检索结果-南通市图书馆

Identification and analysis of shear waves recorded by three-component OBSs in northeastern south china {2.

在线全文

学校读者我要写书评

暂无评论

progress in Natural Science:Materials International 2008年第2期18卷 181-188页

作者： Minghui Zhao ,Xuelin Qiu,Shaohong Xia,Ping Wang,Kanyuan Xia,Huilong Xu Key Laboratory of Marginal sea Geology,south china sea institute of oceanology,{2. academy of Sciences,guangzhou 510301,china Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China

Structure models associated with P-and S-wave velocities contain considerable amount of information on lithology and geophysical properties,which can be used to better understand the complexity of the deep crustal structure. However,records of converted shear waves are less due to the speciality of seismic survey at sea and the rigorous generated conditions. The study on shear waves has always been a weakness for studying the deep crustal structures of south {2. sea (SCS). In this paper,eleven three-component OBSs were deployed along the profile OBS-2.01 in northeastern SCS. After the data processing of polarization and band-pass filter,converted S-wave phases were identified in the radical component records of nine OBSs. Taking the OBS7 as an example,identification and analysis of converted shear waves were presented and discussed in detail. A few phase groups,such as PwSc,PgSs,PnSc,PmS,and PwSn,were found coming from the deep crust or Moho interface by simple theoretical model calculation and ray-tracing simulation. The results not only provide the underlying basis for studies of S-wave velocity structure and Poisson’s ratio structure,but also reveal the relationship between crustal petrology and seismology,which will be of importance for making full use of S-wave information in the future.

关键词： Converted shear wave Deep crustal structure Three-component ocean bottom seismometer Northeastern south china {2.

Distribution and identification of the low-velocity layer in the northern south china {2.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

progress in Natural Science:Materials International 2007年第5期17卷 591-600页

作者： Zhao Minghui, Qiu Xuelin, Xu Huilong, Shi Xiaobin, Wu Shimin , Ye Chunming and Xia Shaohong (Key Laboratory of Marginal sea Geology, south china sea institute of oceanology, {2. academy of Sciences, guangzhou 510301, china Earthquake Administration of guangdong province, guangzhou 510070, china) [a]Key Laboratory of Marginal sea Geology South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou China [b]Earthquake Administration of guangdong province Guangzhou China

The low-velocity layer (LVL), closely related with tectonic activities and dynamic settings, has always been a hot topic in the deep crustal structure studies. The deep seismic (OBS/OBH) and onshore-offshore experiments have been extensively implemented in the northern south china {2. (SCS) since the 1990s. Six seismic profiles were finished on the northern margin of SCS by domestic and international cooperations. The features of crustal structures were revealed and five velocity-inversion layers were discovered. Among them three LVLs with 3.0—3. 5 km·s-1 velocity are located in the sedimentary structure (2.0—6.0 km in depth and 2.0—4. 6 km in thickness) of the Yinggehai Basin and Pearl River Mouth Basin. They were identified by the reflective and refractive phases for their shallow depth. The other two LVLs with 5.5—6.0 km·s-1 velocity generally existed in the middle crust (7.0—18.0 km in depth) with an about 2.5—6.0 km thickness in the transitional crustal structure of the northeastern and northwestern SCS. They were detected by the refractive phase from their overlain and underlying layers. We explored the possible tectonic formation mechanisms combining with previously reported results, which provided evidence for the formation and evolution of SCS.

关键词： low-velocity layer deep crustal structure the northern south china {2. OBS/OBH and onshore-offshore seismic experiments.

