PO12C:
Deep and Abyssal Ocean Mixing: From Small-Scale Turbulence to the Large-Scale MOC II


Session ID#: 11494

Session Description:
Diapycnal mixing plays an important role in the Meridional Overturning Circulation (MOC). It is, for example, the primary mechanism by which bottom water is converted to lighter deep water to close the deep cell of the MOC. The enhancement of mixing over rough topography that has been observed affects our theories and simulations of ocean circulation. The many mechanisms of mixing, however, are not entirely understood or quantified. Furthermore the energy sources and boundary conditions for mixing will change with the climate, so mixing may play an important role in climate change. A chain of processes connects the energy sources to the scales of turbulence. Such processes include, but are not limited to, the cascade of energy through the internal wave field from wind and tidal forcing, shear instability and hydraulic jumps associated with topographic constrictions or descending overflows, and lee waves generated by geostrophic flow over rough topography. Abstracts are welcome on all individual aspects of this subject, as well as on studies connecting small scale processes to large scale energetics and circulation.
Primary Chair:  Ali Mashayek, Massachusetts Institute of Technology, Cambridge, MA, United States
Chairs:  James R Ledwell, WHOI, Woods Hole, MA, United States, James B Girton, University of Washington, Applied Physics Laboratory, Seattle, WA, United States and Glenn S Carter, University of Hawaii, Manoa, Honolulu, HI, United States
Moderators:  James B Girton, University of Washington, Applied Physics Laboratory, Seattle, WA, United States and Glenn S Carter, University of Hawaii at Manoa, Oceanography, Honolulu, HI, United States
Student Paper Review Liaison:  James B Girton, University of Washington, Applied Physics Laboratory, Seattle, WA, United States
Index Terms:

4532 General circulation [OCEANOGRAPHY: PHYSICAL]
4544 Internal and inertial waves [OCEANOGRAPHY: PHYSICAL]
4562 Topographic/bathymetric interactions [OCEANOGRAPHY: PHYSICAL]
4568 Turbulence, diffusion, and mixing processes [OCEANOGRAPHY: PHYSICAL]
Co-Sponsor(s):
  • PC - Past, Present and Future Climate
  • TP - Turbulent Processes

Abstracts Submitted to this Session:

PO12C-01
Spatial Analysis of Abyssal Temperature Variations Observed From the ALOHA Cabled Observatory and WHOTS Moorings (92256)
Roger Lukas1, Fernando Santiago-Mandujano2, Bruce M Howe2, Albert J Plueddemann3, Robert A Weller3, Robert Walter Deppe2, Nordeen G Larson4, David J Murphy5 and Richard Guenther4, (1)Univ Hawaii, Honolulu, HI, United States, (2)University of Hawaii at Manoa, Honolulu, HI, United States, (3)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (4)Sea Bird Electronics, Bellevue, WA, United States, (5)Seabird Electronics Inc, Bellevue, WA, United States
PO12C-02
Modification of Antarctic Origin Bottom Water in the Samoan Passage by Turbulent Mixing (90968)
Glenn S Carter1, Matthew H Alford2, James B Girton3, Gunnar Voet4, John Mickett3 and Jody M Klymak5, (1)University of Hawaii at Manoa, Oceanography, Honolulu, HI, United States, (2)Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States, (3)University of Washington, Applied Physics Laboratory, Seattle, WA, United States, (4)Scripps Institution of Oceanography, La Jolla, CA, United States, (5)University of Victoria, Victoria, BC, Canada
PO12C-03
Deep near-inertial waves (89868)
Kelly Pearson1, Glenn S Carter2, Gunnar Voet3, James B Girton4, Matthew H Alford3 and John Mickett4, (1)University of Hawaii at Manoa, Honolulu, HI, United States, (2)University of Hawaii at Manoa, Oceanography, Honolulu, HI, United States, (3)Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States, (4)University of Washington, Applied Physics Laboratory, Seattle, WA, United States
PO12C-04
Observed energy and momentum budget of a hydraulically controlled dense overflow in the Samoan Passage (91463)
Gunnar Voet1, Matthew H Alford2, James B Girton3, Glenn S Carter4, Jody M Klymak5, John Mickett3 and Kelly Pearson6, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States, (3)University of Washington, Applied Physics Laboratory, Seattle, WA, United States, (4)University of Hawaii at Manoa, Oceanography, Honolulu, HI, United States, (5)University of Victoria, Victoria, BC, Canada, (6)University of Hawaii at Manoa, Honolulu, HI, United States
PO12C-05
Flow Splitting in Numerical Simulations of Oceanic Dense-Water Outflows (90063)
Gustavo M Marques, National Center for Atmospheric Research, Climate and Global Dynamics, Boulder, CO, United States, Laurence Padman, Earth & Space Research, Corvallis, OR, United States and Tamay Özgökmen, University of Miami, Miami, FL, United States
PO12C-06
Overflow induced Turbulence in a Deep Ocean Channel  (87980)
Sandra Tippenhauer1, Torsten Kanzow2, Marcus Dengler3 and Tim Fischer3, (1)Alfred Wegener Institute, Climate Science - Physical Oceanography of the Polar Seas, Bremerhaven, Germany, (2)GEOMAR, Kiel, Germany, (3)GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
PO12C-07
Observations of a Diapycnal Shortcut to Adiabatic Upwelling of Antarctic Cirumpolar Deep Waters (89477)
Yueng Djern Lenn1, Jess Mead Silvester1, Jeff Polton2, Tom Philip Rippeth3 and Miguel Angel Morales Maqueda4, (1)Bangor University, Wales, School of Ocean Sciences, Menai Bridge, United Kingdom, (2)National Oceanography Center, Liverpool, United Kingdom, (3)Bangor University, School of Ocean Sciences, Bangor, Wales, United Kingdom, (4)Newcastle University, Newcastle upon Tyne, United Kingdom
PO12C-08
Abyssal Circulation in the Panama Basin Driven by Geothermal Fluxes? (90108)
Miguel Angel Morales Maqueda1,2, Donata Banyte1, David Smeed3, Richard W Hobbs4 and Alex Megann3, (1)Newcastle University, School of Marine Science and Technology, Newcastle upon Tyne, United Kingdom, (2)National Oceanography Centre, Marine Physics and Ocean Climate, Liverpool, United Kingdom, (3)National Oceanography Centre, Southampton, United Kingdom, (4)University of Durham, Department of Earth Sciences, Durham, United Kingdom
See more of: Physical Oceanography/Ocean Circulation