南黄海海底沉积物声学特性及其影响因素试验研究   总被引：5，自引：2，他引：3  

孟祥梅  刘保华  阚光明  李官保 《海洋学报》2012,34(6):74-83

利用自南黄海中西部海底取回的沉积物样品,对其声学特性及其影响因素进行了试验研究,结果显示,研究区海底沉积物的压缩波速为1.359 ~1.695 km/s,剪切波速为12.5 ~70.9 m/s;颗粒较细的沉积物与较低的压缩波速、剪切波速对应,主要集中在研究区东侧水深较深处;沉积物的物理力学性质对其压缩波速、剪切波速的影响较显著,沉积物的温度和换能器的频率对上述声学两参数也具有一定的影响,而沉积物的包含物及薄夹层等影响声波传播的理论计算结果。给出了研究区海底沉积物物理力学各参数与压缩波速、剪切波速之间的回归方程,以期为国防、工程提供基础资料。  相似文献   

南黄海及长江口附近海域绿潮暴发前期微观繁殖体的动态变化     

方松  王宗灵  李艳  傅明珠  范士亮  王晓  张晓红 《海洋学报(英文版)》2012,31(4):147-154

基于2011年3至5月对南黄海及长江口附近海域的水体与沉积物样品采集及实验室萌发培养实验,分析了绿潮暴发前期该海域微观繁殖体的时空分布特征。结果表明,在调查期间,南黄海水体中微观繁殖体空间分布趋势表现为近岸高远岸低,高值区主要集中在紫菜筏架养殖区附近海域,在122°30'E以东区域未发现有微观繁殖体存在。3,4,5月份该区域海水中平均微观繁殖体数分别为144 ,164和140株/dm³,最大值分别为278,426,和537株/dm³;南黄海沉积物中微观繁殖体数量分布范围介于19~127株/层,表层微观繁殖体数高于底层。长江口以北靠近江苏近岸区域有微观繁殖体存在,数量介于1~10株/dm³,31°N以南区域和河口内未发现有繁殖体分布,由此可排除黄海浒苔等绿藻微观繁殖体由长江水携带入海或来源于长江口南部海域。在春季绿潮暴发前开展该海域微观繁殖体的研究,可为查明绿潮发源地及早期发生发展过程提供基础资料,为预测和预警绿潮发生提供科技支撑。  相似文献   

Changes of nutrient concentrations and N: P: Si ratios and their possible impacts on the Huanghai Sea ecosystem   总被引：4，自引：1，他引：3  

FU Mingzhu  WANG Zongling  PU Xinming  XU Zongjun  ZHU Mingyuan 《海洋学报(英文版)》2012,31(4):101-112

To investigate the impacts of nutrient concentrations and N:P:Si ratios on the ecosystem of the Huanghai Sea (Yellow Sea), the current status and long-term variation of nutrients concentrations and ratios as well as phytoplankton community structure in the Huanghai Sea were collected and analyzed. The results reveal great annual and seasonal fluctuations in the nutrient concentrations and N:P:Si ratios during 1998-2008 with no clear pattern observed in the whole region. Yet on a seasonal scale of spring and in the coastal regions such as the Jiaozhou Bay and Sanggou Bay, the increase of DIN concentration and N:P ratio as well as the decrease of phosphate and silicate concentrations and Si:N ratios were relatively significant. Many pelagic ecosystem changes have occurred concurrent with these changes of the nutrient regime, such as the recent increase of primary production, changes of phytoplankton chlorophyll a biomass and abundance, an increase of eutrophication, and occurrence of HABs. In addition, new trends in the variation of nutrients seem to be developing in some particular transect such as 36°N, which suggests that long-term and systematic ecosystem monitoring in the Huanghai Sea is necessary.  相似文献   

Seasonal variability of the zooplankton community in the southwest of the Huanghai Sea (Yellow Sea) Cold Water Mass   总被引：2，自引：0，他引：2  

LIU Ping  SONG Hongjun  WANG Xiao  WANG Zongling  PU Xinming  ZHU Mingyuan 《海洋学报(英文版)》2012,31(4):127-139

Samples were collected with a plankton net in the four seasonal cruises during 2006-2007 to study the seasonal variability of the zooplankton community in the southwest part of Huanghai Sea Cold Water Mass (HSCWM, Yellow Sea Cold Water Mass). The spatial and temporal variations of zooplankton species composition, biomass, abundance and biodiversity were examined. A total of 122 zooplankton species and 30 pelagic larvae were identified in the four cruises. Calanus sinicus and Aidanosagitta crassa were the most dominant species, and Themisto gaudichaudi and Euphausia pacifica were widely distributed in the HSCWM area. The spatial patterns of non-gelatinous zooplankton (removing the high water content groups) were similar to those of the total zooplankton biomass in autumn, but different significantly in the other three seasons. The seasonal means of zooplankton biomass in spring and summer were much higher than that in autumn and winter. The total zooplankton abundance averaged 283.5 ind./m~3 in spring (highest), 192.5 ind./m~3 in summer, 165.5 ind./m~3 in autumn and 65.9 ind./m~3 in winter (lowest), and the non-gelatinous groups contributed the most total abundance. Correlation analysis suggests that the non-gelatinous zooplankton biomass and abundance had a significant positive correlation in the whole year, but the relationship was insignificant between the total zooplankton biomass and abundance in spring and summer. The diversity index H of zooplankton community averaged 1.88 in this study, which was somewhat higher than historical results. Relatively low diversity in summer was related to the high dominance of Calanus sinicus, probably due to the strongest effect of the HSCWM in this season.  相似文献   

