REVIEW OF THE OCEANOGRAPHIC ENVIRONMENT OF THE TONGUE OF THE OCEAN, BAHAMAS PART 2: SURVEY AND ANALYSIS OF OCEAN CURRENT DATA

1963 ◽  
Author(s):  
G. S. Cook
Keyword(s):  
Current Data ◽  
Ocean Current

The Application and Antifouling of AEM-RS in Ocean Current Buoy

2013 ◽  
Vol 373-375 ◽  
pp. 739-742
Author(s):  
Guo Hua Zhang ◽  
Shi Xuan Liu ◽  
Bin Miao
Keyword(s):  
Performance Index ◽  
Current Data ◽  
Ocean Current ◽  
Electromagnetic Current ◽  
Resource Exploitation ◽  
Marine Resource ◽  
Ultrasonic Cleaning ◽  
Oceanographic Research ◽  
Rapid Monitoring ◽  
Technical Platform

Equipped with type AEM-RS electromagnetic current meter, the buoy provided effective technical platform for on-site rapid monitoring of the ocean current. Performance index and usage in the ocean current buoy of AEM-RS was introduced. Ultrasonic cleaning method in seawater was developed for preventing AEM-RS from biofouling. Ocean current data can serve for oceanographic research and marine resource exploitation.

scholarly journals Pelagic Sargassum Prediction and Marine Connectivity in the Tropical Atlantic

2020 ◽  
Vol 31 ◽  
pp. GCFI20-GCFI30
Author(s):  
Donald R. Johnson ◽  
James S. Franks ◽  
Hazel A. Oxenford ◽  
Shelly-Ann L. Cox
Keyword(s):  
Surface Current ◽  
Current Data ◽  
Ocean Current ◽  
Tropical Atlantic ◽  
Skill Levels ◽  
Vector Correlation ◽  
Marine Connectivity ◽  
Pelagic Habitat ◽  
Arrival Dates ◽  
High Skill

Since 2011, pelagic Sargassum has experienced extraordinary blooms in the Tropical Atlantic where a system of persistent but seasonally variable currents has retained and consolidated it in large masses. Although beneficial at sea, principally as a unique pelagic habitat, when Sargassum inundates the nearshore environment it can have catastrophic effects on tourism, fisheries, health, and local ecosystems. Providing advanced warning of arrival dates of large masses of Sargassum is critical for enabling preparations and planning for its removal, use, and mitigation. Predictions of arrival time and location involve satellite identification of Sargassum at sea together with ocean current data for forward model tracking. However, forecast ocean current data are generally valid for only 5—7 days. In this study, ocean currents from 2 models (HYCOM and OSCAR) are validated against satellite tracked drifters from the Global Drifter Program with vector correlation and with skill in replicating a drifter pathway. Various wind additions to the models are also tested. Although both models capture the surface current systems in the Tropical Atlantic, they are mediocre in performance along both boundaries. In contrast, a drifter based current data model with 0.5% wind addition had high skill levels. This skill—tested drifter—based model was then used to determine marine connectivity across the Tropical Atlantic and suggests a much broader spread of Sargassum in the eastern Tropical Atlantic than is presently observed by satellites, conforming to earlier hypotheses. This model forms the basis for seasonal scale Sargassum forecasting.

Sensitivity Mapping – With Flare! An Internet Approach to Environmental Mapping

2003 ◽  
Vol 2003 (1) ◽  
pp. 95-102
Author(s):  
André Laflamme ◽  
Roger J. Percy
Keyword(s):  
Current Data ◽  
Open Architecture ◽  
Ocean Current ◽  
Gis Mapping ◽  
Web Mapping ◽  
Environmental Mapping ◽  
Mapping System ◽  
Ready Availability ◽  
On Line ◽  
The Web

ABSTRACT During emergencies the ready availability of information on the location and vulnerability of resources at risk is crucial to a successful response and in preventing or minimizing further environmental impacts. Environment Canada, Atlantic Region, has developed over a number of years a computer based GIS mapping system for managing and analyzing environmental information. This stand-alone user friendly mapping application has recently moved to the web; allowing broader access by federal, provincial and industry partners in the spill response field. Enhancements have been made that facilitate better coordination and exchange of data among partners. It incorporates a unique shoreline classification system which can be viewed in concert with biological, human use and logistical data. It includes a spill logging function to manage situation reports, maps, resource summaries, photographs and trajectory model outputs. The system allows thematic layers to be displayed on either topographic maps or hydrographic charts and possesses links to other sites that allow real-time display of weather and ocean current data useful in a response. With an open architecture concept the web mapping system is readily modified; partners are able to digitize on-line and to update their own databases shared on the system. Mapped data for the northeastern United States is also included in the package to facilitate joint response to trans-boundary pollution incidents. Although this paper will highlight the unique features of the web mapping application for planning and responding to environmental emergencies, other partners are using the system for conducting environmental assessments, inland management projects, or planning for nuclear emergencies around the globe.

