Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Oceans

Discipline
Institution
Publication Year
Publication
Publication Type

Articles 841 - 870 of 2515

Full-Text Articles in Entire DC Network

The Effects Of Seagrass Patch Size And Energy Regime On Growth Of A Suspension-Feeding Bivalve, E. A. Irlandi Jan 1996

The Effects Of Seagrass Patch Size And Energy Regime On Growth Of A Suspension-Feeding Bivalve, E. A. Irlandi

Journal of Marine Research

An investigation of how the presence of seagrass and seagrass patch size in high- and low-energy environments affected growth of an infaunal bivalve (hard clam, Mercenaria mercenaria) was carried out. Two general size classes of clams were used, mean length ca. 40.0 mm (41.9 mm) and mean length ca. 20.0 mm (22.3 mm and 19.0 mm), to see if growth responses were the same for large- and small-sized clams. Seagrass density, length and species composition as well as sediment characteristics were measured at high- and low-energy sites to determine if changes in seagrass and/or sediment dynamics could explain observed …

Go to article

New Similarity Solutions Of The Thermocline Equations With Vertical Variations Of Diffusion, Simon Hood Jan 1996

New Similarity Solutions Of The Thermocline Equations With Vertical Variations Of Diffusion, Simon Hood

Journal of Marine Research

Three new classes of exact solution of the thermocline equations are obtained through use of an ansatz based method (Clarkson and Kruskal, 1989), which is related to the older Classical Lie Group Method used by Salmon and Hollerbach (1991) to obtain exact solutions. The newer method has not previously been applied to oceanographic problems. Our results are more general than those of Salmon and Hollerbach in two distinct ways: we obtain new classes of solution not obtainable by the older method and, in addition, we determine solutions in which the vertical temperature diffusion profile is an arbitrary function of depth. …

Go to article

The Eastern Boundary Of The Gulf Stream Recirculation, Paul J. Marchese, Arnold L. Gordon Jan 1996

The Eastern Boundary Of The Gulf Stream Recirculation, Paul J. Marchese, Arnold L. Gordon

Journal of Marine Research

A meridionally aligned thermocline front near 60W in the subtropical North Atlantic is revealed by the 1992 Trident data set. The front separates saltier thermocline water to the east from less salty water to the west. The eastern water is subjected to excess evaporation of the subtropics, while the western water is fed by lower salinity Gulf Stream water, which derives water from the wet tropical Atlantic. It is suggested that the front marks the eastern edge of the Gulf Stream recirculation cell, hence refer to it as the recirculation front. The surface layer displays a fan-like T/S scatter above …

Go to article

Biogenic Matter Diagenesis On The Sea Floor: A Comparison Between Two Continental Margin Transects, William M. Berelson, Jim Mcmanus, Kenneth H. Coale, Kenneth S. Johnson, Tammy Kilgore, David Burdige, Cynthia Pilskaln Jan 1996

Biogenic Matter Diagenesis On The Sea Floor: A Comparison Between Two Continental Margin Transects, William M. Berelson, Jim Mcmanus, Kenneth H. Coale, Kenneth S. Johnson, Tammy Kilgore, David Burdige, Cynthia Pilskaln

Journal of Marine Research

Benthic chamber measurements of the reactants and products involved with biogenic matter diagenesis (oxygen, ammonium, nitrate, silicate, phosphate, TCO2, alkalinity) were used to define fluxes of these solutes into and out of the sediments off southern and central California. Onshore to offshore transects indicate many similarities in benthic fluxes between these regions. The pattern of benthic organic carbon oxidation as a function of water depth, combined with published sediment trap records, suggest that the supply of organic carbon from vertical rain can just meet the sedimentary carbon oxidation + burial demand for the central California region between the …

Go to article

The Effects Of Differential Vertical Diffusion Of T And S In A Box Model Of Thermohaline Circulation, Ann E. Gargett, Bruno Ferron Jan 1996

