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Articles 1411 - 1440 of 2567
Full-Text Articles in Entire DC Network
Daily Patterns Of Fluorescence In Vivo In The Central Equatorial Pacific, Patrick J. Setser, Norman L. Guinasso Jr., David R. Schink
Daily Patterns Of Fluorescence In Vivo In The Central Equatorial Pacific, Patrick J. Setser, Norman L. Guinasso Jr., David R. Schink
Journal of Marine Research
A daily cycle of fluorescence in vivo was strikingly apparent in surface waters of the central equatorial Pacific between latitudes 4N and 10S, but not in waters to the north or south of this zone. These changes in fluorescence did not represent changes in chlorophyll-a concentration, but rather a photoinhibition of fluorescence by ambient light. Higher nutrient and chlorophyll-a concentrations were found in the region where cycling occurred....
Primary Productivity And Chemical Composition Of Marine Snow In Surface Waters Of The Southern California Bight, Alice L. Alldredge, James L. Cox
Primary Productivity And Chemical Composition Of Marine Snow In Surface Waters Of The Southern California Bight, Alice L. Alldredge, James L. Cox
Journal of Marine Research
The primary productivity of flocculent marine snow (fragile and amorphous macroscopic particulates) was measured for the first time using samples collected quantitatively in surface waters of the Southern California Bight….
On The Interaction Between Surface Waves And Undulations On The Seabed, A. G. Davies
On The Interaction Between Surface Waves And Undulations On The Seabed, A. G. Davies
Journal of Marine Research
When surface water waves propagate over undulating seabed topography, the resulting interaction creates a near-bed velocity field which has important implications for sediment transport. Linear perturbation theory is used here to examine this interaction for the case of two-dimensional oscillatory uniplanar nonseparating flow, in which the surface wave crests are parallel to the crests of the bottom undulations....
Three-Dimensional Modeling Of Tracers In The Deep Pacific Ocean Ii. Radiocarbon And The Circulation, Manuel E. Fiadeiro
Three-Dimensional Modeling Of Tracers In The Deep Pacific Ocean Ii. Radiocarbon And The Circulation, Manuel E. Fiadeiro
Journal of Marine Research
The radiocarbon data from the GEOSECS Pacific expedition was used to test the abyssal circulation model presented in part I of this series. The results show that a uniform increase of the upwelling rate from the bottom to the top of the model cannot explain the qualitative features of the radiocarbon distribution....
The Effects Of Bioturbation On The Initiation Of Motion Of Intertidal Sands, W. D. Grant, L. F. Boyer, L. P. Sanford
The Effects Of Bioturbation On The Initiation Of Motion Of Intertidal Sands, W. D. Grant, L. F. Boyer, L. P. Sanford
Journal of Marine Research
The results of laboratory flume experiments on initiation of sediment motion in natural marine sediments (fine sand) are reported. Sediment cores were taken from an intertidal region during all seasons of the year over a four-year period….
Depositional Patterns Of Modem Orinoco/Amazon Muds On The Northern Venezuelan Shelf, John D. Milliman, Jorge Butenko, Jean Paul Barbot, Jan Hedberg
Depositional Patterns Of Modem Orinoco/Amazon Muds On The Northern Venezuelan Shelf, John D. Milliman, Jorge Butenko, Jean Paul Barbot, Jan Hedberg
Journal of Marine Research
Modern muds derived from the Orinoco and Amazon Rivers are gradually covering early Holocene (shallow-water) reefs and sands on the continental shelf and upper slope north of the Paria peninsula. Throughout much of the area the muds are more or less continuous and locally as thick as 20 m....
Spacial Distributions Of Major Phytoplankton Community Components In Narragansett Bay At The Peak Of The Winter-Spring Bloom, Franklin H. Farmer, Gabriel A. Vargo, Clarence A. Brown Jr., Olin Jarrett Jr.
Spacial Distributions Of Major Phytoplankton Community Components In Narragansett Bay At The Peak Of The Winter-Spring Bloom, Franklin H. Farmer, Gabriel A. Vargo, Clarence A. Brown Jr., Olin Jarrett Jr.
