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Articles 1861 - 1890 of 2527
Full-Text Articles in Entire DC Network
A Sea-Air Interaction Deep-Ocean Buoy, K. L. Warsh, M. Garstang, P. L. Grose
A Sea-Air Interaction Deep-Ocean Buoy, K. L. Warsh, M. Garstang, P. L. Grose
Journal of Marine Research
A stable spar buoy, TRITON, has been developed as a platform for sea-air boundary-layer measurements in the deep ocean. The buoy has operated for 60 days on station in the tropical Atlantic and for seven days in the Gulf of Mexico….
Eddy Friction In The Ocean, John A.T. Bye
Eddy Friction In The Ocean, John A.T. Bye
Journal of Marine Research
The scalar energy spectrum of steady isotropic two-dimensional turbulence is derived for two-dimensional motion in a homogeneous ocean in which the dissipation occurs in a bottom-friction layer. The significant property of the spectrum is a range of wave numbers in which the mean-squared vorticity is conserved and energy is transferred to the friction layer....
Sediment Budget In A Deep-Sea Core From The Central Equatorial Pacific, G. Ross Heath, Theodore C. Moore Jr., B. L.K. Somayajulu, David S. Cronan
Sediment Budget In A Deep-Sea Core From The Central Equatorial Pacific, G. Ross Heath, Theodore C. Moore Jr., B. L.K. Somayajulu, David S. Cronan
Journal of Marine Research
Stratigraphic, mineralogic, chemical, and geochronologic measurements on a core from 8°20'N, 153°W show that sediment has been accumulating at a rate of 160 g/cm2/106 years. Of this, 125 g is "fresh" Quaternary sediment while the remainder is lower and middle Tertiary material eroded from nearby outcrops....
Foraminiferal And Sedimentological Evidence Far Uplift Of The Deep-Sea Floor, Gorda Rise, Northeastern Pacific, Gerald A. Fowler, L. D. Kulm
Foraminiferal And Sedimentological Evidence Far Uplift Of The Deep-Sea Floor, Gorda Rise, Northeastern Pacific, Gerald A. Fowler, L. D. Kulm
Journal of Marine Research
Displaced benthic Foraminifera in semiconsolidated clayey sandstone from the Gorda Rise provide evidence for uplift of the deep-sea floor. The sediment was deposited by turbidity currents on the floor of the Escanaba Trough (the axial valley of the Gorda Rise) from a sublittoral source on the continental margin to the east....
On The Anomalous Deep Water South Of The Aleutian Islands, R. K. Reed
On The Anomalous Deep Water South Of The Aleutian Islands, R. K. Reed
Journal of Marine Research
Several oceanographers have concluded that Pacific deep water enters the North Pacific from the southern hemisphere and is warmed along its northerly path of flow. The deep water near the Aleutian Trench, however, is noticeably colder than the water lying between it and 30°N in the region east of 170°E. Knauss (1962) attributed this condition to the rising of colder water from below; Gordon and Gerard (1970) were unable to find a path of flow into the northern region....
Seawater Alkalinity Determination By The Ph Method, Charles Culberson, R. M. Pytkowicz, J. E. Hawley
Seawater Alkalinity Determination By The Ph Method, Charles Culberson, R. M. Pytkowicz, J. E. Hawley
Journal of Marine Research
The coefficient fH used in the seawater alkalinity method of Anderson and Robinson (1946), has been redetermined at 25°C. We have found that fH = 0.741 ±0,005 for salinities between 30‰ and 41‰….
Fine-Sediment Dispersal In The Gulf Of San Miguel, Western Gulf Of Panama: A Reconnaissance, Donald J.P. Swift, R. Gordon Pirie
Fine-Sediment Dispersal In The Gulf Of San Miguel, Western Gulf Of Panama: A Reconnaissance, Donald J.P. Swift, R. Gordon Pirie
Journal of Marine Research
The Gulf of San Miguel, 30 km wide at its mouth and extending 40 km inland, is the estuary of river systems that drain eastern Panama. The Gulf consists of a central scour channel up to 36 m deep, flanked by semicircular bays. The tide has a range of up to 7 m, and maximum surface tidal currents average 200 cm/sec on the flood tide and 230 cm/sec on the ebb tide....
