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用AVHRR资料计算月平均海水表层温度场 总被引:2,自引:0,他引:2
本文利用AVHRR资料反演海表面温度,并用台站及船舶观测资料进行订正计算月平均海水表层温度场,结果表明,海水表层温度与AVHRR资料反演的海水表面温度之间基本呈线性关系,比例系数接近1.0,位移订正随季节变化较大;用AVHRR资料计算海水表层温度,可以很好地反映海水表层温度在较大尺度上的分布结构。 相似文献
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于1986年1月-11月用高效液相色谱法分析胶州湾10个站位表层和底层海水中溶解游离氨基酸(DFAA)的组成、含量的分布及其季节变化。结果表明,7个站位的表层海水中月平均总溶解游离氨基酸(TDFAA)含量范围为1.24-2.28umol/L。多数站位在2月份处于最低值(0.4umol/L),11月份达最高值(5.0umol/L)。所测氨基酸中,Glu,Gly、Arg、Leu,Orn,Ser等占优势 相似文献
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南海中部海域铵浓度及其与浮游植物的关系 总被引:2,自引:0,他引:2
本文根据1983年9月至1985年1月南海中部海域调查的资料,分析了该海区海水中铵浓度的频率分布,垂直分布特征和次表层铵最大值的形成及其与环境因子的关系。结果表明,铵浓度变化范围在0-2.71μmol/dm^3之间,铵含量小于0.5μmol/dm^3的样品数约为样品总数的78%,铵最大值出现在表层和次表层机率较大。文中还对该海域表层的铵含量与浮游植物的关系进行了初步探讨。 相似文献
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根据闸坡、云澳、硇洲3个海洋站的表层海水温度观测资料,统计了3个站的多年月平均海水温度、极值水温及月平均水温分布规律;通过对月平均温度进行能谱分析,得出水温的变化具有显著的年周期;对旬平均温度进行能谱分析,得出水温变化还具有显著的2a周期和2.8个旬的周期变化。 相似文献
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用磁力浮沉子密度测量装置,在15 ~25 ℃之间的三个温度下测定了珠江口20 个水样的密度。结果表明,测定值皆高于相应条件下国际标准海水状态方程的计算值,在海水盐度范围0.08~33 .446 ,密度平均偏差范围为2 .4 ~54.0 ×10 - 3kg/m3 。测定密度和计算密度的偏差随盐度的降低而增大,与盐度的变化成直线相关:与(Ca2 + )/S、SO42 - /S比和比碱度之间皆呈指数曲线相关。珠江口水样(Ca2 + )/C1 、SO42 - /C1 和比碱度平均值分别超出大洋水平均值17 .8 % 、8 .21 % 和152 % ,其余的Na + /C1、K+ /C1 和Sr2 + /C1 比值与大洋水无明显差别,基本类同。珠江口海水的高碱度、高(Ca2 + )/C1 和高SO42 - /C1 是造成其海水密度正偏差的主要因素。经计算机拟合,首次导出了珠江口海水密度的状态方程,该方程计算值与实验值的平均标准偏差为±2.5×10- 3kg/m3 。 相似文献
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海水盐度对牙鲆仔稚鱼的生长、存活率及白化率的影响 总被引:32,自引:0,他引:32
1993年11月20日自鹿儿岛养殖业购得自然产卵获得的牙鲆受精卵,经空运、陆驼至福冈的九州大学附属水产试验所,仔鱼翌日孵出,3d后开口。以此材料观察研究试验室条件下不同海水盐度对牙鲆仔稚鱼的生长,存活率及白化率的影响。试验分4组,盐度分别为:1组(自然海水对照组),30.5-31.8;2组,26.0:3组,21.0;4组,16.0。每组设2个重复,使用1001透明玻璃钢水槽,每槽放2000尾刚开口 相似文献
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Size-fractionated uranium isotopes in surface waters in the Jiulong Estuary in China 总被引:1,自引:1,他引:0
L E ZHANG Lei CHEN Min QIU Yusheng XING N YANG Weifeng LI Yanping HUANG Yipu 《海洋学报(英文版)》2008,27(1):29-41
Surface water was collected from the Jiulong Estuary for determination of activity concentrations of uranium isotopes in different size fractions, namely, greater than 53, 10 -53, 2 - 10, 0.4 -2 μm, 10 000 u -0.4 μm and less than 10 000 u fractions by microfihration and cross-flow uhrafiltration technologies. Results indicated that most of the dissolved uranium ( 〈 0.4 μm) exis- ted in the low molecular mass fraction ( 〈 10 000 u), and the colloidal uranium-238 (10 000 u -0.4 μm) only contributed less than 1% of the dissolved uranium-238. The fractions of colloidal uranium in the dissolved phases decreased with the increasing sa- linity. A positive linear relationship between uranium-238 activities and salinities was observed for the dissolved, colloidal and low molecular mass fractions, indicating a conservative behavior of uranium in the Jiulong Estuary. In the particulate phases ( 〉 0.4 μm), the partitioning of uranium isotopes among different size fractions was controlled by the partitioning of particle concentrations. In the regions with salinities below 20, the partitioning of uranium-238 among different size fractions was as follows: 10 - 53 μm 〉 2 - 10 μm 〉 0.4 - 2 μm greater than above 53 μm. However, the order at the offshore station with salinities above 30 changed as follows : 0.4 - 2 μm 〉 10 - 53 μm 〉 2 - 10 μm greater than above 53 μm. The fraction of the 0.4 - 2 μm particles increased at the offshore station, suggesting the increased contribution of the authigenic uranium. The activity ratio of uranium-234 to uranium-238 in the dissolved phases, including the low molecular mass fraction and the colloidal fraction, was larger than unity, showing the occurrence of excess uranium-234. In contrast, the activity ratio of uranium-234 to uranium-238 in all size fractions of the particulate phase was close to the equilibrium value (1.0). The observed different values of the activity ratio of uranium-234 to uranium-238 in the dissolved phase and the partic 相似文献
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JIN Xianglong 《海洋学报(英文版)》2013,32(12):1-3
In China submarine geosciences represents a newly established discipline of oceanography, focusing on the oceanic lithosphere, and its interface with the hydrosphere and biosphere. Recently, supported by the National High Technology Research and Development Program and other high-tech development projects, significant progress has been made in the development of advanced technologies and equipment. This en- ables the scientists in China to carry out explorations of the international seabed area in the Pacific Ocean and on the Southwest Indian Ridge. In addition, they have been active in the research activities associated the mid-ocean ridges and western Pacific marginal seas. It is anticipated that this research field will continue to be highly fruitful in the near future. 相似文献
