PS14A:
Multiscale Topographic Effects on Large-Scale Flow: From Wakes and Lee Waves to Small-Scale Turbulence and Mixing II Posters
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.
Co-Sponsor(s):
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, Dalhousie University, Oceanography, Halifax, NS, Canada
Primary Liaison: Shaun Johnston, UCSD/SIO, La Jolla, United States
Moderators: Shaun Johnston, UCSD/SIO, La Jolla, United States and Jody M Klymak, University of Victoria, Victoria, BC, Canada
Student Paper Review Liaison: Ruth C Musgrave, Dalhousie University, Oceanography, Halifax, NS, Canada
Abstracts Submitted to this Session:
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, Ocean Systems, Den Burg, Netherlands
How variable is mixing efficiency in the abyss? (651947)
Takashi Ijichi1, Louis St Laurent2, Kurt L Polzin3 and John Merrill Toole3, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)Applied Physics Laboratory, University of Washington, Seattle, United States, (3)Woods Hole Oceanographic Institution, Woods Hole, United States
Uncertainty quantification for lee wave drag due to spectral parameterization of the abyssal hill topography (650696)
Peiyun Zhu1, Eric Mayer2, Peter K Kitanidis3, Oliver B Fringer4 and Catherine Gorle2, (1)Stanford University, Civil and Environmental Engineering, Stanford, United States, (2)Stanford University, Civil and Environmental Engineering, Stanford, CA, United States, (3)Stanford University, Department of Civil and Environmental Engineering, Stanford, CA, United States, (4)Stanford University, Stanford, CA, United States
Tidally modulated uniform flow past a conical obstacle: a LES study (644206)
Pranav Suresh Puthan, University of California San Diego, La Jolla Shores, CA, United States, Masoud Jalali, University of California San Diego, La Jolla, CA, United States, Geno R Pawlak, University of California San Diego, Mechanical and Aerospace Engineering, La Jolla, CA, United States and Sutanu Sarkar, Univ California at San Diego, La Jolla, CA, United States
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, TAS, Australia, Maxim Nikurashin, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia, Andrew M Hogg, Australian National University and ARC Centre of Excellence for Climate Extremes, Research School of Earth Sciences, Canberra, ACT, Australia and Bernadette Sloyan, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Hobart, TAS, Australia
Spatial and Temporal Patterns of Deep Dissipation Near Palau (652833)
Anna Simpson1, Jonathan D Nash2, Jennifer A MacKinnon3, Matthew Alford4, Gunnar Voet3, Harper L Simmons5, Conrad A Luecke6 and Jim Moum7, (1)Oregon State University, Corvallis, OR, United States, (2)Oregon State University, Corvallis, United States, (3)Scripps Institution of Oceanography, La Jolla, United States, (4)University of California San Diego, Scripps Institution of Oceanography, San Diego, United States, (5)University of Alaska Fairbanks, Fairbanks, United States, (6)NRC Postdoctoral Fellow at Naval Research Laboratory, Stennis Space Center, MS, United States, (7)Oregon State University, College of Earth Ocean & Atmospheric Sciences, Corvalis, OR, United States
Examining Turbulence and Vortex Structures in the Wake of Velasco Reef Near Palau. (649506)
Bethan Wynne-Cattanach1, Matthew H Alford2, Jennifer A MacKinnon3, Jonathan D Nash4 and Gunnar Voet3, (1)Scripps Institution of Oceanography, UC San Diego, La Jolla, United States, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)Scripps Institution of Oceanography, La Jolla, United States, (4)Oregon State University, Corvallis, United States
Low-Frequency Currents Observed around the Velasco Reef off Northern Palau (644219)
William Teague1, Hemantha W Wijesekera2, David W Wang3 and Zack Hallock1, (1)SRR International, Inc., Riviera Beach, United States, (2)Naval Research Laboratory, Ocean Sciences, Stennis Space Center, MS, United States, (3)U.S. Naval Research Laboratory, Ocean Sciences, Stennis Space Center, 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, Department of Mechanical Engineering, Cambridge, MA, United States, Christopher Mirabito, Massachusetts Institute of Technology, Department of Mechanical Engineering, Cambridge, United States and Shaun Johnston, UCSD/SIO, La Jolla, United States
The Interaction of Large-Scale Yanai Waves with the Seychelles Plateau (652054)
Isabella Beatriz Arzeno-Soltero1, 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, Mechanical and Aerospace Engineering, La Jolla, CA, United States
Dynamics and Variability of Topography-induced Shear Instabilities in Western Boundary Currents (645165)
Julie Chen1, Xiao Yu2, Ming-Huei Chang3, Y. J. Yang3 and Sen Jan3, (1)National Cheng Kung University, Department of Hydraulic and Ocean Engineering, Tainan, Taiwan, (2)University of Florida, Department of Civil and Coastal Engineering, Gainesville, United States, (3)National Taiwan University, Institute of Oceanography, Taipei, Taiwan
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)IRD, LEGOS, Toulouse, France, (11)CNRS, Toulouse, France
LOCAL AND CIRCUMGLOBAL EFFECTS OF EDDY-INITIATED CROSS-FRONTAL EXCHANGE IN THE ANTARCTIC CIRCUMPOLAR CURRENT (653670)
D Randolph Watts, University of Rhode Island, Narragansett, RI, United States, Karen L Tracey, Univ Rhode Island, Narragansett, RI, United States and Kathleen A Donohue, Univ Rhode Island, Narragansett, United States
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