The Effects Of Differential Vertical Diffusion Of T And S In A Box Model Of Thermohaline Circulation, Ann E. Gargett, Bruno Ferron

Journal of Marine Research

A diffusive box model, consistent with geostrophy, is proposed as an alternative to more usual advective box models of the ocean thermohaline circulation. When vertical diffusion coefficients for T and S are taken as identically equal (the normal assumption in all numerical ocean models to date), the diffusive box model exhibits both steady-state modes and time-dependent behaviors which are essentially indistinguishable from those of an advective model, under both fixed flux and mixed (T restoring) boundary conditions. The thermohaline “circulation” of the diffusive box model, however, is a combination of a convective branch and a vertical diffusive branch, involving …

Go to article

Size-Dependent, Small-Scale Dispersion Of The Capitellid Polychaete, Mediomastus Ambiseta, Jeffrey Ellis Hughes Jan 1996

Size-Dependent, Small-Scale Dispersion Of The Capitellid Polychaete, Mediomastus Ambiseta, Jeffrey Ellis Hughes

Journal of Marine Research

Small(≈cm)-scale spatial pattern of an abundant capitellid polychaete, Mediomastus ambiseta Hartman, was investigated in sediments of central Narragansett Bay, Rhode Island, USA from fall 1988 through spring 1992. Spatial autocorrelation techniques revealed a trend of decreasing patchiness and intensity of aggregation with increasing body size of M. ambiseta during the primary period of settlement and population growth (late summer-fall). The distribution and quality of particulate organic matter may explain the observed size-dependent spatial pattern. M. ambiseta influenced the small-scale distribution and concentration of organic matter and bacteria in surficial sediment. Experiments and field studies showed that this species creates two …

Go to article

Sedimentation Of Phytoplankton During A Diatom Bloom: Rates And Mechanisms, Thomas Kiorboe, Jorgen L. S. Hansen, Alice L. Alldredge, George A. Jackson, Uta Passow, Hans G. Dam, David T. Drapeau, Anya Waite, Carlos M. Garcia Jan 1996

Sedimentation Of Phytoplankton During A Diatom Bloom: Rates And Mechanisms, Thomas Kiorboe, Jorgen L. S. Hansen, Alice L. Alldredge, George A. Jackson, Uta Passow, Hans G. Dam, David T. Drapeau, Anya Waite, Carlos M. Garcia

Journal of Marine Research

Phytoplankton blooms are uncoupled from grazing and are normally terminated by sedimentation. There are several potential mechanisms by which phytoplankton cells may settle out of the photic zone: sinking of individual cells or chains, coagulation of cells into aggregates with high settling velocities, settling of cells attached to marine snow aggregates formed from discarded larvacean houses or pteropod feeding webs, and packaging of cells into rapidly falling zooplankton fecal pellets. We quantified the relative significance of these different mechanisms during a diatom bloom in a temperate fjord, and evaluated their potential to control phytoplankton population dynamics. Overall specific sedimentation rates …

Go to article

A Key Role For Iron-Bound Phosphorus In Authigenic Apatite Formation In North Atlantic Continental Platform Sediments, Caroline P. Slomp, Eric H. G. Epping, Willem Helder, Wim Van Raaphorst Jan 1996

A Key Role For Iron-Bound Phosphorus In Authigenic Apatite Formation In North Atlantic Continental Platform Sediments, Caroline P. Slomp, Eric H. G. Epping, Willem Helder, Wim Van Raaphorst

Journal of Marine Research

A combination of pore water and solid phase analysis was used to determine whether authigenic carbonate fluorapatite (CFA) is currently forming in the sediment at two locations (OMEX I and II) on the North Atlantic continental platform Goban Spur (southwest of Ireland). Results of selective P extractions suggest that an early diagenetic redistribution of Fe-bound P to an authigenic P phase may be occurring at both stations. A steady-state diagenetic model describing the depth profiles of pore water HPO42− and three solid phase forms of P (organic P, Fe-bound P and authigenic P) was developed and applied to …

