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  • 1
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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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  • 2
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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
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  • 3
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    Coherence of western boundary pressure at the RAPID WAVE Array : boundary wave adjustments or Deep Western Boundary Current advection? (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): 744–765, doi:10.1175/JPO-D-12-067.1.
    Description: This study investigates the coherence between ocean bottom pressure signals at the Rapid Climate Change programme (RAPID) West Atlantic Variability Experiment (WAVE) array on the western North Atlantic continental slope, including the Woods Hole Oceanographic Institution Line W. Highly coherent pressure signals propagate southwestward along the slope, at speeds in excess of 128 m s−1, consistent with expectations of barotropic Kelvin-like waves. Coherent signals are also evidenced in the smaller pressure differences relative to 1000-m depth, which are expected to be associated with depth-dependent basinwide meridional transport variations or an overturning circulation. These signals are coherent and almost in phase for all time scales from 3.6 years down to 3 months. Coherence is still seen at shorter time scales for which group delay estimates are consistent with a propagation speed of about 1 m s−1 over 990 km of continental slope but with large error bounds on the speed. This is roughly consistent with expectations for propagation of coastally trapped waves, though somewhat slower than expected. A comparison with both Eulerian currents and Lagrangian float measurements shows that the coherence is inconsistent with a propagation of signals by advection, except possibly on time scales longer than 6 months.
    Description: This work was funded by the U.K. Natural Environment Research Council. Sofia Olhede was supported by EPSRC Grant EP/I005250/1. Initial observations at StationW(2001–04) were made possible by a grant from the G. Unger Vetlesen Foundation and support from the Woods Hole Oceanographic Institution. Since 2004, the Line W program has been supported by the U.S. National Science Foundation with supplemental contribution from WHOIs Ocean and Climate Change Institute.
    Description: 2013-10-01
    Keywords: Atlantic Ocean ; Boundary currents ; Meridional overturning circulation ; Pressure ; Waves, oceanic ; In situ oceanic observations
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 4
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    Evolution of the freshwater coastal current at the southern tip of Greenland (2018)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2018. 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 48 (2018): 2127-2140, doi:10.1175/JPO-D-18-0035.1.
    Description: Shipboard hydrographic and velocity measurements collected in summer 2014 are used to study the evolution of the freshwater coastal current in southern Greenland as it encounters Cape Farewell. The velocity structure reveals that the coastal current maintains its identity as it flows around the cape and bifurcates such that most of the flow is diverted to the outer west Greenland shelf, while a small portion remains on the inner shelf. Taking into account this inner branch, the volume transport of the coastal current is conserved, but the freshwater transport decreases on the west side of Cape Farewell. A significant amount of freshwater appears to be transported off the shelf where the outer branch flows adjacent to the shelfbreak circulation. It is argued that the offshore transposition of the coastal current is caused by the flow following the isobaths as they bend offshore because of the widening of the shelf on the west side of Cape Farewell. An analysis of the potential vorticity shows that the subsequent seaward flux of freshwater can be enhanced by instabilities of the current. This set of circumstances provides a pathway for the freshest water originating from the Arctic, as well as runoff from the Greenland ice sheet, to be fluxed into the interior Labrador Sea where it could influence convection in the basin.
    Description: Funding for this project was provided by the National Science Foundation under Grant OCE-1259618.
    Description: 2019-03-11
    Keywords: Boundary currents ; Coastal flows ; Instability ; Ocean circulation ; Potential vorticity ; Transport
    Repository Name: Woods Hole Open Access Server
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  • 5
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    The East Greenland Coastal Current : structure, variability, and forcing (2008)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Elsevier B.V. , 2008. 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 Progress In Oceanography 78 (2008): 58-77, doi:10.1016/j.pocean.2007.09.006.
    Description: The subtidal circulation of the southeast Greenland shelf is described using a set of high-resolution hydrographic and velocity transects occupied in summer 2004. The main feature is the East Greenland Coastal Current (EGCC), a low-salinity, high-velocity jet with a wedge-shaped hydrographic structure characteristic of other surface buoyancydriven currents. The EGCC was observed along the entire Greenland shelf south of Denmark Strait, while the transect north of the strait showed only a weak shelf flow. This observation, in conjunction with water mass considerations and other supporting evidence, suggests that the EGCC is an inner branch of the East Greenland Current (EGC) that forms south of Denmark Strait. It is argued that bathymetric steering is the most likely reason why the EGC apparently bifurcates at this location. Repeat sections occupied at Cape Farewell between 1997 and 2004 show that the alongshelf wind stress can have a strong influence on the structure and strength of the EGCC and EGC on timescales of 2-3 days. Accounting for the wind-induced effects, the volume transport of the combined EGCC/EGC system is roughly constant (~2 Sv) over the study domain, from 68°N to Cape Farewell near 60°N. The corresponding freshwater transport increases by roughly 60% over this distance (59 to 96 mSv, referenced to a salinity of 34.8). This trend is consistent with a simple freshwater budget of the EGCC/EGC system that accounts for meltwater runoff, melting sea-ice and icebergs, and net precipitation minus evaporation.
