共查询到20条相似文献，搜索用时 15 毫秒
1.
Monsoon-driven succession of the larval fish assemblage in the East China Sea shelf waters off northern Taiwan 总被引：2，自引：0，他引：2
Hung-Yen Hsieh Wen-Tseng Lo Long-Jing Wu Dong-Chung Liu Wei-Cheng Su 《Journal of Oceanography》2011,67(2):159-172
The seasonal variation in the larval fish community related to the hydrography in the East China Sea (ECS) off northern Taiwan
was studied from February to November 2004. Hydrographic conditions in the southern ECS are strongly influenced by the different
water masses due to the seasonal monsoon system. A total of 173 taxa of larval fish belonging to 68 families and 105 genera
were identified during the study period. The highest abundance of larval fish was recorded in winter, a moderate abundance
was seen in late spring and summer, and the lowest abundance in autumn. Significantly higher abundances were usually found
in the mixing zone than in ECS and the Kuroshio Current, and the number of species of larval fish was greater during the warm
period than during the cold period. The larval fish fauna in the southern ECS is a mixture of endemic and exotic species;
the latter come from the coastal waters of mainland China when the northeasterly monsoon prevails, from the South China Sea
during the southwesterly monsoon, and from the Kuroshio waters year-round. The succession of water masses induced by the monsoon
systems and the high nutrient levels caused by frontal turbulence and topographic upwelling may determine the distributions
of larval fish in terms of abundance and composition. 相似文献
2.
舟山渔场及其邻近海域水团的季节特征 总被引：5，自引：0，他引：5
根据2001年夏季和2002年冬季两次现场调查所收集的CTD和营养盐资料,利用模糊聚类分析法,对舟山渔场及其邻近海域水团的季节特征进行了分析.结果表明,舟山渔场及其邻近海域水团的配置、分布范围、温盐特性和营养盐含量都有明显的季节特征.其中,冬季在全海域共有3个水团(江浙沿岸水、台湾暖流表层水和黄海混合水),而夏季则存在4个水团(江浙沿岸水、台湾暖流表层水、台湾暖流深层水和黄海混合水);冬季,江浙沿岸水的分布范围较小,温度偏低,盐度略高,营养盐偏高,而夏季,其分布范围较大,温度偏高,盐度偏低,营养盐偏低;冬季,台湾暖流表层水北伸最强,厚度最厚,温度最低,盐度最高,硅酸盐和硝酸盐偏高,而夏季,则北伸最弱,厚度最薄,温度最高,盐度最低,硅酸盐和硝酸盐偏低;台湾暖流深层水是一个季节性水团,它含有较丰富的营养盐;黄海混合水的分布范围和营养盐含量也都呈现出明显的季节特征. 相似文献
3.
《African Journal of Marine Science》2013,35(1):453-461
Daily catches of Loligo vulgaris and the fishing effort of commercial beach-seiners operating along the coasts of the Thracian Sea were recorded between October 1994 and May 1995. Taking into account the spatial distribution of the ports, the squid fishing grounds and the daily activity of the beach-seiners, five coastal zones were determined for the monitoring of fishery data. Multivariate analysis failed to show significant differences between the monthly catch rate (cpue) in the zones. However, Loligo vulgaris cpue was clearly seasonal, with a distinct peak in November and an evident decline from winter to spring. Temperature, rainfall and local wind records were used in making a preliminary investigation into meteorological factors that may affect beach-seine catches of squid. Multiple linear regression analysis revealed that temperature is a highly significant explanatory variable for cpue variation, whereas the intensity of the wind plays an important role, but mostly during winter. Rainfall was significantly related to variation in cpue in one zone. Cpue was generally negatively correlated with air temperature and rainfall. Most significant correlations of cpue with wind were also negative. 相似文献
4.