Journal of Marine Research
The horizontal distribution of phytoplankton in western Narragansett Bay at the height of the 1978 winter-spring bloom was characterized using data from an airborne fluorosensor to extend in situ point measurements of chlorophyll a and phytoplankton population composition to linear or area coverage....
Sediment Disturbance And The Spatial Distributions Of Shallow Water Meiobenthic Nematodes On The Open Oregon Coast, E. W. Hogue
Sediment Disturbance And The Spatial Distributions Of Shallow Water Meiobenthic Nematodes On The Open Oregon Coast, E. W. Hogue
Journal of Marine Research
The relationship between spatial distributions of meiobenthic nematodes and wave generated sediment disturbance was investigated within a 3.3 km2 area on the central Oregon coast. Six stations between 18 and 32 m depth were sampled during the summer of 1979. Two distinct fauna! groups were associated with different water depths....
An Analysis Of The Production-Regeneration System In The Coastal Upwelling Area Off N.W. Africa Based On Oxygen, Nitrate And Ammonium Distributions, H. J. Minas, T. T. Packard, M. Minas, B. Coste
An Analysis Of The Production-Regeneration System In The Coastal Upwelling Area Off N.W. Africa Based On Oxygen, Nitrate And Ammonium Distributions, H. J. Minas, T. T. Packard, M. Minas, B. Coste
Journal of Marine Research
Using the hydrographic and nutrient data from the R/V Jean Charcot CINECA-V cruise and Broenkow's (1965) mixing model, we have calculated the biologically induced changes in the oxygen, nitrate and ammonium distribution patterns of the upwelling system off Cape Blanc, N .W. Africa....
Effect Of Pressure On The Partial Equivalent Volume Of Salts In Seawater, Alvin Bradshaw, Karl E. Schleicher
Effect Of Pressure On The Partial Equivalent Volume Of Salts In Seawater, Alvin Bradshaw, Karl E. Schleicher
Journal of Marine Research
The effect of pressure on the partial equivalent volumes of salts of the major ions in 35%, seawater at 10 and 25°C was determined for applied pressures of 400 and 1000 bars from measurements of the change in solution compression with salt concentration....
A Theory Of The Wind-Driven Circulation Ii. Gyres With Western Boundary Layers, William R. Young, Peter B. Rhines
A Theory Of The Wind-Driven Circulation Ii. Gyres With Western Boundary Layers, William R. Young, Peter B. Rhines
Journal of Marine Research
The quasigeostrophic, wind-driven circulation theory given by Rhines and Young (1982b) is extended in two directions. First, we consider forcing patterns which are not contrived so as to close without a western boundary layer. The resulting barotropic circulation pattern (see Fig. 1) has the well known east-west asymmetry produced by the β-effect....
An Evaluation Of Nutrient Sources To Onslow Bay, North Carolina, Larry P. Atkinson, Leonard J. Pietrafesa, Eileen E.G. Hofmann
An Evaluation Of Nutrient Sources To Onslow Bay, North Carolina, Larry P. Atkinson, Leonard J. Pietrafesa, Eileen E.G. Hofmann
Journal of Marine Research
Hydrographic and current meter data from Onslow Bay, North Carolina, were examined to determine the relative importance of various nutrient sources….
Input Of Tritium To Intermediate Depth Water In The South Pacific, J. R. Harries, G. E. Calf
Input Of Tritium To Intermediate Depth Water In The South Pacific, J. R. Harries, G. E. Calf
Journal of Marine Research
Tritium concentrations have been determined for seawater samples collected near the western boundary of the South Pacific. The deepest penetration of tritium, in terms of either depth or isopycnal surface, occurs between latitudes 14 and 30S and the penetration is greater than that observed in the mid-South Pacific during the Geochemical Ocean Sections Study (GEOSECS) cruise....
Too Cold' Bottom Layers At The Base Of The Scotian Rise, Georges L. Weatherly, Edward A. Kelly Jr.
Too Cold' Bottom Layers At The Base Of The Scotian Rise, Georges L. Weatherly, Edward A. Kelly Jr.
Journal of Marine Research
CTD data indicate that the bottom boundary layer in a region of the western North Atlantic near 40N 62W is a distinct body of relatively cold (θ < 1.82°C), fresh (S < 34.894‰) water. This region is a strip ~ 100 km wide aligned approximately along isobaths centered near the 4900 m isobath on the continental margin near its base....