Circulation In The Amazon River Estuary And Adjacent Atlantic Ocean, Ronald J. Gibbs
Circulation In The Amazon River Estuary And Adjacent Atlantic Ocean, Ronald J. Gibbs
Journal of Marine Research
A preliminary survey of the water circulation in the Amazon estuary and adjacent ocean was conducted during both low-river and high-river dischar ge. Results indicate that, due to the river's large discharge, no salt-water wedge (35‰) enters the Amazon estuary during either low-river or high-river discharge....
The Distribution Of Mesopelagic Fishes In The Equatorial And Western North Atlantic Ocean, Richard H. Backus, James E. Craddock, Richard L. Haedrich, David L. Shores
The Distribution Of Mesopelagic Fishes In The Equatorial And Western North Atlantic Ocean, Richard H. Backus, James E. Craddock, Richard L. Haedrich, David L. Shores
Journal of Marine Research
Examination of about 290 midwater trawl hauls made to a depth of 1000 m in the equatorial and western North Atlantic Ocean from 1961 to 1968 suggests that at least 10 physical boundaries determine the ranges of mesopelagic fishes. The boundaries delimit six pelagic regions----the Slope Water Region, the Northern Sargasso Sea, the Southern Sargasso Sea, the Gulf of Mexico, the Caribbean Sea, and the Amazonian Region----and partly delimit four others----the Eastern Gyre and the Labrador, Lesser Antillean, and Guinean regions....
The Equatorial Undercurrent At 170°E In March And April 1967, Philippe Hisard, Jacques Merle, Bruno Voituriez
The Equatorial Undercurrent At 170°E In March And April 1967, Philippe Hisard, Jacques Merle, Bruno Voituriez
Journal of Marine Research
In 1967 the R. V. CORIOLIS undertook five cruises along the 170°E meridian in order to investigate the relationships between the sea-surface conditions and the occurrence of the Equatorial Undercurrent; this paper deals primarily with the March and April cruises. The Equatorial Undercurrent was observed as a double-cell structure....
The Decay And Stability Of Internal Wave Modes In A Multisheeted Thermocline, Bryan Johns, Michael J. Cross
The Decay And Stability Of Internal Wave Modes In A Multisheeted Thermocline, Bryan Johns, Michael J. Cross
Journal of Marine Research
Internal wave motions are considered in a thermocline that consists of thin sheets across which there are abrupt changes in the density. These sheets are separated by homogeneous layers of water in which there is turbulent mixing. Investigations have been undertaken to determine the dependence of both the rate of energy dissipation and the dynamical stability upon the number of sheets in the thermocline....
Concentrations Of Particulate Iron In Atlantic Open-Ocean Water, Peter R. Betzer, Michael E.Q. Pilson
Concentrations Of Particulate Iron In Atlantic Open-Ocean Water, Peter R. Betzer, Michael E.Q. Pilson
Journal of Marine Research
Measurements of particulate iron concentrations have been carried out on samples from the western Atlantic Ocean and the Caribbean Sea. Water samples were collected in 30-l Niskin bottles; iron analyses were done by atomic absorption spectroscopy. The average of 184 iron determinations on shallow open-ocean water (0-300 m) was 0.177 µg/l; the average of 112 determinations on deep water (500-7535 m) was 0.255 µg/l....
Long Waves Along A Single-Step Topography In A Semi-Infinite Uniformly Rotating Ocean, J. C. Larsen
Long Waves Along A Single-Step Topography In A Semi-Infinite Uniformly Rotating Ocean, J. C. Larsen
Journal of Marine Research
The dispersion equation for Kelvin-type waves for a single-step topography is derived. Solutions for this equation indicate that, in addition to the Kelvin-type waves, there also exist quasigeostrophic waves that are related to the topography structure.
Recent Dissolved-Oxygen Measurements In The Gulf Of Mexico Deep Waters, Worth D. Nowlin Jr., David F. Paskausky, Hugh J. Mclellan
Recent Dissolved-Oxygen Measurements In The Gulf Of Mexico Deep Waters, Worth D. Nowlin Jr., David F. Paskausky, Hugh J. Mclellan
Journal of Marine Research
In 1963 it was suggested that rather large gradients in dissolved oxygen exist in the Gulf of Mexico below a sill depth of between 1500 m and 1900 m. However, measurements made on three cruises during 1966 and 1967 indicate that there is no clearly discernable horizontal variation in dissolved oxygen in these waters....
