东海1999年夏、冬上层水团的温、盐分布及其与历史平均状况的比较   总被引：2，自引：0，他引：2  

吕华庆 《海洋学研究》2006,24(1):28-36

通过综合分析有关文献资料,提出了东海表层各个水团的温、盐指标并把它们分成3个水系(沿岸水系、混合水系和黑潮水系)。把1999年7月和2000年2月的观测结果与历史(1907~1986年的7月和2月)平均值比较后发现:1999年7月,东海表层水团及台湾暖流北上势力弱于历史平均状况,但它们朝东北方向推进;长江冲淡水的外侧部分在济州岛西南具有朝东南方向伸展的特征。2000年2月,黑潮入侵势力强于历史平均状况;黄海水团入侵东海的势力不大;与10~14℃等温线组成的浙江沿岸温度锋相对应,盐度锋不明显。根据东海各水团的温、盐判别数据,将实测资料和历史平均值资料进行对比,可判别各水团的分布和变化特征。  相似文献   

东、黄海典型海区分粒级浮游植物叶绿素a的周日波动及影响因子   总被引：3，自引：0，他引：3  

林丽贞  陈纪新  刘媛  曹振锐  黄邦钦 《台湾海峡》2007,26(3):342-350

本文分析了东、黄海典型海区3个测站在2000~2003年间4个航次的叶绿素a周日变动特征,结果表明由于地理环境、水文特征以及季节差异,各海区叶绿素a表现出各自不同的变动特点.在东海陆架区,日变化上表层各粒级主要以半日周期为主,受黑潮入侵程度不同而略有变化;长江口由于受到潮汐的影响,各粒级的日变化同潮汐的涨落相对应,主要为半日周期;黄海中部海区叶绿素a尤其是NANO级浮游植物在周日变化上以全日周期为主,受黄海冷水团强弱不同而不同.本文进一步应用渐近回归初步分析了多种环境因子对叶绿素a周日变化的影响.  相似文献   

Native aluminium (spherules and particles) in the Central Indian Basin sediments: Implications on the occurrence of hydrothermal events     

Sridhar D. Iyer  M.B.L. Mascarenhas-Pereira  B. Nagender Nath 《Marine Geology》2007,240(1-4):177-184

We have sampled particles of native aluminium (Al°) in two sediment cores from the Central Indian Basin (CIB). The cores are geographically separated but are located at the base of two seamounts. The native Al° particles occurring as grains and spherules, have an average Al content of  95% and are associated with volcanogenic–hydrothermal material. Morphologically and compositionally, the specimens are similar to those reported from the East Pacific Rise. After ruling out several processes for the presence of the native Al°, we hypothesize that during progressive melting of magma, a basaltic magma is produced which has high contents of reductants such as methane and hydrogen, and a low oxygen fugacity. During the upward migration of such magma, reduction to metallic aluminium and the formation of native Al° particles takes place.  相似文献   

人工神经网络方法反演东中国海悬移质浓度     

李伟 《海洋湖沼通报》2007,(4):55-58

海中悬移质是决定海洋光学性质、海洋水质,河口海岸带演变动力过程的重要环境参数。本文利用模拟遥感反射比数据集建立人工神经网络反演悬移质浓度,并利用东中国海现场同步数据对该算法进行验证。  相似文献   

冬季东中国海环流中的中尺度涡旋数值模拟   总被引：5，自引：0，他引：5       下载免费PDF全文

陈敏  侯一筠  赵保仁 《海洋科学》2003,27(1):53-60

采用高精度的POM模式 ,考虑了海底地形、外来流、长江径流、海面风应力、海面热通量等多方面因素的影响 ,模拟了冬季东中国海环流结构。模拟结果显示 :在黄海东部很可能存在两个涡 ,中心分别在124°37′E ,37°N ,124°E ,35°30′N ;东海北部存在一个大型的气旋式涡旋 ,其中心位置在125.1°E ,30.5°N附近 ,该涡旋是由东北向的台湾暖流、西北向的黄海暖流及南下的沿岸流组成的封闭结构 ;日本九州以西黑潮入侵分支形成一涡旋 ,黑潮分支是形成此涡旋的直接动力因素 ,另外地形和冬季盛行的偏北风也对该涡旋的形成有一定正面影响。  相似文献   

