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  • Boundary currents
  • Diapycnal mixing
  • North Atlantic Ocean
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  • 1
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    Basins on the Atlantic Seaboard : Petroleum Geology, Sedimentology and Basin Evolution (1992)
    London : The Geological Society
    Details
    Keywords: Britische Inseln ; Geologie ; Atlantic Coast ; Basins (Geology) ; Geology ; Great Britain ; North Atlantic Ocean ; Petroleum
    Description / Table of Contents: John Parnell: Basins on the Atlantic Seaboard: introduction / Geological Society, London, Special Publications, 62:vii-viii, doi:10.1144/GSL.SP.1992.062.01.01: Basin Histories and Hydrocarbon Source Rocks --- J. Parnell: Burial histories and hydrocarbon source rocks on the North West Seaboard / Geological Society, London, Special Publications, 62:3-16, doi:10.1144/GSL.SP.1992.062.01.02 --- Alan M. Stein: Basin development and petroleum potential in The Minches and Sea of the Hebrides Basins / Geological Society, London, Special Publications, 62:17-20, doi:10.1144/GSL.SP.1992.062.01.03 --- Mark T. Dean: Conodont colour maturation indices for the Carboniferous of west-central Scotland / Geological Society, London, Special Publications, 62:21-23, doi:10.1144/GSL.SP.1992.062.01.04 --- David J. Mossman: Carboniferous source rocks of the Canadian Atlantic margin / Geological Society, London, Special Publications, 62:25-33, doi:10.1144/GSL.SP.1992.062.01.05 --- Jane Thrasher: Thermal effect of the Tertiary Cuillins Intrusive Complex in the Jurassic of the Hebrides: an organic geochemical study / Geological Society, London, Special Publications, 62:35-49, doi:10.1144/GSL.SP.1992.062.01.06 --- Introduction to Mesozoic Basins on the North West Seaboard --- Nicol Morton: Late Triassic to Middle Jurassic stratigraphy, palaeogeography and tectonics west of the British Isles / Geological Society, London, Special Publications, 62:53-68, doi:10.1144/GSL.SP.1992.062.01.07 --- The Hebridean Basins and Adjacent Areas --- Patrick J. McKeever: Petrography and diagenesis of the Permo-Triassic of Scotland / Geological Society, London, Special Publications, 62:71-96, doi:10.1144/GSL.SP.1992.062.01.08 --- P. J. McKeever, P. Carey, and J. Quinn: Authigenic K-Feldspar in the Permo-Triassic of northwest Britain: a pilot oxygen isotope study / Geological Society, London, Special Publications, 62:93-96, doi:10.1144/GSL.SP.1992.062.01.09 --- Nicol Morton: Dynamic stratigraphy of the Triassic and Jurassic of the Hebrides Basin, NW Scotland / Geological Society, London, Special Publications, 62:97-110, doi:10.1144/GSL.SP.1992.062.01.10 --- J. P. Harris: Mid-Jurassic lagoonal delta systems in the Hebridean basins: thickness and facies distribution patterns of potential reservoir sandbodies / Geological Society, London, Special Publications, 62:111-144, doi:10.1144/GSL.SP.1992.062.01.11 --- Mark Wilkinson: Concretionary cements in Jurassic sandstones, Isle of Eigg, Inner Hebrides / Geological Society, London, Special Publications, 62:145-154, doi:10.1144/GSL.SP.1992.062.01.12 --- P. J. Hamilton, A. E. Fallick, J. E. Andrews, and D. J. Whitford: Middle Jurassic clay-minerals from the Minch Basin: isotopic tracing of provenance and post-depositional alteration / Geological Society, London, Special Publications, 62:155-158, doi:10.1144/GSL.SP.1992.062.01.13 --- Ben Lowden, Sharon Braley, Andrew Hurst, and Jonathan Lewis: Sedimentological studies of the Cretaceous Lochaline Sandstone, NW Scotland / Geological Society, London, Special Publications, 62:159-162, doi:10.1144/GSL.SP.1992.062.01.14 --- Richard W. England: The role of Palaeocene magmatism in the tectonic evolution of the Sea of the Hebrides Basin: implications for basin evolution on the NW Seaboard / Geological Society, London, Special Publications, 62:163-174, doi:10.1144/GSL.SP.1992.062.01.15 --- Cherry L. E. Lewis, Andrew Carter, and Anthony J. Hurford: Low-temperature