A map series of the Southern East Pacific Rise and its flanks, 15° S to 19° S     

Daniel S. Scheirer  Ken C. Macdonald  Donald W. Forsyth  Stephen P. Miller  Dawn J. Wright  Marie-Hélène Cormier  Charles M. Weiland 《Marine Geophysical Researches》1996,18(1):1-12

Four large-scale bathymetric maps of the Southern East Pacific Rise and its flanks between 15° S and 19° S display many of the unique features of this superfast spreading environment including abundant seamounts (the Rano Rahi Field), axial discontinuities, discontinuity migration, and abyssal hill variation. Along with a summary of the regional geology, these maps will provide a valuable reference for other sea-going programs on-and off-axis in this area, including the Mantle ELectromagnetic and Tomography (MELT) experiment.  相似文献   

Cloning of the major 3-MC inducible phase I and phase II detoxification enzymes of plaice liver     

L. Pirrit  R. Healey  H. Assheton  M.J. Leaver  S.G. George 《Marine environmental research》1995,39(1-4)

cDNA's coding for cytochrome P4501A1 (CYP1A1), phenol UDP-glucuronosyltransferase (UDPGT) and glutathione S-transferase (GST-A) were cloned and sequenced from an expression library prepared from the liver of a 3-methylcholanthrene (3-MC) induced plaice. Plaice CYP1A1 and Phenol UDPGT display a high degree of structural conservation with homologous mammalian isoforms and their mRNAs were shown to be highly induced in liver after 3-MC treatment of fish. Expression of plaice GST-A, which displays closer homology to GSTs from plants and invertebrates than those of mammals, is repressed after 3-MC treatment.  相似文献   

Investigation of internal waves generated by a diurnal barotropic tide in the vicinity of an oceanic ridge     

S. V. Dovgaya  L. V. Cherkesov 《Physical Oceanography》1994,5(4):237-246

Internal waves occurring near an oceanic ridge as a result of impingement of a barotropic tide are scrutinized in terms of the long theory for long waves. The ocean is assumed to be double-layered, the relief continuously changing, and the tidal wave on-running at an arbitrary angle. The dependences of the wave amplitudes and horizontal velocities on the ridge's latitude, the angle of tide running, and the depth of the density jump layer are obtained. Similar investigations for the model bottom relief have been conducted in refs 1 and 3.Translated by Vladimir A. Puchkin.  相似文献   

Prediction of hydrological phenomena using self-organizing mathematical models   总被引：1，自引：0，他引：1  

E. F. Vasechkina  I. E. Timchenko  V. D. Yarin 《Physical Oceanography》1997,8(3):185-193

The paper considers the application of self-organizing models, specifically, the method of grouped arguments consideration (MGAC), to forecast short and non-stationary time series of observations in the ocean. A sequence of operations for the treatment of observational series is suggested. To assess its efficiency, we have used mean monthly oxygen concentration data collected in the surface and near-bottom layers of the Taganrog Bay. It is shown that the application of the MGAC model allows one to reduce by two times the root-mean-square error of that of the series prediction by five points, in comparison with the Jenkins-Box regressional model. It has been concluded that the predictors' non-linear functions may be effectively used in the treatment of short samplings. Translated by Vladimir A. Puchkin.  相似文献   

Numerical modelling of the Sea of Azov's dynamics resulting from narrowing of the mouth of Taganrog Bay     

F. A. Surkov  L. A. Krukier  G. V. Muratova 《Physical Oceanography》1990,1(6):551-559

The currents and surface level oscillations in the Sea of Azov ensuing from contraction of the mouth of Taganrog Bay are computed using the grid technique on the basis of a numerical solution to the system of quasi-linear, degenerate, parabolic, partial derivative equations (shallow-water equations). It is demonstrated what changes are to be expected in the dynamics of the Sea of Azov should this project be realized. The computations were carried out for typical wind directions.Translated by Vladimir A. Puchkin.  相似文献   

Experimental research on the hydrophysical characteristics and dynamics of waters in the north-west Black Sea in the region of the main Black Sea current     

