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Topic: Oceanic current


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In the News (Fri 13 Nov 09)

  
  8 - Current: online yachting reference on currents, tidal currents and ocean currents
Currents reflect the horizontal movement of water whereas tides reflect vertical movements.
The earth's rotation (origin of the Coriolis force) and the change in wind direction with latitude (from the east in the tropics and from the west at mid-latitudes) cause the circulation of the gyres to be clockwise in the Northern Hemisphere and counterclockwise in the Southern Hemisphere.
The well-known Gulf Stream in the Atlantic and its counterpart in the Pacific, the Kuroshio Current, are strong currents that carry heat northward from the tropics.
www.sailingissues.com /courses/navigationcourse8.html   (499 words)

  
 Waves and Currents in the Olympic Coast National Marine Sanctuary
The oceanic current system off the coast of Washington is comprised of the California Current, Davidson Current, and California Undercurrent.
The California Current is strongest in July and August in association with westerly to northwesterly winds.
While currents are flowing south along the coast during spring and summer months, the forces of northwesterly winds and the earth's rotation combine to push the surface waters offshore.
ocnms.nos.noaa.gov /living/ocean_processes/waves_currents/welcome.html   (807 words)

  
 Lynn K. "Nick" Shay   (Site not responding. Last check: 2007-11-01)
In oceanic regimes with thin oceanic mixed layers (OML), the SST cooling causes negative feedback on storms that reduce air-sea fluxes.
In this context, the SST response and oceanic heat content (OHC) variability strongly depend on oceanic current (and shear) response to storm forcing.
The oceanic measurement strategy profiled ocean current, temperature and salinity conditions in the Caribbean Sea and in the Gulf of Mexico using airborne expendable oceanic profilers.
wwwt.emc.ncep.noaa.gov /seminars/abstract.2004/Shay.html   (446 words)

  
 JPGM10A
Variations in the pressure torque, the inertia tensor of the ocean and the momentum connected with the currents are calculated diagnostically from the OGCM output.
However, the net oceanic excitation involves significant cancellation between the contributions of individual ocean basins and between terms, e.g., between the sea level and density contributions to the mass term.
The results we infer for the oceanic contribution to fluctuations in the length-of-day are compared with LOD fluctuations determined by the IERS, with the (dominant) atmospheric contribution removed.
www.olympus.net /IAPSO/JointAssembly97/abstracts/jpgm10.html   (2975 words)

  
 PANGAEA: Projects: Dino-Atlas
The northern boundary of the SEC is formed by the North Equatorial Counter Current, with the contact between these two currents leading to convergence and downwelling of surface waters, thereby depressing the thermocline and resulting in warm, oligotrophic and generally stratified water masses.
The present-day surface oceanic circulation of the eastern South Atlantic is coupled to the surface atmospheric circulation, characterised by the south-east trade-winds (SE trade-winds).
The oceanic circulation of the Arabian Sea is strongly influenced by the semi-annual reversal of wind patterns; the south-west (SW) monsoon in the boreal summer and north-east (NE) monsoon in the boreal winter.
www.pangaea.de /Projects/Dino-Atlas/Oceanographic.html   (4095 words)

  
 Currents-Their Causes and Effects   (Site not responding. Last check: 2007-11-01)
Examples of large surface currents that move across vast expanses of ocean are the Gulf Stream, the North Atlantic Current, the California Current, the Atlantic South Equatorial Current, and the Westwind Drift.
Surface ocean currents are deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere due to the Coriolis effect.
Currents are important to marine life as they help to move food and nutrients, making them available for photosynthesis, metabolic requirements and/or consumption.
drifters.doe.gov /currents/currents.html   (777 words)

