PS13A:
Multiscale Topographic Effects on Large-Scale Flow: From Wakes and Lee Waves to Small-Scale Turbulence and Mixing I

Session ID#: 92535

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.
Co-Sponsor(s):
  • PL - Physical Oceanography: Mesoscale and Larger
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
Moderators:  Jody M Klymak, University of Victoria, Victoria, BC, Canada and Ruth C Musgrave, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Student Paper Review Liaison:  Shaun Johnston, UCSD/SIO, La Jolla, CA, United States

Abstracts Submitted to this Session:

The impact of the broad-shallow Seychelles Plateau into the Southwestern Tropical Indian Ocean 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-Soltero, University of California Irvine, Civil and Environmental Engineering, Irvine, CA, United States
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
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
Bottom boundary layer dynamics and vorticity generation on sloping three dimensional topography (648885)
Arjun Jagannathan, United States, Kaushik Srinivasan, Scripps Institute of Oceanography, La Jollla, CA, United States, James C McWilliams, University of California in Los Angeles, Los Angeles, United States, Maarten J Molemaker, UCLA, Los Angeles, CA, United States and Andrew Stewart, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, United States
Generation of lee waves and submesoscale vortices in the wake of the Charleston Bump (651033)
Jonathan Gula, Université de Bretagne Occidentale, Laboratoire d'Océanographie Physique et Spatiale (UBO, CNRS, Ifremer, IRD), Plouzané, 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
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 University, Corvallis, OR, 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
Interdependence of internal tide and lee wave generation at abyssal hills (637758)
Callum James Shakespeare, Australian National University, Research School of Earth Sciences, Canberra, Australia