PS006
Multiscale Topographic Effects on Large-Scale Flow: From Wakes and Lee Waves to Small-Scale Turbulence and Mixing
Session ID#: 84590
Session Description:
There has been a resurgence in research on stratified flow over topography in the ocean, with recent evidence suggesting its importance on the large-scale ocean circulation through topographic form drag, turbulence and mixing. The interaction of large-scale, low-frequency geostrophic currents with steep topography produces a rich submesoscale and mesoscale vorticity field that initiates a cascade of energy down to small scales and turbulence. Over more gentle topography, lee waves arise and may break nearby or propagate and eventually break elsewhere, leading to local and remote turbulence and mixing. Together, wakes and lee waves significantly impact the topographic form drag and play an important role in energy and momentum budgets of the low-frequency flow. Despite extensive research on stratified flow over topography, our ability to predict and parameterize oceanic flow at spatial scales comparable to the topography is lacking. This session solicits abstracts employing modeling, observations, or theory to link basin-scale flows to topographic lee waves/wake effects, thereby advancing the state of knowledge of (a) the science of flow at topography, boundary layers, and downscaling and (b) models and forecasts of the relevant processes.
Index Terms:
4520 Eddies and mesoscale processes [OCEANOGRAPHY: PHYSICAL]
4544 Internal and inertial waves [OCEANOGRAPHY: PHYSICAL]
4562 Topographic/bathymetric interactions [OCEANOGRAPHY: PHYSICAL]
Primary Chair: Shaun Johnston, Scripps Institution of Oceanography, La Jolla, CA, United States
Co-chairs: Jody M Klymak, University of Victoria, Victoria, BC, Canada and Ruth C Musgrave, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Primary Liaison: Shaun Johnston, UCSD/SIO, La Jolla, CA, United States
High-Resolution Turbulence Observations of Non-Tidal Stratified Flow Over a Steep Sill in the Baltic Sea (581241)
Julia Muchowski, Stockholm University, Geological Sciences, Stockholm, Sweden, Lars Umlauf, Leibniz Institute for Baltic Sea Research (IOW), Warnemuende, Germany, Lars Arneborg, Swedish Meteorological and Hydrological Institute, Oceanography Research Dept., Norrköping, Sweden, Elizabeth Frances Weidner, University of New Hampshire Main Campus, Durham, NH, United States, Peter Ludwig Holtermann, Leibniz Institute for Baltic Sea Research (IOW), Rostock, Germany, Jen-Ping Peng, Leibniz Institute for Baltic Sea Research (IOW), Physical Oceanography, Rostock, Germany, Christoph Humborg, Stockholm University, Baltic Sea Centre, Stockholm, Sweden and Christian Stranne, Stockholm University, Department of Geological Sciences, Stockholm, Sweden
Impacts of Lee Waves on the Southern Ocean Circulation and its Sensitivity to Wind Stress (638931)
Luwei Yang, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, Australia, Maxim Nikurashin, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia, Andrew M. Hogg, Australian National University, Canberra, ACT, Australia and Bernadette Sloyan, CSIRO Oceans and Atmosphere, Hobart, TAS, Australia
Tidally modulated uniform flow past a conical obstacle: a LES study (644206)
Pranav Suresh Puthan1, Masoud Jalali2, Geno R Pawlak2 and Sutanu Sarkar3, (1)University of California San Diego, La Jolla Shores, CA, United States, (2)University of California San Diego, La Jolla, CA, United States, (3)Univ California at San Diego, La Jolla, CA, United States
Low-Frequency Currents Observed around the Velasco Reef off Northern Palau (644219)
