共查询到20条相似文献，搜索用时 984 毫秒
1.
Spatiotemporal variability of the organic matter and the rates of its transformation in the Ob Inlet
The data on the qualitative and quantitative variability of the organic matter (OM) and its transformation rates in the waters of the Ob Inlet during different seasons are considered. The OM distribution was quite nonuniform over the entire Ob Inlet aquatic area: the concentrations of Corg varied from 2.8 to 14.1 mg/L and from 0.32 to 4.59 mg/L for the dissolved and particulate forms, respectively. The maximum concentrations of dissolved OM were registered in the main flow of the Ob River water supplied to the bay, whereas the minimum concentrations were characteristic for the near-bottom layers formed by the Kara Sea waters of high salinity in the northern part of the bay. Both in the summer and in the autumn, the fraction of particulate matter within the total OM reached its maximum values in the mixing zone of the Taz and Ob riverine waters, as well as in the mixing zone of the Ob River and Kara Sea waters. These boundary zones were characterized by the widest variability of the elemental (C: N: P) and biochemical (proteins and carbohydrates) composition of the OM, as well as of its transformation rates measured by the activities of the enzymes (alkaline phosphatase and the electron transport system). 相似文献
2.
This report presents a new analysis of the results of two hydrochemical surveys over the Ob Bay in 2010 performed by the Institute of Fisheries and Oceanography (VNIRO) and the Institute of Oceanology (IO RAS). The unique world feature of the Ob River-Ob Bay system is shown. The water volume in the bay exceeds the average annual runoff of the Ob River, being somewhat under the total runoff of all the inflowing rivers. Because of this, the complete renovation of the waters in the bay requires a long time. The within-year distribution of the runoff is characterized by both the flood waters and those of the Ob River winter runoff characterized by much different hydrochemical parameters registered even in the course of summer surveys in the bay. This fact, but not the biological transformation of the waters, as assumed previously, is the primary cause of the variability of the water composition in the bay. The summer waters of the Ob River reach the sea-ward boundary of the bay only in the next spring, enter the Kara Sea with the spring flood, and form lenses of desalinated waters in the sea. The autumn expeditions by the IO RAS found that the waters in the lenses were quite similar to the autumn waters in the bay, although these were the Ob River waters of different years, which was disregarded formerly. 相似文献
3.
The report presents the results of hydrophysical and hydrochemical studies in Blagopoluchiya Bay (Novaya Zemlya Archipelago) based on data of integrated expeditions of the Institute of Oceanology in the Kara Sea in 2007, 2013, and 2014. The main focus was the influence of the Ob and Yenisei rivers, as well as of the runoff of meltwaters from the coasts of the archipelago on the hydrochemical and hydrophysical structures of the bay waters. The features of water exchange between the bay and adjacent aquatic area are considered, along with the renewal mechanisms for deep waters in the bay (deeper than 100 m). The possible occurrence of stagnant effects in deep layers of the bay is evaluated. 相似文献
4.
This paper considers different types of the continental runoff distribution over the Kara Sea depending on hydrological and meteorological processes based on 1993–2014 expedition data of the Shirshov Institute of Oceanology. The results of calculating the relative contribution of fresh water from several sources (the Ob and Yenisei rivers and melted ice) using hydrochemical parameters are also given. 相似文献
5.
In 1993 and 2007 when the expeditions of the Shirshov Institute of Oceanology were performed in the Kara Sea, a significant
part of its aquatic area was occupied by lenses of desalinated water. The fresh-water is supplied by the runoff of the Ob
and Yenisei rivers, as well as by meltwaters. The report considers the features of the freshwater chemical transformation
in the sea. It is shown that the contribution of meltwaters is small in the highly desalinated lenses (with salinity below
15‰) and the freshwater is supplied by the riverine runoff. It is also shown that, under definite conditions, it is possible
to determine the relative shares of the Ob and Yenisei waters using the chemical parameters (the silicon and alkalinity).