effects of the Skye Tertiary intrusions on Mesozoic sediments in the Sea of Hebrides Basin / Geological Society, London, Special Publications, 62:175-188, doi:10.1144/GSL.SP.1992.062.01.16 --- Onshore and Offshore North of Ireland --- W. I. Mitchell: The origin of Upper Palaeozoic sedimentary basins in Northern Ireland and relationships with the Canadian Maritime Provinces / Geological Society, London, Special Publications, 62:191-202, doi:10.1144/GSL.SP.1992.062.01.17 --- M. E. Philcox, H. Baily, G. Clayton, and G. D. Sevastopulo: Evolution of the Carboniferous Lough Allen Basin, Northwest Ireland / Geological Society, London, Special Publications, 62:203-215, doi:10.1144/GSL.SP.1992.062.01.18 --- J. O. Buckman: Palaeoenvironment of a Lower Carboniferous sandstone succession northwest Ireland: ichnological and sedimentological studies / Geological Society, London, Special Publications, 62:217-241, doi:10.1144/GSL.SP.1992.062.01.19 --- W. H. Wang: Origin of reddening and secondary porosity in Carboniferous sandstones, Northern Ireland / Geological Society, London, Special Publications, 62:243-254, doi:10.1144/GSL.SP.1992.062.01.20 --- David Naylor: The post-Variscan history of ireland / Geological Society, London, Special Publications, 62:255-275, doi:10.1144/GSL.SP.1992.062.01.21 --- Robert J. McCaffrey and Noel McCann: Post-Permian basin history of northeast Ireland / Geological Society, London, Special Publications, 62:277-290, doi:10.1144/GSL.SP.1992.062.01.22 --- M. R. Dobson and R. J. Whittington: Aspects of the geology of the Malin Sea area / Geological Society, London, Special Publications, 62:291-311, doi:10.1144/GSL.SP.1992.062.01.23 --- Offshore West and South of Ireland --- Stephen Trueblood: Petroleum geology of the Slyne Trough and adjacent basins / Geological Society, London, Special Publications, 62:315-326, doi:10.1144/GSL.SP.1992.062.01.24 --- Nicky White, Michael Tate, and John-Joe Conroy: Lithospheric stretching in the Porcupine Basin, west of Ireland / Geological Society, London, Special Publications, 62:327-331, doi:10.1144/GSL.SP.1992.062.01.25 --- John G. Moore: A syn-rift to post-rift transition sequence in the Main Porcupine Basin, offshore western Ireland / Geological Society, London, Special Publications, 62:333-349, doi:10.1144/GSL.SP.1992.062.01.26 --- Patrick M. Shannon: Early Tertiary submarine fan deposits in the Porcupine Basin, offshore Ireland / Geological Society, London, Special Publications, 62:351-373, doi:10.1144/GSL.SP.1992.062.01.27 --- Michael P. Tate: The Clare Lineament: a relic transform fault west of Ireland / Geological Society, London, Special Publications, 62:375-384, doi:10.1144/GSL.SP.1992.062.01.28 --- A. H. Ruffell and M. P. Coward: Basement tectonics and their relationship to Mesozoic megasequences in the Celtic Seas and Bristol Channel area / Geological Society, London, Special Publications, 62:385-394, doi:10.1144/GSL.SP.1992.062.01.29 --- The Atlantic Seaboard Beyond the British Isles --- S. P. Srivastava and J. Verhoef: Evolution of Mesozoic sedimentary basins around the North Central Atlantic: a preliminary plate kinematic solution / Geological Society, London, Special Publications, 62:397-420, doi:10.1144/GSL.SP.1992.062.01.30 --- A. G. Doré: Synoptic palaeogeography of the Northeast Atlantic Seaway: late Permian to Cretaceous / Geological Society, London, Special Publications, 62:421-446, doi:10.1144/GSL.SP.1992.062.01.31 --- Excursion Guide --- John Parnell, Bryan Monson, and Jim Buckman: Excursion Guide: Basins and petroleum geology in the north of Ireland / Geological Society, London, Special Publications, 62:449-464, doi:10.1144/GSL.SP.1992.062.01.32
    Pages: Online-Ressource (VIII, 470 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 0903317761
    URL: https://sp.lyellcollection.org/content/62/1
    Language: English
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  • 2
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    Evaluation of Boulder Deposits Linked to Late Neogene Hurricane Events (2022)
