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Articles 1501 - 1530 of 2567
Full-Text Articles in Entire DC Network
Seasonal Variation In Meridional Overturning And Poleward Heat Transport In The Atlantic And Pacific Oceans: A Model Study, Kirk Bryan
Journal of Marine Research
Numerical solutions for a model of the World Ocean are analyzed to illustrate the important changes in the meridional circulation of the ocean induced by seasonal changes in wind stress. Seasonal variations of meridional circulation and associated changes in poleward heat transport predicted by the model are most important in the Pacific where the background thermohaline circulation is relatively weak....
A Preliminary Comparison Of Selected Numerical Eddy-Resolving General Circulation Experiments With Observations, William J. Schmitz Jr., William R. Holland
A Preliminary Comparison Of Selected Numerical Eddy-Resolving General Circulation Experiments With Observations, William J. Schmitz Jr., William R. Holland
Journal of Marine Research
Results from several numerical experiments based on one class of eddy-resolving gyre-scale models have been compared kinematically with observations. The model oceans are forced by a simplified steady wind stress distribution in basins with idealized coastlines and bottom topography....
On The Dynamics Of Equatorial Outflows With Application To The Amazon's Basin, Doron Nof
On The Dynamics Of Equatorial Outflows With Application To The Amazon's Basin, Doron Nof
Journal of Marine Research
A simplified model is considered in order to describe the dynamics of outflows of rivers or sea straits located at or near the equator. The model is steady, frictionless aod nondiffusive but the motions are not constrained to be quasigeostrophic. The geometry of the oceanic basin into which the outflow debouches is approximated by a wedge and the vertical structure of the flow is represented by two layers of different densities. Approximate solutions to the potential vorticity equation and the Bernoulli integral are obtained analytically....
Dynamic Topography Of The Sea Surface In The Equatorial Atlantic, Eli Joel Katz
Dynamic Topography Of The Sea Surface In The Equatorial Atlantic, Eli Joel Katz
Journal of Marine Research
From historic meridional sections of the central equatorial Atlantic it is shown that the dynamic sea surface topography varies extensively during the year….
Phosphorus-Cadmium Cycling In Northeast Pacific Waters, George A. Knauer, John H. Martin
Phosphorus-Cadmium Cycling In Northeast Pacific Waters, George A. Knauer, John H. Martin
Journal of Marine Research
The vertical distributions of dissolved and particulate Cd and PO4 were determined in water samples collected off the central California coast. The same elements, plus carbon, were also measured in passively sinking particulates that were caught in particle interceptor traps set at depths of 35, 65, 150, 500, 750, and 1500 m....
Dispersion, Feeding Behavior And Competition In Two Spionid Polychaetes, Lisa Ann Levin
Dispersion, Feeding Behavior And Competition In Two Spionid Polychaetes, Lisa Ann Levin
Journal of Marine Research
Spatial analysis, laboratory and field experiments, and feeding observations indicate contrasting patterns of aggression in the polychaetes Pseudopolydora paucibranchiata (Okuda) and Streblospio benedicti (Webster) and provide the first evidence of territoriality in a spionid polychaete (Pseudopolydora)....
15n Tracer Studies Of The Primary Nitrite Maximum, Robert J. Olson
15n Tracer Studies Of The Primary Nitrite Maximum, Robert J. Olson
Journal of Marine Research
15N tracers were used in sub-tropical and Antarctic waters to study the production of nitrite from nitrate and ammonia, and the uptake of nitrate and ammonia. It was found that ammonia was the predominant source of nitrite in the primary nitrite maximum in sub-tropical waters and in the Ross Sea in summer, while nitrate and ammonia were both important in the Scotia Sea in early spring....
Differential Photoinhibition Of Marine Nitrifying Bacteria: A Possible Mechanism For The Formation Of The Primary Nitrite Maximum, Robert J. Olson
Differential Photoinhibition Of Marine Nitrifying Bacteria: A Possible Mechanism For The Formation Of The Primary Nitrite Maximum, Robert J. Olson
Journal of Marine Research
15N-tracer experiments using natural populations of marine nitrifying bacteria revealed photoinhibition of nitrite- and ammonia-oxidizing activity at light intensities less than 1% of sunlight. Nitrite oxidation was more sensitive to light than was ammonia oxidation. Calculations of biologically effective dose rates suggest that the depths at which ammonia oxidation exceeds nitrite oxidation are consistent with the depths of observed primary nitrite maxima in subtropical waters.
