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Southern Ocean Mixing Workshop

November 14-15, 2005

Mixing in the Southern Ocean appears to play a critical role in the global meridional overturning circulation (MOC). In the Southern Ocean, deep and intermediate waters are hypothesized to upwell along isopycnals. At the surface, these water masses are advected meridionally and transformed to create bottom water and SubAntarctic Mode Water, which in turn downwell along isopycnals. Since the primary current of the Southern Ocean, the ACC, is zonally connected, no mean geostrophic current can carry water meridionally along these mid-depth and upper-ocean isopycnal surfaces. The dominant mechanism for the meridional transport of mass, heat, and potential vorticity above the topography and below the wind driven Ekman layer at the latitude band of Drake Passage is thought to be quasi-geostrophic, mesoscale eddy motions. Diapycnal mixing processes might also support residual ageostrophic circulations that contribute to the Southern Ocean MOC, but also appear able to “short-circuit” the meridional fluxes associated with the eddy motions.  Furthermore, turbulent dissipation within the ACC may be a significant sink for the energy put into the ocean by winds acting on the Southern Ocean.

A group of physical oceanographers in the U.S. and U.K. have identified mixing processes in the Southern Ocean as a critical climate research question.  An experiment has been conceived to investigate Isopycnal and Diapycnal Mixing processes in the Southern Ocean (DIMES).  In order to focus the science questions and coordinate U.S. and U.K. field program ideas and proposal plans, a workshop at the Woods Hole Oceanographic Institution will be held on November 14-15 in Carriage House.  A detailed agenda will be forthcoming.  Students and other scientists in the WHOI community interested in mixing processes in the Southern Ocean are invited to attend the workshop.  As part of the workshop, the weekly Physical Oceanography seminar (Nov 15, 1500, 507 Clark Laboratory) will be given by Dr. Alberto C. Naveira Garabato, School of Ocean and Earth Science, National Oceaography Centre, Southampton, UK, entitled "Southern Ocean mixing:  A paradigm crossroads."

A Workshop on Diapycnal and Isopycnal Mixing Processes in the Southern Ocean

Monday, 14 November 2005


0815

Coffee and continental breakfast delivered

0830

Gather

0900

Welcome and Orientation

0915

Jim Ledwell, Review of US Tracer plan

0945

Andy Watson/Marie-Jose Messias, UK Tracer plans

1000

Break

1030

John Toole, Review of US microstructure and finestructure plans

1100

Alberto Naveira-Garabato/Mark Inall, UK Physics plans

1200

Lunch at the Buttery

1315

Coffee and cookies delivered at Carriage House

1330

Kevin Speer, Sarah Gille, and Breck Owens, Float plans

1445

James Girton, EM Float plan

1500

Tim Duda, Shearmeter plan

1515

Break

1530

Discussion, tie loose ends

1700

Break

1900

Dinner at Captain Kidd (suggested)



Tuesday, 15 November



0815

Coffee and continental breakfast delivered

0830

Gather

0900

Summary of Monday’s progress

0930

John Marshall + discussion

1015

Break

1030

Raff Ferrari + discussion

1115

Alberto Naveira-Garabato and Kurt Polzin on SOFINE process experiment

1200

Lunch at the Buttery

1315

Coffee delivered to Carriage House

1330

Sum up, formal meeting adjourned

1445

To P.O. Seminar by Alberto Naveira Garabato