南黄海中部海底沉积物原位声速与物理性质相关关系   总被引：2，自引：1，他引：1  

阚光明  苏元峰  李官保  刘保华  孟祥梅 《海洋学报》2013,35(3):166-171

基于在南黄海中部获得的海底沉积物原位声速数据,分析讨论了原位声速与密度、含水量、孔隙比、孔隙度等沉积物物理性质参数的相关关系。通过回归分析建立了海底沉积物原位声速预测方程。结果表明,原位声速与上述物理参数之间具有良好的相关性,相关系数r均大于0.93。对比分析了原位声速预测方程与甲板声速预测方程的差异,两者最小相差15.8 m/s,最大相差31.3 m/s,平均差值约为22.6 m/s。将原位声速预测方程与其他研究者建立的声速预测方程进行了对比,结果表明不同声速预测方程存在明显差异,初步分析了存在差异的原因。  相似文献   

渤海、黄海、东海M₂潮汐潮流的三维数值模拟   总被引：23，自引：2，他引：21  

王凯  方国洪  冯士筰 《海洋学报》1999,21(4):1-13

利用建立的一种新的半隐半显三维数值格式,将渤海、黄海、东海作为一个整体,采用球面坐标系下的三维潮波方程组,考虑了引潮力的作用,数值模拟了渤海、黄海、东海的M₂分潮的潮汐与潮流,结果较好地体现了渤海、黄海、东海M₂分潮的特征.通过比较65个验潮站的实测值与计算值,所得计算结果的振幅差平均为6.4cm,相角差为6.1°,计算与实测符合良好.本文给出的问潮图与Fang于1986年给出的实测占数值综合结果基本一致.对选取的47个测流站,比较了各层潮流调和常数Ucosζ、Usinζ、Vcosη、Vsinη的计算值与实测值的偏差,偏差绝对值的平均在2.6～4.9cm/s之间.并比较分析了潮流的垂直结构,所得结果与实测符合较好.首次揭示出回流点的水平位置不随深度变化这一特性.最后给出了M₂分潮的潮能消耗.  相似文献   

Study on the feeding habit and trophic level of main economic invertebrates in the Huanghai Sea     

Cheng Jisheng  Zhu Jinsheng  Jiang Weimin 《海洋学报(英文版)》1999,18(1):117-126

INTRODUCTIONTheHuanghaiSeaisrichwithfisheryspecies.Apartfromfishes,thereisagreatnumberofinvertebrates,ofwhichmanyareofcommercialimportance,playinganimportantroleintheHuanghaiSeafishery.Twogroupsofinvertebrates,CrustaceaandCephalopodawerelandedduringthetrawlsurveysintheHuanghaiSea.CrustaceaincludedPenaeusorientalis,Trachypenaeuscurvirostris,Crangonaffinis,Mitatynaeopsisdalei,Palaemongravieri,Portunustrituberculatus,Charybdisbimaculata,Oratosquillaoratoria,etc.andCephalopodainclucded…  相似文献   

青岛-石岛近海反气旋中尺度涡旋存在证据及数值模拟   总被引：3，自引：1，他引：2  

徐丹亚  赵保仁 《海洋学报》1999,21(2):18-26

系统整理的历史实测海流和温盐资料显示出青岛-石岛近海水域全年都存在着中尺度反气旋式涡旋运动.利用二维数值模式,首次模拟出该涡旋的存在,并对这一涡旋的形成机制进行了探讨,数值模拟结果和实测吻合良好.数值计算表明:在冬季盛行风的作用下,山东半岛南岸出现减水,迫使北上的黄海暖流中的一部分向西北方向延伸,在到达山东半岛近海后向右转向,形成东北向沿岸流,这样,与绕过山东半岛大约沿40～50m等深线南下的黄海沿岸流作用,在青岛-石岛近海形成一个中尺度反气旋涡旋.夏季由于偏南风的作用,致使山东半岛南部近海浅水区域海水都向东北方向流动,与沿黄海冷水团锋面南下的黄海沿岸流相作用,由于流速切变也形成了上述涡旋.  相似文献   

苏北南黄海潮成沙体的发育条件及演变过程   总被引：8，自引：1，他引：7  

张家强  李从先  丛友滋 《海洋学报》1999,21(2):65-74

典型钻孔的层序地层、沉积磁组构、碎屑矿物等的分析资料以及古河谷的地质雷达探测资料等的综合研究表明,苏北南黄海潮成沙体是全新世海退以来形成的,辐聚辐散的潮流和长江、黄河的供沙是其主要发育条件.辐聚辐散的潮流场是南黄海固有的,至少在苏北亚近代潮成沙体发育之初就已存在.大河供沙主要发生在全新世海退期,海退前长江不可能向苏北岸外海域大量供沙,更不可能在港岸外形成三角洲.潮成沙体的演变主要受长江、黄河的供沙率控制,大致经历了雏形发育、高速建设、动态调整等3个阶段.  相似文献   

On the Huanghai (Yellow) Sea circulation: a review by current measurements   总被引：6，自引：1，他引：5  

Heung-Jae Lie 《海洋学报(英文版)》1999,18(3):355-373

INTRODUCTIONTheHuanghaiSea(hereafterHS)isashallow,semi-enclosedbasinsurroundedbytheChina'sMainlandtoitswestandmorth,andbytheKoreaPeninsulatOtheeast.TheHSreceivesabundantdischargeoffreshwaterandland-basedmaterialsthroughriversfromChinaandKorea,which ThisstudywassupportedbyagrantfromtheKoreaMinistryofaudienceandTechnoing.maybeaccumulatedpartlyinsidethebasinforacertainpenedormoveoutofthebasinintothenorthwesternEastChinaSea.TheHScirculationisknowntobemostlydependentuPOnsurfacewindfie…  相似文献