NWFSC Monster Seminar Jam: Jake Steinberg
This seminar is part of the Northwest Fisheries Science Center's Monster Seminar Jam series.
Jake Steinberg (Woods Hole Oceanographic Institute) is presenting a talk, "Using Deepglider AUV's to explore the structure of large ocean eddies and the role they play in the redistribution of energy and tracers."
Hundreds of full-depth temperature and salinity profiles collected by Deepglider AUVs in the North Atlantic reveal eddy isopycnal vertical displacements and geostrophic velocities to regularly extend to the seafloor. In two separate missions southeast of Bermuda, subsurface intensified cold, fresh coherent vortices were observed with velocities exceeding 20 cm/s at depths greater than 1000m. Full-depth slant profiles, revealing the evolution of eddy vertical structures over many months, are investigated using normal modes. Mesoscale turbulence theory predictions regarding the partitioning of kinetic and potential energy among modes agree with these new observations. Along-isopycnal temperature anomalies are separately investigated and similarly reveal full depth eddy structure, with enhanced variance between 1000 m and 2000 m. Differing patterns of variance across glider mission sites suggest different stirring mechanisms relating to sloping bathymetry and proximity to the Gulf Stream. Among glider mission sites, geographic and seasonal variability implicate bottom drag as a mechanism for dissipation, but also the need for more persistent sampling of the deep ocean.
Dr. Steinberg is a postdoctoral scholar at the Woods Hole Oceanographic Institute and has a PhD in Oceanography from the University of Washington. His research focuses on observing mesoscale turbulence, eddy structure, behavior, and energetics. He will be sharing his research using Deepglider AUV's to explore the structure of large ocean eddies and the role they play in the redistribution of energy and tracers.
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