Acoustic Backscattering From A Wind-Driven Water Surface, R. A. Pruitt, S. W. Marshall, R. R. Goodman
Acoustic Backscattering From A Wind-Driven Water Surface, R. A. Pruitt, S. W. Marshall, R. R. Goodman
Journal of Marine Research
This paper reports an attempt to measure the asymmetry of wind-generated water waves by using acoustical methods. A 40-foot wind-tunnel water flume provided a controlled water surface that was insonified from above at 162 kHz with pulses 30 µsec in duration (5 cycles). The scattered-pressure amplitude pulses were analyzed statistically as a function of the shear stress produced at the water surface by the wind....
The Ekman Vertical Velocity In An Enclosed Β-Plane Ocean, W. Lawrence Gates
The Ekman Vertical Velocity In An Enclosed Β-Plane Ocean, W. Lawrence Gates
Journal of Marine Research
The vertical flux beneath the surface boundary layer is determined by balancing the divergence induced in this layer by the prescribed wind stress and surface temperature with the divergence of an assumed geostrophic interior ftow. In this manner the equilibrium surface height over an enclosed basin is formulated as a boundary-value problem, the solution of which leads directly to the Ekman vertical velocity....
Internal Wave Propagation Normal To A Geostrophic Current, David Healey, Paul H. Leblond
Internal Wave Propagation Normal To A Geostrophic Current, David Healey, Paul H. Leblond
Journal of Marine Research
It is shown that (i) internal gravity waves propagating along a horizontal density gradient in a uniformly rotating ocean can exist for a range of slightly smaller frequencies than is possible in the absence of such a gradient, (ii) such waves exhibit a phase difference from top to bottom, and (iii) they exchange energy with the geostrophic current, which balances the density-induced pressure gradient....
On The Dynamics Of The Florida Current, William J. Schmitz Jr.
On The Dynamics Of The Florida Current, William J. Schmitz Jr.
Journal of Marine Research
This paper contains selected results from the first in a series of new efforts directed toward establishing an observational basis for testing hypotheses on the dynamics of the Florida Current. These efforts are based on the application of a recently developed free-instrument method for the collection of density and velocity field data at several sections across the Current....
The Generation Of Longshore Currents On A Plane Beach, Anthony J. Bowen
The Generation Of Longshore Currents On A Plane Beach, Anthony J. Bowen
Journal of Marine Research
The generation of longshore currents on a beach is investigated theoretically, using the concept of radiation stress to describe the flux of momentum associated with the incoming waves. Outside the surf zone, the longshore gradient of the radiation stress is always zero, and the flow is therefore driven only inside the surf zone....
Some New Observations On The Equilibrium Region Of The Wind-Wave Spectrum, John Garrett
Some New Observations On The Equilibrium Region Of The Wind-Wave Spectrum, John Garrett
Journal of Marine Research
Observations made with an array of wave sensors reveal significant differences between the high-frequency regions of spectra measured on different days. These differences suggest that the idea of a universal equilibrium range may not be strictly true.
Oceanic Flow Over Varying Bottom Topography, R. A. Clarke, N. P. Fofonoff
Oceanic Flow Over Varying Bottom Topography, R. A. Clarke, N. P. Fofonoff
Journal of Marine Research
A study has been made of steady barotropic flows on the β plane over a bottom topography that varies in a direction inclined to the circles of latitude. The solutions obtained, starting with both the Eulerian and the Lagrangian systems of equations, are shown to be identical in the case of flow over a single-depth discontinuity....
Effects Of Friction And Surface Tide Angle Of Incidence On The Coastal Generation Of Internal Tides, J. G. Weigand, H. G. Farmer, S. J. Prinsenberg, Maurice Rattray Jr.
Effects Of Friction And Surface Tide Angle Of Incidence On The Coastal Generation Of Internal Tides, J. G. Weigand, H. G. Farmer, S. J. Prinsenberg, Maurice Rattray Jr.
Journal of Marine Research
For the generation of internal waves by long surface waves, the normal-mode equations and solutions that satisfy the boundary conditions in a two-layer system are found analytically. Frictional effects decrease the amplitude of an internal wave over the shelf, changing it from a standing wave to a wave that progresses coastward and decreases the interference on the amplitude of the offshore progressive wave traveling seaward. Model studies, using a two-layer system of fresh water and saline water in a 9.9-m-long channel, gave favorable results relative to the theoretical results.
