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Please join us for the PO faculty candidate seminar on Tuesday afternoon at 3pm in room
<b>1044</b></div>
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<b>Dr. Xiaoting Yang</b></div>
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Scripps Institution of Oceanography</div>
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<b>Tuesday, April 2</b></div>
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<b>3:00 pm</b></div>
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<b>Room 1044</b></div>
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<b><i>“Three-dimensional structure of mid-depth Meridional Overturning Circulation: a study on the dynamics and paths of the Ocean Deep Eastern Boundary Currents.”</i></b></div>
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<b><i> </i></b></div>
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Abstract:</div>
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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. </div>
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<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Eric Chassignet</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Professor and Director</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Center for Ocean-Atmospheric Prediction Studies (COAPS)</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Florida State University</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">2000 Levy Avenue, Building A, Suite 292</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">P.O. Box 3062741</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Tallahassee, FL 32306-2741</div>
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<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Office : (1) 850-645-7288</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">COAPS : (1) 850-644-3846</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">Cell : (1) 850-524-0033 (urgent matters only)</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">FAX : (1) 850-644-4841</div>
<div style="font-family: Tahoma; font-size: 13px; color: rgb(153, 153, 153);">E-mail : echassignet@fsu.edu</div>
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