The data of 1993 when two lenses as such were found in the sea were confirmed; at that, the waters of the Yenisei and Ob rivers
were prevailing in the western and northeastern lenses, respectively. In 2007, one lens was found in the treated area of the
sea. It is shown that the chemical characteristics of the freshwater in the lens appeared to be sufficiently different from
those of the Ob river but similar to the Yenisei river’s characteristics according to the data of 1993. A map of the Ob’s
and the Yenisei’s water spreading over the sea’s aquatic area is presented. 相似文献
6.
The stalked barnacle Pollicipes pollicipes is a cirriped crustacean that lives on very exposed rocky shores. This barnacle is the most important economical resource on intertidal rocky shores of continental Portugal. It is highly prized as food and heavily exploited (professional and recreational fishery), but fishery data are scarce and do not estimate the real pressure upon this resource.Despite its socio-economic interest, specific regulations on this fishery are recent and different along the Portuguese coast. Four regions with different regulation can be identified: the marine reserve “Reserva Natural das Berlengas” (RNB) and the marine park “Parque Marinho Prof. Luiz Saldanha” (PMLS) (both in central Portugal); the natural park located in SW Portugal (“Parque Natural do Sudoeste Alentejano e Costa Vicentina”, PNSACV); and the rest of the coast.The main objective of the present study was to study the spatial patterns of percentage cover, biomass, density and size structure of P. pollicipes in areas with different exploitation regimes, including harvested areas and no-take areas. Additionally, variability between mid shore and low shore barnacles was also analysed.Seven areas were sampled with a variable number of sites (a total of 24) randomly sampled in each area during 2011. Photographs and image analysis (percentage cover) and destructive sampling (density, biomass and size) were used.In general, percentage cover, biomass and density were higher in mid shore when compared to low shore, namely in harvested areas. Low shore barnacles had a higher proportion of adults with moderate and high commercial value, while juveniles were relatively more abundant at mid shore.There were no consistent differences in the patterns of distribution and abundance of P. pollicipes among areas subject to different exploitation regimes. The most different area was the harvested area by professional fishers in RNB, where the highest biomass within the study was registered (mid shore, 7.7 kg·m− 2). Barnacles within this area presented a higher proportion of adults with commercial value, while recruits and juveniles were relatively more abundant in other areas.The hypothesis of a highest percentage cover, density and biomass in the low shore of no-take sites was not supported. 相似文献
7.
E. P. Dulepova 《Oceanology》2008,48(3):378-382
An analysis of the structural and functional characteristics of zooplankton community and their coupling with the synoptic situation was carried out for the spring period in the northern Sea of Okhotsk. The years of 2000 and 2001 may be referred to as “cold” type due to the significant extent of the ice-covered area. Based on the ice cover extent, the years of 2004 and 2005 may be referred to as “warm” years due to the decreased extent of the ice-covered area. The “cold” and “warm” years did not significantly differ from each other in terms of the total zooplankton biomass. In the northeast Sea of Okhotsk, the zooplankton abundance increased during the “cold” years, while, in its northwestern part, the zooplankton abundance increased during the “warm” years. The different types of years significantly differ in the species structure of the macrozooplankton community. The abundance of copepods was higher in the “warm” years, whereas the chaetognath abundance increased in the “cold” ones. These features of the dynamics and distribution of zooplankton in the northern part of the Sea of Okhotsk also affected its productivity. The higher production of the elements of the zooplankton community that was revealed in the “warm” years was caused by the increase in the seasonal P/B ratio of both nonpredatory and predatory species. In the “warm” years, the production of nonpredatory zooplankton was higher in the northwest, while, in the “cold” years, it was higher in the northeast of the area. 相似文献
8.
The distributional patterns of the dissolved forms of the major ions, biogenic elements, and trace elements were analyzed
in the mouth areas of small watersheds of the southern coast of the Kola Peninsula (the stream in the Por’ya Inlet, the Indera
River, and the Chavan’ga River). These results were compared to the data obtained under hydrochemical studies performed in
the river mouth areas of the White Sea basin. During the productive period, dissolved phosphates (20–46%) and dissolved silica
(3–22%) are removed from the continental runoff along the White Sea coast due to the biological assimilation of these elements.