Go to article

Modeling 210pb-Derived Mixing Activity In Ocean Margin Sediments: Diffusive Versus Nonlocal Mixing, Karline Soetaert, Peter M. J. Herman, Jack J. Middelburg, C. Heip, Henko S. Destigter, Tjeerd C. E. Van Weering, E. Epping, W. Helder Jan 1996

Modeling 210pb-Derived Mixing Activity In Ocean Margin Sediments: Diffusive Versus Nonlocal Mixing, Karline Soetaert, Peter M. J. Herman, Jack J. Middelburg, C. Heip, Henko S. Destigter, Tjeerd C. E. Van Weering, E. Epping, W. Helder

Journal of Marine Research

The influence of sediment mixing on activity versus depth profiles of the radionuclide 210Pb in the upper 20 cm of the sediments has been investigated along a depth transect (208 m-4500 m, 17 stations) in the OMEX study area (Goban Spur, NE Atlantic Ocean). A hierarchical family of bioturbation/nonlocal exchange models was derived. Each member of the hierarchy includes all processes of the previous model, and adds a one- or two-parameter process. The significance of the additional parameters is tested using a one-tailed F-test. It was found that (1) in five cases there is a significant improvement when …

Go to article

A Wave-Induced Stirring Mechanism In The Mid-Depth Equatorial Ocean, Xianjin Li, Ping Chang, R. C. Pacanowski Jan 1996

A Wave-Induced Stirring Mechanism In The Mid-Depth Equatorial Ocean, Xianjin Li, Ping Chang, R. C. Pacanowski

Journal of Marine Research

A wave-induced stirring and transport mechanism for the mid-depth equatorial ocean is proposed and examined using both analytic linear equatorial wave solutions and a fully nonlinear reduced-gravity model. The study of kinematic stirring using the linear solutions suggests that a superimposition of a few simple equatorial waves can lead to strong Lagrangian stirring and transport along the equator. In particular, a combination of an annual long Rossby wave and a high-frequency Yanai wave appears to be most effective in producing strong stirring in the interior equatorial region. Further investigations of stirring properties using an inverted, fully nonlinear reduced gravity shallow-water …

Go to article

Spatial Variation In Short-Term (234th) Sediment Bioturbation Intensity Along An Organic-Carbon Gradient, Robert A. Wheatcroft, William R. Martin Jan 1996

Spatial Variation In Short-Term (234th) Sediment Bioturbation Intensity Along An Organic-Carbon Gradient, Robert A. Wheatcroft, William R. Martin

Journal of Marine Research

Natural and human-induced spatial gradients provide a useful vehicle with which to better understand diverse marine processes. On the Palos Verdes margin (S. California), historical and ongoing waste-water discharge has created an along-shelf gradient in organic C and total N, as well as various trace metals and other pollutants (e.g., DDT). To better understand the impact of such pollution on bioturbation and to develop a more general understanding of the controlling factors of sediment bioturbation intensity, a series of stations representing severely, moderately and negligibly impacted sediments was studied. Vertical profiles of the naturally occurring radionuclide, 234Th, as well …

Go to article

Sinking Particle Fluxes From The Euphotic Zone Over The Continental Slope Of An Eastern Boundary Current Region, M. A. Peña, K. L. Denman, J. R. Forbes, S. E. Calvert, R. E. Thomson Jan 1996

Sinking Particle Fluxes From The Euphotic Zone Over The Continental Slope Of An Eastern Boundary Current Region, M. A. Peña, K. L. Denman, J. R. Forbes, S. E. Calvert, R. E. Thomson

Journal of Marine Research

We analyze data from sediment traps and current meters moored at two locations 100 km apart over the Vancouver Island continental slope during the spring and summer of 1990. Time-series of sinking particle fluxes, major biogenic components (biogenic silica, calcium carbonate, and particulate organic carbon and nitrogen), and stable isotopic composition (δ13Corganic and δ15Ntotal) were determined on samples obtained with sequential sediment traps moored at 200–250 m depth. Associated water property data were obtained from CTD/Rosette profiles taken during trap service periods and from current meters positioned in the surface layer and near …