  
 OCEANIC CIRCULATION
The meridional density gradients associated with the ACC are intimately tied to the mean stratification of the entire ocean to the north of the ACC, and it is becoming increasingly evident that the dynamics of the Southern Ocean are crucial in determining the stratification and overturning circulation of the entire ocean (1313, 1595, 1700, 1728).
An increase in the wind stress is partly compensated by increases in the pycnocline depth and overturning at the northern wall, partly compensated by an increase in eddy fluxes.
The isotopic fluxes are caused by net oceanic CO uptake and by the existence of an air-sea disequilibrium due to a lagged isotopic Suess Effect in the ocean.
www.gfdl.noaa.gov /reference/AR00/5OceanicCirculation.html   (7973 words)

  
 [No title]
In current oceanic operations, the International Civil Aviation Organization (ICAO) establishes standards and recommended practices while the United States is responsible for implementing prescribed procedures and separation standards for the large areas of oceanic airspace in which the United States has been delegated responsibility to provide ATC services.
Current separation standards are based on air and ground system capabilities that were available at the time that each individual standard was implemented.
Oceanic Free Flight, as defined in the Final Report of RTCA Task Force 3: Free Flight Implementation [5], is a concept that is currently being refined and explored.
faa.gov /ats/ato/150_docs/STRATEGIC_PLAN_V01-2002_draft1.0_Master1.doc   (10654 words)

  
 Halfbakery: oceanic MHD
An electrical current passed though the brine caused a circulation of the brine.
That is, the magnetic field by the electrical current in the wire acts to cancel out the Earths magnetic field in the area of the tidal current.
I suspect that the direction of the generated electrical current would be the same regardless of the direction of the water current - the electrical current generated produces a magnetic field to oppose the earth's magnetic field.
www.halfbakery.com /idea/oceanic_20MHD   (1490 words)

  
 Ecology
Global air currents mix the atmosphere and maintain nearly the same balance in areas of intense biological activity and areas of slight biological activity.
The oceans are large tanks, which store water, ensure a thermal and climatic stability, as well as the transport of the chemical elements thanks to large oceanic current s.
For example, water may circulate between ecosystems by the means of a river or ocean current.
www.nebulasearch.com /encyclopedia/article/Ecology.html   (4495 words)

  
 Thermohaline circulation
Oceanic thermohaline -- so named because it involves both heat, hence "thermo," and salt, hence haline, for common table salt (halite) -- circulation is what drives the Conveyor.
As it continues on its submarine migration, the current mixes with warmer water, warms, and rises, until finally, in the northern Pacific, it dissipates as a coherent entity.
The currents depicted are color-coded: purple for surface currents, red for those at intermediate levels and for Antarctic subsurface water, green for deep currents, and blue for those which hug the ocean bottom (From Siedler, 2001, figure 1.2.7, as taken from Schmitz, 1996).
www.killerinourmidst.com /THC.html   (1602 words)

  
 Volcanoes Hazards Updates   (Site not responding. Last check: 2007-11-01)
Current status is Volcano Advisory (Alert Level 2) Aviation color code ORANGE : Growth of the new lava dome inside the crater of Mount St. Helens continues, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash.
CURRENT LEVEL OF CONCERN COLOR CODE IS Seismic data and satellite observations indicated that a moderate ash eruption of the volcano continues.
CURRENT LEVEL OF CONCERN COLOR CODE IS Seismic data and satellite observations indicated that growth of the lava dome continues.
volcanoes.usgs.gov /update.html   (2422 words)

  
 Convergence Zones
The Malvinas current is actually an offshoot of the Antarctic Circumpolar Current, a branch that veers northward along the South American continental shelf.
In the cylinder on the cold side (the Malvinas Current side) of the convergence zone, the "outside" circulation is upward (called upwelling, of course), bringing nutrients to the surface.
Because they frequently mark the boundaries of currents, their position can be used to model the interaction of different oceanic current systems.
disc.gsfc.nasa.gov /oceancolor/scifocus/oceanColor/convergence.shtml   (1280 words)

  
 Ocean Currents and Climate
The produce large circular currents in all the ocean basins.
Note the difference is strength (Sv) between the western and eastern boundary currents.
This is caused by the effect of the rotating Earth which tends to move the "hill" of water to the western sides of the ocean basins
earth.usc.edu /~stott/Catalina/Oceans.html   (582 words)