Multiple stock structure of Atlantic cod (Gadus morhua) off Newfoundland and Labrador determined from genetic variation   总被引：1，自引：0，他引：1  

Beacham  Terry D.; Brattey  John; Miller  Kristina M.; Le  Khai D.; Withler  Ruth E. 《ICES Journal of Marine Science》2002,59(4):650-665

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东、黄海海表面温度季节内变化特征的EOF分析   总被引：7，自引：0，他引：7  

曾广恩  练树民  程旭华  华祖林  齐义泉 《海洋科学进展》2006,24(2):146-155

基于1998—2004年的TRMM/TMI卫星遥感海面温度(SST)数据,在初步分析东、黄海SST的季节分布特征的基础上,采用EOF方法分析了SST的季节内变化特征,进而对SST季节内变化的可能机制进行了探讨。EOF分析获得的前4个模态的累积方差贡献率为57.07%,其结果基本反映了东、黄海SST变化的主要物理过程。其中,EOF的第一模态的方差贡献率占30.17%,其空间模态揭示了以东海北部为中心的、整个海域SST变化趋于一致的特征,这一模态的显著变化周期为6.3周;第二模态的方差贡献率占14.36%,其空间模态呈现东南海域与西北海域SST的反相变化趋势,显著变化周期为8.7周和10.6周;第三模态的方差贡献率占7.02%,其空间SST变率最大的区域位于黄海海域,显著变化周期为6.8,8.7,10.2周等;第四模态的方差贡献率占5.52%,其空间SST变率最大的区域位于东、黄海近海,显著变化周期为6.8周。东、黄海SST季节内变化与此海区大气中的季节内振荡是紧密相关的。  相似文献   

REE distribution in water-sediment interface system at deep ocean floor     

Zhang Lijie  Liu Jihu  Yao De 《海洋学报(英文版)》1994,13(4):519-526

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Summer distribution and geochemical composition of suspended-particulate matter in the east china sea     

Jia-Jang Hung  Chia-Lin Chan  Gong-Ching Gong 《Journal of Oceanography》2007,63(2):189-202

The distribution and geochemical composition of suspended-particulate matter (SPM) in the East China Sea (ECS) were investigated during the summer period of high continental runoff to elucidate SPM sources, distribution and cross-shelf transport. The spatial variability of SPM distribution (0.3–6.5 mg l⁻¹) and geochemical composition (POC, Al, Si, Fe, Mn, Ca, Mg and K) in the ECS was pronounced during summer when the continental fluxes of freshwater and terrestrial materials were highest during the year. Under the influences of Changjiang runoff, Kuroshio intrusion, surface production and bottom resuspension, the distribution generally showed strong gradients decreasing seaward for both biogenic and lithogenic materials. Particulate organic carbon was enriched in surface water (mean ∼18%) due to the influence of biological productivity, and was diluted by resuspended and/or laterally-transported materials in bottom water (mean 9.4%). The abundance of lithogenic elements (Al, Si, Fe, Mn) increased toward the bottom, and the distribution correlations were highly significant. Particulate CaCO₃ distribution provided evidence that the SPM of the bottom water in the northern part of the study area was likely mixed with sediments originally derived from Huanghe. A distinct benthic nepheloid layer (BNL) was present in all seaward transects of the ECS shelf. Sediment resuspension may be caused by tidal fluctuation and other forcing and be regarded as the principal agent in the formation of BNL. This BNL was likely responsible for the transport of biogenic and lithogenic particles across or along the ECS shelf. Total inventories of SPM, POC and PN are 46, 2.8 and 0.4 Tg, respectively, measured over the total area of 0.45 × 10⁶ km² of the ECS shelf. Their mean residence times are about 27, 13 and 11 days, respectively. The inventory of SPM in the water column was higher in the northernmost and southernmost transects and lower in the middle transects, reflecting the influences of terrestrial inputs from Changjiang and/or resuspended materials from Huanghe deposits in the north and perhaps from Minjiang and/or Taiwan’s rivers in the south. The distribution and transport patterns of SPM and geochemical elements strongly indicate that continental sources and cross-shelf transport modulate ECS particulate matter in summer.  相似文献   

Interannual to diurnal variability in the near-surface scattering layer in Drake Passage     

Chereskin  T. K.; Tarling  G. A. 《ICES Journal of Marine Science》2007,64(9):1617-1626

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