Go to article

Buoyant Discharge On The Inner Continental Shelf: A Frontal Model, Richard W. Garvine Jan 1996

Buoyant Discharge On The Inner Continental Shelf: A Frontal Model, Richard W. Garvine

Journal of Marine Research

A steady state, frontal model of the arrested topographic wave type (Csanady, 1978) is developed for application to buoyant coastal discharge of large-scale and weak stratification, typically found on the inner continental shelf. The across-shore momentum balance is geostrophic, while the alongshore momentum balance includes wind stress and bottom or interfacial friction. The dynamics thus has semi-geostrophic character. No mixing dynamics is present. The model has two major purposes: first, to serve as the vehicle for a process study requiring only moderate computing resources, and second, to inquire into the general consequences of extending the original single-layer model of Csanady …

Go to article

The Flow Field Off Southwest India At 8n During The Southwest Monsoon Of August 1993, Lothar Stramma, Jürgen Fischer, Friedrich Schott Jan 1996

The Flow Field Off Southwest India At 8n During The Southwest Monsoon Of August 1993, Lothar Stramma, Jürgen Fischer, Friedrich Schott

Journal of Marine Research

The flow field off the southwest coast of India at 8N was investigated during RV Sonne cruise 89 in August 1993 by direct velocity observations from shipboard- and lowered-ADCP and geostrophic computations from CTD stations. The upper ocean between 75E and 76°52′E near the South Indian shelf was governed by a northward flow with a subsurface velocity maximum of 25 cm s−1 at about 100 m depth. This flow, organized as a poleward undercurrent hugging the continental slope, is typical for the southwest monsoon season. The northward transport in August 1993 was 4.7 Sv (1 Sverdrup = 106 …

Go to article

A Unified Model For The Generation And Fission Of Internal Tides In A Rotating Ocean, Theo Gerkema Jan 1996

A Unified Model For The Generation And Fission Of Internal Tides In A Rotating Ocean, Theo Gerkema

Journal of Marine Research

A new two-layer model consisting of generalized Boussinesq equations is derived which contains forcing terms due to barotropic tidal flow over large-amplitude bottom topography. These equations can describe both the generation of nonlinear dispersive internal tides and their disintegration into solitary waves. Special attention is paid to the effects of Coriolis dispersion (which is due to the earth's rotation). Numerical solutions based on observed oceanic conditions show convincingly that the earth's rotation can be a decisive factor at mid-latitudes in that it tends to impede the disintegration of the internal tide. Oceanic observations in the Celtic Sea and in Massachusetts …

Go to article

The Principle Of Biological Attraction, Demonstrated By The Bio-Continuum Theory Of Zooplankton Patch Dynamics, Meng Zhou, Mark E. Huntley Jan 1996

The Principle Of Biological Attraction, Demonstrated By The Bio-Continuum Theory Of Zooplankton Patch Dynamics, Meng Zhou, Mark E. Huntley

Journal of Marine Research

A theory of zooplankton and micronekton patch dynamics is developed that expressly includes animal behavior. This represents a departure from traditional models of patch dynamics, which generally treat animals as Lagrangian particles whose distributions are determined solely by processes of advection and diffusion. The “bio-continuum” theory is based on principles of statistical mechanics, and describes animal aggregations in terms of mean motion, random motion, random kinetic energy, distribution and abundance. The forces on an animal aggregation act both upon the aggregation as a whole (external forces) or between individuals (internal forces). We demonstrate here that the internal forces which serve …

Go to article

High-Frequency Baroclinic Wave Motions In An Equatorial Ocean Current And Related Temperature Fluctuations, Hong Ma Jan 1996

High-Frequency Baroclinic Wave Motions In An Equatorial Ocean Current And Related Temperature Fluctuations, Hong Ma

Journal of Marine Research

This paper uses a theoretical model to demonstrate the existence of a group of equatorially trapped, high-frequency (wave-periods shorter than one week), meso-to-small-scale (wave-lengths shorter than 100 km), baroclinic waves which are embedded in a geostrophic current with only vertical shear. Due to their relatively large vertical and meridional velocities, these high-frequency equatorial waves may play an important role in transporting momentum as well as heat energy in the vertical and transequatorial directions.

