北太平洋海表面高度(SSH) 与风应力变化的关系     

黄琳  孙佳  杨逸秋  袁逸凡 《海洋与湖沼》2013,44(1):111-119

利用1958-2008年的北太平洋海表面高度和风应力资料,并与ENSO和PDO指数进行相关分析.结果发现,风应力及其经向分量主要通过季节振动影响海表面高度(SSH)的年周期变化,纬向风应力主要通过多年振动影响SSH的ENSO和PDO周期.纬向风应力和SSH均以黑潮延伸体主轴为界,两侧呈现出相反的升降趋势,SSH为北降南升,纬向风应力南降北升.风应力和SSH升降趋势相同,均表现为“上升—下降—上升”的变化特征.在地形变化剧烈、等深线南北分布的海区,西风增强会导致SSH升高,且西侧升高较为明显.北风增强将导致北太平洋西岸SSH升高,东岸SSH降低.  相似文献   

琼东南盆地南部中新统“丘”形反射成因探讨   总被引：4，自引：3，他引：1  

赵天亮  蒲仁海  屈红军  张功成  梁建设  冯杨伟 《海洋学报》2013,35(4):112-120

在琼东南盆地南部中新统梅山组广泛发育“丘”形反射, 对其识别分析具有重要的意义。这些“丘”形反射主要分布在北礁凹陷及周缘斜坡带上, 在顶底界面呈强反射, 在内部成层、杂乱或为空白反射, 有时在顶部见披覆沉积, 从盆地中心北礁凹陷向边缘斜坡带迁移生长。通过对“丘”形反射的古构造和古地理背景、几何学特征及地震响应特征等方面综合分析, 对其成因进行了探讨, 排除了其为生物礁、泥底辟以及火山丘的可能, 认为其可能为深水环境底流作用下形成的等深流沉积或某种沉积物波。  相似文献   

Macrobenthic polychaete assemblages of the continental shelf and upper slope off the west coast of the South Island,New Zealand     

P. K. Probert  G. B. Read  S. L. Grove  A. A. Rowden 《新西兰海洋与淡水研究杂志》2013,47(5):971-984

Polychaete assemblages are described from replicate box‐core samples collected in summer 1983 at 18 stations on the continental shelf and upper slope (28–943 m) off the west coast of the South Island, New Zealand, south‐eastern Tasman Sea (c. 41–43°S, 169–172°E). Three main station groupings were identified by multivariate analysis: (1) inner shelf sandy stations characterised by Prionospio australiensis, Aricidea (Acesta) sp., Magelona cf. dakini, Paraprionospio aff. pinnata, Aglaophamus sp., Heteromastus filiformis, and Magelona sp.; (2) middle to outer shelf muddy stations characterised by Levinsenia cf. gracilis, Prionospio australiensis, Paraprionospio coora, Aglaophamus verrilli, and Auchenoplax mesos; and (3) upper slope sandy mud or mud stations characterised by Prionospio ehlersi. A combination of water depth and sediment clay content provided the best correlation with the biotic pattern. Spionidae was the most abundant family (49% of polychaete individuals), which may reflect the scope for opportunistic species in a shelf environment characterised by a high input of terrigenous sediment and episodic upwelling.  相似文献   