    MDPI - Multidisciplinary Digital Publishing Institute
    Details
    Publication Date: 2024-03-27
    Description: Contributions in this collection discuss storm deposits dating from Neogene time between 23 and 1.8 million years ago, as well as the last 1.8 million years, including the Pleistocene and Holocene. As today, past hurricane events were responsible for the erosion of rocky shorelines due to the impact of storm waves, in addition to flood deposits due to heavy rainfall after big storms, resulting in landfall. The former typically resulted in coastal boulder deposits (CBDs) and the latter in coastal outwash deposits (CODs). Study locations covered by this treatment include three within the confines of Mexico’s Gulf of California and three in the northeast Atlantic Ocean, including the Canary Islands and Azores, as well as the coast of Norway. Rock types canvassed in these studies are dominated by igneous rocks that include surface flows such as andesite and basalt as well as surface exposures of plutonic rocks that originated deep below the surface such as granite and near-mantle rocks like low-grade chromite. These rock types reflect a range in rock density, which has an effect on the ability of storm waves to degrade rocky shores in the production of CBDs. The site-specific studies in this collection also share an application treating the shape of boulders resulting from shore erosion. The collection is introduced by a survey covering Neogene CODs registered in the geological literature and a concluding paper focused on the use of satellite images as a means for detecting previously unrecognized coastal storm deposits.
    Keywords: bibliography ; large clasts ; Miocene ; Pliocene ; rocky shore ; storm ; tsunami ; barrier boulder deposits ; hurricane storm surge ; hydrodynamic equation ; Gulf of California (Mexico) ; remote sensing ; bouldering tourism ; Iberian Peninsula ; Mediterranean ; Indonesia ; Central America ; coastal boulder deposits ; storm surge ; hydrodynamic equations ; Holocene ; Pleistocene ; MIS 5e (Marine Isotope Substage 5e) ; NE Atlantic Ocean ; storm waves ; western North America ; coastal storm deposits ; high-latitude settings ; upper pleistocene ; marine isotope substage 5e ; North Atlantic Ocean ; coastal erosion ; Marine Isotope Substage 5e ; Gulf of California ; n/a ; thema EDItEUR::G Reference, Information and Interdisciplinary subjects::GP Research and information: general
    Language: English
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  • 3
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    Improving total field geomagnetic secular variation modeling from a new set 3 of cross-over marine data (2014)
    Elsevier Science Limited
    Details
    Publication Date: 2021-06-22
    Description: A new set of cross-over marine data has been used to generate a regional model for the secular variation of the total geomagnetic field, showing the potential of the suggested approach for gaining a better knowledge of the field over oceanic regions. The model, which is valid for the Northern Atlantic region during the temporal interval 1960–2000, was obtained using spherical cap harmonic analysis (SCHA) in space and penalized splines in time. The maximum spatial expansion is equivalent to degree 9 in ordinary spherical harmonic analysis. Annual mean intensity data from different geomagnetic observatories have been used to improve the spatial and temporal resolution of the original dataset. Results indicate that the regional model improves, in terms of the root mean square error, the prediction given by the 11th generation of IGRF and CM4 global models, especially for the geomagnetic observatories considered. We also provide the uncertainty of the model coefficients and the secular variation prediction given by a bootstrap algorithm. The model is available in the EarthRef. org Digital Archive at http://earthref.org/ERDA/1728/.