The migrations of the major ions, as well as F, Rb, Cs, Sr, Mo, U, and Ni, may be described by the equation of the conservative
mixing of the riverine and seawater masses. The distribution of Ba is characterized by pronounced spatial variability and
is governed, apparently, by the sorption-desorption processes. An increase of the chloride concentration, which gradually
slows down at the marginal filter area, is observed together with the sharp decrease of the Fe, Al, Y, and rare earth elements
(La, Ce, Nd, and Dy), as well as for Ti and Zr. Presumably, this decrease is caused by the removal of these elements from
the solution by coagulation and flocculation as organic and organic-mineral colloids. The behavior of the dissolved Mn is
characterized by specific features in the river mouth areas of the White Sea, including the increase of its concentration
at the initial stages of the riverine-seawater mixing, which, in turn, is a result of its desorption from the terrigenous
suspended matter. This increase is followed by a nonlinear decrease, possibly, due to the flocculation of colloids. 相似文献
9.
本文利用ADCIRC模型,在宁波市北仑区建立了街区尺度的风暴潮漫滩模型,北仑区陆地分辨率达5～10 m。模拟结果整体展现漫滩淹没城市街道建筑的过程,细致刻画了水流在街区和建筑错综复杂分布时的流动情况,以及不同建筑物附近水深的变化,比以往的漫滩模拟更加精细,体现街区尺度网格的优势。数值模拟结果表明:此模型可以较好地模拟1211号台风“海葵”和5612号台风“温黛”的风暴潮过程。利用卫星遥感图像对北仑区地物进行分类,考虑下垫面底摩擦变化对漫滩模拟的影响。对比未考虑底摩擦情况的模拟实验结果,淹没面积减少了21.4%,大部分区域水深降低在0.1～0.2 m,街区尺度网格细致展示出不同地物所在区域的水深降低程度以及淹没面积变化。 相似文献
10.
The paper summarizes results on the content and composition of aliphatic hydrocarbons (HCs) in suspended particulate matter (SPM) and bottom sediments in the Kara, Laptev, and East Siberian seas obtained in 2015–2018. It was established that the “losses” in HC concentrations in surface waters in the river (Ob, Yenisei, Lena, Khatanga, Indigirka, Kolyma) and seawater mixing zone in some cases exceeded their river removal by 90%. The composition of HCs in surface waters depends on the characteristics of the river catchment area, sampling season. and time of day (high/low tide) and basically coincides with the SPM distribution. In the pelagic zone of the seas, the HC content is close to the background (2–7 μg/L). The influence of anthropogenic input was established only in the Gulf of Ob, where the composition of alkanes is close to oil with a HC content of 86 μg/mg SPM. In bottom sediments, the particle size distribution determines the HCs, and terrigenous n-alkanes play the dominant role in the molecular composition.
相似文献11.
象山港水交换数值研究 Ⅱ.模型应用和水交换研究 总被引：21，自引：4，他引：21
使用水平二维对流－扩散型水交换模式模拟研究了象山港的水交换,对不同区域的水交换控制机理作了初步探讨,象山港水交换状况与其控制机制的区域性变化很大。牛鼻水道至佛渡水道是一个潮流较强的潮通道;９０％水交换周期为５天左右。象山港狭湾内水交换周期较长,湾顶处９０％水交换的周期约为８０天左右。 相似文献
12.