北黄海冷水团温度年际变化研究 总被引：6，自引：2，他引：4
本文基于1976—2006年国家标准断面(大连—成山头)调查资料,结合ECMWF气温、风速以及辐射等再分析资料,研究了北黄海冷水团的低温中心以及北部锋面的年际变化规律,并对其与气候年际变化信号的关系做了相关性分析以及EOF分析,研究了影响北黄海冷水团的诸多因素。研究结果表明,北黄海冷水团及其北部锋面强度存在明显的年际变化特征,北黄海冷水团中心最低温度具有升温趋势,北部锋面强度具有减弱趋势。分析发现,前冬海温,当地气温,经向风场以及辐射通量都对来年北黄海冷水团的强度存在影响,东亚冬季风的年际变异是影响北黄海冷水团温度年际变化的主要机制,El Nio、La Nia事件成熟期滞后于北黄海冷水团最低温度的相对低值、高值出现,ENSO通过与东亚冬季风的相互作用与北黄海冷水团相联系。 相似文献
5.
Impact of atmospheric and physical forcings on biogeochemical cycling of dissolved oxygen and nutrients in the coastal Bay of Bengal 总被引：1，自引：0，他引：1
V. V. S. S. Sarma B. Sridevi K. Maneesha T. Sridevi S. A. Naidu V. R. Prasad V. Venkataramana T. Acharya M. D. Bharati Ch. V. Subbaiah B. S. Kiran N. P. C. Reddy V. V. Sarma Y. Sadhuram T. V. R. Murty 《Journal of Oceanography》2013,69(2):229-243
Time-series observations were conducted off Visakhapatnam, central west coast of Bay of Bengal, from October 2007 to April 2009 to examine the influence of physical and atmospheric processes on water column nutrients biogeochemistry. The thermal structure displayed inversions of 0.5 to 1.0° C during winter and were weaker in summer. The water column was vertically stratified during the entire study period and was stronger during October–November 2007 and August–December 2008 compared to other study periods. High concentrations of chlorophyll-a and nutrients were associated with the extreme atmospheric events. The strong relationship of nutrients with salinity indicates that physical processes, such as circulation, mixing and river discharge, have a significant control on phytoplankton blooms in the coastal Bay of Bengal. Phosphate seems to be a controlling nutrient during winter whereas availability of light and suspended matter limits production in summer. Formation of low oxygen conditions were observed in the bottom waters due to enhanced primary production by extreme atmospheric events; however, re-oxygenation of bottom waters through sinking of oxygen-rich surface waters by a warm core (anticyclonic) eddy led to its near recovery. This study reveals that atmospheric and physical processes have significant impacts on the water column biogeochemistry in the coastal Bay of Bengal. 相似文献
6.
Response of the low-frequency fluctuations of sea level to atmospheric forcing along the coasts of the Huanghai Sea and the East China Sea 总被引：1，自引：0，他引：1
In this paper, the low-frequency fluctuations of sea level and their relationship to atmospheric forcing along the coasts of the Huanghai Sea and the East China Sea are studied. Spectrum analyses are made for the time series of daily mean sea level, atmospheric pressure and wind stress at seven coastal stations. It is found that at all the stations, the main part of the energy of the sea level fluctuations, within the (2-60)-day period, is concentrated on the (12-60)-day period band and that an obvious spectral peak appears at the 3-day period. Along the coast of the Huanghai Sea, variations in the sea level are greater in winter than in summer. In winter, along the coasts of the Huanghai Sea and the East China Sea there is a kind of sea level fluctuations propagating southwards. Among the many factors causing sea level variation, the most obvious one is atmospheric pressure, followed next by the alongshore wind stress. 相似文献
7.
苏北沿岸水的去向与淡水来源估算 总被引：1，自引：0，他引：1
本文基于2006—2007年春、夏、秋、冬季CTD观测的盐度资料分析了苏北沿岸水盐度的季节变化特征,并利用冬、夏季盐度场变化估算了苏北沿岸水的淡水来源。结果表明:冬季苏北沿岸水在东北季风的驱动下顺岸南下,在离开苏北浅滩后转向东南进入东海;夏季低盐的苏北沿岸水分多支向北、向东流出沿岸区,后者汇入南黄海夏季冷水团环流中。估算结果表明苏北沿岸水的淡水来源主要是苏北沿岸的入海径流水,约占总量的65%,次之是降水/蒸发量通量和长江冲淡水沿江苏沿岸的北向扩展。 相似文献
8.