William Teague, NVision Solutions Inc, Diamondhead, United States, Hemantha W Wijesekera, Naval Research Laboratory, Ocean Sciences, Stennis Space Center, MS, United States, David W Wang, U.S. Naval Research Laboratory, Ocean Sciences, Stennis Space Center, MS, United States and Zack Hallock, NVision Solutions Inc., Diomondhead, MS, United States
Flow Across Large Amplitude Topography: Bottom PV injection and Watermass Transformation (644624)
Miguel Jimenez-Urias, Johns Hopkins University, Earth and Planetary Sciences, Balitmore, WA, United States and Luanne Thompson, University of Washington, School of Oceanography, Seattle, WA, United States
Dynamics and Variability of Topography-induced Shear Instabilities in Western Boundary Currents (645165)
Jia-Lin Chen1, Xiao Yu2, Ming-Huei Chang3, Y. J. Yang4 and Sen Jan4, (1)National Cheng Kung University, Department of Hydraulic and Ocean Engineering, Tainan, Taiwan, (2)University of Florida, Engineering School of Sustainable Infrastructure & Environment, Gainesville, FL, United States, (3)IONTU Institute of Oceanography National Taiwan University, Taipei, Taiwan, (4)National Taiwan University, Institute of Oceanography, Taipei, Taiwan
Observed deep anticyclonic cap and its geological effects over Caiwei Guyot (645513)
Weiqiang Wang, South China Sea Institute of Oceanology, Chinese Academy of Sciences, State Key Laboratory of Tropical Oceanography, Guangzhou 510301, China, Binbin Guo Sr., SCSIO South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China and Yeqiang Shu, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
The Deformation Radius with Bathymetry (645557)
Joseph H Lacasce, University of Oslo, Meteorology and Oceanography, Oslo, Norway and Sjoerd Groeskamp, Royal Netherlands Institute for Sea Research, Den Burg, Netherlands
LES Modelling of the Impact of the Topography on Large-scale Exchange Flow in the Strait of Gibraltar (646310)
Margaux Hilt1, Francis Auclair2, Lucie Bordois3, Franck Dumas4, Rachid Benshila5, Xavier Capet6, Laurent Debreu7, Florian Lemarié8, Swen Jullien9, Patrick Marchesiello10, Cyril Nguyen2 and Laurent Roblou11, (1)University Paul Sabatier Toulouse III, Laboratoire d'Aérologie, Toulouse Cedex 09, France, (2)Laboratoire d'Aérologie - Observatoire Midi Pyrénées, Toulouse, France, (3)SHOM, Brest, France, (4)Shom, HOM/REC, Brest, France, (5)CNRS, Paris Cedex 16, France, (6)LOCEAN, Paris Cedex 05, France, (7)INRIA Rhône-Alpes, Grenoble, France, (8)Univ. Grenoble Alpes, Inria, Grenoble, France, (9)Ifremer, Plouzané, France, (10)LEGOS, France, (11)CNRS, Toulouse, France
Observations of Broad-band Vorticity Generation around the Island of Palau (646383)
Kristin Zeiden1, Jennifer A MacKinnon1, Daniel L Rudnick1, Matthew Alford1, Gunnar Voet1 and Hemantha W Wijesekera2, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Naval Research Laboratory, Ocean Sciences, Stennis Space Center, MS, United States
The impact of the broad-shallow Seychelles Plateau into the Southwestern Tropical Indian circulation. (648324)
Alma CAROLINA Castillo-Trujillo, Scripps Institution of Oceanography, Oceanography, La Jolla, CA, United States; University of Hawaii at Manoa, Honolulu, CA, United States, Sarah N Giddings, Scripps Institution of Oceanography, La Jolla, CA, United States, Geno R Pawlak, University of California San Diego, La Jolla, CA, United States and Isabella Beatriz Arzeno, University of California, San Diego, Scripps Institution of Oceanography, San Diego, CA, United States
Bottom boundary layer dynamics and vorticity generation on sloping three dimensional topography (648885)
Arjun Jagannathan1, Kaushik Srinivasan2, James C McWilliams3, Maarten J Molemaker3 and Andrew Stewart4, (1)United States, (2)Scripps Institute of Oceanography, La Jollla, CA, United States, (3)UCLA, Los Angeles, CA, United States, (4)University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, United States
