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Browsing Applied Ocean Physics and Engineering (AOP&E) by Author "Ledwell, James R."

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Browsing Applied Ocean Physics and Engineering (AOP&E) by Author "Ledwell, James R."

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  • Lavelle, J. William; Thurnherr, Andreas M.; Ledwell, James R.; McGillicuddy, Dennis J.; Mullineaux, Lauren S. (American Geophysical Union, 2010-12-31)
    We report the first 3-D numerical model study of abyssal ocean circulation and transport over the steep topography of the East Pacific Rise (EPR) and adjoining Lamont seamount chain in the eastern tropical Pacific. We begin ...
  • Rye, Craig D.; Messias, Marie-Jose; Ledwell, James R.; Watson, Andrew J.; Brousseau, Andrew; King, Brian A. (American Geophysical Union, 2012-02-21)
    A section across the Atlantic at 24°S recorded in March 2009, sampled a tracer plume released in the deep Brazil Basin 13 years earlier. The 1-D diffusion equation was used to model the vertical spread of the tracer, ...
  • Ledwell, James R.; St. Laurent, Louis C.; Girton, James B.; Toole, John M. (American Meteorological Society, 2011-01)
    The vertical dispersion of a tracer released on a density surface near 1500-m depth in the Antarctic Circumpolar Current west of Drake Passage indicates that the diapycnal diffusivity, averaged over 1 yr and over tens of ...
  • Thurnherr, Andreas M.; Ledwell, James R.; Lavelle, J. William; Mullineaux, Lauren S. (2010-12-12)
    Topography has a strong effect on the physical oceanography over the flanks and crests of the global mid-ocean ridge system. Here, we present an analysis of the hydrography and circulation near the crest of the East ...
  • Ledwell, James R.; Duda, Timothy F.; Sundermeyer, Miles A.; Seim, Harvey E. (American Geophysical Union, 2004-10-26)
    Dye release experiments were performed together with microstructure profiling to compare the two methods of estimating diapycnal diffusivity during summer and fall stratification on the continental shelf south of New ...
  • Proehl, Jeffrey A.; Lynch, Daniel R.; McGillicuddy, Dennis J.; Ledwell, James R. (2004-09-29)
    Circulation and transport at the North Flank of Georges Bank are studied using a data-assimilative 3-D model of frontal dynamics under stratified, tidally energetic conditions over steep topography. The circulation model ...
  • Lavelle, J. William; Thurnherr, Andreas M.; Mullineaux, Lauren S.; McGillicuddy, Dennis J.; Ledwell, James R. (The Oceanography Society, 2012-03)
    One aspect of ocean flow over mid-ocean ridges that has escaped much attention is the capacity of a ridge to convert oscillatory flows into unidirectional flows. Those unidirectional flows take the form of relatively narrow ...
  • Sheen, K. L.; Brearley, J. A.; Naveira Garabato, Alberto C.; Smeed, D. A.; Waterman, Stephanie N.; Ledwell, James R.; Meredith, Michael P.; St. Laurent, Louis C.; Thurnherr, Andreas M.; Toole, John M.; Watson, Andrew J. (John Wiley & Sons, 2013-06-04)
    The spatial distribution of turbulent dissipation rates and internal wavefield characteristics is analyzed across two contrasting regimes of the Antarctic Circumpolar Current (ACC), using microstructure and finestructure ...
  • Sundermeyer, Miles A.; Ledwell, James R.; Oakey, Neil S.; Greenan, Blair J. W. (American Meteorological Society, 2005-07)
    Evidence is presented that lateral dispersion on scales of 1–10 km in the stratified waters of the continental shelf may be significantly enhanced by stirring by small-scale geostrophic motions caused by patches of mixed ...
  • Sundermeyer, Miles A.; Terray, Eugene A.; Ledwell, James R.; Cunningham, A. G.; LaRocque, P. E.; Banic, J.; Lillycrop, W. J. (American Meteorological Society, 2007-06)
    Results are presented from a pilot study using a fluorescent dye tracer imaged by airborne lidar in the ocean surface layer on spatial scales of meters to kilometers and temporal scales of minutes to hours. The lidar used ...
  • St. Laurent, Louis C.; Naveira Garabato, Alberto C.; Ledwell, James R.; Thurnherr, Andreas M.; Toole, John M.; Watson, Andrew J. (American Meteorological Society, 2012-12)
    Direct measurements of turbulence levels in the Drake Passage region of the Southern Ocean show a marked enhancement over the Phoenix Ridge. At this site, the Antarctic Circumpolar Current (ACC) is constricted in its flow ...
  • Ho, David T.; Ledwell, James R.; Smethie, William M. (American Geophysical Union, 2008-02-19)
    SF6 tracer release experiments (TREs) have provided fundamental insights in many areas of Oceanography. Recently, SF6 has emerged as a powerful transient tracer, generating a need for an alternative tracer for large-scale ...
  • Donoghue, Terence; Ledwell, James R.; Doherty, Kenneth W. (Woods Hole Oceanographic Institution, 1998-12)
    Conventional "spot" sampling of patchy distributions of oceanic constituents can lead to sampling errors. Interpretation of results based on data of disparate temporal or spatial resolution can be difficult or impossible. ...

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