V. A. Blinkov  V. A. Dulov  O. V. Shul'gin 《Physical Oceanography》1992,3(5):383-389

The results of measurements of hydrophysical parameters in the upper layer of the sea at an observation site located south-west of the Crimea are reported. The current pattern, the distribution of the upwelling and downwelling zones at the observation site, and the location of the mesoscale fronts are discussed.Translated by Mikhail M. Trufanov.  相似文献   

The choice of a dynamico-stochastic model for ocean monitoring — A compromise between the accuracy and cost of computations     

I. E. Timchenko  V. O. Belozersky  S. I. Khlopushina  V. A. Benzhitsky 《Physical Oceanography》1989,1(2):111-119

In this paper we compare, two dynamico-stochastic models (DSMs) with different hydrodynamic parts, designed to study a large-scale North Atlantic region. As a performance criterion, RMS errors (over the horizon) in density and velocity field reconstruction are used. It has been shown that in some cases it seems rational to use DSMs with simplified hydrodynamic parts. This helps to expedite the computations and to reduce the related costs without much detriment to the quality of hydrophysical field simulation.UDK 551.465.001.573(261.1).Translated by Vladimir A. Puchkin.  相似文献   

Food and feeding ecology of juvenile albacore, Thunnus alalunga, off the Bay of Biscay: a case study     

Pusineri  C.; Vasseur  Y.; Hassani  S.; Meynier  L.; Spitz  J.; Ridoux  V. 《ICES Journal of Marine Science》2005,62(1):116-122

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Preservation conditions and the use of sediment pigments as a tool for recent ecological reconstruction in four Northern European estuaries   总被引：4，自引：0，他引：4  

N. Reuss  D.J. Conley  T.S. Bianchi 《Marine Chemistry》2005,95(3-4):283-302

Down-core sediment pigment concentrations from four Northern European estuaries were measured using high-performance liquid chromatography (HPLC) to investigate phytoplankton community structure and preservation conditions over the last ca. 100 years where all sites have experienced different levels of eutrophication. Phytoplankton pigments have been shown to be useful biomarkers for phytoplankton community structure and abundance due to their taxonomic specificity. The pigment concentrations and sediment pigment inventory showed large variation between the four sites. Concentrations ranged from more than 6000 nmol/g OC to less than 100 nmol/g OC and the inventory integrated over the top 10 cm from more than 300 nmol/cm² to less than 30 nmol/cm² for total identified pigments. Good pigment preservation in Mariager Fjord (Denmark) reflected the almost permanently anoxic conditions. Pigments in Laajalahti (Finland) showed peak concentrations around the time of highest nitrogen loading events known from historical and modelled records over the past 100 years. In contrast, poor down-core preservation of pigments (especially carotenoids) was observed in the Ems-Dollard (The Netherlands) and Himmerfjärden (Sweden) estuaries. The Ems-Dollard site is an intertidal mudflat that experiences daily exposure to light and air, which enhances pigment degradation. In Himmerfjärden, resuspension is an important process affecting both the sedimentation rate and degradation properties. The different preservation conditions at the four sites were supported by the differences in two degradation indicators; the ratio of pheopigment-a to chlorophyll-a and total carotenoids to total pigments. Class-specific carotenoid pigments represented the dominant algal groups reported from each site, however, no distinct down-core changes in the pigment composition were observed at any of the four sites. This indicated that changes in plankton community structure on the group level have been limited over this time period or masked by low preservation of pigments.  相似文献   

Wave interaction with a submarine pipeline in clayey soil due to random waves     

A. Vijaya kumar  S. Neelamani 《Ocean Engineering》2005,32(13):1517-1538

The wave pressure and uplift force due to random waves on a submarine pipeline (resting on bed, partially buried and fully buried) in clayey soil are measured. The influence of various parameters viz., wave period, wave height, water depth, burial depth and consistency index of the soil on wave pressures around and uplift force on the submarine pipeline was investigated. The wave pressures were measured at three locations around the submarine pipeline (each at 120° to the adjacent one). It is found that the wave pressure and uplift force spectrum at high consistency index of the soil is smaller compared to that of low consistency index. Just burying the pipeline (e/D=1.0) in clayey soil reduces the uplift force to less than 60% of the force experienced by a pipeline resting on the seabed (e/D=0.0) for I_c=0.33.  相似文献