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    Wind, sea ice, inertial oscillations and upper ocean mixing in Marguerite Bay, Western Antarctic Peninsula : observations and modeling

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    Hyatt_thesis_final_accept.pdf (3.958Mb)
    Date
    2006-09
    Author
    Hyatt, Jason  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1238
    Location
    Marguerite Bay
    Western Antarctic Peninsula
    DOI
    10.1575/1912/1238
    Keyword
     Sea ice; Ocean-atmosphere interaction; Nathaniel B. Palmer (Ship) Cruise NBP01-03; Laurence M. Gould (Ship) Cruise LMG01-06 
    Abstract
    Two years of moored oceanographic and automatic weather station data which span the winter ice seasons of 2001-2003 within Marguerite Bay on the western Antarctic Peninsula (wAP) shelf were collected as part of the Southern Ocean Global Ocean Ecosystems Dynamics program. In order to characterize the ice environment in the region, a novel methodology is developed for determining ice coverage, draft and velocity from moored upward-looking acoustic Doppler current profiler data. A linear momentum balance shows the importance of internal ice stresses in the observed motion of the ice pack. Strong inertial, not tidal, motions were observed in both the sea ice and upper ocean. Estimates of upward diapycnal fluxes of heat and salt from the Upper Circumpolar Deep Water to the surface mixed layer indicate almost no contribution from double diffusive convection. A one-dimensional vertical mixed layer model adapted for investigation of mixing beneath an ice-covered ocean indicates that the initial wind event, rather than subsequent inertial shear, causes the majority of the mixing. This work points towards episodic wind-forced shear at the base of the mixed layer coupled with static instability from brine rejection due to ice production as a major factor in mixing on the wAP shelf.
    Description
    Submitted in partial fulfillment of the requirements of the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 2006
    Collections
    • Physical Oceanography (PO)
    • WHOI Theses
    Suggested Citation
    Thesis: Hyatt, Jason, "Wind, sea ice, inertial oscillations and upper ocean mixing in Marguerite Bay, Western Antarctic Peninsula : observations and modeling", 2006-09, DOI:10.1575/1912/1238, https://hdl.handle.net/1912/1238
     

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