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湄洲湾夏季的初级生产力 总被引:2,自引:3,他引:2
湄洲湾1992年夏季的叶绿素a,三磷酸腺苷,碳比积累速率,初级生产力的变化范围和均值分别为0.45-4.72,1.49mg/m^3;0.12-1.07,0.31μg/dm^3;0.06-0.58,0.34d^-1;0.07-0.34,0.21m/(m^2.d)。叶绿素a与三磷酸腺苷之间。初级生产力与碳比积累速率之间均呈正相关关系。叶绿素a三磷本能腺苷的比值为4.8,湄洲湾夏季浮游植物的生长受氮不足 相似文献
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In order to investigate factors controlling nutrient cycling in the shallow and turbid coastal ecosystem of Galveston Bay, data from: (1) the Texas Water Commission (TWC) database 1980–1989, and (2) salinity transects in 1989 and 1993 are presented and analyzed. Statistical regression and time-series analysis were carried out on data acquired by TWC between 1980 and 1989, in an attempt to establish seasonally of nutrient and chlorophyll-a (chl.-a.) concentrations in the bay and to determine factors which regulate these concentrations.A strong seasonality was found for phosphorus and chl.-a. in the upper and mid-bay stations. A recurring maximum for phosphate occurred in September and a chl.-a. maximum occurred regularly in March–April. It is hypothesized that benthic regeneration of phosphorus at the end of summer is responsible for the phosphate maximum. The inverse correlation of the partition coefficient (Kd) for phosphate with the concentration of suspended particulate matter (SPM), coupled to a strong enrichment of phosphate in suspended particles at low SPM concentrations, indicates additional control by geochemical and physical processes such as particle sorting and/or particle-colloid interactions. Nitrate is inversely correlated with salinity at the upper and mid-bay stations, indicating the Trinity River is a major source.Nutrient concentrations in the lower bay (East and West Bay stations) are considerably lower and less predictable, as they are not correlated with salinity or temperature. Data from the 1989 and 1993 transects confirm the yearly maximum in phosphate concentration in late summer months, with peak concentrations in the upper Trinity Bay. It is concluded that despite possible phosphate buffering by physical and geochemical mechanisms, relatively large concentration maxima recur regularly every year during the summer, possibly caused by a benthic source of phosphate. 相似文献
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中国科学院海洋研究所建所70年来,在海洋贝类分类学研究领域取得了长足发展与进步,做出一系列开创性研究成果。本文综述了建所以来我所海洋腹足类分类学研究方面的主要进展,概述了取得的主要科研成果,分析了现代腹足类分类学研究的发展趋势以及面临的挑战,并对今后的发展提出了相应对策和建议。 相似文献
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《Deep Sea Research Part I: Oceanographic Research Papers》1999,46(8):1391-1415
The biomass, species and chemical composition of the mesozooplankton and their impact on lower food levels were estimated along a transect across the Arctic Ocean. Mesozooplankton biomass in the upper 200 m of the water column was significantly higher (19–42 mg DW m-3) than has previously been reported for the Arctic Ocean, and it reached a maximum at ca. 87°N in the Amundsen Basin. The lowest values were recorded in the Chukchi Sea and Nansen Basin, where ice cover was lower (50–80%) than in the central Arctic Ocean. In the deeper strata (200–500 m) of the Canadian and Eurasian Basins, the biomass was always much lower (4.35–16.44 mg DW m-3). The C/N (g/g) ratio for the mesozooplankton population was high (6.5–8.5) but within the documented range. These high values (when compared to 4.5 at lower latitudes) may be explained by the high lipid content. Mesozooplankton accounted for approximately 40% of the total particulate organic carbon in the upper 100 m of the water column. Mesozooplankton species composition was homogeneous along the transect, consisting mainly of copepods (70–90% of the total number). It was dominated by four large copepod species (Calanus hyperboreus, C. glacialis, C. finmarchicus and Metridia longa), which together accounted for more than 80% of the total biomass. According to measurements of gut pigment and gut turnover rates, the mesozooplankton on average ingested between 6 and 30% of their body carbon per day as phytoplankton. Microzooplankton may have provided an additional source of energy for the mesozooplankton community. These data emphasize the importance of mesozooplankton in the arctic food web and reinforce the idea that the Arctic Ocean should no longer be considered to be a “biological desert”. 相似文献
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