Energy distributions of the large-scale horizontal currents caused by wind in the baroclinic ocean

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Earth Sciences 2005年第12期48卷 2267-2275页

作者： ZHOU Lei1, TIAN Jiwei1 & WANG Dongxiao2.1. Physical Oceanography Laboratory, Ocean University of china, Qingdao 2.6003, china 2. Key Laboratory of Tropical Marine Environmental Dynamics, {2., chinese academy of Sciences, guangdong 510301, china 1. Physical Oceanography Laboratory Ocean University of China 266003 Qingdao China 2. Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of Oceanology Chinese Academy of Sciences 510301 Guangdong China

Ocean current data for nearly 3 months in the south china {2. (SCS), combined with the NCEP/NCAR reanalysis wind data, are analyzed. The results indicate that the wind en-ergy enters the upper mixed layer in a wide continuous frequency band. In addition, the interac-tion between the low-frequency wind anomaly and the low-frequency current anomaly is the most ‘effective’ way for the energy input from the wind to the upper ocean. However, only the inertial and the near inertial energy propagate downwards through the upper mixed layer. The down-ward-propagating energy is distributed into the barotropic currents, the baroclinic currents and each mode of the baroclinic currents following the normal distributions. The energy change ratios between the barotropic motion to the baroclinic motion induced by the wind present a normal distribution of N (0.02.2. 0.3947). The energy change ratios of the first 4 baroclinic modes to the whole baroclinic currents also follow the normal distributions. The first baroclinic mode follows N (0.2.2., 0.1872., the second N (0.1979, 0.1504), the third N (0.1331, 0.1633), and the fourth N (0.0650, 0.1540), respectively.

关键词： wind anomaly, ocean current anomaly, energy transportation, wide frequency band, near-inertial fre-quency, energy distribution.

Impacts of Typhoons Tianying and Dawei on seagrass distribution in Xincun Bay,Hainan province,china

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第1期30卷 32-39页

作者： YANG Dingtian HUANG Daojian CAS key Laboratory of Tropical Marine Environmental Dynamics South China Sea Instituteof Oceanology Chinese Academy of Sciences Guangzhou 510301 China south china {2. of Environmental Sciences Ministry of Environmental Protection of thePeople＇s Republic of China Guangzhou 510655 China

More than 50% of the typhoons landing in china have landed on the southeast coast, where they have caused great pressure on the coastal environment. {2.grass, one of the most important con- stituents of coastal ecosystems, is also greatly affected by typhoons. In order to clarify how {2.grass distribution variation is affected by typhoons in coastal areas in southeast china, data of Typhoons Dawei and Tianying （category 4 and category 2.respectively, which just ran through the southern part of Hainan province） have been studied. In situ observation and satellite remote sensing data （CBERS-china Brazil Earth Resources Satellite） in 2.04 and 2.06 were used to retrieve {2.grass distribution in Xincun Bay, Hainan province. In situ observations showed that leaf length, stem biomass and above ground biomass on average showed evidence of reduction after Typhoons Tiany- ing and Dawei. However, {2.grass density showed no evidence of reduction after typhoon Tianying and Dawei passed by and increased rapidly in January 2.06. From results of satellite remote sensing data, {2.grass distribution can be detected with high accuracy, and the area of {2.grass distribution on the south coast of Xincun Bay in 2.06 after the typhoon passed by was smaller than that in 2.04 in region A and B. However, in region C, area of {2.grass coverage under 2.% increased. These results demonstrated that typhoons Tianying and Dawei damaged {2.grass bed and helped {2.grass to get rid of aged and dead leaves, and this correspondingly facilitated {2.grass growth.

关键词： seagrass Typhoon Tianying and Dawei Xincun Bay

Growth performance and physiological parameters of the second generation selected and control groups of Pinctada martensii

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第2期30卷 120-125页

作者： DENG Yuewen YU Ziniu DU Xiaodong WANG Qingheng FU Shao Fisheries College Guangdong Ocean University Zhanjiang 524025 China south china sea institute of oceanology Chinese Academy of Sciences Guangzhou 510301 China