Examining Turbulence and Vortex Structures in the Wake of Velasco Reef Near Palau. (649506)
Bethan Wynne-Cattanach1, Matthew H Alford1, Jennifer A MacKinnon1, Jonathan D Nash2 and Gunnar Voet1, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Oregon State Univ, Corvallis, OR, United States
Uncertainty quantification for lee wave drag due to spectral parameterization of the abyssal hill topography (650696)
Peiyun Zhu1, Eric Mayer1, Peter K Kitanidis2, Oliver B Fringer3 and Catherine Gorle1, (1)Stanford University, Civil and Environmental Engineering, Stanford, CA, United States, (2)Stanford University, Department of Civil and Environmental Engineering, Stanford, CA, United States, (3)Stanford University, Stanford, CA, United States
Generation of lee waves and submesoscale vortices in the wake of the Charleston Bump (651033)
Jonathan Gula, University of Brest, Laboratoire d’Océanographie Physique et Spatiale, Brest, France, Charly de Marez, Laboratoire d'Océanographie Physique et Spatiale, Plouzané, France, Noe Lahaye, LOPS, IUEM, University of Brest, Brest, France, Tanya M Blacic, Montclair State Univ, Montclair, NJ, United States and Robert E Todd, Woods Hole Oceanographic Institution, Physical Oceanography, Woods Hole, MA, United States
How variable is mixing efficiency in the abyss? (651947)
Takashi Ijichi1, Louis St Laurent2, Kurt L Polzin1 and John Merrill Toole1, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)Applied Physics Laboratory University of Washington, Seattle, WA, United States
The Interaction of Large-Scale Yanai Waves with the Seychelles Plateau (652054)
Isabella Beatriz Arzeno1, Sarah N Giddings1, Geno R Pawlak2, Julie McClean1 and He Wang1, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)University of California San Diego, La Jolla, CA, United States
Observations of Lee Waves Generated by Topographic Form Drag on Tides and Low-Frequency Flow over a Tall Submarine Ridge near Palau (652100)
Gunnar Voet1, Matthew H Alford1, Jennifer A MacKinnon1 and Jonathan D Nash2, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Oregon State Univ, Corvallis, OR, United States
Spatial and Temporal Patterns of Deep Dissipation Near Palau (652833)
Anna Simpson1, Jonathan D Nash2, Jennifer A MacKinnon3, Matthew Alford3, Gunnar Voet3, Harper L Simmons4, Conrad A Luecke5 and Jim Moum6, (1)Oregon State University, Corvallis, OR, United States, (2)Oregon State Univ, Corvallis, OR, United States, (3)Scripps Institution of Oceanography, La Jolla, CA, United States, (4)University of Alaska Fairbanks, Fairbanks, AK, United States, (5)NRC Postdoctoral Fellow at Naval Research Laboratory, Stennis Space Center, MS, United States, (6)Oregon State University, College of Earth Ocean & Atmospheric Sciences, Corvalis, OR, United States
Multiscale interactions for Flow Encountering Abrupt Topography (656959)
Patrick Haley Jr, Harvard University, Cambridge, MA, United States, Pierre F J Lermusiaux, Massachusetts Institute of Technology, Cambridge, MA, United States, Chris Mirabito, Massachusetts Institute of Technology, MA, United States and Shaun Johnston, UCSD/SIO, La Jolla, CA, United States
Near-inertial surface currents at Palau: Island blocking, flow enhancement, and wake formation (657033)
Mika Natalie Siegelman1, Mark A Merrifield2, Eric Firing1, Ruth C Musgrave3, Jennifer A MacKinnon4 and Janet M Becker2, (1)University of Hawaii at Manoa, Department of Oceanography, Honolulu, HI, United States, (2)University of California San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, (3)Dalhousie University, Halifax, NS, Canada, (4)Scripps Institution of Oceanography, La Jolla, CA, United States