O. I. Podymov 《Oceanology》2008,48(5):656-663
A problem-oriented database (PODB) was developed for the statistical analysis of the hydrochemical characteristics of the redox layer of the Black Sea. The paper describes the features of the PODB, including the algorithm of interpolation and the location of the levels of the appearance and disappearance of hydrochemical parameters (the so-called onset levels) based on Akima’s spline. The application of the PODB allowed us to obtain a series of biogeochemical estimates, in particular, (1) to reveal the constancy of the vertical gradients of the hydrochemical parameters at selected density levels; (2) to calculate the seasonal variability of the degree of manifestation of the phosphate minimum in the near-shore and open sea areas; and (3) to calculate the interannual variability of the level of the disappearance of the hydrogen sulfide, ammonium, total manganese, and methane, as well as the oxygen content in the cold intermediate layer, and to find out their relations with the climatic variations. 相似文献
13.
P. N. Makkaveev P. A. Stunzhas Z. G. Mel’nikova P. V. Khlebopashev Sh. Kh. Yakubov 《Oceanology》2010,50(5):688-697
Hydrochemical studies of the Kara Sea were included into the program of the integrated expedition during cruise 54 of the
R/V Akademik Mstislav Keldysh (September 9–30, 2007). In several sea areas quite different in their weather conditions, a large set of hydrochemical analyses
was carried out, including the determination of the primary nutrients (silicon and different forms of nitrogen and phosphorus),
the dissolved oxygen content, and the total alkalinity and pH values. The report presents the hydrochemical conditions in
the southwestern part of the Kara Sea and the most striking results from the authors’ viewpoint. The data were compared to
those of the integrated oceanographic expedition of cruise 49 of the R/V Dmitry Mendeleev in 1993. 相似文献
14.
The Bohai Bay Basin is a classic non-marine rift basin in eastern China. The Paleogene Dongying sequences are the main hydrocarbon-bearing stratigraphic unit in the basin. Using three-dimensional (3-D) seismic data and one well control in the BZ3-1 Block in the western slope of the Bozhong Sag, we analyzed 3-D facies architectures of the Dongying sequences. The Dongying Formation, a second-order sequence, can be subdivided into four third-order sequences (from base to top: SQ1, SQ2, SQ3, and SQ4). The facies architecture was analyzed by using the seismic sedimentology approach based on 3-D seismic data. Sediment of the Dongying sequences was derived from the northern Shijiutuo Uplift via four major configurations of incised valleys, namely “V”, “U”, “W”, and composite shaped incised valleys. Seismic stratal slices reveal branching and converging characteristics of the channels from upstream to downstream. On the basis of an integrated analysis of well log, core data, seismic facies based on multi-seismic attributes, three sedimentary facies (e.g., “delta”, “fan-delta”, and “shore” or “shallow lacustrine” facies) have been recognized. The four types of incised valleys and their evolution control the sedimentary systems in the sedimentation area. The numbers and sizes of the fans are controlled by the sedimentary systems at various scales. Incised valley-fill and deltaic sand bodies are excellent hydrocarbon reservoirs and potentially good exploration targets for the study area. The reservoir quality of sequences SQ1, SQ2, and SQ3 become better gradually from base to top. The proposed sediment dispersal patterns may aid in the prediction of potential reservoir distribution. This study also demonstrates that facies architecture analysis using sequence stratigraphy and seismic sedimentology may serve as an effective approach for constructing 3D facies models for petroleum exploration in areas lacking of well or outcrop data. 相似文献
15.
Oceanology - This paper reports the results of investigations on the radioecological state of bottom sediments of the Ob–Yenisei shoal area and Ob and Yenisei estuaries. Materials were... 相似文献
16.
象山港分区水交换数值研究 总被引：5，自引：1，他引：4
在验证良好的三维斜压潮流数学模型的基础上,将象山港划分成7个海区,以7种不同的溶解态保守性物质为示踪剂,建立对流-扩散型的海湾水交换数值模型,采用关联矩阵法来描述各区之间以及各区与外海之间的水交换特性。通过不同示踪剂的浓度分布,计算了15、30、45、60和80d的水交换矩阵。由各时刻水交换矩阵可知,在象山港的7个子区中与湾外水的水交换速度最快的为Ⅰ区,最慢的为Ⅶ区。Ⅲ区(西沪港)、Ⅵ区(黄墩港)和Ⅶ区(铁港)内水体与湾外海水之间的水交换速度缓慢,但与区域外水体之间的交换速度要明显快于其他几个海区。从水交换矩阵可以看出西沪港、黄墩港和3个内港之间相互交换的海水量很小。 相似文献
17.