冬季南黄海浮游动物群落结构及其对黄海暖流的指示   总被引：2，自引：1，他引：1  

王亮  李超伦  于非 《海洋与湖沼》2013,44(4):853-859

2009年12月和2010年1月对南黄海进行浮游动物采集, 以了解冬季浮游动物群落结构及其对黄海暖流的指示作用。结果表明, 南黄海冬季仍然以温带和暖温带种为主, 中华哲水蚤Calanus sinicus、强壮滨箭虫Aidanosagitta crassa、细足法Themisto gracilipes等温带和暖温带种类在浮游动物数量组成中具有较大优势。与此同时, 一些暖水种在调查海域局部出现。2009年12月暖水种仅分布在南黄海东南部黄海暖流源地附近。位于黄海中部的调查区东侧温盐层化现象明显, 近底层低温、高盐、高营养盐的水文特征体现了黄海冷水团的残留; 2010年1月在35°—36°N区域暖水种种类明显增加, 截平头水蚤Paracandacia truncata、长尾基齿哲水蚤Clausocalanus furcatus出现的位置与暖流路径相吻合, 海洋真刺水蚤Euchaeta rimana数量相比12月有明显向北推进的趋势。主成分分析显示暖水种的分布与温度有良好的相关性。Shannon-Weaver指数、丰富度指数、均匀度指数等没有呈现明显的分布规律, 对黄海暖流的指示作用不如种类明显。  相似文献   

末次盛冰期末期以来南海北部陆坡的陆源物质输入及其控制因素     

黄杰  李安春  万世明  徐方建  孟庆勇 《海洋与湖沼》2013,44(4):882-889

通过对南海北部陆坡KNG5孔沉积物粒度、粘土矿物和14C年龄的综合分析, 探讨了南海北部陆坡的沉积物来源及其控制因素。物源分析表明, KNG5孔17.5-12.5ka BP的沉积物主要来源于珠江, 12.5ka BP 时粘土矿物组合突然发生改变, 并且自12.5ka BP以后, 高岭石含量总体稳定, 说明12.5ka BP时海平面已上升到相当的高度, 并且可能当时南海的现代环流系统已开始形成, 西行的广东沿岸流导致向外扩散的珠江物质减少, 由于受北太平洋深层水(NPDW)和黑潮(KC)南海分支的作用, 台湾成为此时沉积物的主要贡献者。KNG5孔17.5-11ka BP时期的粘土矿物和粒度变化主要受控于海平面和洋流系统的变化。全新世早期(11.0-8ka BP)平均粒径达到最细和1-2.2m 粒级含量达到最高值可能是强盛的夏季风作用的结果。全新世中晚期(8—0ka BP) 1-2.2?m组分含量的减少是8ka BP以来东亚夏季风减弱的具体体现, 1-2.2m 粒级含量指示的东亚夏季风变化能和北半球其它季风指标能很好地对应起来, 说明这次季风减弱是北半球各个季风系统的共同现象。  相似文献   

The influence of thermohaline fronts on chlorophyll a concentrations during spring and summer in the southeastern Yellow Sea     

JANG Pung-Guk  LEE Tong Sup  KANG Jung-Hoon  SHIN Kyoungsoon 《海洋学报(英文版)》2013,32(9):82-90

A spatial and temporal variation in physiochemical parameters in the southeastern Yellow Sea(YS) is investigated in the spring and summer of 2009 to 2011.Nutrient show a strong negative relationship with chlorophyll a(Chl a) concentration in spring,and the subsurface chlorophyll a maxima(SCM) layer was associated with the nitracline in summer.In summer,the SCM was usually found within or above the pycnocline and at the depths of shoals from the open sea to the coastal sea due to tidal and/or topographical fronts in the southernmost study area.High Chl a concentrations were found in the central southern YS,where the YS cold water layer expanded under the pycnocline and encountered water masses during spring and summer.After a typhoon in the summer of 2011,Chl a concentration increased,especially in the central southern YS,where cold waters occurred below the pycnocline.The results suggest that the development of thermohaline fronts may play an important role in the growth and accumulation of phytoplankton biomass in the upper layer of the southeastern YS during spring and summer.  相似文献   

Distribution of dinoflagellate cysts in Yellow Sea sediments   总被引：1，自引：1，他引：0  

SHIN Hyeon Ho  LIM Dhongil  PARK Soung-Yun  HEO Seung  KIM So-Young 《海洋学报(英文版)》2013,32(9):91-98