  
 Remote Sensing Tutorial Page 14-11
Much of the oceanic information, as gathered from space, comes as secondary information from Metsats, although a growing number of satellites, and a few Shuttle missions, are/were specifically dedicated to collecting oceanographic data.
Some of this variation is due to inflow and mixing of river waters but ocean currents and upwelling also modify the patterns.
Ocean currents, such as the Gulf Stream off the eastern U.S. coast, and the Pacific current, off the west coast, result from redistribution of warm water that collects in tropical regions and flows towards cooler zones at higher latitudes.
rst.gsfc.nasa.gov /Sect14/Sect14_11.html   (1661 words)

  
 IPY: International Polar Year
The inception of this oceanic current circulation and its changes through time are widely thought to have been responsible for major global climatic and environmental changes on Earth.
For this propose the previous and current marine researches carried out in the same region by the SCAN group from Instituto Andaluz de Ciencias de la Tierra-CSIC-University of Granada, Spain, lead by Dr. Andres Maldonado, are specially relevant.
Annual workshops are intended to review the progress of the project, to present and exchange initial results of past and current surveys, investigations and modelling and to coordinate presentations of results at international congresses and their publications.
www.ipy.org /development/eoi/details.php?id=246   (1149 words)

  
 [No title]   (Site not responding. Last check: 2007-11-01)
Canonical correspondence analysis of diatoms from surface sediment samples and oceanographic environmental variables shows that summer and winter sea-surface temperatures, water depth and winter sea-surface salinity are the main environmental factors affecting the diatom distribution in the ocean around Iceland.
Four diatom assemblages are distinguished and the distribution of these assemblages is clearly correlated with oceanic current patterns in the region.
The warm diatom assemblage is located in the area dominated by the Irminger Current and may be used as an indicator of warm water masses (Atlantic Water).
www.hi.is /~jeir/ab_1005.html   (194 words)

  
 Remote Sensing - Dr. Roland Romeiser
Romeiser, R., et al., On the remote sensing of oceanic and atmospheric convection in the Greenland Sea by synthetic aperture radar, J.
Romeiser, R., and D.R. Thompson, On the detection of spatially varying current fields at the ocean surface by along-track interferometric synthetic aperture radar, Proc.
Brandt, P., R. Romeiser, and A. Rubino, On the dependence of radar signatures of oceanic internal solitary waves on wind conditions and internal wave parameters, Proc.
www.ifm.uni-hamburg.de /~wwwrs/staff_romeiser.htm   (2340 words)

  
 e-Prints Soton - Remote sensing of oceanic current features by synthetic aperture radar - achievements and perspectives
However, the retrieval of actual surface current fields from the shape and modulation depth of radar signatures is a much more challening problem, since the imaging mechanism is a complex and nonlinear two-step mechanism which cannot be inverted easily.
In this article we review the state-of-the-art in modeling radar signatures of current features and we present the concept of an iterative scheme for inverting radar images into current fields, which will be implemented within the framework of the European project MARSAIS.
According to the results of our analyses, it should be possible to retrieve spatial surface current variations and current gradients from a typical spaceborne C band SAR image with an accuracy on the order of 20% and a spatial resoution on the order of 50m.
eprints.soton.ac.uk /17518   (304 words)

  
 About Ships
The IRVP project is currently operating in a non-funded status, with the University of Delaware absorbing daily operating costs.
Currently these are the Baltic Sea (BONUS) Portal group and the EurOcean portal group.
Currently only one PI and science mission is listed per cruise.
www.researchvessels.org /about_ships.html   (1369 words)

  
 NOAA Home Page
"Currently, weak El Niño conditions exist, but there is a potential for this event to strengthen into a moderate event by winter," said Vernon Kousky, NOAA's lead El Niño forecaster.
Coral reefs, tides, currents, buoys, marine sanctuaries, estuaries, diving, spills
Publication of the National Oceanic and Atmospheric Administration (NOAA), U.S. Department of Commerce.
www.noaa.gov   (632 words)