    Description: Published
    Description: 21-31
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: JCR Journal
    Description: restricted
    Keywords: Geomagnetism ; Secular variation ; Regional modeling ; North Atlantic Ocean ; Spherical cap harmonic analysis ; Geomagnetic marine data ; 04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals ; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies ; 04. Solid Earth::04.05. Geomagnetism::04.05.05. Main geomagnetic field ; 04. Solid Earth::04.05. Geomagnetism::04.05.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Report on a shore collecting trip to the Azores (12 September-1 November 1979), including a list of collecting stations [CANCAP-Project] (1981)
    In:  Various articles (0523-7904) vol.61 (1981) p.1
    Details
    Publication Date: 2018-08-14
    Keywords: oceanography ; zoogeography ; taxonomy ; collecting stations ; faunistic assemblages ; list ; Canary Islands ; Archipelago of Cape Verde ; Archipelago of Madeira ; Archipelago of the Azores ; North Africa ; North Atlantic Ocean ; CANCAP-Project
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 5
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    Report of the First Meeting of the Climate Change Working Group 11-13 May 2011, Saly, Senegal. (2015)
    Project “Protection of the Canary Current Large Marine Ecosystem” | Dakar, Sénégal
    Details
    Publication Date: 2021-01-30
    Description: La première réunion du Comité de Pilotage du projet CCLME qui s'est tenue à Dakar, au Sénégal, le 4 novembre 2010 s’était accordée sur l’établissement de six groupes de travail techniques afin d’aider le processus de développement d'une Analyse Diagnostique Transfrontalière (ADT) et l'élaboration d'un Plan d'Action Stratégique (PAS) pour le CCLME. La réunion a également adopté leurs termes de référence. En outre, il a été convenu que le projet CCLME et les pays participants contribueraient au soutien et au renforcement des deux groupes de travail du COPACE sur l'évaluation des stocks des ressources démersales et pélagiques. La première réunion du Groupe de Travail sur les changements climatiques s'est tenue à Saly, au Sénégal, du 11 au 13 mai 2011. Les membres du groupe de travail ont été nommés par les pays membres et les institutions partenaires du CCLME. L'objectif global de la réunion était pour le groupe de travail de se mettre d'accord sur les grandes lignes d'un document sur les impacts du changement climatique et les stratégies d'adaptation et d'atténuation pour le CCLME, d’ identifier des activités de projets potentiels pour traiter des questions de changement climatique identifiées, d'attribuer des responsabilités au sein du groupe et de s'entendre sur un plan de travail pour la période 2011-2012 en tenant compte de la date prévue pour l’adoption de l’ADT (novembre 2012). Mme Isabelle Niang, coordonnatrice régionale du projet « Adaptation aux Changements Climatiques et Côtiers en Afrique de l’Ouest (ACCC), a été élue Présidente du groupe de travail. Les représentants des pays participants et des partenaires du CCLME ont présenté les principales questions liées au changement climatique, les principales activités entreprises pour y répondre, les questions qui restent à traiter et les stratégies proposées pour minimiser les effets négatifs du changement climatique sur les ressources et les écosystèmes marins en fonction de l'avis de leur pays ou de leur organisation. Deux groupes de travail ont été formés afin d'identifier les questions prioritaires et leurs causes et de recommander des domaines d'intervention relatifs aux impacts du changement climatique sur les ressources marines vivantes et sur la biodiversité, les habitats et la qualité de l'eau dans la zone du CCLME. Les groupes de travail ont défini un certain nombre de domaines prioritaires d'intervention nécessitant des fonds supplémentaires. Il s’agit des besoins de systèmes d'observation améliorés; d’une analyse et de la modélisation des données existantes; de la cartographie de la vulnérabilité des zones prioritaires pour le CCLME; de l’examen et du renforcement des Plans d'Action Nationaux pour l’Adaptation (PANA) en ce qui concerne la pêche ; de la restauration de la mangrove/des sources d'énergie alternatives. La réunion a également convenu d'un projet de plan pour le document sur les impacts du changement climatique et les stratégies d'adaptation et d'atténuation pour le CCLME ainsi que d'un plan de travail 2011-2012 pour le groupe de travail, avec des responsabilités définies.