胶州湾及其邻近水域渔业生物多样性的调查研究 总被引：12，自引：7，他引：12
根据2003年10月-2004年5月逐月采集胶州湾及其邻近水域作业的定置网和底拖网具渔获物的分析与测定，记述了该海区出现的106种渔业生物，并进行了定置网和底拖网的渔获物组成的比较，分析了种类组成特点及生物多样性的季节变化情况。结果表明，本调查区域渔获物以小型低值鱼类、经济无脊椎动物和经济幼鱼为主，渔获个体偏小。据此提出了保护近海生物多样性与合理利用近海渔业资源的一些建议。本次调查还首次记录了我国黄海沿岸罕见的蛇鳗科鱼类一长吻沙蛇鳗Ophisurusmacrorhynchus，为青岛近海的渔业生物多样性的研究增添了新的资料。 相似文献
9.
I. A. Zhabin E. V. Dmitrieva N. S. Vanin 《Izvestiya Atmospheric and Oceanic Physics》2017,53(9):965-972
The variability of the upwelling along the western coast of the Kamchatka Peninsula (northeastern part of the Sea of Okhotsk) has been studied based on an analysis of the multisensor satellite data. The intensity of upwelling is estimated on the basis of wind-forced offshore Ekman transport (upwelling index). The wind data for studying the seasonal variation of upwelling were collected in 1999–2009 using a Quik-SCAT/SeaWinds scatterometer. The upwelling events along the western Kamchatka coast were observed in December at the beginning of the winter monsoon period. During the period of strong winter monsoon northern winds from January to the middle of March, the drifting ice prevents the upwelling of the deep water at the western Kamchatka shelf edge under the mean conditions. The oceanographic data show that upwelling in the western coastal zone of Kamchatka was also observed during the transitional periods from winter to the summer monsoon (April). In summer, upwelling events are rarely observed in this region. The main cause of the summer upwelling is the propagation of the atmospheric cyclones over the Kamchatka Peninsula. 相似文献
10.
SeaWiFS遥感资料分析中国海域气溶胶光学厚度的季节变化和分布特征 总被引：1，自引：0，他引：1
通过与地基气溶胶观测数据的对比,确认了SeaWiFS气溶胶光学厚度产品用于研究中国海域气溶胶分布和变化特征的有效性。在此基础上,分析了中国海域气溶胶光学厚度的季节变化和地理分布特征。研究结果表明,中国东部海域平均气溶胶光学厚度存在以中纬度为中心的纬向分布;受沙尘、季风气候的影响,中国海域气溶胶光学厚度存在季节变化,不同海区有不同的季节变化和分布特征。渤海、黄海及东海有类似的变化特征,春季都受到沙尘气溶胶的影响,使中国东部海域气溶胶光学厚度普遍高于0.160,且对东海的影响最大;夏、秋季逐渐减小,冬季有所回升。南海气溶胶光学厚度均值为0.150,随时间变化不明显,但地理分布变化显著;受季风气候的影响,从春季到冬季,气溶胶光学厚度高值中心从高纬海域向低纬海域转移,范围也逐渐扩大。冬季南海大部分海域气溶胶光学厚度都达到0.160以上,是整个中国海域冬季气溶胶光学厚度最大的海区。气溶胶光学厚度的季节变化和地理分布特征为研究中国海区域气候变化和海洋生态提供了依据。 相似文献
11.
应用电泳资料探讨黄海中部秋季带鱼的种群和洄游 总被引：1，自引：0，他引：1
六十年代后期,黄渤海带鱼种群逐渐衰减,到七十年代中期已形不成渔业。但从七十年代末期,黄海中部秋季带鱼的产量又明显的回升,近几年已达到相当的规模,几个主要渔业公司秋季多来此捕捞。这股鱼从何而来?隶属于哪一个种群有不同的看法。这就给渔业生产和研究者们提出了一个新的课题。 研究鱼类洄游的传统方法是标志放流。但它需用活鱼,且因回收率很低,要求放流鱼的数量较多,尤其是象带鱼这样一些离水后容易 相似文献
12.
