南海东沙群岛南侧海域的潮余流特征

为分析南海东沙群岛南侧海域次表层潮余流特征,基于布放在该海区的锚碇潜标海流资料,利用T-TIDE调和函数和低通滤波等方法,实现潮流调和常数的提取和余流的分离。该海区次表层潮流分潮K1,Msm,O1,M2和Ssa为主要分潮,各分潮东分量振幅大于北分量振幅。研究表明:潮流东西向运动强于南北向;各分潮振幅随深度变化不一致,造成潮流类型在不同深度上有所变化;二月平均余流出现相对异常现象,流速相对较大,可达83.65cm/s。次表层月平均余流变化与南海季风的盛衰有较好的对应关系,季风对该海区影响可达次表层深度。结合相应的温盐数据和高度计资料发现,余流异常与经过该海区的反气旋涡有关,涡旋改变了该海区原有的水体结构。     

南海北部三参量风浪频谱数值模拟

基于Open FOAM开源程序,采用侯一筠的三参量风浪频谱构造了适用于中国南海北部海域的不规则波浪。首先,在waves2Foam程序中开发了解析松弛法进行消波处理并选用速度入口法造波,进而选用JONSWAP谱进行计算以验证不规则波造波程序的准确性;其次,以适用于中国南海北部海域的三参量风浪频谱为理论基础进行编程,将三参量风浪频谱嵌入到waves2Foam程序中,替换JONSWAP谱,通过设定风区长度、风速等参量构造模拟南海北部的不规则波浪。经验证,构造的不规则波的模拟值与理论值之间的误差在精度允许范围内,表明该方法能较好地模拟南海北部真实海况下的不规则波浪。     

最后一位戴罪的功臣

既然中国近代史是从1840年鸦片战争算起,禁烟英雄林则徐就是近代史上第一人。可惜这个第一英雄刚在南海点燃硝烟的烈火,就被发往新疆接受朝廷给他的处罚。功与罪在瞬间便交织在一个人身上,将其扭曲再造,像原子裂变一样,产生出一个意想不到的结果。     

南海“U形线”内岛屿主权法律问题研究

本文通过介绍当前我国在南海活动的现状引出我国对南海＂U形线＂岛屿所享有的主权,再从法理学的角度论证南海＂U形线＂内岛屿主归属我国的理论依据,最后提出了维护该项权利的价值及其相关建议。     

晚更新世间冰期时的南海海平面

从海蚀平面，晚更新世海积地面及其沙坝下伏的滨海相粘性土顶界高程等来看，距今约２０３万ａ的间冰段时南海高海面及其北部岸线接近现在的情况。晚更新世与全新世形成的海蚀平台类高，老，新沙坝比邻和类高，这是南海北部海岸的地貌的特色。     

海生贝类壳体生长层的高分辨率同位素记录研究——以南海北部典型贝类为例

对南海北部贝壳生长层高分辨率分析表明,贝壳生长率、成分和同位素组成存在着显著的季节性变化和趋势变化,季节性变化主要是气候变化所致,而趋势变化主要反映贝类的生理趋势.由于大多数贝类成年后的生长比较缓慢,所以在整个生长序列中都存在生理趋势,分离生理趋势后可获得环境的季节性变化.与环境变量对比分析表明,贝壳氧同位素组成季节性变化主要受海温影响,并与之有较好的相关性,因而是高分辨率研究海洋环境的替代性指标.在本研究的贝类中,鳞砗磲与海蜗牛氧和碳同位素的变化基本是同步的,并且与温度的季节性变化有较好的相关性,指示着在温度控制下它们的氧碳同位素发生了平衡分馏,而褐带鹑螺则相反,意味着其碳同位素还可能受代谢作用的影响.     

Reconstruction of surface ocean water <Emphasis Type="Italic">p</Emphasis>CO<Subscript>2</Subscript>(aq) in Nansha area,the South China Sea during the last 30 ka

The reconstruction of pCO2 in the tropic ocean is one of the most important issues to understand global climatic changes.In this study,the high-resolution stratigraphic analysis of core 17962 was conducted,which is Iocated in the southern South China Sea(SCS).The contents of sedimentary organic matter,the stable carbon isotopic composition of sedimentary organic matter,and the δ^13C values of black carbon and terrigenons n-alkanes were determined.And the δ^13Cwc value of carbon derived from aquatic was calculated.On the basis of δ^13Corg-pCO2equation proposed by Popp et al.(1989),we estimated the pCO2 in the Nansha area,SCS,since the last glaciation using δ^13Cwc instead of δ^13Corg.The results show that the average pCO2 was estimated at 240 ppm V during the last glaciation,and at 320ppm V in the Holocene.A comparison of surface sea pCO2 with the atmosphere CO2 recorded in the Vostok ice core,indicates that CO2 in surface water of the southern SCS could emit into atmosphere during the last 30ka.     

南海季风低压发生发展机制的探讨

根据FGGEⅢB资料,对发生在1979年8月中旬的一次南海季风低压过程,利用ω方程和Kuo(1974)的积云对流参数化方案进行了诊断研究.结果表明:决定南海季风低压发生发展的物理过程是潜热加热,尤以积云对流的作用最显著,温度平流和涡度平流也起一定作用,其它物理因子贡献较小.南海季风低压是通过积云对流和大尺度环境场的反馈作用而发展增强的,可认为,CISK机制是低压发生发展的主要机制.     

南海专业镇技市创新服务体系之调查——以五金和有色金属专业镇为例

南海是我省专业镇的主要聚集地区之一，经过多年的发展，其技术创新服务平台已由单一的服务转向产品检测、商务网站、行业协会等多方面的服务，由政策导向转向市场导向，由完全的公益型组织管理模式向企业型管理转变，已经具备了技术创新服务体系的雏形。本文以丹灶五金专业镇和大沥有色金属专业镇为例，介绍南海技术创新服务体系的建设情况。     

Environmental and biogeo-chemical process of accumula-tion of iron-phosphorus in marine sediments

This paper discusses the environmental andbiogeochemical process of accumulation of iron-phosphorusin marine sediments for the north aktian of the South ChinaSea and analyzes the relationships between the contents ofiron, phosphorus and calcium carbonate as well as their ex-istent characteristics. The results show that the variances ofphosphorus and calcium carbonate contents with depths areopposite and those of iron and calcium carbonate contentsare almost accordant. It is not only related to the biogeo-chemical process of accumulation of biogenous calcium car-bonate in sediments, which resulted from the fact that themarine primary productivity was stimulated by part of ter-rigenous phosphorus dissolved into seawater due to declineof superficial water temperature and increase of carbon di-oxide content in the glacial period, but also related to ironimpelled oxidation and accelerated deposit by the dissolvedoxygen from the atmosphere and the photosynthesis of hy-drophytes in seawater. The variance of soluble iron-phos-phorus species (Fe-P) in sediment columns can sensitivelyreflect the changes of climate and environment, which sug-gests that the accumulative characteristics and existent statesof iron-phosphorus species (Fe-P) in marine sediments havethe significance as an indicator of the changes of paleocli-mate and paleoenvironment.