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  • Articles  (66)
  • Ocean currents  (58)
  • Fisheries  (8)
  • 550 - Earth sciences
  • Woods Hole Oceanographic Institution  (66)
  • 2015-2019  (66)
  • 1
    Publication Date: 2022-05-25
    Description: Laboratory, theoretical and numerical research was conducted into the structure and stability of baroclinic non-linear currents in a rotating fluid. A rotating version of the dam-break problem in which a . density current is generated after a barrier has been removed was studied. The speed of the current and its width and depth were measured by Whitehead (1981) and more extensively by Stern, Whitehead, and Lien Hua (1982), who report the experiments and compare the results to theory. Properties of a limiting bore solution for rotation density currents predicted earlier by Stern are incorporated into the above theory to predict the speed of the nose of the current. Experiments are described in which the current width is measured to be in reasonable agreement with the theory. Theoretical studies of the stability of a free isolated baroclinic jet whose free surface in cross-section intersects the water surface at two points by Griffiths, Killworth and Stern (1982) was undertaken. The waves permit the release of both kinetic and potential energy. They can have rapid growth rates, thee-folding time for waves on a current with zero potential vorticity being close to one-half of a rotation period. Experiments with a current of buoyant fluid at the free surface of a lower layer were also conducted. The current was observed to be always unstable. Killworth and Stern (1982) showed that a coastal density current in a rotating system is unstable to downstream wave disturbances when the mean potential vorticity increases towards the (vertically-walled) coast and when the mean current vanishes there. Other new instability modes were also found which do not require the potential vorticity extremum of quasi-geostrophic theory. Paldor, in his Ph.D. thesis, used Rayleigh integral to prove that an unbounded geostrophic front of uniform potential vorticity is stable with respect to small perturbations of arbitrary wavelength. Stern and Paldor (1983) used extremum concepts to analyze large amplitude disturbances in a boundary layer shear flow with an inviscid and longwave theory. It was found that initially weak horizontal convergences were concentrated and amplified in time.
    Description: Prepared for the Office of Naval Research under Contract N00014-81-C-0010 and for the National Science Foundation, Ocean Science Division under Grant 0CE 80-18322.
    Keywords: Ocean currents ; Hydrodynamics
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 2
    Publication Date: 2022-05-25
    Description: Despite an absence of freshwater exploitation, the adult salmon run in the Matamek River, Quebec, declined during 1975-1980 to 〈23% of the level thought to occur there prior to 1967. Returns in 1979 and 1980 of adults tagged as smolts were 1.0% and 0.9%, respectively. Numbers of emigrating smolts and their corresponding adult returns are not significantly correlated, although we observed a trend towards more salmon (2 sea year fish) returning with larger numbers of migrating smolts. Since 1967 there is noted a decrease in the age at which returning adults smolted and females appear to now constitute a larger percentage of returning grilse and salmon. These, and other changes in life history characteristics, appear to be caused solely by commercial exploitation.
    Description: Prepared by the Woods Hole Oceanographic Institution and the Department of Recreation, Fish and Game of the Province of Quebec.
    Keywords: Atlantic salmon ; Fish populations ; Atlantic salmon ; Fisheries
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 3
    Publication Date: 2022-05-25
    Description: During the period October 1985 to October 1986 a large group of oceanographers collaborated in an intensive field effort called the Gibraltar Experiment. Scientists from Morocco, Spain, France, the United Kingdom, Canada and the United States joined together to obtain an extensive suite of measurements which greatly enlarged the oceanographic data base for the Strait of Gibraltar. Primary experiment goals included obtaining one realization of the annual flow cycle, understanding the dynamical balances of the strait flow, developing strategies for long-term monitoring of the Strait, and increasing knowledge of strait effects on the adjacent ocean. Preliminary results show progress toward each of these four goals.
    Description: Funding was provided by the Office of Naval Research through contract Numbers N00014-82-C-0019, N00014-85-C-0001, and N00014-87-K-0007.
