Notes

Slide Show

Outline

1	Vertical Fine Structure Beneath the Ice of the Western Antarctic Peninsula Shelf in Austral Winter 2001 – NBP0104 Jason Hyatt, WHOI-MIT Robert C. Beardsley John M. Klinck Eileen E. Hofmann
2	Vertical Structure – Vertical Fluxes Scale Separation from horizontal processes. Flux estimates have been made based on budgets. Analysis of the vertical structure may help us understand and better quantify the mechanisms of vertical heat and material fluxes. Heat melts ice. Krill like heat!
3	The winter cruise platform was more stable than fall due to ice cover
4	The Surface Mixed Layer
5	Surface mixed layer depth
6	An example of a layered vertical structure in main pycnocline
7	Double Diffusive Convection Stable Salt Stratification, unstable thermal. Heat diffuses 100x faster than salt Density is dominated by salt gradient
8	Possible mechanisms for pycnocline layers Diffusive regime of DDC. Observed in the Weddell Sea (Muench et al, 1990). Easily disrupted by… Internal wave breaking turbulence. Probably a factor in areas with topography or boundaries. Iceberg induced turbulence?
9	Where the steps occurred
10	Strong layering within pycnocline present at a few stations
11	Often Interesting Structure around T_max
12	A Possible Scenario…
13	Summary of Vertical Structure for Winter 2001 Surface Mixed Layer deepens at the shelf break and in Marguerite Bay, and shallows over the center of the study area. A few stations show strong layering. Steps in main pycnocline of “Type A” present near boundaries and topography. Sometimes structure near T_max. Shear?
14	Future Work… Look further into possible mechanisms, and estimate fluxes associated – reasonable values? Raw scan data. Fall data. Biomapper data. Internal wave energy spectra from moorings. Interleaving, anyone? Do Krill like turbulence?
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