我国近海区域对气候变化高度敏感,浮游植物生态的变化关系到我国近海生态安全.采用重构的遥感数据等资料,分析并综述我国近海区域浮游植物叶绿素a浓度、初级生产力和浮游植物群落结构对气候变化背景下海水升温、风场等环境因子的响应.结果表明,东(南)中国海叶绿素a浓度略有上升(下降)的趋势,但浮游植物群落结构和生物量有明显的变化;其中,微微型浮游植物和甲藻占比增加,小型浮游植物物种成为海区优势种,暖水性种分布区北扩,而这与气候变化背景下海洋热动力环境的长期变化及其对营养盐供给的影响关系密切.分析还指出了气候变化对我国近海区域海洋生态影响研究迫切需要开展的若干工作. 相似文献
13.
14.
Transport and distribution of nutrients in anchovy spawning ground to the southern waters of Shandong Peninsula 总被引：1，自引：0，他引：1
INTRODUCTIONNutrients (N ,PandSi)areessentialforphytoplanktongrowthinmarineecosystem .Thetransportandcycling ,distributionandvariationofnutrientsaffectnotonlyonthestructureandfunctionofecosystem ,butalsoonthevariationofthebiologicalresourcesinthesea .ThesouthofShondongPeninsulaisoneofthecentralzonesofurbanandagriculturalactivities.Al thoughthereisnodirectlargeriverinput,seasonalvariationofchemicalenvironmentisobviousintheHaizhouBay .Inspringandsummer,thedistributionsofnutrientsareinflu… 相似文献
15.
Accurately estimating the mean and extreme wave statistics and better understanding their directional and seasonal variations are of great importance in the planning and designing of ocean and coastal engineering works. Due to the lack of long-term wave measurement data, the analysis of extreme waves is often based on the numerical wave hind-casting results. In this study, the wave climate in the East China Seas (including the Bohai Sea, the Yellow Sea and the East China Sea) for the past 35 years (1979–2013) is hind-casted using a third generation wave model – WAMC4 (Cycle 4 version of WAM model). Two sets of reanalysis wind data from NCEP (National Centers for Environmental Prediction, USA) and ECMWF (European Centre for Medium-range Weather Forecasts) are used to drive the wave model to generate the long-term wave climate. The hind-casted waves are then analysed to study the mean and extreme wave statistics in the study area. The results show that the mean wave heights decrease from south to north and from sea to land in general. The extreme wave heights with return periods of 50 and 100 years in the summer and autumn seasons are significantly higher than those in the other two seasons, mainly due to the effect of typhoon events. The mean wave heights in the winter season have the highest values, mainly due to the effect of winter monsoon winds. The comparison of extreme wave statistics from both wind fields with the field measurements at several nearshore wave observation stations shows that the extreme waves generated by the ECMWF winds are better than those generated by the NCEP winds. The comparison also shows the extreme waves in deep waters are better reproduced than those in shallow waters, which is partly attributed to the limitations of the wave model used. The results presented in this paper provide useful insight into the wave climate in the area of the East China Seas, as well as the effect of wind data resolution on the simulation of long-term waves. 相似文献
16.
我国海洋渔业地理信息系统发展现状 总被引：1，自引：0，他引：1
详细总结了我国海洋渔业地理信息系统的研究与应用现状,远洋渔业地理信息系统主要应用于金枪鱼、鱿钓业和秋刀鱼的资源分布、渔获量与渔场环境关系、渔情预报、渔场图绘制等方面,近海主要用于分析东海渔业资源分布和漂移特征、渔场环境分布、部分种类渔获量分布与环境关系及渔情预报等方面。除渔业资源与渔场领域外,渔业地理信息系统还被应用到渔船跟踪、捕捞违法行为判别、渔业信息发布和水产品查询,以及渔港建设等领域,国内学者在进行渔业地理信息系统技术应用的同时,还注重了其技术的研究及改进。 相似文献
17.