Variability Of The Flow Through The Strait Of Belle Isle, Christopher Garrett, Bechara Toulany
Variability Of The Flow Through The Strait Of Belle Isle, Christopher Garrett, Bechara Toulany
Journal of Marine Research
For periods between about two days and one month the surface flow through the Strait of Belle Isle, represented by the sea level difference across it, is highly coherent with the large scale atmospheric pressure gradient normal to the strait. This suggests that the flow is driven by a sea level difference between opposite ends of the strait induced by large scale winds....
Baroclinic Transport In The Gulf Of Alaska Part Ii. A Fresh Water Driven Coastal Current, Thomas C. Royer
Baroclinic Transport In The Gulf Of Alaska Part Ii. A Fresh Water Driven Coastal Current, Thomas C. Royer
Journal of Marine Research
A coastal geostrophic, baroclinic jet in the Gulf of Alaska is driven seasonally by fresh water discharge and winds. The narrow current (<20 km) has a mean transport of 0.24 × 106 m3 s-1 (relative to 100 db) and velocities in excess of 66 cm s-1. The jet reaches a maximum in autumn, coincident with maximum fresh water discharge along the coast....
Spatial And Temporal Patterns Of Dissolved Ammonium, Manganese, And Silica Fluxes From Bottom Sediments Of Long Island Sound, U.S.A., Robert C. Aller, Larry K. Benninger
Spatial And Temporal Patterns Of Dissolved Ammonium, Manganese, And Silica Fluxes From Bottom Sediments Of Long Island Sound, U.S.A., Robert C. Aller, Larry K. Benninger
Journal of Marine Research
The flux of dissolved NH4+, Mn++, and Si(OH)4 from bottom sediments was measured directly at 14 stations throughout central and western Long Island Sound, U.S.A….
Do Oceanic Zooplankton Aggregate At, Or Near, The Deep Chlorophyll Maximum?, Alan R. Longhurst, Alex W. Herman
Do Oceanic Zooplankton Aggregate At, Or Near, The Deep Chlorophyll Maximum?, Alan R. Longhurst, Alex W. Herman
Journal of Marine Research
Grazing pressure, varying with depth, must play a role in shaping the general form of the chlorophyll profile which often contains a deep chlorophyll maximum (DCM). Until we obtain enough coincident high-precision profiles of chlorophyll and grazing plankton (such as the BATFISH profiles, discussed below) it is difficult to be sure that this is so, though the problem is important enough to warrant an attempt, and several have been made....
Cupric Ion Activity And The Growth Of Phytoplankton Clones Isolated From Different Marine Environments, Jerome Gavis, Robert R.L. Guillard, Bonnie L. Woodward
Cupric Ion Activity And The Growth Of Phytoplankton Clones Isolated From Different Marine Environments, Jerome Gavis, Robert R.L. Guillard, Bonnie L. Woodward
Journal of Marine Research
The responses to {Cu++} (free cupric ion activity) of 24 clones of 11 species of marine phytoplankton in 4 algal classes were studied in a Cu-Tris buffered medium with a fluorometric method of measuring acclimated growth rates….
Oceanic Co2 Increase In Baffin Bay, E. P. Jones, E. M. Levy
Oceanic Co2 Increase In Baffin Bay, E. P. Jones, E. M. Levy
Journal of Marine Research
Measurements of the total inorganic carbon in the water of Baffin Bay are interpreted to reflect increases in atmospheric carbon dioxide due to fossil fuel combustion. The increases are indicated by differences at various depths in the alkalinity and total inorganic carbon values after correction for calcium carbonate dissolution and decay of organic matter. These differences are comparable to the changes reported for GEOSECS Atlantic and Pacific Stations.
Sediment Destabilization By Animal Tubes, James E. Eckman, Arthur R.M. Nowell, Peter A. Jumars
Sediment Destabilization By Animal Tubes, James E. Eckman, Arthur R.M. Nowell, Peter A. Jumars
Journal of Marine Research
Laboratory flume ex periments we re conducted in order to test the influence on sediment e rodibility of varying densities of the tube-building polychaete worm Owenia fusiformis. Experiments were performed on isolated individuals, in order to measure approximate spatial limits of isolated tube effects, and on arrays of individuals at densities reported previously to be associated with stable beds....
