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21.
末次冰期以来东海内陆架沉积反映的海平面变化 总被引:2,自引:0,他引:2
对东海内陆架泥质沉积区MD06-3042孔(27°05.4′N,121°24.1′E,水深62m,岩芯长34.1m)样品进行了高分辨率的粒度分析和14C年代测试,重建了末次冰期以来东海内陆架区的海平面及沉积环境的变化.14.0ka左右,海平面已经到达现今海平面下62m等深线的位置,大量沉积物在此沉积.13.0~4.2ka之间,受海流等多种因素影响,少量沉积物在此沉积.4.2~3.2ka之间,现代东海内陆架的泥质沉积主体在该岩芯附近快速堆积.东海内陆架的泥质沉积体由北向南,由内向外逐渐形成,具有阶段性. 相似文献
22.
东海表层沉积物中重金属集散特征及变化规律 总被引:2,自引:0,他引:2
为研究重金属集散特征及在海洋沉积物中的变化规律,采用π定理建立准则,分别对表征重金属集散特征多因子中的中值粒径、细粒平均粒径及其含量、有机质和粘土含量做了数理统计与分析,建立多元集散控制方程,并运用最小二乘法求解方程中的相关系数.结果表明,该方程能够很好地表征海洋沉积物中重金属元素富集规律及其在海底环境中动态变化过程. 相似文献
23.
黄磊 《大连海事大学学报(自然科学版)》2006,32(3):33-36,56
在烟台外海,潮汐属于正规半日潮性质,而潮流属于日潮流性质.用数值模拟和实测潮流分析两种方法研究了该特征并解释造成这一现象的原因:在烟台外海M2分潮具有驻波振动,存在着M2分潮流的辐聚、辐散现象,因而该海域M2分潮流很小.该海域日分潮流没有辐聚、辐散现象,因而日分潮流相对较强,从而造成了该海域的潮汐、潮流性质相异的特殊现象. 相似文献
24.
提出了一个由1-A的深度非弹性散射和核Drel-Yan过程的实验数据得到价夸克分布和海夸克分布的核效应的函数RAV(xt)和RAs(xt)的方法。这两个函数可以用来检验核子结构的核效应的理论模型。文中以碳核为例求出了RCv(xt)和RCs(xt)。 相似文献
25.
26.
Observation of internal tides and near-inertial motions in the upper 450 m layer of the northern South China Sea 总被引:6,自引:0,他引:6
LIANG Xinfeng ZHANG Xiaoqian TIAN Jiwei 《科学通报(英文版)》2005,50(24):2890-2895
Mooring ADCP current observations from August to November are used to study the barotropic tides, baroclinic tides and near-inertial motions in the upper 450 m layer of the northern South China Sea. The barotropic and baroclinic tides at the mooring station are all dominated by M2, K1, O1, P1, with the barotropic amplitudes being 7.8 cm·s^-1, 7.0 cm·s^-1, 5.4 cm·s^-1 and 3.5 cm·s^-1 respectively. The amplitudes of M2, K1, O1, P1 internal tides vary greatly, which are 12--15 cm·s^-1 in the thermocline, and then decrease with increasing depth. The amplitude of the barootropic near-inertial motions is less than 1 cm·s^-1, contributing little to the barotropic currents. However, that of the baroclinic nearinertial motions can be as large as 5 cm·s^-1. The inclination of tidal ellipse tends to increase with increasing depth, implying upward propagation of energy, while that of the near-inertial ellipse tends to decrease with increasing depth, implying downward propagation of energy. 相似文献
27.
海鳗是一种重要的渔业资源,中国海鳗的最高渔获量达到了31.96×104t(2004年),东海区海鳗渔获量最高达到17.67×104t以上(2004年),其中浙江省海鳗最高渔获量为9.02×104t。根据体长股分析法对海鳗资源量进行初步评估,为渔业管理提供参考,研究样品1394尾来自2002~2005年浙江近海拖虾、单拖、帆张网、流刺网等作业的渔获。估算的结果:海鳗自然死亡系数为M=0.15,捕捞死亡系数为F=1.3;东海区海鳗的平均资源量为12.36×104t,平均资源尾数为308.28×106尾,初始资源量为23.41×104t,最大资源尾数为583.99×106尾。 相似文献
28.
Nikolay Yanshin Aleksandra Kushnareva Valeriia Lemesheva Claudia Birkemeyer Elena Tarakhovskaya 《Molecules (Basel, Switzerland)》2021,26(9)
Though numerous valuable compounds from red algae already experience high demand in medicine, nutrition, and different branches of industry, these organisms are still recognized as an underexploited resource. This study provides a comprehensive characterization of the chemical composition of 15 Arctic red algal species from the perspective of their practical relevance in medicine and the food industry. We show that several virtually unstudied species may be regarded as promising sources of different valuable metabolites and minerals. Thus, several filamentous ceramialean algae (Ceramium virgatum, Polysiphonia stricta, Savoiea arctica) had total protein content of 20–32% of dry weight, which is comparable to or higher than that of already commercially exploited species (Palmaria palmata, Porphyra sp.). Moreover, ceramialean algae contained high amounts of pigments, macronutrients, and ascorbic acid. Euthora cristata (Gigartinales) accumulated free essential amino acids, taurine, pantothenic acid, and floridoside. Thalli of P. palmata and C. virgatum contained the highest amounts of the nonproteinogenic amino acid β-alanine (9.1 and 3.2 μM g−1 DW, respectively). Several red algae tend to accumulate heavy metals; although this may limit their application in the food industry, it makes them promising candidates for phytoremediation or the use as bioindicators. 相似文献
29.
We present the results of a re-analysis of a previously published carbon isotope data-set related to coralline sponges in the Caribbean Sea. The original interpretation led to the discrimination between a pre-industrial period, with a signal controlled by solar-induced climatic variations, followed by the industrial era, characterized by a progressive δ13C negative shift due to the massive anthropogenic carbon emissions. Our re-analysis allowed to extract from the raw isotopic data evidence of a solar forcing still visible during the industrial era, with a particular reference to the 88-year Gleissberg periods. These signals are related to slope changes in both the δ13C versus time and the δ13C versus carbon emission curves. 相似文献
30.
Andrea Gambaro Ivo Moret Rossano Piazza Carlo Andreoli Eleonora Da Rin Gabriele Capodaglio 《International journal of environmental analytical chemistry》2013,93(6-7):401-412
The temporal evolution of concentrations of dimethylsulphide (DMS), its precursor dimethylsulphoniopropionate (DMSP) and chlorophyll a is surveyed weekly in the water column and in a landfast ice core at a coastal station of Gerlache Inlet (Terra Nova Bay, Antarctica) from 27 November 2000 to 14 February 2001. The DMS and DMSP profile concentrations in the water column are similar and show a clear temporal trend, with minimum values (<0.7?nM) at all depths occurring on 27 November 2000 and maximum values (4.8 × 102?nM for DMS and 1.8 × 102?nM for DMSP) in surface water on 27 December 2000 for DMS and on 19 December 2000 for DMSP. When the sea-ice cover is present, the temporal evolution of DMSP closely follows that of chlorophyll a in the water column, supporting the idea that DMSP, and therefore DMS, has a phytoplanktonic origin. However, when the ice cover breaks up during the late austral summer, a second phytoplankton bloom occurs, while the DMSP concentration in the sea-water column remains very low. In the ice core, the results show higher concentrations of DMSP than those of the underlying sea water, highlighting the important role of sea ice in the sulphur cycle of the Antarctic ecosystem. 相似文献