论证南海海疆国界线   总被引：2，自引：0，他引：2  

王颖  葛晨东  邹欣庆 《海洋学报(英文版)》2017,36(4):1-12

According to a series of important historical maps,i.e.,the Location Map of the South China Sea Islands,the Nansha Islands,Zhongsha Islands,Xisha Islands,Yongxing Island and Shidao Island,and Taiping Island(archived by the Territorial Administration Division of the Ministry of Interior of Republic of China in 1946),and the Administration District Map of the Republic of China published in 1948,the dashed line surrounding the South China Sea Islands represents China's sea boundary in the South China Sea at that time.It was both connected with,and an extension of,the land boundary of China.At that time the dashed line was used to represent the waters boundaries while the solid line was used to represent the land boundary—a universal method used in maps that was then recognized internationally.The above observation provides historical and scientific evidence of China's sea boundary in the South China Sea that is useful for the international maritime delimitation over the South China Sea area.  相似文献   

近年来人类活动影响下长江河口的变化模式     

王成龙  赵一飞  邹欣庆  许鑫王豪  葛晨东 《海洋学报(英文版)》2017,36(4):87-96

To evaluate the controlling factors for coastline change of the Changjiang(Yangtze River) Estuary since 1974,we extracted the mean high tide line from multi-temporal remote sensing images that span from 1974 to 2014 at 2-year intervals.We chose 42 scenes to constrain the changing pattern of the Changjiang Estuary coastline,and implemented GIS technology to analyze the area change of the Changjiang(Yangtze) Subaerial Delta.Runoff,sediment discharge and coastal engineering were withal considered in the analysis of the coastline changes.The coastline has transgressed seaward since 1974,and a part of it presents inter-annual variations.The area of the Changjiang Subaerial Delta increased by 871 km2,with a net accretion rate of 21.8 km2/a.Based on the change of sediment discharge due to the major projects in the Changjiang River Basin,we divided the changing pattern of the coastline into three stages:the slow accretion stage(1974–1986),the moderate accretion stage(1987–2002),and the rapid accretion stage(2003–2014).Liner regression analysis illustrated that there is a significantly positive correlation between the area changes and sediment discharge in the Chongming Eastern Shoal and Jiuduansha.This suggested that sediment load has a fundamental effect on the evolution of the Changjiang Estuary.Construction of Deep Waterway in the North Passage of the Changjiang River(1998–2010) led to a rapid accretion in the Hengsha Eastern Shoal and Jiuduansha by influencing the hydrodynamics in North Passage.Coastal engineering such as reclamation and harbor construction can also change the morphology of the Changjiang Estuary.We defined a contribution rate of area change to assess the impact of reclamation on the evolution of Changjiang Estuary.It turned out that more than 45.3% of area increment of the Changjiang Estuary was attributed to reclamation.  相似文献   

苏北滨海湿地互花米草潮滩CO₂,CH₄和N₂O通量的日变化规律     

许鑫王豪  傅光翮  邹欣庆  葛晨东  赵一飞 《海洋学报(英文版)》2017,36(4):105-113

The invasions of the alien species such as Spartina alterniflora along the northern Jiangsu coastlines have posed a threat to biodiversity and the ecosystem function.Yet,limited attention has been given to their potential influence on greenhouse gas(GHG) emissions,including the diurnal variations of GHG fluxes that are fundamental in estimating the carbon and nitrogen budget.In this study,we examined the diurnal variation in fluxes of carbon dioxide(CO_2),methane(CH_4),and nitrous oxide(N2O) from a S.alterniflora intertidal flat in June,October,and December of 2013 and April of 2014 representing the summer,autumn,winter,and spring seasons,respectively.We found that the average CH_4 fluxes on the diurnal scale were positive during the growing season while negative otherwise.The tidal flat of S.alterniflora acted as a source of CH_4 in summer(June) and a combination of source and sink in other seasons.We observed higher diurnal variations in the CO_2 and N_2O fluxes during the growing season(1 536.5 mg CO_2 m~(–2) h~(–1) and 25.6 μg N_2O m~(–2) h~(–1)) compared with those measured in the non-growing season(379.1 mg CO_2 m~(–2) h~(–1) and 16.5 μg N_2O m~(–2) h~(–1)).The mean fluxes of CH_4 were higher at night than that in the daytime during all the seasons but October.The diurnal variation in the fluxes of CO_2 in June and N_2O in December fluctuated more than that in October and April.However,two peak curves in October and April were observed for the diurnal changes in CO_2 and N_2O fluxes(prominent peaks were found in the morning of October and in the afternoon of April,respectively).The highest diurnal variation in the N_2O fluxes took place at 15:00(86.4 μg N_2O m~(–2) h~(–1)) in June with an unimodal distribution.Water logging in October increased the emission of CO_2(especially at nighttime),yet decreased N_2O and CH_4 emissions to a different degree on the daily scale because of the restrained diffusion rates of the gases.The seasonal and diurnal variations of CH_4 and CO_2 fluxes did not correlate to the air and soil temperatures,whereas the seasonal and diurnal variation of the fluxes of N_2O in June exhibited a significant correlation with air temperature.When N_2O and CH_4 fluxes were converted to CO_2-e equivalents,the emissions of N_2O had a remarkable potential to impact the global warming.The mean daily flux(MF) and total daily flux(TDF) were higher in the growing season,nevertheless,the MF and TDF of CO_2 were higher in October and those of CH_4 and N_2O were higher in June.In spite of the difference in the optimal sampling times throughout the observation period,our results obtained have implications for sampling and scaling strategies in estimating the GHG fluxes in coastal saline wetlands.  相似文献   