Nutrition And Food Limitation Of Deposit-Feeders. I. The Role Of Microbes In The Growth Of Mod Snails (Hydrobiidae), Jeffrey S. Levinton, Thomas S. Bianchi
Nutrition And Food Limitation Of Deposit-Feeders. I. The Role Of Microbes In The Growth Of Mod Snails (Hydrobiidae), Jeffrey S. Levinton, Thomas S. Bianchi
Journal of Marine Research
A series of laboratory microcosm experiments demonstrate that somatic growth of the deposit-feeding gastropod, Hydrobia totteni, is related strongly to microalgal standing stock. Microalgal standing stock is, in turn, determined by the relative rates of grazing and recovery....
Phytoplankton Growth In Nutrient Rich Seawater: Importance Of Copper-Manganese Cellular Interactions, William G. Sunda, Richard T. Barber, Susan A. Huntsman
Phytoplankton Growth In Nutrient Rich Seawater: Importance Of Copper-Manganese Cellular Interactions, William G. Sunda, Richard T. Barber, Susan A. Huntsman
Journal of Marine Research
Matrix experiments were conducted to determine the role of trace metals in limiting phytoplankton growth rate in seawater collected from the deep nitrate maximum (800 m, 25 µM nitrate) off the North Carolina coast. Additions of FeCI3, MnCI2, and chelators (EDTA and NTA) stimulated the growth of unialgal cultures of Chaetoceros socialis or of a natural phytoplankton community inoculated into this seawater....
Physical Origins Of Georges Bank Water, T. S. Hopkins, N. Garfield Iii
Physical Origins Of Georges Bank Water, T. S. Hopkins, N. Garfield Iii
Journal of Marine Research
The seasonal behavior of the Georges Bank Water mass is described from the context of the historic National Oceanographic Data Center file (1910-1978). The Georges Bank Water is defined as the water type most commonly found in the top 40 m of water within the 65 m isobath. Plots of its distribution show it unique within the Georges Bank/Gulf of Maine region....
Nutrition And Food Limitation Of Deposit-Feeders. Ii. Differential Effects Of Hydrobia Totteni And Ilyanassa Obsoleta On The Microbial Community, Thomas S. Bianchi, Jeffrey S. Levinton
Nutrition And Food Limitation Of Deposit-Feeders. Ii. Differential Effects Of Hydrobia Totteni And Ilyanassa Obsoleta On The Microbial Community, Thomas S. Bianchi, Jeffrey S. Levinton
Journal of Marine Research
We examined the effects of the mud snails Hydrobia totteni and Ilyanassa obsoleta on microbial communities of sediments in microcosms. Varying density of Hydrobia, and the presence of Ilyanassa, exerted no effect on steady state bacterial standing stock. This is probably related to the rapid recovery rate of bacteria, despite efficient grazing....
Simulation Of A Storm Event In Marine Microcosms, Candance A. Oviatt, Carlton D. Hunt, Gabriel A. Vargo, Kevin W. Kopchynski
Simulation Of A Storm Event In Marine Microcosms, Candance A. Oviatt, Carlton D. Hunt, Gabriel A. Vargo, Kevin W. Kopchynski
Journal of Marine Research
A storm of moderate intensity and lasting for 14 hours was simulated in three of the Marine Ecosystems Research Laboratory (MERL) microcosms by increasing the intensity of microcosm mixing. The simulation resuspended ~0.3 cm of sediment and increased suspended particulate loads by 2 orders of magnitude. Concurrently, the concentrations of metals and nutrients increased in the water column....
The Response Of A Linear Baroclinic Equatorial Ocean To Periodic Forcing, Mark A. Cane, E. S. Sarachik
The Response Of A Linear Baroclinic Equatorial Ocean To Periodic Forcing, Mark A. Cane, E. S. Sarachik
Journal of Marine Research
This paper examines the response of the linear inviscid shallow water equations on a meridionally infinite but zonally bounded equatorial β-plane to periodic zonal forcings at a low frequency ω….
Forced Standing Equatorial Ocean Wave Modes, Peter R. Gent
Forced Standing Equatorial Ocean Wave Modes, Peter R. Gent
Journal of Marine Research
Standing equatorial wave modes are shown to be exact solutions of the forced, linear, inviscid shallow water equations when the forcing is zonally uniform and at a single frequency. If the forcing is equatorially confined in the meridional direction, then so is the directly forced response and the standing mode does not lealr. energy away from the equator....
Evidence For Wind-Forced Circulation In The Gulf Of Mexico, John Blaha, Wilton Sturges
Evidence For Wind-Forced Circulation In The Gulf Of Mexico, John Blaha, Wilton Sturges
Journal of Marine Research
A study is conducted into the response of sea level and dynamic height to fluctuations of alongshore wind stress and wind stress curl at periods greater than a few months per cycle….