    Keywords: Oceanography ; Ocean currents ; Oceanus (Ship : 1975-) Cruise ; Malaspina (Ship) Cruise ; Lynch (Ship) Cruise ; Tofino (Ship) Cruise
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 4
    Publication Date: 2022-05-25
    Description: The Nantucket Shoals Flux Experiment (NSFE79) was conducted across the continental shelf and upper slope south of Nantucket from March, 1979 to April , 1980 to measure the flow of shelf water from the Georges Bank/Gulf of Maine region into the Middle Atlantic Bight. Conceived as a cooperative field experiment involving the Northeast Fisheries Center (NMFS), U.S. Geological Survey (Woods Hole), University of New Hampshire, and the Woods Hole Oceanographic Institution, the experiment contained two principal components, a moored array of current meter and bottom instrumentation deployed at six locations across the shelf and upper slope spanning a depth range from 46 m to 810 m, and a series of 27 hydrographic surveys made along or near the moored array line during the experiment. A basic description of the NSFE79 hydrographic data has been given in Part 1 by Wright (1983). A description of the moored array components and the basic moored array data sets is presented here in Part 2.
    Description: The NEFC participation was supported by the NMFS Marine Resources Monitoring, Assessment, and Prediction (MARt-1AP) Program. The U.S. Bureau of Land Management (BLM) supported the USGS field and analysis component under t~emoranda of Understanding M550-MU6-79, M551-MU8- 24, M551-MU9-4, and M551-MU0-18. The WHO! and UNH field programs were supported by the National Science Foundation under Grants OCE 78-19513 and OCE 78-26229.
    Keywords: Oceanography ; Hydrography ; Ocean currents ; Moored arrays
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 5
    Publication Date: 2022-05-25
    Description: Joint US-USSR Mid-Ocean Dynamics Experiment (POLYMODE)
    Description: Under grant OCE78-25612 from the Office of the International Decade of Ocean Exploration of the National Science Foundation .
    Keywords: Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Working Paper
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  • 6
    Publication Date: 2022-05-26
    Description: In October, 1984, the Woods Hole Oceanographic Institution SOFAR float group began a three-year-long field program to observe the low frequency currents in the Canary Basin. The principal scientific goal was to learn how advection and diffusion by these currents determine the shape and amplitude of the Mediterranean salt tongue. Fourteen floats were launched at a depth of 1100 min a cluster centered on 32°N, 24°W, and seven other floats were launched incoherently along a north/south line from 24°N to 37°N. At the same time investigators from Scripps Institution of Oceanography and the University of Rhode Island used four other SOFAR floats to tag a Meddy, a submesoscale lens of Mediterranean water. In October, 1985, seven additional floats were launched, four in three different Meddies, one of which was tracked during year 1. This report describes the second year of the floats launched in 1984 and the first year of the ones launched in 1985. Approximately 41 years of float trajectories were produced during the first two years of the experiment. One of the striking accomplishments is the successful tracking of one Meddy over two full years plus the tracking of two other Meddies during the second year.
    Description: Funding was provided by the National Science Foundation under grant Numbers OCE 82-14066 and OCE 86-00055.
    Keywords: Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 7
    Publication Date: 2022-05-26
    Description: The flow through the Strait of Gibraltar has always held a special fascination for oceanographers. Attempts to understand and measure the strong currents in the Strait stimulated many of the early advances in oceanography (Deacon, 1971). Over the centuries, the focus of scientific investigations has shifted from understanding how the mass budget of the Mediterranean is maintained in the presence of the strong inflow of Atlantic water through the Strait of Gibraltar, to observing the outflow of Mediterranean water over the Gibraltar sill, to measuring the two-layer. exchange of Atlantic inflow and Mediterranean outflow through the Strait. In the past few years the focus has again shifted to the study of how the dynamical constraints for flow through a narrow and shallow strait act to control the amount of exchange between the Atlantic and Mediterranean basins. To investigate the dynamics of flow through a strait, a year-long field experiment has been designed to measure the flows through the Strait of Gibraltar, including their time variability over tidal to seasonal time scales, and to assess the importance of friction, mixing, rotation, and nonlinear processes in controlling the exchange through the Strait. This field program, called the Gibraltar Experiment, will be carried out by a group of American, Spanish, Moroccan, Canadian and French scientists during the period from Fall 1985 to Fall 1986.