    Description: The First CCLME Project Steering Committee Meeting that was held in Dakar, Senegal, the 4th of November 2010, agreed on the establishment of six CCLME technical working groups to assist the development process of a Transboundary Diagnostic Analysis (TDA) and the elaboration of a Strategic Action Plan (SAP) for the CCLME. The meeting also adopted their terms of references. In addition, it was agreed that the CCLME project and the participating countries would contribute to the maintenance and strengthening of two CECAF working groups on stock assessment of demersal and pelagic resources. The First Meeting of the Climate Change Working Group was held in Saly, Senegal from 11th to 13th of May 2011. The members of the working group had been nominated by the CCLME participating countries and partner institutions. The overall aim of the meeting was for the working group to agree on the outline of a document on climate change impacts and adaptation and mitigation strategies for the CCLME, to identify suitable potential project activities to address identified climate change issues, to assign responsibilities within the group and to agree on a work plan for the period 2011-2012 taking into consideration the expected date for the adoption of the TDA (November 2012). Ms Isabelle Niang, Regional coordinator of the project “Adaptation to Climate and Coastal Change in West Africa” (ACCC), was elected Chairperson of the working group. The CCLME participating countries and the partner representatives presented the main climate change issues, the main activities undertaken to address them, issues that remain to be addressed and suggested strategies to minimize negative effects of climate change on marine resources and ecosystems according to the view of their country or organization. Two groups were formed in order to identify priority issues and their causes and recommended domains of intervention regarding climate change impacts on marine living resources; and on biodiversity, habitat and water quality in the CCLME area. The working groups defined a number of priority areas of intervention in need of additional funds. These focused on the need for improved observation systems; further analysis and modelling of existing data; vulnerability mapping in priority areas for the CCLME; review and strengthening of National Adaptation Plans of Action (NAPAs) with regards to fisheries; and mangrove restoration / alternative energy sources. The meeting also agreed on a draft outline for the document on climate change impacts and adaptation and mitigation strategies for the CCLME as well as a 2011-2012 work plan for the working group with responsibilities assigned.
    Description: Fonds pour l’Environnement Mondial (FEM); co-financement despays participants et d’autres partenaires. Les partenaires actuels sont: l’Agence Française de Développement (AFD), la Commission Sous-Régionale des Pêches (CSRP), le projet EAF-Nansen, l’Administration Nationale des Océans et de l’Atmosphère (NOAA) des États-Unis d’Amérique, le Programme Régional de Conservation de la Zone Côtière et Marine en Afrique de l’Ouest (PRCM), l’Agence Suédoise de Coopération Internationale au Développement (SIDA) et WageningenInternational.
    Description: L’Organisation des Nations Unies pour l’alimentation et l’agriculture (FAO) et le Programme des Nations Unies pour l’Environnement (PNUE) sont les agences FEM pour la réalisation du projet CCLME. CCLME ou Canary Current Large Marine Ecosystem
    Description: Published
    Description: changement climatique
    Description: frontière
    Description: ressource pélagique
    Description: ressource demersale
    Description: mangrove
    Description: dégradation
    Description: sédimentation
    Description: eau
    Keywords: Changement climatique ; Climatic changes ; Boundary currents ; Pelagic fisheries ; Demersal fisheries ; Water resources ; Salinity ; Sedimentation ; Reefs (coral) ; Habitat degradation
    Repository Name: AquaDocs
    Type: Report , Not Known
    Format: 60pp.
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  • 6
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    Rapid dispersal of a hydrothermal plume by turbulent mixing (2010)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 57 (2010): 931-945, doi:10.1016/j.dsr.2010.04.010.
    Description: The water column imprint of the hydrothermal plume observed at the Nibelungen field (8°18' S 13°30' W) is highly variable in space and time. The off-axis location of the site, along the southern boundary of a non-transform ridge offset at the joint between two segments of the southern Mid-Atlantic Ridge, is characterized by complex, rugged topography, and thus favorable for the generation of internal tides, subsequent internal wave breaking, and associated vertical mixing in the water column. We have used towed transects and vertical profiles of stratification, turbidity, and direct current measurements to investigate the strength of turbulent mixing in the vicinity of the vent site and the adjacent rift valley, and its temporal and spatial variability in relation to the plume dispersal. Turbulent diffusivities Kp were calculated from temperature inversions via Thorpe scales. Heightened mixing (compared to open ocean values) was observed in the whole rift valley within an order of Kp around 10-3 m2 s-1. The mixing close to the vent site was even more elevated, with an average of Kp = 4 x 10-2 m2 s-1. The mixing, as well as the flow field, exhibited a strong tidal cycle, with strong currents and mixing at the non-buoyant plume level during ebb flow. Periods of strong mixing were associated with increased internal wave activity and frequent occurrence of turbulent overturns. Additional effects of mixing on plume dispersal include bifurcation of the particle plume, likely as a result of the interplay between the modulated mixing strength and current speed, as well as high frequency internal waves in the effluent plume layer, possibly triggered by the buoyant plume via nonlinear interaction with the elevated background turbulence or penetrative convection.