Average Velocities Of Some Ocean Currents As Deduced From The Recovery Of Plastic Drift Cards, G. H. Stander, L. V. Shannon, J. A. Campbell
Average Velocities Of Some Ocean Currents As Deduced From The Recovery Of Plastic Drift Cards, G. H. Stander, L. V. Shannon, J. A. Campbell
Journal of Marine Research
Twenty-four drift cards, released in 1964 through 1966 in the vicinity of Cape Town and at various locations in the Atlantic Ocean, have been recovered on the coasts of: North and South America, three islands in the South Atlantic, England, France, Nigeria, and Australia. The travel times indicated by 19 of these cards have been used to estimate the mean velocities of the presumed current systems involved. The rate of card recovery and the long distances traveled by the cards have proved conclusively that the solid polythene drift card is durable.
An Underwater Spectral Irradiance Collector, Raymond C. Smith
An Underwater Spectral Irradiance Collector, Raymond C. Smith
Journal of Marine Research
The design, testing, and evaluation of the accuracy of a collector for measuring underwater spectral irradiance is the subject of this paper. A successful underwater irradiance collector is described. Emphasis is placed on the experimental techniques employed in testing its collecting properties and in measuring the immersion effect so that its accuracy can be estimated....
Naviface, Oxyty, And Epichthon: Words Versus Terms, John Lyman
Naviface, Oxyty, And Epichthon: Words Versus Terms, John Lyman
Journal of Marine Research
The suggestions by R. B. Mongomery (1969) concerning the need for new words in marine research raise in my mind the question of whether in fact it is new words or new terms that are necessary. By coining new words, are we not in danger of surrounding our discipline with a jargon that, while it may facilitate slightly communication among insiders, restricts to a greater extent communication with those in other fields?....
Redefinition Of Salinity, Warren S. Wooster, Arthur J. Lee, Gunter Dietrich
Redefinition Of Salinity, Warren S. Wooster, Arthur J. Lee, Gunter Dietrich
Journal of Marine Research
Two definitions of salinity have been in use since the early part of the present century (Knudsen 1901, Forch et al. 1902). According to the procedural definition, salinity is the amount (in grams) of dissolved solid material in a kilogram of seawater after all the bromine has been replaced by an equivalent quantity of chlorine, after all the carbonate has been converted to oxide, and after all of the organic matter has been destroyed....
The Use Of Moire Fringes In Laboratory Oceanography, D. James Baker Jr.
The Use Of Moire Fringes In Laboratory Oceanography, D. James Baker Jr.
Journal of Marine Research
The purpose of this note is to present a sketch of the inexpensive Moire fringe technique, which provides a quick and easy visualization of concentration gradients and which can be used for quantitative measurements….
Influence Of The Amazon River Outflow On The Ecology Of The Western Tropical Atlantic. Iii. The Planktonic Flora Between The Amazon River And The Windward Island, E. M. Hulburt, Nathaniel Corwin
Influence Of The Amazon River Outflow On The Ecology Of The Western Tropical Atlantic. Iii. The Planktonic Flora Between The Amazon River And The Windward Island, E. M. Hulburt, Nathaniel Corwin
Journal of Marine Research
An abundant diatomaceous flora was observed in shallow waters along the coasts of French Guiana and Dutch Guiana during the fall of 1964 and the spring of 1965. In the fall, these diatoms were apparently carried far beyond the continental shelf by the Amazon effluent, which crossed the northwestward Guiana Current and became entrained in a southeastward countercurrent....
Description Of A Freely Dropped Instrument For Measuring Current Velocity, William S. Richardson, Allan R. Carr, Henry J. White
Description Of A Freely Dropped Instrument For Measuring Current Velocity, William S. Richardson, Allan R. Carr, Henry J. White
Journal of Marine Research
A new form of freely dropped instrument for current-velocity measurements is described. Operational procedures for using the instrument and its auxiliary equipment are given.
Geostrophy And Direct Measurements In The Straits Of Florida, Saul Broida
Geostrophy And Direct Measurements In The Straits Of Florida, Saul Broida
Journal of Marine Research
Quantitative agreement between geostrophic computations and direct measurements of current and transport in the Straits of Florida, and elsewhere as well, is found only when observations are made under synoptic conditions. Under other conditions, geostrophic computations often show a multiaxial structure (i.e., bands of current) not found with direct measurements; this apparent multiaxial structure could be caused largely by periodic disturbances related to the tides....