Go to article

The Dynamics Of North Brazil Current Retroflection Eddies, Hong Ma Jan 1996

The Dynamics Of North Brazil Current Retroflection Eddies, Hong Ma

Journal of Marine Research

This paper applies analytical and numerical methods to study possible causes of the formation and translation of North Brazil Current retroflection eddies. It shows that the dynamic response of the equatorial western boundary of the Atlantic Ocean to either a remote forcing which is represented by an incoming Rossby wave packet that deepens the equatorial thermocline, or to the wind forcing over the tropical Atlantic Ocean can result in northwestward translating eddies up the coast of Brazil. The numerically simulated eddies closely resemble the features of the observed North Brazil Current retroflection eddies. The formation mechanism of these eddies has …

Go to article

On Frontal And Ventilated Models Of The Main Thermocline, Simon Hood, Richard G. Williams Jan 1996

On Frontal And Ventilated Models Of The Main Thermocline, Simon Hood, Richard G. Williams

Journal of Marine Research

A new similarity approach is applied to the thermocline equations in order to examine contrasting frontal and ventilated models of the main thermocline. The method of solution involves reducing the number of independent variables of the controlling partial differential equation, leading to a particular form for the solutions which satisfy appropriate boundary conditions. A frontal model of the thermocline is obtained following the study of Salmon and Hollerbach (1991). When the vertical diffusivity becomes vanishingly small, an interior front in the subtropical gyre appears at the depth where the vertical velocity changes sign. The front separates downwelling warm water in …

Go to article

A Study Of The Omega Equation For Diagnosing Vertical Motions At Ocean Fronts, Jean-Michel Pinot, Joaquin Tintoré, Dong-Ping Wang Jan 1996

A Study Of The Omega Equation For Diagnosing Vertical Motions At Ocean Fronts, Jean-Michel Pinot, Joaquin Tintoré, Dong-Ping Wang

Journal of Marine Research

Estimation of vertical velocity is a key issue for understanding ocean physics and transport of biogeochemical tracers. We examine the accuracy of estimating vertical velocity in fronts with the omega equation. The diagnostic performance of the omega equation is evaluated by using vertical velocities obtained from simulation of frontal instabilities in a primitive equation model as a reference. We use two traditional quasigeostrophic methods in which the flow is either a geostrophic flow computed from density or a nondivergent flow derived from vorticity and also test two new formulations: a quasigeostrophic method using the total flow field and the semigeostrophic …

Go to article

Application Of A Barotropic Model To North Atlantic Synoptic Sea Level Variability, Richard J. Greatbatch, Youyu Lu, Brad De Young Jan 1996

Application Of A Barotropic Model To North Atlantic Synoptic Sea Level Variability, Richard J. Greatbatch, Youyu Lu, Brad De Young

Journal of Marine Research

A barotropic, shallow-water model of the North Atlantic is used to investigate variability in adjusted sea level on time scales of a few days to a few months (by “adjusted,” we mean that the inverse barometer is removed from both the model-computed sea level and the observations). The model has 1/3° × 0.4° resolution in latitude and longitude, respectively, and is forced using atmospheric pressure and wind stress data derived from European Centre for Medium Range Weather Forecasts (ECMWF, 1994) analyses. The model results are compared with coastal tide gauge data. Along the western boundary, from St. John's, Newfoundland, to …