    Description: This work was supported by the Priority Program SPP1144 of the Deutsche Forschungsgemeinschaft; this is SPP 1144 contribution number 51. Funding for the ABE team from WHOI was provided by Grant # OE-2006-218 from NOAA's Ocean Exploration Program; funding for the MAPR work was provided by NOAA's Vents Program.
    Keywords: Physical oceanography ; Hydrothermal vents ; Diapycnal mixing ; Plume dispersal ; Mid-Atlantic Ridge ; Rift valleys
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 7
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    On the role of eddies and surface forcing in the heat transport and overturning circulation in marginal seas (2011)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2011. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 24 (2011): 4844–4858, doi:10.1175/2011JCLI4130.1.
    Description: The factors that determine the heat transport and overturning circulation in marginal seas subject to wind forcing and heat loss to the atmosphere are explored using a combination of a high-resolution ocean circulation model and a simple conceptual model. The study is motivated by the exchange between the subpolar North Atlantic Ocean and the Nordic Seas, a region that is of central importance to the oceanic thermohaline circulation. It is shown that mesoscale eddies formed in the marginal sea play a major role in determining the mean meridional heat transport and meridional overturning circulation across the sill. The balance between the oceanic eddy heat flux and atmospheric cooling, as characterized by a nondimensional number, is shown to be the primary factor in determining the properties of the exchange. Results from a series of eddy-resolving primitive equation model calculations for the meridional heat transport, overturning circulation, density of convective waters, and density of exported waters compare well with predictions from the conceptual model over a wide range of parameter space. Scaling and model results indicate that wind effects are small and the mean exchange is primarily buoyancy forced. These results imply that one must accurately resolve or parameterize eddy fluxes in order to properly represent the mean exchange between the North Atlantic and the Nordic Seas, and thus between the Nordic Seas and the atmosphere, in climate models.
    Description: This study was supported by the National Science Foundation under Grants OCE-0726339 and OCE-0850416.
    Keywords: Eddies ; Forcing ; Meridional overturning circulation ; Transport ; North Atlantic Ocean ; Seas/gulfs/bays
    Repository Name: Woods Hole Open Access Server
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  • 8
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    Energy transfer from high-shear, low-frequency internal waves to high-frequency waves near Kaena Ridge, Hawaii (2012)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2012. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 42 (2012): 1524–1547, doi:10.1175/JPO-D-11-0117.1.
    Description: Evidence is presented for the transfer of energy from low-frequency inertial–diurnal internal waves to high-frequency waves in the band between 6 cpd and the buoyancy frequency. This transfer links the most energetic waves in the spectrum, those receiving energy directly from the winds, barotropic tides, and parametric subharmonic instability, with those most directly involved in the breaking process. Transfer estimates are based on month-long records of ocean velocity and temperature obtained continuously over 80–800 m from the research platform (R/P) Floating Instrument Platform (FLIP) in the Hawaii Ocean Mixing Experiment (HOME) Nearfield (2002) and Farfield (2001) experiments, in Hawaiian waters. Triple correlations between low-frequency vertical shears and high-frequency Reynolds stresses, uiw∂Ui/∂z, are used to estimate energy transfers. These are supported by bispectral analysis, which show significant energy transfers to pairs of waves with nearly identical frequency. Wavenumber bispectra indicate that the vertical scales of the high-frequency waves are unequal, with one wave of comparable scale to that of the low-frequency parent and the other of much longer scale. The scales of the high-frequency waves contrast with the classical pictures of induced diffusion and elastic scattering interactions and violates the scale-separation assumption of eikonal models of interaction. The possibility that the observed waves are Doppler shifted from intrinsic frequencies near f or N is explored. Peak transfer rates in the Nearfield, an energetic tidal conversion site, are on the order of 2 × 10−7 W kg−1 and are of similar magnitude to estimates of turbulent dissipation that were made near the ridge during HOME. Transfer rates in the Farfield are found to be about half the Nearfield values.