To investigate the distribution,abundance,and species composition of dinoflagellate cysts in the Yellow Sea,surface sediment samples were collected at 37 sites,including the Korean dump site.Twenty-one dinoflagellate cyst taxa were identified,with the assemblages dominated mainly by Spiniferites bulloideus,Operculodinium centrocarpum,and cyst of Alexandrium catenella/tamarense type.A high frequency of O.centrocarpum in the Yellow Sea was observed for the first time,and it is likely that this can be attributed to the dynamics of the Yellow Sea Cold Water Mass and the Changjiang(Yangtze) River runoff.Total cyst concentrations ranged from 23 to 48 442 cysts/g dry weight,and high cyst concentrations were recorded adjacent to the dumping site.This result suggests that anthropogenic activities such as ocean dumping stimulate the growth of dinoflagellates in the Yellow Sea,which in turn leads to high levels of dinoflagellate cyst production.  相似文献   

我国北方区域沙尘天气的时间特征分析   总被引：3，自引：0，他引：3  

吴占华  任国玉 《气象科技》2007,35(1):96-100

将我国北方沙尘主要影响区划分为3个区（西北区、华北区、东北区）,用网格面积加权计算区域平均的方法,比较了各区沙尘天气的时间演化特征。结果表明：西北部沙尘日数的量级明显多于东北部;沙尘暴的发生有比较明显的日变化特征,各区白天较夜间更易发生沙尘暴,2区（华北区）和3区（东北区）发生沙尘暴初始时刻的峰值出现在14：00,1区（西北区）出现在15：00～16：00;2区和3区出现沙尘天气的极值在4月,而1区在4、5两个月都是极值期;春季是各区沙尘天气的多发期,1区夏季沙尘天气发生的频次也较高;各区的沙尘日数均在20世纪80年代中期前后发生了由多到少的跃变,1区和2区的突变点在1987年,3区在1983年。我国北方3个区沙尘天气的日、月、季节变化有明显的区域特征,其中1区表现得较为独特,2区和3区则比较接近。  相似文献   

陕北植被变化遥感监测及对径流的影响   总被引：5，自引：0，他引：5  

孙智辉  罗琳  苏锋  李新亚 《气象科技》2007,35(2):282-285

陕北北部是我国水土流失最为严重的地区,年输入黄河的泥沙量占全河的38%。1999年实施退耕还林草工程后,退耕还林草面积达9617.2 km2。利用1998-2004年NOAA卫星遥感资料,计算陕北北部地区归一化植被指数,发现陕北植被指数增幅在50%-200%之间,其中吴旗县增幅最大。对延安北部及榆林市1998-2004年降水量资料分析,得出植被指数增加是退耕还林草工程初见成效,不是由于降水变化引起的。利用1980-2004年吴旗县气象站观测的降水量和水文站所测径流量进行时间序列相关分析、典型年对比分析,得出该县植被变化对年径流量产生了影响,年径流量和泥沙量减少近一半,对保持水土有积极意义。  相似文献   

Survey of estrogenic and androgenic disruption in Swedish coastal waters by the analysis of bile fluid from perch and biomarkers in the three-spined stickleback   总被引：1，自引：0，他引：1  

Pettersson M  Hahlbeck E  Katsiadaki I  Asplund L  Bengtsson BE 《Marine pollution bulletin》2007,54(12):1868-1880

The potential for endocrine disruption close to sewage treatment plant and pulp mill effluent discharge points along the Swedish Baltic Sea coast was explored using a dual survey strategy employing two stationary fish species. The levels of vitellogenin and spiggin as biomarkers of endocrine disruption were determined in juvenile three-spined sticklebacks (Gasterosteus aculeatus L.) together with the sex ratios and the presence of intersex. As an indication of exposure, estrogenic and androgenic substances were analysed by GC–MS in bile from perch (Perca fluviatilis L.). Spiggin and vitellogenin levels in juvenile three-spined sticklebacks were generally low, and, for most sampling sites no deviation in gonad type ratios were observed. No remarkable levels of natural or synthetic estrogens or androgens were observed in bile fluid from perch, while bisphenol A and 4-nonylphenol were detected in perch from both reference sites and exposed sites. Taken together, the results did not indicate estrogenic or androgenic disruption in the investigated waters.  相似文献