    Description: This work was funded by the National Science Foundation grant OCE-0450658. DS was also partially supported by the Woods Hole Oceanographic Institution Academic Programs Office.
    Keywords: Coastal currents ; East Greenland Current ; Sea ice ; Boundary currents ; Arctic freshwater flux
    Repository Name: Woods Hole Open Access Server
    Type: Preprint
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  • 6
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    The western Arctic boundary current at 152°W : structure, variability, and transport (2010)
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © The Author(s), 2008. 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 II: Topical Studies in Oceanography 56 (2009): 1164-1181, doi:10.1016/j.dsr2.2008.10.014.
    Description: From August 2002 to September 2004 a high-resolution mooring array was maintained across the western Arctic boundary current in the Beaufort Sea north of Alaska. The array consisted of profiling instrumentation, providing a timeseries of vertical sections of the current. Here we present the first-year velocity measurements, with emphasis on the Pacific water component of the current. The mean flow is characterized as a bottom-intensified jet of O(15 cm s-1) directed to the east, trapped to the shelfbreak near 100 m depth. Its width scale is only 10-15 km. Seasonally the flow has distinct configurations. During summer it becomes surface-intensified as it advects buoyant Alaskan Coastal Water. In fall and winter the current often reverses (flows westward) under upwelling-favorable winds. Between the storms, as the eastward flow re-establishes, the current develops a deep extension to depths exceeding 700 m. In spring the bottom-trapped flow advects winter-transformed Pacific water emanating from the Chukchi Sea. The year-long mean volume transport of Pacific Water is 0.13±0.08 Sv to the east, which is less than 20% of the long-term mean Bering Strait inflow. This implies that most of the Pacific water entering the Arctic goes elsewhere, contrary to expected dynamics and previous modeling results. Possible reasons for this are discussed. The mean Atlantic water transport (to 800 m depth) is 0.047±0.026 Sv, also smaller than anticipated.
    Description: AN was funded by the Swedish Research Council; RP, PF, and DT were funded by grant N00014-02-1-0317 of the Office of Naval Research.
    Keywords: Polar oceanography ; Shelf edge dynamics ; Boundary currents ; Volume transport ; Pacific Water ; Atlantic Water
    Repository Name: Woods Hole Open Access Server
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  • 7
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    The response of a weakly stratified layer to buoyancy forcing (2010)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2009. 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 39 (2009): 1060-1068, doi:10.1175/2008JPO3996.1.
    Description: The response of a weakly stratified layer of fluid to a surface cooling distribution is investigated with linear theory in an attempt to clarify recent numerical results concerning the sinking of cooled water in polar ocean boundary currents. A channel of fluid is forced at the surface by a cooling distribution that varies in the down-channel as well as the cross-channel directions. The resulting geostrophic flow in the central region of the channel impinges on its boundaries, and regions of strong downwelling are observed. For the parameters of the problem investigated, the downwelling occurs in a classical Stewartson layer but the forcing of the layer leads to an unusual relation with the interior flow, which is forced to satisfy the thermal condition on the boundary while the geostrophic normal flow in the interior is brought to rest in the boundary layer. As a consequence of the layer’s dynamics, the resulting long-channel flow exhibits a nonmonotonic approach to the interior flow, and the strongest vertical velocities are limited to the boundary layer whose scale is so small that numerical models resolve the region only with great difficulty. The analytical model presented here is able to reproduce key features of the previous nonlinear numerical calculations.
    Description: This research was supported in part by NSF Grant OCE 0451086.
    Keywords: Forcing ; Boundary currents ; Upwelling, downwelling
    Repository Name: Woods Hole Open Access Server
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  • 8
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    Eddy formation near the west coast of Greenland (2010)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 1992-2002, doi:10.1175/2008JPO3669.1.