Seasonal and spatial distributions of phytoplankton biomass associated with monsoon and oceanic environments in the South China Sea 总被引：5，自引：3，他引：2
Seasonal variations of phytoplankton/chlorophyll-a （Chl-a） distribution, sea surface wind, sea height anomaly, sea surface temperature and other oceanic environments for long periods are analyzed in the South China Sea （SCS）, especially in the two typical regions off the east coast of Vietnam and off the northwest coast of Luzon, using remote sensing data and other oceanographic data. The results show that seasonal and spatial distributions of phytoplankton biomass in the SCS are primarily influenced by the monsoon winds and oceanic environments. Off the east coast of Vietnam, Chl-a concentration is a peak in August, a jet shape extending into the interior SCS, which is associated with strong southwesterly monsoon winds, the coastal upwetling induced by offshore Ekman transport and the strong offshore current in the western SCS. In December, high Chl-a concentration appears in the upwelling region off the northwest coast of Luzon and spreads southwestward. Strong mixing by the strong northeasterly monsoon winds, the cyclonic circulation, southwestward coastal currents and river discharge have impacts on distribution of phytoplankton, so that the high phytoplankton biomass extends from the coastal areas over the northern SCS to the entire SCS in winter. These research activities could be important for revealing spatial and temporal patterns of phytoplankton and their interactions with physical environments in the SCS. 相似文献
18.
Puerulus settlement has been monitored throughout the western rock lobster Panulirus cygnus fishery for nearly 40 years. These data, in combination with indices of effort and water temperature, were used to produce recruitment‐catch relationships for each 1° transect of latitude in the coastal part of this fishery from Kalbarri to Cape Leeuwin, as well as at the offshore Abrolhos Islands (total of eight transects). The fine spatial scales of these models provided estimates of certain life history traits that are known to affect lobster catches between adjacent fishing ports. This catch modelling showed that the proportions of 3‐ and 4‐year‐old post‐settlement lobsters contributing to the catches varied markedly from the southern to northern transects, suggesting that juvenile lobsters grow substantially faster in the warmer northern and offshore waters of this fishery. These proportions provide accurate estimates of juvenile growth rates, which are vital in the construction of location‐specific growth algorithms required by the age‐structured models used in the management of this fishery. Model estimates of density‐dependent mortality were greater in the more densely populated centre of the fishery and markedly lower at the northern and southern limits of this species distribution. Annual increases in fishing efficiency were also found to be lowest at the northern and southern extremes of the fishery and greatest in the centre of the fishery, where technology advances and increased fleet mobility have enabled the fleet to increase efficiency by 1–3% each year. Catchability (q) was found to be most influenced by water temperatures in the cooler southern transects, whereas at the Abrolhos Islands, changes in water temperature produced almost no discernable change in q. The catch modelling was also used to quantify the impact of management changes introduced in the 1993/94 fishing season. Increased protection of female lobsters and an 18% pot reduction resulted in a 3–4% permanent reduction in the catch rates of lobsters throughout most of the coastal fishery, whereas at the offshore Abrolhos Islands, catch rates increased by c. 20%, presumably owing to a reduction in the level of pot saturation. 相似文献
19.
本文建立了一个气候态驱动的台湾海峡物理-生态耦合模型（ROMS-NPZD）。与遥感观测数据的比较表明，模型能够较好地模拟出冬、夏季台湾海峡主要的温度和叶绿素分布特征。模型揭示了夏季台湾海峡营养盐输运的东、西通道，与南海次表层水的入侵通道一致；冬季，海峡中的营养盐来源于闽浙沿岸水和通过澎湖水道入侵的南海次表层水。模拟结果表明:夏季，通过海峡流入东海的氮主要为有机氮；冬季，闽浙沿岸流为海峡和南海北部陆架提供了丰富的营养盐，不仅如此，南海次表层水进入海峡的营养盐通量与夏季相当。 相似文献
20.
中国近海海面风场的时空特征分析 总被引：1，自引：0，他引：1
本文利用1987年9月—2013年9月连续26 a的多源卫星融合数据,用经验正交函数方法(EOF)分析中国近海海面风场变化特征。分析结果指出中国近海海面风场的第一模态占总方差贡献的63.94%,呈现为冬-夏季风振荡类型,揭示了中国近海风场的季节变化特征;第二模态占总方差贡献的12.35%,呈现为春-秋振荡类型,反映了冬季风和夏季风过渡时期的变化特征;第三模态占总方差贡献的3.49%,呈现出近似半年周期的波动,体现了中国近海风场季节内变化的特征。 相似文献