中国近海海平面变化研究进展   总被引：9，自引：0，他引：9  

于宜法 《中国海洋大学学报(自然科学版)》2004,34(5):713-719

回顾和总结了近年来有关我国近海地区海平面变化的研究进展。综述了海平面变化的原因，海平面资料获取手段的发展，分析研究海平面变化的方法和模型以及海平面上升速率方面的主要成果；简要介绍了海平面均衡基准订正的意义和主要结论；阐述了1985国家高程基准研究工作和成果。  相似文献   

Measurements of biomass and activity of neustonic microorganisms     

Y. De Souza Lima  M.J. Chretiennot-Dinet 《Estuarine, Coastal and Shelf Science》1984,19(2):167-180

Microlayer samples from a coastal marine area near Marseilles (France) collected in 1979 and 1980 have been analysed for POC, PON, chlorophyll a, ATP, cell counts, carbon fixation and in some cases for heterotrophic activity. Comparison of microlayer data with those of underlying water showed in most cases enrichment of organic matter and microorganisms in the surface microlayer. Carbon fixation values were comparable to those observed at 0·50 m except in the slicks, where phytoneustonic activity was higher than that of the underlying phytoplankton. Though total heterotrophic activity was higher in the surface film, the turnover time was not significantly different in both microlayer and underlying water. Our data show that enrichment is highly dependent on sea conditions; whenever slicks are present, the surface film seems to function like an eutrophic system, including active living material, although detritus is regularly present in large amounts.  相似文献   

Nitrogen and phosphorus concentrations within North Inlet,South Carolina—Speculation as to sources and sinks     

Thomas G. Wolaver  William Johnson  Marvin Marozas 《Estuarine, Coastal and Shelf Science》1984,19(2):243-255

The daily concentrations of $\text{NH}{}_4{}^{\mathrm{+}}$, $\text{NO}{}_3{}^{\mathrm{?}}$, and $\text{NO}{}_3{}^{\mathrm{?}}\text{+ NO}{}_2{}^{\mathrm{?}}$ within the North Inlet system are all negatively associated with tidal stage during the late summer, this association breaking down during the winter. The high concentrations of these constituents during low tide coupled with the lack of streamflow during the late summer suggests that there is an internal source for these species. Ammonium and orthophosphate most likely have their source in sediment diffusion from tidal creek sediments and/or seepage from the vegetated marsh surface during tidal exposure. It is hypothesized that high nitrate plus nitrite values at low tide are caused by nitrification within the tidal water or tidal creek sediments. During the summer there is evidence for a source of dissolved organic nitrogen and dissolved organic phosphorus within the North Inlet system, probably via diffusion from creek sediments. In general the main source of dissolved organic nitrogen is via stream-flow from the adjacent watershed. Particulate nitrogen and phosphorus concentrations are a function of: (1) wind and rain events which cause resuspension of particulate material from the tidal creek banks, (2) rain events which scour the marsh surface during tidal exposure, and (3) high tidal velocities which scour the creek bottoms.  相似文献   

OBSERVATION OF A SHALLOW WATER INTERNAL OSCILLATION EVENT     

高抒 《中国海洋湖沼学报》2002,20(1):86-90

At a shallow water station (6 m in depth), an internal oscillation event which consisted of one or two wave-like features, with a period of 3 h and a height of 1.5 m, was observed. The velocities within the water column were modified by the event during the flood phase of the tide ; a multilayered velocity structure and intense shear were generated. Further investigations are required to understand fully the mechanism for the formation of such an event.  相似文献   

The Use of Pigment Signatures to Assess Phytoplankton Assemblage Structure in Estuarine Waters     

A. Ansotegui  J. M. Trigueros  E. Orive 《Estuarine, Coastal and Shelf Science》2001,52(6):689

The seasonal dynamics of chlorophyll a and the main accessory pigments accompanied by microscopic observations on live and fixed material were investigated in the Urdaibai estuary, Spain. Fucoxanthin was the dominant pigment during the peak in chlorophyll a, with which it was strongly correlated. Concentrations of fucoxanthin (81·30 μg l⁻¹) in the upper estuary were amongst the highest found in the literature, and were mainly associated with diatoms and symbiotic dinoflagellates. In the lower estuary, fucoxanthin showed values typical of coastal waters (<5 μg l⁻¹) and was mainly due to diatoms and prymnesiophytes. Chlorophyllb concentration was high along the estuary, followed the same seasonal pattern as chlorophyll a, and was associated with the presence of euglenophytes, chlorophytes and prasinophytes. High values of 19′-butanoyloxyfucoxanthin were often measured, but no organisms containing this pigment were observed in live or fixed samples. Alloxanthin and peridinin were found in low concentrations which was in agreement with cell counts of cryptophytes and peridinin-containing dinoflagellates. Two main patterns of phytoplankton assemblages were observed along the estuary. In the upper segments, during the chlorophylla maximum fucoxanthin containing algae masked the other algal groups, which were relatively more abundant during or after enhanced river flows. In the lower estuary, although dominated by fucoxanthin-containing algae, the other algal groups were important all year around. In this study, the use of diagnostic pigments has provided considerable insight into the temporal and spatial dynamics of phytoplankton assemblages by detecting phytoplankton taxa generally underestimated or overlooked by microscopy.  相似文献   

