A western boundary current east of New Caledonia: Observed characteristics     

Florent Gasparin  Alexandre Ganachaud  Christophe Maes 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(9):956-969

Waters from the South Equatorial Current (SEC), the northern branch of the South Pacific subtropical gyre, are a major supply of heat to the equatorial warm pool, and have an important contribution to climate variability and ENSO which motivated the Southwest Pacific Ocean and Climate Experiment (SPICE, CLIVAR/WCRP). Initially a broad westward current extending from the equator to 30°S, the SEC splits upon arriving at the major islands and archipelagoes of Fiji (18°S, 180°E), Vanuatu (16°S, 168°E), and New Caledonia (22°S, 165°E), resulting in a complex system of western boundary currents and zonal jets that feed the Coral and Solomon Seas. We focus here on the formation of one specific jet feeding the Coral Sea, the North Caledonian Jet (NCJ). Using a combination of recent oceanographic cruises, we describe the ocean circulation to the northeast of New Caledonia, where the SEC forms a western boundary current that ultimately becomes the NCJ. This current, which we document for the first time and propose to refer to as the East Caledonian Current (ECC), has its core located 10-100 km off the east coast of New Caledonia, and extends vertically to at least 1000 m depth. Water mass properties show continuous westward transports through the ECC, from the SEC to the NCJ in both the South Pacific Tropical Waters in the thermocline and Antarctic Intermediate Waters near 700 m depth. The ECC extends about 100 km horizontally; its average 0-1000 m transport was estimated at 14.5±3 Sv off the north tip of the New Caledonian reef, with a maximum of 20 Sv in May 2010. South of that the upstream branch of the ECC east of the Loyalty is close to 8 Sv suggesting an important additional contribution from central Pacific waters carried by the SEC at 16°S and diverted to our region through the western boundary current system east of Vanuatu.  相似文献   

静力触探技术在东海陆架工程勘察中的应用研究     

陈培雄  刘奎  吕小飞  李冬  王振红 《海洋学研究》2011,29(4):71-76

通过对东海大陆架海底浅表层土样的静力触探参数进行统计分析,得到该区域细砂、粘土、淤泥质土和淤泥的静力触探统计值,建立了研究海区基于静力触探参数的土类判别图,可用于快速判定土的类别.根据静力触探参数,并应用经验公式估算了海底粘性土的抗剪强度和灵敏度,对估算公式经验系数选择进行了深入研究,提出在研究海区应用经验公式进行粘性...  相似文献   

中国东海和韩国马山湾海域2株原甲藻的形态结构和分子序列比较   总被引：2，自引：0，他引：2  

王红霞  陆斗定  黄海燕  夏平  戴鑫烽  Jeanette G 《海洋学研究》2011,29(1):42-48

对采自我国东海温岭海域和韩国南部马山湾海域的2株原甲藻进行了藻种分离、纯化培养及rDNA ITS分子序列的PCR扩增与测序,并运用显微镜、扫描电镜、Jukes-Cantor距离矩阵及构建的系统发育树,比较研究了2株原甲藻的形态结构和分子序列.结果表明:温岭藻株(LAMB090508)和马山湾藻株(PDKS0206)具有...  相似文献   

海上复杂卫星断块油田开发实践与认识——以JZ油田东区为例     

金宝强  赵春明  张迎春  童凯军  熊煜 《海洋地质译丛》2011,(4):34-37

JZ油田东区是JZ油田的卫星区块,具有典型复杂断块的特征。针对研究区构造复杂、储量风险大及海上开发成本高等特点,运用勘探思维,深入研究油源、疏导体系及储盖组合等成藏条件,明确提出该区的成藏模式,并确定了油田滚动开发的思路。在油田开发的过程中,结合地震、电测及油藏数值模拟等手段,对研究区开展了多轮次的精细地质油藏一体化研究,使油田开发取得了较好的效果。  相似文献   

登州浅滩海域表层沉积物分布特征     

董超  吴建政  朱龙海  胡日军  张伟 《海洋地质前沿》2011,(8):8-15

依据2010年在登州浅滩海域采集的沉积物样品资料,划分了研究区表层沉积物的分布类型,分析了登州浅滩海域沉积物的分布特征和粒度参数变化规律,在此基础上初步探讨了沉积物分布的影响因素.研究结果表明,登州浅滩海域表层沉积物主要包括砾石、砾砂、粗砂、中粗砂、中砂、细砂、粉砂质砂、砂质粉砂、粉砂、黏土质粉砂、粉砂质黏土等11种类...  相似文献   