    Description: Funding was provided by the Office of Naval Research under contracts no. N00014-82-C-0019, NR 083-004, and N00014-85-C-0001, NR 083-004.
    Keywords: Oceanography ; Oceanic mixing ; Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 8
    Publication Date: 2022-05-26
    Description: In October, 1984, the Woods Hole Oceanographic Institution SOFAR float group began a three-year long field program to observe the low frequency currents in the Canary Basin. The principal scientific goal was to learn how advection and diffusion by these currents determine the shape and amplitude of the Mediterranean salt tongue. Fourteen floats were launched at a depth of 1100 min a cluster centered on 32N, 24W, and seven other floats were launched incoherently along a north/south line from 24N to 37N. At the same time investigators from Scripps Institution of Oceanography and the University of Rhode Island used four other SOFAR floats to tag a submesoscale lens of Mediterranean water. Slightly over twenty years of float trajectories were p reduced during the first year of the experiment. In this report we briefly describe the 1984 field operations and show the first year's SOFAR float data. Perhaps the most striking result is that westward flow within the Mediterranean salt tongue was found to be confined to a rather narrow jet {roughly 150 km in meridional extent) which had a mean speed of roughly 2 em s -l. To the north or south of this jet the mean flow was much weaker and eastward. This suggests that currents associated with the salt tongue itself {rather than the gyre scale circulation) may be most important for determining the salt distribution.
    Description: Funding was provided by the National Science Foundation under grant Nos. OCE 82-14066 and OCE 86-00055.
    Keywords: Ocean currents
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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  • 9
    Publication Date: 2022-05-26
    Description: From the Forward: The idea for an Exploratory Workshop on Fisheries Sociology emerged from informal discussions held at the 1983 Rural Sociological Society meetings. Planning for the Exploratory Workshop was undertaken by the two of us (Bailey and Harris) with the assistance of Peter Sinclair and Christopher Vanderpool. We sought to identify persons working in different areas of the sociology of fisheries who could present review papers on their areas of inquiry. The papers in this volume are the result of that effort. At the same time, we sought to identify persons who would be interested in attending such a workshop• By combining our personal networks, the mailing list of the Fisheries Anthropologist at the National Marine Fisheries Service (Peter Fricke), and the list of attendees at two sessions on fisheries organized by Bailey at the 1984 Rural Sociological Society meetings, we developed a mailing list of 83 sociologists working on some aspect of fisheries. Invitations to attend the workshop were sent to those persons. In response to the invitation, 24 sociologists attended the Workshop. They came from eleven states, the District of Columbia and Puerto Rico, three provinces of Canada, and Norway. They represented work in both industrialized and developing nations, in subsistence, recreational and commercial fisheries, and in aquaculture.
    Description: This report was prepared with funds from the American Sociological Society; U.S. Department of Commerce, NOAA, Office of Sea Grant under Grant Number NA84AA-D-00033 (R/S-12); and the J . N. Pew, Jr. Charitable Trust.
    Keywords: Fisheries ; Fishery management
    Repository Name: Woods Hole Open Access Server
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  • 10
    Publication Date: 2022-05-26
    Description: The Long-Term Upper Ocean Study (LOTUS) was a two-year field experiment near 34°N, 70°W, designed to acquire a continuous set of measurements of currents and temperatures in the upper, open ocean together with local hydrography, meteorology, and mesoscale oceanographic features. The first scientific moorings were deployed in May 1982. The first year of mooring data, from May 1982-April 1983, is presented by Tarbell, Pennington and Briscoe (1984, W.H.O.I. Tech. Rept. 84-36). The second year of mooring data, from April 1983-May 1984, when the final mooring recovery occurred, is presented here.
    Description: Funding was provided by the Office of Naval Research under contract Nos. N00014-76-C-0197, NR 083-400, and N00014-84-C-0134, NR 083-400.
    Keywords: Long Term Upper Ocean Study (LOTUS) ; Ocean temperature ; Ocean currents ; Ocean-atmosphere interaction ; Deep-sea moorings
    Repository Name: Woods Hole Open Access Server
    Type: Technical Report
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