Geomorphology And Community Composition Of Two Adjacent Reef Areas, Discovery Bay, Jamaica, W. David Liddell, Sharon L. Ohlhorst
Geomorphology And Community Composition Of Two Adjacent Reef Areas, Discovery Bay, Jamaica, W. David Liddell, Sharon L. Ohlhorst
Journal of Marine Research
The north coast of Jamaica possesses a highly variable topography which reflects tectonic displacement of Pleistocene rock units. Holocene reef development is intimately related to the underlying Pleistocene rocks and reflects such variation in basement morphology. Underwater surveys have established that two adjacent reef areas, the East and West Fore Reefs at Discovery Bay, Jamaica, exhibit contrasting bottom profiles which are due to differential offset of the underlying Pleistocene shelf carbonates....
Disturbance And Community Structure: An Experimental Study Of Bioturbation In Marine Soft-Bottom Environments, G. A. Brenchley
Disturbance And Community Structure: An Experimental Study Of Bioturbation In Marine Soft-Bottom Environments, G. A. Brenchley
Journal of Marine Research
Bioturbators alter the sediment surface in the following ways: by depositing sediment on the surface in the form of feces or in the process of tunnelling, and by transporting sediment about the surface while feeding or while burrowing….
Grazing By Diadema Antillarum (Philippi) And Its Effects On The Benthic Algal Community, Robert C. Carpenter
Grazing By Diadema Antillarum (Philippi) And Its Effects On The Benthic Algal Community, Robert C. Carpenter
Journal of Marine Research
Field observations in St. Croix, U.S. Virgin Islands and Discovery Bay, Jamaica reveal that Diadema antillarum Philippi has a strong feeding preference for algal turf. Seasonally reduced abundance of this preferred food item was accompanied by the utilization of an alternate food resource (live coral) in concurrence with optimal foraging theory predictions....
The Influence Of The Mid-Atlantic Ridge Upon The Circulation And The Properties Of The Mediterranean Water Southwest Of The Azores, Terrence M. Joyce
The Influence Of The Mid-Atlantic Ridge Upon The Circulation And The Properties Of The Mediterranean Water Southwest Of The Azores, Terrence M. Joyce
Journal of Marine Research
The warm, salty water influenced by the Mediterranean outflow can be observed at middepth throughout the Central North Atlantic Ocean. Katz (1970) first noted that rather than a gradual salinity decrease away from the source, large changes were observable over major topographic features such as the mid-Atlantic Ridge, despite the fact that the topography presented no direct physical barrier to the core layer....
Temporal Variations In Diatom Abundance Off Southern California In Relation To Surface Temperature, Air Temperature And Sea Level, Sargun A. Tont
Temporal Variations In Diatom Abundance Off Southern California In Relation To Surface Temperature, Air Temperature And Sea Level, Sargun A. Tont
Journal of Marine Research
Temporal variations in diatom abundance off the southern California coast during the 1920- 1939 period can be explained by a combination of the changes in the circulation patterns of major water masses and variations associated with upwelling events. Monthly, tri-monthly, seasonal and yearly anomalies of diatom abundances have significant negative correlation with the anomalies of sea surface temperature, air temperature and sea level.
Benthic Enrichment In The Georgia Bight Related To Gulf Stream Intrusions And Estuarine Outwelling, R. B. Hanson, K. R. Tenore, S. Bishop, C. Chamberlain, M. M. Pamatmat, J. Tietjen
Benthic Enrichment In The Georgia Bight Related To Gulf Stream Intrusions And Estuarine Outwelling, R. B. Hanson, K. R. Tenore, S. Bishop, C. Chamberlain, M. M. Pamatmat, J. Tietjen
Journal of Marine Research
The distribution patterns of benthic biomass (microbiota, meiofauna, and macrofauna) over the expansive continental shelf of the Georgia Bight suggest nutrient inputs from intrusions of deep Gulf Stream waters at the shelf break….
Log-Normal Distributions Of Suspended Particles In The Open Ocean, Claude E. Lambert, C. Jehanno, N. Silverberg, J. C. Brun-Cottan, R. Chesselet
Log-Normal Distributions Of Suspended Particles In The Open Ocean, Claude E. Lambert, C. Jehanno, N. Silverberg, J. C. Brun-Cottan, R. Chesselet
Journal of Marine Research
A scanning electron microscope-electron microprobe technique was used to chemically distinguish and size particles as fine as 0.2/µm on GEOSECS suspended matter filters from the open ocean….