出发 ,通过创新管理体制和运行机制 ,建立强有力的海上统一执法队伍 ,按照统一规划、相对集中、由远及近的原则实施重点区域开发战略 ,全面提升南海国土资源开发利用的水平和效益  相似文献   

17.
Water masses in the South China Sea (SCS) were identified and analyzed with the data collected in the summer and winter of 1998. The distributions of temperature and salinity near the Bashi Channel (the Luzon Strait) were analyzed by using the data obtained in July and December of 1997. Based on the results from the data collected in the winter of 1998, waters in the open sea areas of the SCS were divided into six water masses: the Surface Water Mass of the SCS (S), the Subsurface Water Mass of the SCS (U), the Subsurface-Intermediate Water Mass of the SCS (UI), the Intermediate Water Mass of the SCS (I), the Deep Water Mass of the SCS (D) and the Bottom Water Mass of the SCS(B). For the summer of 1998, the Kuroshio Surface Water Mass (KS) and the Kuroshio Subsurface Water Mass (KU) were also identified in the SCS. But no Kuroshio water was found to pass the 119.5°E meridian and enter the SCS in the time of winter observations. The Sulu Sea Water (SSW) intruded into the SCS through the Mindoro Channel between 50–75 m in the summer of 1998. However, the data obtained in the summer and winter of 1997 indicated that water from the Pacific had entered the SCS through the northern part of the Luzon Strait in these seasons, but water from the SCS had entered the Pacific through the southern part of the Strait. These phenomena might correlate with the 1998 El-Niño event.  相似文献   

18.
琼东近海浮标污损生物研究   总被引:1,自引:0,他引:1  
为了解南海北部近海石油开发区的污损生物状况,对海南岛东部近海海区的两个浮标及其锚锭系统上的污损生物进行了调查。结果表明,该海区污损生物的种类主要是藻类、水螅、有柄蔓足类和牡蛎;南海沿岸水域常见的无柄蔓足类仅出现在距海南岛相对较近的J2浮标站。并探讨了该海区的污损生物群落结构与邻近沿岸水域的差异。  相似文献   

19.
mODUCnONTheSOuthChinaSea(SCS)isasend-enclosedoceanbasinlocatednearthewesternPeripheryofthePacificOcean.SpreadingfIDmtheeqUatorto20"Nands~ngzonallaboutl5'inlooptUde,theSCSlocatesbetweenthesouthChinacoastandtheInaritha6continent,andissurroundedbyInanislandcountries.Duringwinter,S0UthwwhmedngcoldSUrges,mwhfiedbytheSST,affectthepressure,tempethe,andwindfieldsneartheInaritimecontinent,andsomeInayeveninIluencetheS0uthernHdrispheremonsoon(Davids0netal.,1983).msuniqUegeOpophyoftheSCS…  相似文献   

20.
Tropical disturbances over the South China Sea (SCS) during the period of 1997-2006 are analyzed using the Tropical Storm and Hurricane WX products. A total of 158 tropical disturbances were formed over the SCS from 1997 to 2006, with 54 developing tropical disturbances which developed into tropical depressions and 104 non-developing tropical disturbances which never developed into tropical depressions. The development rate of tropical disturbances into tropical depressions was 34.18% in these ten years. During the period of this study, total annual numbers of tropical disturbances and developing tropical disturbances over the SCS had significant decreasing trends; however, the development rate of tropical disturbances had an insignificant increasing trend.  相似文献   

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