  
 Welcome to OCEANIC
It provides global and regional data sets and analyses for research, for operational oceanographic and meteorological services; and for monitoring, detection of change, and prediction of future conditions.
This database describes these ships, their past, present and future sea-going programs together with relevant supporting information, Currently the most comprehensive information is available for the US research fleet but international input is actively sought.
The documentation of the planning and execution together with the data acquired during WOCE-(an experiment describing the dynamics and physical and chemical state of the global oceans in the 1990's)-has moved to its permanent archive at: http://woce.nodc.noaa.gov/wdiu/
diu.cms.udel.edu   (219 words)

  
 Teledyne RDI Library & Reference Center: ADCP Bibliography
Haehnel M. (1990) Employing an Acoustic Current Profiler in Surveys of the Arctic Front in the Greenland Sea, Proceedings of the IEEE Fourth Working Conference on Current Measurement, April 3-5, 1990, Clinton, Maryland, 173-179.
Saunders, P. and B. King (1995) Bottom Currents Derived from a Shipborne ADCP™ on WOCE Cruise A11 in the South Atlantic, J. Phys.
USGS, Coastal and Marine Geology (2000) Assessment of the Accuracy of the Tilt Sensor in the Teledyne RDI Workhorse ADCP™.
www.rdinstruments.com /bib.html   (7693 words)

  
 Doron Nof, PhD - Physical Oceanography at Florida State University
Ph.D., University of Wisconsin, Madison (Residency: Department of Atmospheric and Oceanic Sciences);
The Role of the Bering Strait in the General Oceanic and Circulation Climate
An instrument developed by me to demonstrate physical oceanic processes to nonscientists was featured on the PBS educational television program "Scientific American Frontiers" (1994).
doronnof.net /vcurriculum.php   (538 words)

  
 NOAA Tides and Currents - Home
NOAA Tides and Currents, managed by the Center for Operational Oceanographic Products and Services (CO-OPS), is the portal to the National Oceanic and Atmospheric Administration's vast collection of oceanographic and meteorological data (historical and real-time), predictions, and nowcasts and forecasts.
CO-OPS provides the national infrastructure, science, and technical expertise to monitor, assess, and distribute tide, current, water level, and other coastal oceanographic products and services that support NOAA's misson of environmental stewardship and environmental assessment and prediction.
Data may be retrieved using this map or via station lists from the "Products" drop down menu.
tidesandcurrents.noaa.gov   (207 words)

  
 NWS Internet Weather Source
Facsimile (fax) charts produced by the U.S. National Weather Service.
Current weather and weather conditions for the past 24 hours.
Current and recent METAR, TAF, and Short-term TAF data access reports from around the world, along with an explanation of Meteorological Character Codes.
weather.noaa.gov   (102 words)

  
 Predicting El Niño: Lab researcher has some answers, more questions
In modern usage, the term refers to the oceanic and atmospheric condition in which the sea-surface temperature in the tropical eastern Pacific area becomes significantly warmer than normal, and the prevailing westward trade winds either disappear or reverse direction.
Lai believes the Antarctic Circumpolar Wave, a series of weather anomalies originating in the Southern Oceans, may hold a key to understanding the El Niño phenomenon.
The Southern Oceans are the only oceanic domain encircling the globe, and they contain the strong eastward flow of the Antarctic Circumpolar Current, the unifying link for exchanges of water masses at all depths between the world's major ocean basins.
www.lanl.gov /worldview/news/releases/archive/01-011.shtml   (830 words)

  
 MKE Current: See live conditions and views of Milwaukee, Wisconsin, USA
Weather: Current weather observations and forecasts for Milwaukee
Cams: Live views of Milwaukee; helpful for finding out about current weather and road conditions in Milwaukee
Traffic-Mqt: Marquette Interchange Travel Information; shows current conditions at the interchange of I43 and I94/I794 near Marquette University in downtown Milwaukee, under construction until 2008
www.december.com /places/mke/current.html   (493 words)

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