塔里木盆地油田水的成因与演化   总被引：9，自引：0，他引：9  

蔡春芳  曾凡刚 《地质论评》1997,43(6):650-657

塔里木盆地油田水具有高矿化度，相对贫镁，富钙，富锶等特点，在含油层中铝浓度高，铝可能以有机络合物形成存在。氢氧同位素测量值表明；侏罗系，三叠系及寒武系－奥陶系内幕油田水为成岩改造原生水；白垩系，第三系为同生沉积水蒸发五余；侏罗系与石炭系，三叠系与石炭系的不整合面附近及奥陶系顶部，塔中地区石炭系是淡水与成岩改造或蒸发残余原生水混合成因。  相似文献   

我国近海平均海面及其变化的研究   总被引：5，自引：1，他引：5  

文援兰  杨元喜 《武汉大学学报(信息科学版)》2001,26(2):127-132

建立了计算平均海面及其变化的动态抗差模型，并把它与计算平均海面的平均值法、抗差法和动态模型法作了实测数据的计算和比较，表明动态抗差模型不仅能顾及海面动态变化反应，而且能削弱海面异常变化的影响，其结果更稳定可靠，优于其他方法。最后应用动态抗差模型，计算了我国42个验潮站的平均海面及其变化，结果表明，从50年代到70提供，我国近海的海面平均以0．621mm/a的速率上升。  相似文献   

The chemistry of the anoxic waters in the Framvaren Fjord,Norway     

Wensheng Yao  Frank J. Millero 《Aquatic Geochemistry》1995,1(1):53-88

In the summer of 1993, a number of chemical parameters (H₂S, O₂, pH, TA, TCO₂, NH ₄ ⁺ , PO ₄ ^3– , SiO₂, Mn²⁺ and Fe²⁺) were measured in the Framvaren Fjord, a permanently super-anoxic fjord in southern Norway. The extremely steep gradient of sulfide near the interface suggests that other than downward flux of oxygen, three other possible oxidants, particulate manganese and iron oxides, phototrophic sulfur oxidation bacteria and horizontally transported oxygen account for the oxidation of the upward flux of H₂S. Water intrusion through the sill accounts for the temperature inflection above the interface, which, together with internal waves (Stigerbrandt and Molvaer, 1988), may cause fluctuations of the depth of interface. Significant gradients of hydrographic properties and chemical species between 80–100 m suggest that there is a second interface at about 90 m that separates the deep and older bottom waters. A stoichiometric model is applied to examine the biogeochemical cycles of S, C, N and P in the Framvaren. High C:S, C:N and C:P ratios are found while the nutrients (N, P) have Redfield ratio. Based on the C:N:P ratio of 155:16:1 in organic matter, about 30% of sulfide produced by sulfate reduction is estimated to be removed by processes such as oxidation, formation of FeS₂, degassing and incorporation into organic matter. The rates of oxidation of H₂S by Mn and Fe oxides in the water near the interface were slightly faster than the observed values in the laboratory, probably due to the presence of bacteria.  相似文献   

烟台、威海南部近岸海域物理自净能力研究——Ⅰ.潮流模型     

郑连远  田晖  郭耀同 《中国海洋大学学报(自然科学版)》1994,(Z1)

采用不规则三角形网格,利用变边界分步杂交法汁算烟台、威海南部近岸海域的潮流分布,指出此海城属于正规半日潮海域,潮波由北向南传播。  相似文献   

南麂列岛附近海域的浮游植物和赤潮生物   总被引：3，自引：0，他引：3  

张志道  陆斗定 《海洋学研究》1996,14(3):13-20

１９９０年４月和１０月在南麂列岛附近海域进行了两个航次的浮游植物采样调查，共检出浮游植物９７种，隶属于３６属。春季同样浮游植物的平均丰度为２９．７×１０４个／ｍ３，水样浮游植物平均丰度达５２７６０×１０４个／ｍ３。优势种有三鳍原角藻Ｐｒｏｒｏｃｅｎｔｒｕｍｔｒｉｅｓｔｉｎｉｕｍ、夜光藻Ｎｏｃｔｉｌｕｃａｓｃｉｎｔｉｌｌａｎｓ和威氏圆筛藻Ｃｏｓｃｉｎｏｄｉｓｃｕｓｗａｉｌｅｓｉｉ。秋季浮游植物同样的平均丰度为３２．５×１０４个／ｍ３；水样浮游植物平均丰度为９２８×１０４个／ｍ３。优势类群有角刺藻Ｃｈａｅｔｏｃｅｒｏｓｓｐｐ、圆筛藻Ｃｏｓｃｉｎｏｄｉｓｃｕｓｓｐｐ、角藻Ｃｅｒａｔｉｕｍｓｐｐ、海毛藻Ｔｈａｌａｓｓｉｏｔｈｒｉｘｓｐｐ、根管藻Ｒｈｉｚｏｓｏｌｅｎｉａｓｐｐ、骨条藻Ｓｋｅｌｅｔｏｎｅｍａｃｏｓｔａｔｕｍ等。该海区春秋两季均存在多种赤潮生物。  相似文献