In May of 2.07,the second generation selected （SS） and control （SC） groups of pearl oyster Pinctada martensii were established by selecting 10% breeders with the largest and mean shell length,respectively,from the first generation selected *** performance of the SS and SC groups were compared on the basis of measurement data at Days 8,18,60,95,195 and *** Day 365,100 individuals （60.0–75.0 mm at shell length） were sampled from each group and then subjected to the experiment where physiological parameters such as filtrate rate,oxygen consumption and ammonia excretion were measured at 15,2.,2. and 30°*** results show that the SS group had significantly larger mean shell length and shell height than the SC group at Days 8,18,60,95,195 and 365 （P 0.05）.The genetic gains at different ages varied from 6.0% to 17.0% for shell length and 5.7% to 14.6% for shell height,*** 15,2.,2. and 30 ° C,the SS groups had significantly larger filtrate rate than the SC group （P 0.05）.At 15 and 2. °C,the differences in oxygen consumption rate between the SS and SC groups were not significant （P 0.05）.At 2. and 30 °C,however,the oxygen consumption rate of the SS group was significantly larger than the SC group （P 0.05）.At 15,2.,2. and 30 °C,there were no significant differences in ammonia excretion rate between the SS and SC groups （P 0.05）.The present results indicate that there existed considerable genetic variability in the base population and a further selection could be likely *** selection for faster growth might produce animals that had higher intake of metabolizable energy by virtue of faster filtrating behavior.

关键词： Pinctada martensii the second generation selected group growth genetic gains physiological parameters

Phylogenetic diversity of bacteria associated with the marine sponge Agelas robusta from south china {2.

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2010年第5期29卷 65-73页

作者： SUN We DAI Shikun WANG Guanghua XIE Lianwu JIANG Shumei LI Xiang Key Laboratory of Marine Bio-resources Sustainable Utilization （LMB-CAS） Guangdong Key Laboratory of Marine Materia Mediea （LMMM-GD） South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China Graduate University of the chinese academy of Sciences Beijing 100049 China Central south University of Forestry and Technology Changsha 410004 China

It is well known that marine sponges harbor large numbers of bacteria,some of which have been proved to be *** diversity of bacteria in marine sponges distributed along the coast of south china {2. has been previously studied but that of bacteria in sponges inhabiting the open {2. has been rarely *** this report,the diversity of bacteria associated with the marine sponge Agelas robusta from a remote coral reef in the south china {2. was documented employing 16S rDNA library construction,amplified ribosomal DNA restriction analysis（ARDRA） and phylogenetic analysis.A total of 32.phylotypes were finally categorized in nine phyla including Cyanobacteria,proteobacteria,Chloroflexi,Firmicutes,Actinobacteria,Acidobacteria,Planctomycetes,Bacteroidetes and *** dominant phylum was proteobacteria whereas the dominant genus was Synechococcus in *** spongespecific bacteria were also found in the bacteria population,but the proportion（5 OTUs/32.OTUs） was much lower than other *** study reveals the phylogenetic diversity of bacteria in *** and confirms the presence of some sponge-specific bacteria in the south china *** the diversity of sponge-associated bacteria in china assists to exploit the bacteria resources for biotechnology.

关键词： south china {2. Agelas robusta phylogenetic diversity sponge-specific bacteria

High-frequency atmospheric variability over south china {2. as depicted by TRMM and QuikSCAT

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2011年第2期30卷 46-52页

作者： LI Weibiao WANG Dong xiao LEI Ting LIU Zijie LU0 Cong DepartmentofAtmosphericSciences SunYat—SenUniversityGuangzhou510275China LED SouthChinaSeaInstituteofOceanologyChineseAcademyofSciencesGuangzhou510301China

By using the TRMM and QuikSCAT datathe characteristics of the 2.8 day high frequency atmospheric variability over the south china {2. are studied in this ***’s found that：（1） the 2.8 day high frequency signals are significant not only during the periods of the south china {2. Summer Monsoon （SCSSM）,but also after the retreat of the *** reaches its peak around July to August;（2. the 2.8 day high frequency signals exhibit strong intermittent features;（3） During El Nino years,the 2.8 day high frequency signals are active only in the periods of the *** La Nina years,the 2.8 day high frequency signals are obviously not only in periods of the SCSSM,but also after the retreat of the *** the SCSSM periods,the 2.8 day high frequency signals in El Nino years are much stronger than that in La Nina years;（4） During spring to early summer,most of 2.8 day signals propagate southward and eastward,during midsummer to autumn,however,most of 2.8-day signals propagate northward and westward;（5） The 2.8 day northward and westward propagation signals is probably related to the activities of high-frequency vortex over the SCS.

