04/29/2015 - 3:30pm
8610 Kennel Way La Jolla, CA 92037, US
"The cross frontal exchange near the Drake Passage”. Abstract: The Antarctic Circumpolar Current (ACC) in the Southern Ocean is associated with steep isopycnals and large potential vorticity gradient, which act as barriers to meridional tracer transport. In order to understand the tracer and energy balance of the Southern Ocean, it is crucial to understand where and how the cross frontal transport occurs. The Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) project was designed to answer such questions by conducting anthropogenic tracer and subsurface float experiments together with in-situ CTD and microstructure measurements near the Drake Passage. In this talk, I will present the DIMES tracer measurements and discuss the cross frontal transport near the Drake Passage using both DIMES tracer and the supporting results from a suite of particle simulations in the Southern Ocean State Estimate (SOSE). The Drake Passage is shown to be associated with enhanced cross frontal exchange.
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