    Description: This paper extends A. Bracco and J. Pedlosky’s investigation of the eddy-formation mechanism in the eastern Labrador Sea by including a more realistic depiction of the boundary current. The quasigeostrophic model consists of a meridional, coastally trapped current with three vertical layers. The current configuration and topographic domain are chosen to match, as closely as possible, the observations of the boundary current and the varying topographic slope along the West Greenland coast. The role played by the bottom-intensified component of the boundary current on the formation of the Labrador Sea Irminger Rings is explored. Consistent with the earlier study, a short, localized bottom-trapped wave is responsible for most of the perturbation energy growth. However, for the instability to occur in the three-layer model, the deepest component of the boundary current must be sufficiently strong, highlighting the importance of the near-bottom flow. The model is able to reproduce important features of the observed vortices in the eastern Labrador Sea, including the polarity, radius, rate of formation, and vertical structure. At the time of formation, the eddies have a surface signature as well as a strong circulation at depth, possibly allowing for the transport of both surface and near-bottom water from the boundary current into the interior basin. This work also supports the idea that changes in the current structure could be responsible for the observed interannual variability in the number of Irminger Rings formed.
    Description: AB is supported by WHOI unrestricted funds, JP by the National Science Foundation OCE 85108600, and RP by 0450658.
    Keywords: Eddies ; Boundary currents ; Quasigeostrophic models ; North Atlantic ; Coastlines
    Repository Name: Woods Hole Open Access Server
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  • 9
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    Radiating instability of a meridional boundary current (2010)
    American Meteorological Society
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 2294-2307, doi:10.1175/2008JPO3853.1.
    Description: A linear stability analysis of a meridional boundary current on the beta plane is presented. The boundary current is idealized as a constant-speed meridional jet adjacent to a semi-infinite motionless far field. The far-field region can be situated either on the eastern or the western side of the jet, representing a western or an eastern boundary current, respectively. It is found that when unstable, the meridional boundary current generates temporally growing propagating waves that transport energy away from the locally unstable region toward the neutral far field. This is the so-called radiating instability and is found in both barotropic and two-layer baroclinic configurations. A second but important conclusion concerns the differences in the stability properties of eastern and western boundary currents. An eastern boundary current supports a greater number of radiating modes over a wider range of meridional wavenumbers. It generates waves with amplitude envelopes that decay slowly with distance from the current. The radiating waves tend to have an asymmetrical horizontal structure—they are much longer in the zonal direction than in the meridional, a consequence of which is that unstable eastern boundary currents, unlike western boundary currents, have the potential to act as a source of zonal jets for the interior of the ocean.
    Description: This work was supported by the National Science Foundation through Grants OCE- 0423975 (MS, HH) and OCE-9901654 (JP). HH would like to thank her thesis committee as well as the MIT– WHOI Joint Program for partial financial support.
    Keywords: Instability ; Boundary currents
    Repository Name: Woods Hole Open Access Server
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  • 10
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    On the response of a buoyant plume to downwelling-favorable wind stress (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): 1083–1098, doi:10.1175/JPO-D-11-015.1.
    Description: Here, the response of a coastally trapped buoyant plume to downwelling-favorable wind forcing is explored using a simplified two-dimensional numerical model and a prognostic theory for the resulting width, depth, and density anomaly and along-shelf transport of the plume. Consistent with the numerical simulations, the analytical model shows that the wind causes mixing of the plume water and that the forced cross-shelf circulation can also generate significant deepening and surface narrowing, as well as increased along-shelf transport. The response is due to a combination of the purely advective process that leads to the steepening of the isopycnals and the entrainment of ambient water into the plume. The advective component depends on the initial plume geometry: plumes that have a large fraction of their total width in contact with the bottom (“bottom trapped”) suffer relatively small depth and width changes compared to plumes that have a large fraction of their total width detached from the bottom (“surface trapped”). Key theoretical parameters are Wγ/Wα, the ratio of the width of the plume detached from the bottom to the width of the plume in contact with it, and the ratio of the wind-generated mixed layer δe to the initial plume depth hp, which determines the amount of water initially entrained into the plume. The model results also show that the cross-shelf circulation can be strongly influenced by the wind-driven response in combination with the geostrophic shear of the plume. The continuous entrainment into the plume, as well as transient events, is also discussed.
    Description: This work has been supported by FONDECYT Grant 1070501. S. Lentz received support by theNational Science Foundation GrantOCE-0751554. C. Moffat had additional support from the National Science Foundation Office of Polar Programs through U.S. Southern Ocean GLOBEC Grants OPP 99-10092 and 06- 23223.
    Description: 2013-01-01
    Keywords: Baroclinic flows ; Boundary currents ; Coastal flows ; Upwelling/downwelling ; Wind ; Ocean models
    Repository Name: Woods Hole Open Access Server
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