Go to article

Dispersion Of Wind-Induced Inertial Waves By A Barotropic Jet, P. Klein, A. M. Treguier Jan 1995

Dispersion Of Wind-Induced Inertial Waves By A Barotropic Jet, P. Klein, A. M. Treguier

Journal of Marine Research

This note attempts to reinterpret previous results on the dispersion of wind-induced inertial waves by a geostrophic barotropic jet in the ocean. The approach is to consider the jet vorticity influence on the different baroclinic modes using a vertical normal mode expansion. Numerical and analytical analysis of the linear equations shows that vorticity effects on a single baroclinic mode strongly depend on the ratio of its Rossby radius and the length scale of the geostrophic vorticity: trapping of the near-inertial energy occurs when this ratio is small. When this ratio is of order one, inertial waves are almost unaffected by …

Go to article

Refractory Organic Compounds In Polar Waters: Relationship Between Humic Substances And Amino Acids In The Arctic And Antarctic, Ulrike Hubberten, Rubén J. Lara, Gerhard Kattner Jan 1995

Refractory Organic Compounds In Polar Waters: Relationship Between Humic Substances And Amino Acids In The Arctic And Antarctic, Ulrike Hubberten, Rubén J. Lara, Gerhard Kattner

Journal of Marine Research

A synopsis of data on the amino acid compositions of Arctic and Antarctic seawater, XAD-fractions of dissolved organic matter (DOM) and suspended particulate organic material (POM) is presented. Total dissolved amino acids (TDAA) correlated highly significantly with dissolved organic nitrogen (DON), representing about 11% of DON in unfractionated filtered seawater. Average DON values were similar with ca. 3–4 μM N in the Arctic and Antarctic. Differences in amino acid distribution and composition patterns in particulate and dissolved material suggest the selective preservation or utilization of certain amino acids. In POM, glycine, alanine, glutamic acid, aspartic acid and serine made up …

Go to article

Choked Flows And Wind-Driven Interbasin Exchange, Doron Nof Jan 1995

Choked Flows And Wind-Driven Interbasin Exchange, Doron Nof

Journal of Marine Research

The classical question of how much water flows from one ocean to the other via connecting passages is addressed with a nonlinear analytical model. The focus is on gaps that are too broad to be influenced by the so-called “hydraulic control” and yet too narrow to allow free (“unchoked”) flow through them. We consider two rectangular oceanic basins, one containing a light upper layer overlying a slightly heavier deep layer and the other containing only one layer of fluid (whose density is identical to that of the lower fluid in the first basin). The basins are separated by a thin …

Go to article

Benthic Respiration And Nitrogen Release In Buzzards Bay, Massachusetts, Gary T. Banta, Anne E. Giblin, John E. Hobbie, Jane Tucker Jan 1995

Benthic Respiration And Nitrogen Release In Buzzards Bay, Massachusetts, Gary T. Banta, Anne E. Giblin, John E. Hobbie, Jane Tucker

Journal of Marine Research

The decomposition of organic matter and the regeneration of nitrogen in the sediments of Buzzards Bay, Massachusetts were examined by measuring benthic fluxes of oxygen and dissolved inorganic nitrogen (DIN). Benthic respiration (O2 consumption) rates measured from one site yielded an estimate of 65–80 g C m−2 oxidized annually. Comparing the annual release of DIN with the consumption of O2 led to an estimate of N loss from the benthic-pelagic system, most likely as N2 gas via denitrification, corresponding to 14–32% of the N remineralized from organic matter decomposition. Using path analysis, benthic flux rates of …

Go to article

Observations Of The Influence Of Diurnal Convection On Upper Ocean Dissolved Gas Measurements, Craig L. Mcneil, David M. Farmer Jan 1995

Observations Of The Influence Of Diurnal Convection On Upper Ocean Dissolved Gas Measurements, Craig L. Mcneil, David M. Farmer