The Flow Of Equatorial Kelvin Waves And The Equatorial Undercurrent Around Islands, P. B. Rowlands
The Flow Of Equatorial Kelvin Waves And The Equatorial Undercurrent Around Islands, P. B. Rowlands
Journal of Marine Research
A linear theory is presented for the flow of equatorial Kelvin waves and of the equatorial undercurrent around islands situated on or near the equator. The island is modelled as an infinitesimally thin meridional barrier. It is shown that small islands affect the flow very little, while large islands effectively block the flow....
The Effect Of Islands On Low Frequency Equatorial Motions, Mark A. Cane, Yves Du Penhoat
The Effect Of Islands On Low Frequency Equatorial Motions, Mark A. Cane, Yves Du Penhoat
Journal of Marine Research
We develop a complete linear theory for the effects of islands on low frequency waves of the kind thought to be important in the seasonal and interannual variations of the equatorial ocean circulation….
A Topographically Controlled Upwelling Center Off Southern Vancouver Island, Howard J. Freeland, Kenneth L. Denman
A Topographically Controlled Upwelling Center Off Southern Vancouver Island, Howard J. Freeland, Kenneth L. Denman
Journal of Marine Research
From January 1979 to June 1981 an oceanographic experiment off the west coast of Canada provided a unique view of a large annual upwelling event. The upwelling is driven by an interaction between the large scale coastal current systems and a narrow canyon that cuts the continental shelf. This interaction allows water to be raised from depths much greater than those normally expected from the classical wind-driven upwelling mechanisms....
Large-Scale Interannual Physical And Biological Interaction In The California Current, Dudley B. Chelton, Patricio A. Bernal, John A. Mcgowan
Large-Scale Interannual Physical And Biological Interaction In The California Current, Dudley B. Chelton, Patricio A. Bernal, John A. Mcgowan
Journal of Marine Research
Thirty years of temperature, salinity, steric height and zooplankton data are examined to explore the potential causes of large-scale biological variability in the California Current. The physical and biological properties are all found to be dominated by a pronounced interannual signal with very large spatial scale....
Enrichment And Association Of Lead And Bacteria At Particulate Surfaces In A Salt-Marsh Surface Layer, R. W. Harvey, L. W. Lion, L. Y. Young, J. O. Leckie
Enrichment And Association Of Lead And Bacteria At Particulate Surfaces In A Salt-Marsh Surface Layer, R. W. Harvey, L. W. Lion, L. Y. Young, J. O. Leckie
Journal of Marine Research
The particle-laden surface layer (~ 150-370 µm) and subsurface waters of a South San Francisco Bay salt marsh were sampled over two tidal cycles and analyzed for particle numbers and particulate-associated and total concentrations of lead and bacteria….
Manganese Cycling In Northeast Pacific Equatorial Waters, John H. Martin, George A. Knauer
Manganese Cycling In Northeast Pacific Equatorial Waters, John H. Martin, George A. Knauer
Journal of Marine Research
Sea water samples collected above, within and below a pronounced oxygen minimum (0-5 µmol liter-1) were analyzed for their Mn content. Amounts of dissolved Mn slowly decreased with depth and little, if any, relationship with oxygen was found. In contrast, suspended particulate Mn values increased markedly at the top of the oxygen minimum....
Plankton Species Assemblages Off Southern Vancouver Island: Geographic Pattern And Temporal Variability, David L. Mackas, Hugh A. Sefton
Plankton Species Assemblages Off Southern Vancouver Island: Geographic Pattern And Temporal Variability, David L. Mackas, Hugh A. Sefton
Journal of Marine Research
Multivariate classification and ordination methods are used to describe the patterns of zooplankton and phytoplankton community composition during four summer-period surveys of the continental shelf region off southern British Columbia….
Geostrophic Equatorial Deep Jets, Charles C. Eriksen
Geostrophic Equatorial Deep Jets, Charles C. Eriksen
Journal of Marine Research
Deep zonal jets in the western Pacific are geostrophic in character at latitudes of a fraction of a degree. This evidence corroborates the interpretation that deep jets very close to the equator take the form of Kelvin waves. Vertical displacements inferred from GEOSECS density profiles in the Pacific and Atlantic suggest deep jets are a general feature of equatorial oceans.
