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Autumn intensification of the ryukyu Current during 2003-2007

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Science China Earth Sciences 2010年第4期53卷 603-609页

作者： ZHU Xiao-Hua HUANG DaJi GUO XinYu State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic AdministrationHangzhou 310012China Center for Marine Environmental Study Ehime University2-5 Bunkyo-choMatsuyama 790-8577Japan

Inverse calculations using data from 16 repeat hydrographic transects collected from April 2003 to June 2007 have yielded velocity structures and volume transports(VTs) of the ryukyu Current in the region east of the northern ryukyu *** inverse calculation results show that the ryukyu Current is dominated by a subsurface velocity core with maximum velocities from 15.1 to 80.0 cm/s,whose positions vary between 110 and 600 dbar and 27.2°-28.2°N along the *** mean velocity exhibits a subsurface velocity core with a maximum value of 24.6 cm/s at 326 dbar depth,a VT of 14.0 Sv(1 Sv≡106 m3/s),a vertical dimension of 800 m,and a horizontal dimension of 60 *** seasonal mean velocities show that the ryukyu Current is stronger in autumn than in other *** is suggested that this seasonal variation is coincident with the intensification of the anticyclonic eddy south of Shikoku,Japan.

关键词： ryukyu Current inverse technique subsurface maximum velocity core volume transports seasonal variation

Seismic detection of the X-discontinuity beneath the ryukyu subduction zone from the SdP conversion phase

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Earth and Planetary Physics 2018年第3期2卷 208-219页

作者： QingHui Cui WenLan Li GuoHui Li MaiNing Ma XiaoYu Guan YuanZe Zhou Key Laboratory of Computational Geodynamics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of Sciences

The X-discontinuity,which appears at the depth of approximately 300 km,is an important seismic interface with positive velocity contrasts in the upper *** its presence and topography can be useful to understand phase transformations of relevant mantle minerals under the high-temperature and high-pressure circumstance of the Earth's *** this study,we detect the X-discontinuity beneath the ryukyu subduction zone using five intermediate-depth events recorded by the dense Alaska Regional Network(AK).The X-discontinuity is successfully revealed from the robust slant stacking of the secondary down-going and converting Sd P *** the depth distribution of conversion points,we find that the X-discontinuity's depth ranges between 269 km and 313 km,with an average depth of 295 *** the conversion points are located beneath the down-dipping side of the Philippine Sea *** energy comparisons in vespagrams for observed and synthetic seismograms,the strong converted energy is more likely from a thin high-velocity layer,and the S-wave velocity jumps across the X-discontinuity are up to 5% to 8% with an average of 6.0%.According to previous petrological and seismological studies,the X-discontinuity we detected can be interpreted as the phase transformation of coesite to stishovite in eclogitic materials within the oceanic crust.

关键词： ryukyu subduction zone X-discontinuity coesite-stishovite transformation dense network SdP conversion phase

WAVENUMBER AND DEPTH PROPERTIES OF TEMPERATURE FINESTRUCTURE IN THE REGION AROUND THE ryukyu ISLANDS

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Chinese Journal of Oceanology and Limnology 1999年第3期17卷 258-264页

作者：鲍献文吴克俭罗义勇 College of Physical and Environmental Oceanography Ocean University of Qingdao Qingdao China

Forty two CTD profiles gathered in summertime of 1997 were used for finestructure studies around the ryukyu Islands indicating that finestructure properties varied with depth; and that the wavenumber spectra density is a negative (-3～-4) power function of the wavenumber in the high wavenumber range. The identical finestructure spectral features in different stations indicate considerable water exchange through the Kerama Trench. The wavelet spectrum’s spatial structure and intermittency is related to the vertical mixing of water.

关键词： finestructure spectrum wavelet ryukyu Islands

THE HYDROGRAPHIC FEATURES OF THE OCEAN REGION AROUND THE ryukyu ISLANDS DURING SUMMER OF 1997

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Chinese Journal of Oceanology and Limnology 1998年第4期16卷 317-325页

作者：罗义勇鲍献文吴德星 Institute of Physical Oceanography Ocean University of Qingdao Qingdao

Study of CTD data collected by the R/V DONG FANG HONG 2 in a 1997 summercruise in the ocean region around the ryukyu Islands showed: 1) the existence, in the upper layer, of ahigh salinity water (HSW) core at about 200 dbar, and a low salinity water (LSW) core, centered atabout 700 dbar on the Pacific Ocean side of the ryukyu Ridge, and located shallower on the East Chinafor (ECS) side; 2) the existence, in the upper layer, of warm water regions (WWR) west of Amami Is-land and Ishigaki Island, and a cold water region (CWR) east of Okinawa Ieland; in the lower layer, ofa CWR (WWR) southwest (southeast) of Okinawa Island; 3) the intrusion of North Pacific IntermediateWater into the ECS through the Kerama Trench located south of Okinawa Island and the strait east of Tai-wan Island.