关键词： high-frequency atmospheric variability south china {2. TRMM QuikSCAT

Total alkyl dibenzothiophenes content tracing the filling pathway of condensate reservoir in the Fushan Depression,south china {2.

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2008年第S2期51卷 138-145页

作者： LI MeiJun1,WANG TieGuan1,LIU Ju2.ZHANG MeiZhu2.LU Hong3,MA QinLin2.& GAO LiHui2.1 State Key Laboratory of Petroleum Resources and prospecting,Earth Sciences and Geoinformatics School,china University of Petroleum,Beijing 102.49,china 2.{2.ern Oil Exploration and Development Company,Petrochina,guangzhou 510640,china 3 guangzhou institute of Geochemistry,chinese academy of Sciences,guangzhou 5102.0,china china Univ Petr Earth Sci & Geoinformat Sch State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China Petrochina So Oil Explorat & Dev Co Guangzhou 510640 Peoples R China chinese Acad Sci Guangzhou Inst Geochem Guangzhou 510240 Guangdong Peoples R China

The condensates are generally characterized by high maturity,low concentration of steranes and ter-panes biomarkers and low content of non-hydrocarbon fraction. In this case commonly used steranes,terpanes and carbazoles parameters cannot be effectively applied in the reservoir-filling tracing. The hydrogen bond formed by sulfur atom in the dibenzothiophenes (DBTs) results in molecule adsorption and fractionation during oil migration in reservoir. Like carbazoles,total DBTs content decreases with the increasing of oil migration distance. Therefore,a new parameter——total DBTs content is proposed to be used to trace the oil migration orientation and filling pathway. In present study,total DBTs con-tents of condensates and light oils are obtained by adding internal standard——eight deuterium atoms substituted DBT during Gas Chromatography-Mass Spectrometry analysis of aromatic fraction. Except for a few samples with much lower content of non-hydrocarbon fraction,the total DBTs content shows a fine positive correlation with that of carbazoles. Large errors can be caused in the process of pyrrolic nitrogen compounds separation. The application of this new parameter in the Fushan Depression of Beibu Gulf Basin,south china {2. indicates that this parameter is a reliable one to trace filling pathway in condensate reservoirs. Combined with other DBTs-related parameters,such as 4-/1-methydibenzo-thiophene and 2.4-/1,4-dimethyldibenzothiophene,oil migration orientation and filling pathway of the Fushan Depression was determined. The accumulations of Huachang oil field in the Fushan Depres-sion are mainly migrated and charged from northeast to southeast along the Huachang uplift. It can be predicated that the light oil and condensates in the Huachang oil field should be sourced from the source kitchen at the Bailian Sag. It shows that total DBTs content is an effective parameter to tracing oil migration orientation and filling pathway.

关键词： dibenzothiophene alkyl dibenzothiophene condensate reservoir filling pathway molecular markers the Fushan Depression

Discovery of Permian island-arc basalts in the Cenxi area and the tectonic significance──A piece of evidence for the paleo-Tethyan tectonic belt in western guangdong and eastern Guangxi

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 1998年第21期43卷 1838-1842页

作者： ZHANG Boyou 1, ZHAO Zhenhua 1, SHI Manquan 1, YANG Shufeng 2.and CHEN Hanlin 2.1. guangzhou institute of Geochemistry, {2. academy of Sciences, guangzhou 510640, china 2. Department of Earth Sciences, Zhejiang University, Hangzhou 31002., china guangzhou institute of Geochemistry Chinese Academy of Sciences Guangzhou China Department of Earth Sciences Zhejiang University Hangzhou China

Cenxi Permian basalts are the late Palaeozoic island-arc type basalts first found in south china. REE and trace element characteristics and distribution patterns show that this volcanic formation, which has been isotopically dated at 2.1 MaB.P. by the 39Ar/ 40Ar method, is of an active continental marginal island arc type, and that the tectonic environment at that time was an island-arc marginal {2. or minor ocean basin related with the paleo-Tethyan tectonic belt in western guangdong-eastern Guangxi.

关键词： spilite-keratophyre pillow lava Permian continental margin paleo-Tethyan evolution.