scholarly journals Estimates of Ocean Currents Using a Labrador Sea Ice Model

1983 ◽  
Vol 4 ◽  
pp. 141-146
Author(s):  
T. E. Keliher ◽  
J. S. Foley
Keyword(s):  
Current Data ◽  
Ocean Current ◽  
Labrador Sea ◽  
Data Set ◽  
Model Simulations ◽  
Pack Ice ◽  
Ice Drift ◽  
Ice Concentration ◽  
Fast Ice ◽  
Ice Model

Efforts to develop a dynamical model of Labrador pack ice have been hampered by a lack of input data, especially ocean current data. This work reports the results of approaching this problem in another way, where model simulations are used as a basis for adjusting the input currents to obtain agreement with ice drift data. The ice drift data comes from a period in February 1977 when a ship was fast in the northern Labrador pack. Unfortunately, the ship experienced navigation problems and the direct current observations were suspect. The model simulations bear this out indicating that it would have been very unlikely that the observed currents along with the other forcing terms could lead to the observed ice drift. A climatological current data set gave better agreement and was slightly modified to give the best agreement. This improved data set was used for a short sensitivity test of the rheological specifications of the model. It was found that the ice drift tracks were not very sensitive to the linear viscous stress law but were more sensitive to the parameterization used to reduce ice velocities in areas of high ice concentration and fast ice. Further plans are to use a model with a more realistic rheological component in order to assess its importance in estimating currents.

scholarly journals Some Results from a Linear-Viscous Model of the Arctic Ice Cover

1979 ◽  
Vol 22 (87) ◽  
pp. 293-304 ◽  
Author(s):  
W. D. Hibler ◽  
W. B. Tucker
Keyword(s):  
Local Stress ◽  
Ice Cover ◽  
Current Data ◽  
The Arctic ◽  
Ocean Current ◽  
Drift Model ◽  
Time Period ◽  
Ice Drift ◽  
Non Local ◽  
Arctic Ice

AbstractIn order to assess the effect of non-local stress transferral through the ice cover empirically, a linear viscous model (employing both bulk and shear viscosities) is used to predict drift-rates for one Soviet and two U.S. drifting stations over the time period May 1962 to April 1964. The predictions, based on available atmospheric pressure and ocean-current data, are compared to free-drift results and to observed values. The empirical viscosity values giving the best fit to observations show a pronounced seasonal variation that correlates well with the growth rate of thin ice. Drift predictions, especially long-term net drift results, show drift magnitudes and turning angles to be simulated significantly better by a viscous model than by a free-drift model. The effects of steady currents are shown to be small for velocities averaged over days but significant for averages over years.

scholarly journals Analysis of Sparse and Noisy Ocean Current Data Using Flow Decomposition. Part I: Theory

2003 ◽  
Vol 20 (4) ◽  
pp. 478-491 ◽  
Author(s):  
Peter C. Chu ◽  
Leonid M. Ivanov ◽  
Tatiana P. Korzhova ◽  
Tatiana M. Margolina ◽  
Oleg V. Melnichenko
Keyword(s):  
Current Data ◽  
Ocean Current ◽  
Flow Decomposition

scholarly journals Analysis of Sparse and Noisy Ocean Current Data Using Flow Decomposition. Part II: Applications to Eulerian and Lagrangian Data

2003 ◽  
Vol 20 (4) ◽  
pp. 492-512 ◽  
Author(s):  
Peter C. Chu ◽  
Leonid M. Ivanov ◽  
Tatiana P. Korzhova ◽  
Tatiana M. Margolina ◽  
Oleg V. Melnichenko
Keyword(s):  
Current Data ◽  
Ocean Current ◽  
Lagrangian Data ◽  
Flow Decomposition

scholarly journals Ship Speed Measurement

1975 ◽  
Vol 28 (3) ◽  
pp. 368-370
Author(s):  
C. A. Robinson
Keyword(s):  
Weather Conditions ◽  
Current Data ◽  
Ocean Current ◽  
Forward Speed ◽  
Related Information ◽  
Speed Measurement ◽  
Using Data ◽  
Ship Speed ◽  
Naval Architect ◽  
Better Than

If an analysis is made of the speed of a ship using data recorded in log-books the results are extremely disappointing, and do not reflect the accuracies of the instrumentation in use. Even data from a satellite navigator, where the speeds should have an accuracy of better than I per cent, give a I-knot band in recorded speed; in a 20-knot ship this is 5. per cent. Such inaccuracies require explanation.To begin with one must ask what is meant by ship's speed, and different interpretations come from different people. The navigator is concerned with speed over the ground, while the naval architect or marine engineer is mainly interested in the forward speed of the ship through the water. On the other hand a compiler of ocean current data will require both the speed over the ground and the speed made good through the water, but the latter must take leeway into account. Finally, a weather routing consultant is looking for the actual forward speed the ship can achieve through the water in the prevailing weather conditions. All users of speed data may require other related information, such as the ocean currents and the leeway characteristics of the ship, which can in fact only be compiled from ship speed data. At the present time all these different requirements have to be satisfied by the speeds measured at sea and recorded in the logbooks and their abstracts. Ships' officers compile these records, but by the nature of their work they are biased towards the navigational concept of speed.

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