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):
  • 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:  Shaun Johnston, UCSD/SIO, La Jolla, CA, United States and Jody M Klymak, University of Victoria, Victoria, BC, Canada
Student Paper Review Liaison:  Ruth C Musgrave, Woods Hole Oceanographic Institution, Woods Hole, MA, United States

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, Den Burg, Netherlands
 
Wave-Topography Interaction and Impact on Oceanic Kinetic Energy Distribution (653958)
Cimarron Wortham, NorthWest Research Associates, Redmond, WA, United States
 
How variable is mixing efficiency in the abyss? (651947)
Takashi Ijichi1, Louis St Laurent2, Kurt L Polzin1 and John Merrill Toole3, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)Applied Physics Laboratory University of Washington, Seattle, WA, 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 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
 
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
 
Parameterizing nonhydrostatic lee wave drag with the lowest over-topping streamline (652180)
Eric Mayer, Stanford University, Civil and Environmental Engineering, Stanford, CA, United States and Oliver B Fringer, Stanford University, Stanford, 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, Australia, Maxim Nikurashin, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia, Andrew M Hogg, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia and Bernadette Sloyan, CSIRO Oceans and Atmosphere, Hobart, TAS, Australia
 
Submesocale eddies in the abyssal Southern Ocean (649103)
Maxim Nikurashin, University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia and Kaiwen Zheng, Ocean University of China, Qingdao, China
 
Flow Across Large Amplitude Topography: Bottom PV injection and Watermass Transformation (644624)
Miguel Jimenez-Urias, Johns Hopkins University, Earth and Planetary Sciences, Baltimore, MD, United States and LuAnne Thompson, University of Washington, School of Oceanography, Seattle, WA, United States
 
Forced Symmetric and Centrifugal Instability in the Bottom Boundary Layer (640942)
Jacob O Wenegrat, University of Maryland College Park, Atmospheric and Oceanic Science, College Park, MD, United States and Leif N Thomas, Stanford University, Stanford, CA, United States
 
Spatial and Temporal Patterns of Deep Dissipation Near Palau (652833)
Anna Simpson1, Jonathan D Nash1, Jennifer A MacKinnon2, Matthew Alford2, Gunnar Voet2, Harper L Simmons3, Conrad A Luecke4 and Jim Moum5, (1)Oregon State University, Corvallis, OR, United States, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)University of Alaska Fairbanks, Fairbanks, AK, United States, (4)NRC Postdoctoral Fellow at Naval Research Laboratory, Stennis Space Center, MS, United States, (5)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 Alford1, Jennifer A MacKinnon1, Jonathan D Nash2 and Gunnar Voet1, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Oregon State University, Corvallis, OR, 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
 
Multiscale interactions for Flow Encountering Abrupt Topography (656959)
Patrick Haley Jr1, Pierre F J Lermusiaux2, Chris Mirabito2 and Shaun Johnston3, (1)Harvard University, Cambridge, MA, United States, (2)Massachusetts Institute of Technology, Cambridge, MA, United States, (3)UCSD/SIO, La Jolla, CA, United States
 
Observations of Multi-layer Flow and Wake around Southern Palau (646105)
Celia Yun Ou, University of California San Diego, Scripps Institution of Oceanography, La Jolla, United States and Shaun Johnston, UCSD/SIO, La Jolla, CA, 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, 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. Yang4 and Sen Jan4, (1)National Cheng Kung University, Department of Hydraulic and Ocean Engineering, Tainan, Taiwan, (2)University of Florida, Department of Civil and Coastal Engineering, Ft Walton Beach, FL, United States, (3)IONTU Institute of Oceanography National Taiwan University, Taipei, Taiwan, (4)National Taiwan University, Institute of Oceanography, Taipei, Taiwan
 
Evolution of the Kuroshio-Induced Island Wake: Satellite Observations and Numerical Simulation (641161)
Po-Chun Hsu, Chung-Ru Ho, Chia-Ying Ho and Hung-Jen Lee, National Taiwan Ocean University, Department of Marine Environmental Informatics, Keelung, Taiwan
 
Bumpy topographic and Kuroshio impacts on the transbasin evolution of large-amplitude internal solitary wave in the northern South China Sea (644875)
Jieshuo Xie, Yuqi Wu, Yinghui He, Zhi-wu Chen, Jiexin Xu and Shuqun Cai, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
 
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 Watts1, Karen L Tracey2 and Kathleen A Donohue2, (1)University of Rhode Island, Narragansett, RI, United States, (2)Univ Rhode Island, Narragansett, RI, United States
 
Deep Circulation in the Colombian Caribbean and its Interaction with Bathymetric Features Close to La Guajira Peninsula and Nicaraguan Rise (657125)
Yuley Cardona1, Sergio Jaramillo2 and Manuela Guarin1, (1)Universidad Nacional de Colombia, Medellin, Medellin, Colombia, (2)Shell Houston, Houston, TX, 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