关键词： ryukyu Islands hydrographic features HSW LSW WWR CWR

The American Rejuvenation Policy of ryukyu Traditional Culture and Its Transformation in the Early Period of Occupation

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World History Studies 2019年第1期6卷 36-56页

作者： Sun Jiashen Tsinghua University BeijingP.R.China

Based on the observation of the ryukyu ethnic group during the World WarⅡand the need for post-war military occupation,the United States formulated the rule of“*** separating from the Japan,strengthening the initiative of natives.”1 in the early days of the occupation of *** the field of culture,the United States has carried out activities such as the compilation of post-war textbooks,attempts to restore native language,protection of traditional art and historical sites,and they also revived the traditional culture of *** then,due to the transformation of the ***-Pacific strategy,the U.S.’s traditional culture policy for ryukyu has gradually changed to allow Japanese culture to re-enter *** ryukyu traditional cultural rejuvenation policy in the early postwar period led to the development and strengthening of the community awareness of the ryukyu community,which had disappeared and been suppressed for a long time.

关键词： ryukyu Cultural Policy U.S.Asia-Pacific Strategy ryukyu Traditional Culture Community Awareness

“有趣”与“真实”之间——英国航海家巴塞尔·霍尔笔下的琉球

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海洋史研究 2021年第1期 126-140页

作者：刘啸虎湘潭大学碧泉书院·哲学与历史文化学院

一巴塞尔·霍尔到访琉球19世纪英国著名航海家巴塞尔·霍尔(Basil Hall,1788-1844),出身苏格兰贵族,1802年加入英国皇家海军,曾多次参加航海远征、科学考察及外交活动。①1816年,他作为英国海军轻型军舰"里拉号"(Lyra)的舰长,指挥该舰... 详细信息

一巴塞尔·霍尔到访琉球19世纪英国著名航海家巴塞尔·霍尔(Basil Hall,1788-1844),出身苏格兰贵族,1802年加入英国皇家海军,曾多次参加航海远征、科学考察及外交活动。①1816年,他作为英国海军轻型军舰"里拉号"(Lyra)的舰长,指挥该舰与另一艘军舰"阿尔切斯特"号[Alceste,舰长为默里·马克斯韦尔(Murray Maxwell,1775-1831)]组成舰队,护送英国阿美士德(William Pitt Amherst)使团访华。舰队经中国东南沿海的香港、澳门、广州等地,一路抵达天津白河口。1816年8月9日,英国使节阿美士德等人登岸,北上觐见清朝嘉庆皇帝,并指示舰队返回广州。但巴塞尔·霍尔的舰队(以下简称"霍尔舰队")却并未直接南返,而是沿中国北方沿海展开勘察测绘。

关键词： ryukyu Basil Hall Napoleon China the West

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琉球群岛附近海域声场分析

琉球群岛附近海域声场分析

作者：代民果浙江大学

学位级别：硕士

水体中各种能量辐射形式中，光波和电磁波的衰减都非常大，传播距离较短，而以声波的传播性能为最好。目前水声技术已是开发海洋和研究海洋广泛采用和行之有效的手段，如水下通讯、声遥测遥控、数据图像传播，以及用声波遥测海洋涡漩的... 详细信息

水体中各种能量辐射形式中，光波和电磁波的衰减都非常大，传播距离较短，而以声波的传播性能为最好。目前水声技术已是开发海洋和研究海洋广泛采用和行之有效的手段，如水下通讯、声遥测遥控、数据图像传播，以及用声波遥测海洋涡漩的运动和变化与全球海洋温度的监测等方面。而这些技术要求进一步研究声波传播规律与海洋环境的定量关系。论文主要作了以下工作。通过数据处理，得出了琉球群岛附近海域声速最小值和及其出现深度的分布规律，研究了横跨和穿越宫古水道两个断面上声场上述特征的变化，探讨了温度分布和声速最小值的分布的关系;研究了单频声源所发出声波在深海的能量传播途径和传播损失，得出不同频率和不同深度对于声传播损失的影响。结果表明在陆架海域声速最小值分布主要受海水表面温度和底层温度控制，其控制范围随季节变化，春、秋季声速最小值分布几乎完全受海水底层温度分布控制;在深海海域，声速最小值分布及其出现深度相对稳定;单频声源声传播损失与声源的垂向位置和频率有关，频率和深度变化对声传播损失影响很大;表层10Hz以上的声波难以在表层传播，且传播损失大。论文的主要创新之处是用数据库资料对琉球群岛附近海域声速最小值及其出现深度作了大面积预估，避免了实测CTD资料站位少、水平分辨率低、易受气候等偶然性影响的不足之处;采用声速最小值分布来分析这一海域的声学性质，而没有采用传统的声速平面分布。并指出东海陆架浅海声速最小值分布主要与海水表面温度和底层温度分布有关;用穿越和横跨宫古水道的两个声速断面揭示陆坡上升流，并以此解释冲绳岛外侧声速最小值和声速最小值深度四季的剧烈变化;同时讨论单频声源声线传播和频率、深度对声传播损失的影响。

关键词： ryukyu minimal sounding speed value depth corresponding to minimal sound speed value deep-water-sound channel sound transmission transmission loss

明清鼎革之际琉球对外邦交在南明与清之间的艰难抉择

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