Journal of Marine Research

An important example of the interaction between biological productivity and near-surface oceanography is the role of nocturnal convection and diurnal restratification in modifying the environment in which photosynthetic activity takes place. In situ time series measurements of dissolved oxygen reveal the effects of photosynthetic activity, respiration and redistribution by mixing. Moored thermistor time series and frequent CTD casts show that restratification during the day is confined to a warmer shallow surface layer where most of the biological production is expected to occur. The depth and rate of mixing is measured with neutrally buoyant floats which track the vertical excursions of …

Go to article

Vorticity Balance Of Boundary Currents, G. T. Csanady, J. L. Pelegri Jan 1995

Vorticity Balance Of Boundary Currents, G. T. Csanady, J. L. Pelegri

Journal of Marine Research

Friction at the seafloor acts as a source of potential vorticity (PV) for individual isopycnic layers of a boundary current. The rate of PV transport (flux times layer thickness) equals, to a good approximation, the divergence of alongstream shear stress in the bottom boundary layer at the seafloor, which in turn equals the alongstream gradient of Montgomery potential. Mean PV transport is continuous along isopycnals between the bottom boundary layer and a boundary current in statistically steady state. Within the boundary current, Reynolds flux of vorticity transports PV. The divergence of this transport balances planetary vorticity advection and other terms …

Go to article

Local And Remote Forcing Of The Barotropic Transport Through A Periodic Gap In A Basin With Bottom Topography, Alexander Krupitsky Jan 1995

Local And Remote Forcing Of The Barotropic Transport Through A Periodic Gap In A Basin With Bottom Topography, Alexander Krupitsky

Journal of Marine Research

The effect of bottom topography H on the barotropic transport through a periodic gap in a basin with large-scale bottom topography is studied. The results obtained generalize previous findings for the case of a zonal channel (Wang and Huang, 1995; Krupitsky and Cane, 1994). An asymptotic approximation is found for the zonal transport on a β-plane when all f/H isolines are blocked by the solid boundaries. It is shown that to leading order, the transport through the gap (i) is independent of friction similar to a western boundary current; (ii) is inversely proportional to R, the range of values …

Go to article

Coastal Sea Surface Temperature Variability Along The South Coast Of South Africa And The Relationship To Regional And Global Climate, E. H. Schumann, A. L. Cohen, M. R. Jury Jan 1995

Coastal Sea Surface Temperature Variability Along The South Coast Of South Africa And The Relationship To Regional And Global Climate, E. H. Schumann, A. L. Cohen, M. R. Jury

Journal of Marine Research

The southern coastline of South Africa is approximately zonal, with a wide (up to 270 km) shelf region. Intense thermoclines are known to be established by insolation on the inner shelf region during summer, upwelling is generated by easterly-component winds, and occasionally Agulhas Current water can be advected close to the coast, particularly in the east. These processes induce daily and seasonal fluctuations of coastal sea-surface temperature (SST), but their influence over longer time scales (interannual) has not yet been tested. Here time series of SST ranging from 12 to 31 years are examined for inter-relationships with local and regional …

Go to article

Estimates Of Turbulence Parameters From Lagrangian Data Using A Stochastic Particle Model, Annalisa Griffa, Kenneth Owens, Leonid Piterbarg, Boris Rozovskii Jan 1995

Estimates Of Turbulence Parameters From Lagrangian Data Using A Stochastic Particle Model, Annalisa Griffa, Kenneth Owens, Leonid Piterbarg, Boris Rozovskii

Journal of Marine Research

A new parametric approach for the study of Lagrangian data is presented. It provides parameter estimates for velocity and transport components and is based on a stochastic model for single particle motion. The main advantage of this approach is that it provides more accurate parameter estimates than existing methods by using the a-priori knowledge of the model. Also, it provides a complete error analysis of the estimates and is valid in presence of observation errors. Unlike nonparametric methods (e.g. Davis, 1991b), our technique depends on a-priori assumptions which require that the model validity be checked in order to obtain reliable …

Go to article

First Prev Next Last