    Description: This work was supported by the National Science Foundation and the Office of Naval Research.
    Description: 2013-03-01
    Keywords: Diapycnal mixing ; Energy transport ; Internal waves ; Nonlinear dynamics ; Ship observations ; Spectral analysis/models/distribution
    Repository Name: Woods Hole Open Access Server
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  • 9
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    Parametric subharmonic instability of the internal tide at 29°N (2013)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2013. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 43 (2013): 17–28, doi:10.1175/JPO-D-11-0108.1.
    Description: Observational evidence is presented for transfer of energy from the internal tide to near-inertial motions near 29°N in the Pacific Ocean. The transfer is accomplished via parametric subharmonic instability (PSI), which involves interaction between a primary wave (the internal tide in this case) and two smaller-scale waves of nearly half the frequency. The internal tide at this location is a complex superposition of a low-mode waves propagating north from Hawaii and higher-mode waves generated at local seamounts, making application of PSI theory challenging. Nevertheless, a statistically significant phase locking is documented between the internal tide and upward- and downward-propagating near-inertial waves. The phase between those three waves is consistent with that expected from PSI theory. Calculated energy transfer rates from the tide to near-inertial motions are modest, consistent with local dissipation rate estimates. The conclusion is that while PSI does befall the tide near a critical latitude of 29°N, it does not do so catastrophically.
    Description: This work was sponsored by NSF OCE 04-25283.
    Description: 2013-07-01
    Keywords: Diapycnal mixing ; Internal waves ; Nonlinear dynamics
    Repository Name: Woods Hole Open Access Server
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  • 10
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    Absolute velocity along the AR7W section in the Labrador Sea (2013)
    Elsevier B.V.
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V., 2012. The definitive version was published in Deep Sea Research Part I: Oceanographic Research Papers 72 (2013): 72–87, doi:10.1016/j.dsr.2012.11.005.
    Description: Nearly every spring since 1990, hydrographic data have been collected along a section in the Labrador Sea known as AR7W. Since 1995, lowered acoustic doppler current profiler (LADCP) data have also been collected. In this work we use data from six of these sections, spanning the time period 1995 through 2008, to determine absolute velocity across AR7W and analyze the main features of the general circulation in the area. We find that absolute velocity fields are characterized by strong, nearly barotropic flows all along the section, meaning there is no “level of no motion” for geostrophic velocity calculations. There is strong variability from year to year, especially in the strength of the boundary currents at each end; nevertheless, combining data from.all 6 sections yields a well-organized velocity field resembling that presented by Pickart and Spall (2007), except that our velocities tend to be stronger: there is a cyclonic boundary current system with offshore recirculations at both ends of the line; the interior is filled with virtually uniform, top-to-bottom bands of velocity with alternating signs. At the southwestern end of the section, the LADCP data reveal a dual core of the Labrador Current at times when horizontal resolution is adequate. At the northeastern end, the location of the recirculation offshore of the boundary current is bimodal, and hence the apparent width of the boundary current is bimodal as well. In the middle of the section, we have found a bottom current carrying overflow waters along the Northwest Atlantic Mid-Ocean Channel, suggesting one of various possible fast routes for those waters to reach the central Labrador Sea. We have used the hydrographic data to compute geostrophic velocities, referenced to the LADCP profiles, as well as to compute ocean heat transport across AR7W for four of our sections. For all but one year, these fluxes are comparable to the mean air–sea heat flux that occurs between AR7W and Davis Strait from December to May (O(50–80 TW)), and much larger than the annual average values (O(10–20 TW)).
    Description: This material is based upon work supported by the National Science Foundation under Grant No. OCE-0622640. Igor Yashayaev is supported by the ocean climate monitoring program of the Department of Fisheries and Oceans Canada.
    Keywords: Labrador Sea ; Boundary currents ; Lowered acoustic doppler current profiler ; Ocean heat transport ; Geostrophic velocity ; Deep ocean circulation ; Meridional overturning
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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