Trophic ecology of small yellow croaker (Larimichthys polyactis Bleeker): stable carbon and nitrogen isotope evidence     

����  ��ѩ��  ������  ��ʥ�� 《中国海洋湖沼学报》2011,29(5):1033-1040

The trophic ecology of the small yellow croaker (Larimichthys polyactis) was studied using stable isotope analyses. Samples were collected from July to September 2009 and 34 individuals from eight sites were examined for stable carbon and nitrogen isotopes. Stable carbon isotope ratios (δ13C) ranged from -20.67 to -15.43, while stable nitrogen isotope ratios (δ15N) ranged 9.18-12.23. The relationship between δ13C and δ15N suggested high resource partitioning in the sampling area. Significant differences in stable isotope values among the eight sampling sites may be linked to environmental diversities involving various physical processes (such as ocean current, wind and tide) and different carbon sources. Furthermore, the stable isotope ratios may also explain the ontogenetic variability in diet and feeding, because δ13C and δ15N varied significantly with increasing body size. The findings are consistent with other studies on diet analyses in small yellow croaker. It was also demonstrated that stable isotope analysis could be used to estimate the trophic characters of small yellow croaker in feeding patterns and migrating habits.  相似文献   

Dissolved organic matter and its role in red tide succession in the East China Sea in spring     

������  ����� 《中国海洋湖沼学报》2011,29(4):795-799

Dissolved fluorescent organic matter was measured using fluorescence excitation-emission matrix spectroscopy at three temporal points during a Synechococcus bloom after diatom bloom dispersion in spring, 2007. Carbohydrate and dissolved organic carbon were also analyzed. The relationship between organic matter and red tide succession was examined. The results show that after the diatom bloom, tyrosine-like fluorescence B intensity was very high within the water column and exhibited a negative correlation wi...  相似文献   

基于贴现率的东黄海鲐鱼动态生物经济模型分析     

王雅丽  陈新军  李纲 《地理研究》2011,33(9)

渔业资源是一种可再生资源,其资源的可持续利用不仅与其种群大小有关,而且还与作业规模、单位作业的经济成本和贴现率等有关。传统生物经济模型通常忽视了贴现率对渔业资源配置的影响。本文根据1999年-2009年中、日、韩三国在东黄海捕捞的鲐鱼渔获量以及生产成本数据,结合贴现率和渔获价格等数据,构建基于贴现率的东黄海鲐鱼动态生物经济模型。结果表明,贴现率为10％,30％时,短期利益占长期利益的10％～20％．渔获价格在（2327—4654）元／t时,可保证鲐鱼渔获量低于最大可持续产量,从而有效地控制捕捞强度,确保鲐鱼资源的可持续利用。  相似文献   

东盟国家农业发展水平的差异性分析     

张磊  王秋龙  娄昭 《世界地理研究》2011,20(1):50-55

中国与东盟的农业合作正在不断加深,这一过程中必须关注东盟国家农业发展的非均衡性。为定量考察东盟10国农业发展的差异程度,选取东盟10国的8项农业发展指标,采用系统聚类的方法进行分析,根据分析结果,结合各国的自然地理特征,把东盟10国分为农业人口大国、农业人口小国2个大类和农业不发达小国、非农业小国、农业较发达大国、农业不发达大国、群岛型农业大国5个亚类,并进一步阐述了各类国家的农业发展特点。  相似文献   

东昆仑迪木那里克铁矿地质特征与找矿标志   总被引：1，自引：0，他引：1  

胡秀军  夏昭德  丁海波  张朋 《亚热带资源与环境学报》2011,6(2):49-53

迪木那里克铁矿位于阿尔金大断裂南侧,矿体主要赋存于中-上奥陶统祁曼塔格群浅变质的碎屑岩-火山碎屑岩中.矿体多呈似层状、条带状产出,部分矿体塑性变形较强,矿体与地层产状基本一致,层控作用比较明显;矿石主要为条带状石英-磁铁矿和块状磁铁矿矿石;矿石品位较低（TFe=20%～40%）;围岩蚀变特征明显.该铁矿属沉积变质型铁矿...  相似文献