Cooling Processes In Deep, Temperate Lakes: A Review With Examples From Two Lakes In British Columbia, Eddy C. Carmack, David M. Farmer
Cooling Processes In Deep, Temperate Lakes: A Review With Examples From Two Lakes In British Columbia, Eddy C. Carmack, David M. Farmer
Journal of Marine Research
The cooling period in deep, temperate lakes includes the breakdown of the seasonal thermocline, isothermal overturn as the lake cools through 4°C, and winter restratification. The first part of this paper is taken up with a review of the relatively few studies on the seasonal cooling of lakes....
The Thermohaline Driving Mechanism Of Oceanic Jet Streams, G. T. Csanady
The Thermohaline Driving Mechanism Of Oceanic Jet Streams, G. T. Csanady
Journal of Marine Research
Worthington (1972a) advanced the hypothesis that winter cooling of the Gulf Stream south of New England is the cause of the Stream's winter intensification. That loss of buoyancy should result in increased velocity and transport in an oceanic jet stream seems at first paradoxical....
Weddell Deep Water Variability, Arnold L. Gordon
Weddell Deep Water Variability, Arnold L. Gordon
Journal of Marine Research
Temperature of the Weddell Deep Water west of the Greenwich Meridian in 1977 is dramatically lower than that observed in the same region in 1973. The most intense thermal alteration extends from approximately 200 m to 2700 m. Cooling, which averages 0.2°C, accompanies a nearly density compensating salinity decrease, averaging 0.02‰....
On The Determination Of Absolute Velocities In The Ocean, Manuel E. Fiadeiro, George Veronis
On The Determination Of Absolute Velocities In The Ocean, Manuel E. Fiadeiro, George Veronis
Journal of Marine Research
An empirical search procedure based only on hydrographic data and the use of the dynamical method provides a good estimate of the level of no motion. The criterion is to select the level that yields the minimum mean square transport imbalances for the set of carefully chosen independent layers....
A Comparison Of Geostrophic And Measured Velocities In The Equatorial Undercurrent, S. P. Hayes
A Comparison Of Geostrophic And Measured Velocities In The Equatorial Undercurrent, S. P. Hayes
Journal of Marine Research
Profiles of zonal velocity in the upper 500 m at the equator are computed from the differentiated form of the geostrophic relation…
On The Climate Of A Subtropical Ocean Gyre: Decade Timescale Variations In Water Mass Renewal In The Sargasso Sea, William J. Jenkins
On The Climate Of A Subtropical Ocean Gyre: Decade Timescale Variations In Water Mass Renewal In The Sargasso Sea, William J. Jenkins
Journal of Marine Research
A simple concept model of the climatology of a subtropical ocean gyre is developed on the basis of assumed isopycnal transport and latent heat flux. The 27 year record of annually averaged salinities on isopycnals near Bermuda shows clear and systematic variations, and significant (> 95% confidence) correlations with oxygen (positive) and vertical density gradient (negative) support the hypothesis....
Long Range Kelvin Wave Propagation Of Transport Variations In Pacific Ocean Equatorial Currents, R. A. Knox, David Halpern
Long Range Kelvin Wave Propagation Of Transport Variations In Pacific Ocean Equatorial Currents, R. A. Knox, David Halpern
Journal of Marine Research
Two 100 km scale arrays of moored upper ocean current meters, one near 0, 152W, the other near 0, 110W, were used to study the zonal transport of the strong equatorial currents in and above the thermocline. At long periods (several days), fluctuations· in the vertically integrated zonal velocity (transport per unit meridional distance) at a single equatorial mooring were highly correlated with fluctuations in the total transport across the section 0-250 m and 1N-1S, which includes most of the Equatorial Undercurrent....
Observations Of Near-Equatorial Flows In The Eastern Pacific, Ants Leetmaa
Observations Of Near-Equatorial Flows In The Eastern Pacific, Ants Leetmaa
Journal of Marine Research
Direct measurements were made in 1980 and 1981 of the near-equatorial flow field along sections at 110, 102.5, 95, and 85W. The Equatorial Undercurrent weakens as it approaches the Galapagos. Most of the transport is lost from the warmer, upper part of the current....