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Flow Dynamics Around Downwelling Submarine Canyons : Volume 11, Issue 3 (23/05/2014)

By Spurgin, J. M.

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Book Id: WPLBN0004020779
Format Type: PDF Article :
File Size: Pages 56
Reproduction Date: 2015

Title: Flow Dynamics Around Downwelling Submarine Canyons : Volume 11, Issue 3 (23/05/2014)  
Author: Spurgin, J. M.
Volume: Vol. 11, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Allen, S. E., & Spurgin, J. M. (2014). Flow Dynamics Around Downwelling Submarine Canyons : Volume 11, Issue 3 (23/05/2014). Retrieved from

Description: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, British Columbia, Canada. Flow dynamics around a downwelling submarine canyon were analysed with the Massachusetts Institute of Technology general circulation model. Blanes Canyon (Northwest Mediterranean) was used for topographic and initial forcing conditions. Fourteen scenarios were modelled with varying forcing conditions. Rossby number and Burger number were used to determine the significance of Coriolis acceleration and stratification (respectively) and their impacts on flow dynamics. A new non-dimensional parameter (χ) was introduced to determine the significance of vertical variations in stratification. Some simulations do see brief periods of upwards displacement of water during the 10 day model period, however, the presence of the submarine canyon is found to enhance downwards advection of density in all model scenarios. High Burger numbers lead to negative vorticity and a trapped anticyclonic eddy within the canyon, as well as an increased density anomaly. Low Burger numbers lead to positive vorticity, cyclonic circulation and weaker density anomalies. Vertical variations in stratification affect zonal jet placement. Under the same forcing conditions, the zonal jet is pushed offshore in more uniformly stratified domains. Offshore jet location generates upwards density advection away from the canyon, while onshore jets generate downwards density advection everywhere within the model domain. Increasing Rossby values across the canyon axis, as well as decreasing Burger values, increase negative vertical flux at shelf break depth (150 m). Increasing Rossby numbers lead to stronger downwards advection of a passive tracer (nitrate) as well as stronger vorticity within the canyon. Results from previous studies were explained within this new dynamic framework.

Flow dynamics around downwelling submarine canyons

Adcroft, A., Hill, C., Campin, J.-M., Marshall, J., and Heimbach, P.: Overview of the formulation and numerics of the MIT GCM, in: Proceedings of the ECMWF seminar series on Numerical Methods, Recent developments in numerical methods for atmosphere and ocean modelling, 139–149, 2004.; Allen, S. E.: Topographically generated, subinertial flows within a finite length canyon, J. Phys. Oceanogr., 26, 1608–1632, 1996.; Allen, S. E., Vindeirinho, C., Thomson, R. E., Foreman, M. G., and Mackas, D. L.: Physical and biological processes over a submarine canyon during an upwelling event, Can. J. Fish. Aquat. Sci., 58, 671–684, 2001.; Alvarez, A., Tintoré, J., and Sabatés, A.: Flow modification and shelf-slope exchange induced by a submarine canyon off the northeast Spanish coast, J. Geophys. Res.-Oceans, 101, 12043–12055, doi:10.1029/95JC03554, 1996.; Ardhuin, F., Pinot, J.-M., and Tintoré, J.: Numerical study of the circulation in a steep canyon off the Catalan coast (western Mediterranean), J. Geophys. Res.-Oceans, 104, 11115–11135, doi:10.1029/1999JC900029, 1999.; Bosley, K. L., Lavelle, J. W., Brodeur, R. D., Wakefield, W. W., Emmett, R. L., Baker, E. T., and Rehmke, K. M.: Biological and physical processes in and around Astoria submarine canyon, Oregon, U}S{A, J. Marine Syst., 50, 21–37, 2004.; Boyer, D. L., Haidvogel, D. B., and Perenne, N.: Laboratory-numerical model comparisons of canyon flows: a parameter study, J. Phys. Oceanogr., 34, 1588–1609, 2004.; Company, J. B., Ramirez-Llodra, E., Sarda, F., Aguzzi, J., Puig, P., Canals, M., Calafat, A., Palanques, A., Sole, M., Sanchez-Vidal, A., Martin, J., Lastras, G., Tecchio, S., Koening, S., Fernandez-Arcaya, U., Mecho, A., and Fernandez, P.: Submarine canyons in the Catalan Sea (NW Mediterranean): megafaunal biodiversity patterns and anthropogenic threats, in: Mediterranean Submarine Canyons: Ecology and Governance, edited by: Wurtz, M., IUCN, Gland, Switzerland, Málaga, Spain, 133–144, 2012.; Dawe, J. T. and Allen, S. E.: Solution convergence of flow over steep topography in a numerical model of canyon upwelling, J. Geophys. Res.-Oceans, 115, C05008, doi:10.1029/2009JC005597, 2010.; Flexas, M. M., Boyer, D. L., Espino, M., Puigdefàbregas, J., Rubio, A., and Company, J. B.: Circulation over a submarine canyon in the NW Mediterranean, J. Geophys. Res.-Oceans, 113, doi:10.1029/2006JC003998, 2008.; Freeland, H. and Denman, K.: A topographically controlled upwelling center off southern Vancouver Island, J. Mar. Res., 40, 1069–1093, 1982.; Spurgin, J.: Flow dynamics around downwelling submarine canyons, Master's thesis, University of British Columbia, 2014.; Gregg, M. C., Hall, R. A., Carter, G. S., Alford, M. H., Lien, R.-C., Winkel, D. P., and Wain, D. J.: Flow and mixing in Ascension, a steep, narrow canyon, J. Geophys. Res.-Oceans, 116, C07016, doi:10.1029/2010JC006610, 2011.; Griffies, S. M. and Hallberg, R. W.: Biharmonic friction with a Smagorinsky-like viscosity for use in large-scale eddy-permitting ocean models, Mon. Weather Rev., 128, 2935–2946, 2000.; Hickey, B.: Coastal submarine canyons, in: Topographic Effects in the Ocean, SOEST Special publications, 95–110, 1995.; Jordi, A., Orfila, A., Basterretxea, G., and Tintoré, J.: Shelf-slope exchanges by frontal variability in a steep submarine canyon, Prog. Oceanogr., 66, 120–141, 2005.; Klinck, J. M.: Circulation near submarine canyons: a modeling study, J. Geophys. Res.-Oceans, 101, 1211–1223, doi:10.1029/95JC02901, 1996.; Le Souëf, K. E. and Allen, S. E.: Physical modeling of tidal resonance in a submarine canyon, J. Geophys. Res.-Oceans, 119, 1324–1343, &l


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