The paleokarst-unconformity at the top of the Ordovician Yingshan Formation in the central Tarim basin was exposed to air for at least 10 Ma, providing favorable conditions for the later formation of high-quality reservoirs. During the karstification process, the fault system plays an important role in controlling the development of paleokarst. This study characterized the fault system through the paleokarst features on the northern slope of the Tazhong High and examined in detail the impacts of the fault system on paleokarst distribution. Formation Micro-Imager logs and seismic curvature change rate were used for characterizing the fault system in different scales. The results revealed three sets of faults in this region. Cross-cutting relationships, unconformities, and relation between faults and karstification indicate Mid-to-Late Ordovician thrust faults, Silurian-Devonian strike-slip faults, and Permian tension faults. “Bright spots” in seismic records calibrated by Formation Micro-Imager logs were used for indicating paleokarst features and different depth distributions, respectively. Furthermore, the study employed spectral decomposition technique to characterize the morphology of paleocave complexes in detail. The results show the Mid-Late Ordovician thrust faults heavily impacted the distribution of paleokarst mainly distributed along master and secondary thrust faults in shallow areas, as well as along master basement-involved thrust faults in deep strata, and along the most pronounced area of paleokarst, Tazhong No. 10 fault zone bounded by back thrusts. The data provides new forecasting information for deep hydrocarbon exploration in paleokarst-related reservoirs of the Yingshan Formation. 相似文献
18.
《Oceanologica Acta》1998,21(1):87-93
A space-time approach is adopted in an attempt to understand the long-term influence of currents on the spatial pattern distribution of zooplankton, ichthyoplankton, and fish larvae communities in the Bay of Campeche, Mexico.The analysis is performed using results of a hydrodynamic numerical model, and zooplankton and ichthyoplankton abundances.Three fish larvae communities were identified in the Bay, on the basis of its physiography, i.e.: “neritic fluvio lagoon influence”, “neritic” and “oceanic” communities.A cyclonic eddy is formed in the Bay and drifts westward, facilitating transport and distribution of planktonic organisms. The eddy provides larvae transport from oceanic areas to the coastal areas and vice-versa. The seasonal distribution of fish larvae is highly influenced by the position of the eddy.The biomass pattern and fish larvae density observed in the coastal area off the Grijalva-Usumacinta delta are governed by the coastal front. 相似文献
19.
N. D. Romanova V. K. Chasovnikov E. G. Arashkevich S. A. Mosharov A. B. Nikishina A. V. Kostyleva N. E. Louppova 《Oceanology》2016,56(1):114-117
The water conditions and trophic status in the shelf-slope zone and bays of the northeastern Black Sea were evaluated on the basis of monitoring data from 2007–2014. It has been shown that the concentrations of nutrients and chlorophyll “a” in the studied area are at the level of the pristine period (of the late 1970s). The concentration of mineral nitrogen in the surface water layer varied from 0.19 to 5.64 μM. The concentration of phosphates differed from analytical zero to 0.56 μM. The concentration of chlorophyll “a” in different seasons ranged from 0.24 to 0.89 μg/L. The trophic index characterizes the status of the marine shelf ecosystem near Gelendzhik city as “excellent” even in the bays. Significant year-to-year differences in the index were not detected. The range between the values of the trophic index in the bays and open sea was low (3.7 and 3.2, respectively). 相似文献
20.
地层水水化学性质与油气成藏具有重要关系,在东营凹陷地层水水化学数据及地质资料分析基础上,明确其古近系地层水水化学具明显的平面分区性及垂向分带性。地层水水化学变化除受原始沉积环境及气候影响外,还受到后期压实排水、外来流体及断裂活动等因素的制约,同时成岩过程中矿物转化脱水和耗水对其也有重要的影响。 相似文献