[Eoas-seminar] Please join us for the PO faculty candidate Dr. Xiaoting Yang's seminar on Tuesday afternoon at 3pm in room 1044

[eoas-seminar at lists.fsu.edu]

Please join us for the PO faculty candidate seminar on Tuesday afternoon at 3pm in room 1044

Dr. Xiaoting Yang
Scripps Institution of Oceanography

Tuesday, April 2
3:00 pm
Room 1044


“Three-dimensional structure of mid-depth Meridional Overturning Circulation: a study on the dynamics and paths of the Ocean Deep Eastern Boundary Currents.”

Abstract:
The Meridional Overturning Circulation carries significant transports of mass, carbon, heat and other important tracers in the global ocean, and it has a rich three-dimensional structure. Southward Deep Eastern Boundary Currents (DEBCs), between one and four km depth in the Southern Hemisphere basins, are important branches of the overturning circulation by contributing to large-scale ocean transport and determining mid-depth tracer distribution patterns. However, these currents have remained under-appreciated for their roles in global circulation and their dynamics were not well understood. The vorticity dynamics of such currents are studied in a hierarchy of models in this work. Realistic and idealized regional GCM experiments robustly show that these DEBCs are governed by a layered-structure of vorticity dynamics: a wide layer dominated by “interior-like” vorticity balance, plus a narrow hydrostatic layer adjacent to the eastern boundary. This means that DEBCs are dynamically different from the well-known western boundary currents. It is further shown that the dominant vortex stretching term is maintained by both eddy temperature transport and sloping bathymetry, indicating that topography plays a role in determining the mid-depth large-scale mass transport pathways. How the DEBCs contribute to meridional large-scale ocean transport is studied from a Lagrangian perspective. DEBCs, along with the deep western boundary currents, and mid-depth interior flows, are found to be important branches carrying mid-depth mass southward towards Drake Passage.

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Eric Chassignet
Professor and Director
Center for Ocean-Atmospheric Prediction Studies (COAPS)
Florida State University
2000 Levy Avenue, Building A, Suite 292
P.O. Box 3062741
Tallahassee, FL  32306-2741

Office : (1) 850-645-7288
COAPS  : (1) 850-644-3846
Cell   : (1) 850-524-0033 (urgent matters only)
FAX    : (1) 850-644-4841
E-mail : echassignet at fsu.edu
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