Sensitivity of the Interannual Kuroshio Transport Variation South of Japan to Wind Dataset in OGCM Calculation   总被引：1，自引：2，他引：1  

Hiroshi Yoshinari  Motoyoshi Ikeda  Kiyoshi Tanaka  Yukio Masumoto 《Journal of Oceanography》2004,60(2):341-350

Numerical experiments were carried out using OGCM (Ocean General Circulation Model), MOM2.2 (Modular Ocean Model Ver. 2.2), over realistic topography data, ETOPO5 (Earth Topography - 5 Minute), to investigate the interannual variability of the Kuroshio transport in 1960–2000 south of Japan; 1) the PN line located off the East China Sea, and 2) the ASUKA (Affiliated Surveys of the Kuroshio off Cape Ashizuri) line located off Cape Ashizuri. We adopted two wind datasets as driving forces of the OGCM: 1) the NCEP/NCAR (National Centers for Environmental Prediction/National Center for Atmospheric Research) reanalysis monthly mean wind stress data, and 2) the ECMWF (European Centre for Medium-range Weather Forecasts) daily wind data. In the ECMWF experiments we replaced the NCEP/NCAR data only in 1979–1993 because of the availability of the data. The OGCMs and observation basically agree on the temporal variation patterns of the transports until 1986 on the PN line with correlation coefficients of about 0.6. During the 1990s, when data were collected on the ASUKA line, the NCEP/NCAR experiments give lower correlation coefficients (less than 0.3), on both PN and ASUKA lines, while the ECMWF experiments have a higher value on the ASUKA line (0.5). One of the reasons for the disagreement between the observations and OGCMs during the 1990s might arise from the NCEP/NCAR data. An additional analysis of a wind-driven circulation was performed to examine the sensitivity of integrated Sverdrup transport along the western boundary to the propagation speed of a baroclinic Rossby wave, which is varied by stratification. A variation of the stratification, which might be induced by variability of air-sea heat and freshwater fluxes, cannot be a main cause of the disagreement. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

南海中部海山性质研究   总被引：4，自引：0，他引：4  

杨金玉  张训华  王修田 《海洋科学》2001,25(7):31-34

南海海底的海山和海丘是南海成过程中的产物，如何理解它们的性质，直接关系到如何构建南海的形成演化机制。通过重力异常场计算、地质剖面模型拟合的方法分析指出南海海山有年轻的大洋玄武岩海山，也有包含了大陆玄武岩的“双性”海山。  相似文献   

东海PN断面黑潮区域声传播数值模拟          下载免费PDF全文

吕连港  袁业立 《海洋科学》2003,27(3):73-76

利用BELLHOP声学模式模拟东海PN断面黑湖区域的声传播，比较夏季和冬季的接收信号。冬季的声速小于夏季的声速，但是信号到达时间小于夏季的到达时间，分析表明冬季的声速梯度小于夏季声速梯度，声线的海面反射次和海底反射次数小于夏季，声线的路程短，声线路程对到达时间的影响超过声速的影响，于是冬季信号早于夏季到达。  相似文献   

高密度电法在工程地质中的应用二例     

李亚东  YANG Gong  尹保忠 《云南地质》2008,27(1):81-85

硅灰石矿和水库工程地质中应用高密度电阻率法,资料数据处理快捷准确,推测拟断面成果可靠。  相似文献   

长江口及邻近海域现代沉积物中正构烷烃分子组合特征及其对有机碳运移分布的指示   总被引：13，自引：1，他引：12  

朱纯  潘建明  卢冰  扈传昱  刘小涯  叶新荣  薛斌 《海洋学报》2005,27(4):59-67

报道了长江口及邻近海域现代沉积物中正构烷烃的浓度及分布特征,通过因子分析法对正构烷烃来源进行了探讨.结果表明,调查站位正构烷烃主要可归纳为3种类型:陆源输入优势型(单峰群)、陆源和海洋内生混合类型(双峰群)和石油类污染类型(单峰型,不具奇偶优势).长江口邻近站位正构烷烃色谱指标的突变,是长江河口区2种不同水团造成沉积物差异的客观反映.除P4外,研究站位总正构烷烃含量(∑n-Alk)与有机碳总量(TOC)相关性良好,且长江口东南-浙江沿岸软泥区正构烷烃的陆源高等植物组分(TER-Alk)、海洋内生组分(PL-1)、奇偶碳优势指数(CPI)等指标与运移距离呈线形关系.在因子分析显示不同来源的4种正购烷烃中,以陆源烷烃输入比重最大(51.5%),在陆源烷烃中又以东海河流物质贡献最大(49.1%);根据因子负荷差异,推测东海北部沉积有机质可能多数来源于苏北沿岸及老黄河口水下三角洲,冲绳海槽区则可能大部分来源于长江及东海内陆架物质,并探讨了其运移机理.  相似文献   