第四纪气候事件的孢粉记录   总被引：6，自引：0，他引：6  

童国榜  羊向东 《海洋地质与第四纪地质》1998,18(3):13-22

通过总结我国不同区域现有孢粉资料,发现第四纪孢粉植物群的演化序列中明显地存在与演化趋势和周期不符的孢粉植物群事件。归纳起来有三种类型：延续时间约万年的孢粉植物群突变事件;延续时间数千年的孢粉植物群贫乏事件和延续时间几百年的孢粉植物群颤动事件。突变事件有４起：Ｂｅｔｕｌａ－Ａｒｔｅｍｉｓｉａ事件（２．５ＭａＢ．Ｐ．）;Ａｒｔｅｍｉｓｉａ－Ｇｒａｍｉｎｅａｅ事件（１．４ＭａＢ．Ｐ．）;Ｅｐｈｅｄｒａ－  相似文献   

全球和区域水深图生产的进展     

Anderasen  里弼东 《海洋测绘》1998,(3)

本文叙述了在促进水深图生产方面所开展的工作情况。包括国际海道测量组织(IHO)在目前和历史上对大洋水深图(GEBCO)的作用、政府间海洋学委员会(IOC)在开发区域海底地形图方面与IHO合作中所做的工作。由摩纳哥Alben一世国王发起的GEBCO到现在已经是第五版了,这一版是以数字光盘形式出版的DEBCO数字海图集。  相似文献   

离子交换-比色法测定农业地质普查样品中的微量碘(Fe3+-CNS--NO-2)     

尹春梅  王佳丽  潘克臣  郑昱东 《吉林地质》2005,24(2):127-129

本文采用离子交换-比色法测定农业地质样品中的微量碘,本方法检出限为0.5×10-6,精密度达到2.4%.方法准确、快速、简便、成本低,适合大批量样品的测定.  相似文献   

基于iData的CAD基础数据整理入库技术研究     

陈东东 《测绘与空间地理信息》2022,45(1):132-134

基础数据入库是建设数字城市的重要环节,本文主要论述了CAD基础数据入库会出现的一些问题.在此基础上,采用基于iData的数据入库技术,结合实际生产项目,得出结论:该技术方法能够解决传统技术存在的问题.  相似文献   

叠加速度成图在CPS3绘图系统中的实现   总被引：1，自引：0，他引：1  

王磊  林建东 《煤田地质与勘探》2000,28(5):59-60

基于CPS3绘图系统的工作原理和常规时深转换,针对目的层埋藏深,速度横向变化大,钻孔资料少的三维勘探区,摸索出了一套由叠加速度出发进行时深转换的方法。此方法成功地应用于华北煤田TSK勘探区的三维资料解释中,弥补了传统时深转换方法的不足,收到了很好的效果,所绘制的构造图深度同巷道资料吻合。   相似文献   

卫星导航欺骗式干扰技术现状及展望     

高扬骏  吕志伟  周朋进  贾铮洋  张伦东  丛佃伟 《测绘与空间地理信息》2019,42(10)

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南海东部管事海山铁锰结壳的矿物组成和地球化学特征     

刘兴健  唐得昊  阎贫  葛晨东 《海洋地质与第四纪地质》2019,39(3)

对于开阔大洋海山结壳的矿物组成和地球化学特征研究已经比较深入,但对边缘海海山铁锰结壳的研究却较少。以在南海东部管事海山上采集的两块铁锰结壳为研究材料,对其进行了X射线衍射、扫描电镜及电子探针微区的分析,结果显示结壳矿物以水羟锰矿为主,含有少量针铁矿,碎屑矿物主要是石英和长石。结壳的显微结构呈现条带状分布,有10～15μm长的空隙和0.5μm直径大小的孔洞。相对于大洋结壳,结壳的Mn含量较高,与马尼拉海沟附近火山喷发物质有关,但Cu、Co和Ni含量更低,可能与边缘海沉积速率高或有机络合物吸附有关。矿物组成及元素比值表明结壳主要是水成的,但未发生明显磷酸盐化作用。元素比值和相关性表明,Mn主要来源于南海扩张停止后火山喷发、玄武岩风化形成溶解Mn;Fe与Si元素均来自火山碎屑、生源物质和陆源物质,还受到管状蠕虫吸附的影响。南海管事海山结壳是在富氧环境中上升流作用下选择性吸附水体中溶解化学元素缓慢沉积而成。结壳中元素含量随时间变化趋势反映了南海的古环境变化。  相似文献