Spatial and temporal variation of particulate organic carbon in the PN section of East China Sea   总被引：4，自引：0，他引：4  

ZHU Zhuoyi  WU Ying  ZHANG Jing  WEI Hao 《海洋学报(英文版)》2005,24(5):89-99

1 IntroductionThe carbon cycle in the ocean, related to theglobal warming and human food, is of great scientificsignificance. Studies for the carbon transfer and trans-formation in the ocean, including the assimilative andmetabolic capacity, have become one of key researchfoci in global biogeochemical studies (Tsunogai et al.,1997; Hu and Yang, 2001; Hansell et al., 2003; Wei etal., 2003; Yang et al., 2004; Yuan et al., 2004).As is known, POC is composed of living fractionsand organic debr…  相似文献   

填石路堤变形观测方案设计与实施   总被引：3，自引：2，他引：1  

彭建国  刘小明  刘江波 《中国岩溶》2005,24(2):135-139

本文介绍了“西部项目”中现场试验路段填石路堤变形观测的设计和实施过程;针对填石路堤进行沉降观测存在的问题与监测中所采用的观测方法和设备进行了讨论,并对其设计及实施过程进行了研究。观测结果分析表明,所提出的实施方案及观测方法可行,结果可靠,对填石路堤变形观测工作有一定的实用价值。   相似文献   

Formal ratification of the Quaternary System/Period and the Pleistocene Series/Epoch with a base at 2.58 Ma     

Philip L. Gibbard  Martin J. Head  Michael J. C. Walker  the Subcommission on Quaternary Stratigraphy 《第四纪科学杂志》2010,25(2):96-102

In June 2009, the Executive Committee of the International Union of Geological Sciences (IUGS) formally ratified a proposal by the International Commission on Stratigraphy to lower the base of the Quaternary System/Period to the Global Stratotype Section and Point (GSSP) of the Gelasian Stage/Age at Monte San Nicola, Sicily, Italy. The Gelasian until then had been the uppermost stage of the Pliocene Series/Epoch. The base of the Gelasian corresponds to Marine Isotope Stage 103, and has an astronomically tuned age of 2.58 Ma. A proposal that the base of the Pleistocene Series/Epoch be lowered to coincide with that of the Quaternary (the Gelasian GSSP) was also accepted by the IUGS Executive Committee. The GSSP at Vrica, Calabria, Italy, which had hitherto defined the basal boundary of both the Quaternary and the Pleistocene, remains available as the base of the Calabrian Stage/Age (now the second stage of the revised Pleistocene). In ratifying these proposals, the IUGS has acknowledged the distinctive qualities of the Quaternary by reaffirming it as a full system/period, correctly complied with the hierarchical requirements of the geological timescale by lowering the base of the Pleistocene to that of the Quaternary, and fully respected the historical and widespread current usage of both the terms ‘Quaternary’ and ‘Pleistocene’. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

龙门山南段二叠系热液白云岩特征   总被引：1，自引：0，他引：1  

付于真  王国芝  陈园园  王英军  边岩庆 《云南地质》2011,30(2):229-233

二叠系白云岩与白云质灰岩、灰岩具有渐变过渡关系。白云岩中斑马状构造发育。白云石多为马鞍状白云石或异形白云石,较围岩显示出低碳、低氧和富锶特征,与典型构造热液成因白云岩一致,强度受构造控制明显,从造山带向盆地方向强度逐渐减弱。  相似文献   

Correlation of the Tournaisian-Visean Boundary Beds     

HOU Hongfei  WU Xianghe  YIN Bao’an 《《地质学报》英文版》2011,85(2):354-365

With the definition and adoption of the Global Stratotype Section and Point (GSSP) for base of the Visean in China, the newly synthesized zonations and correlation of some significant fossil groups: foraminifera, conodont, coral and brachiopoda near the Tournaisian-Visean boundary beds are reviewed, which help in the recognition of the boundary in various sedimentary facies. The occurrence of two physical events, one pre- and one post- the Tournaisian-Visean boundary is emphasized, which allows for recognition of the position close to the Tournaisian-Visean boundary in the field. The regional correlation in southern China and international correlation throughout Eurasia around the Tournaisian-Visean boundary beds with the GSSP is proposed.  相似文献