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dc.contributor.authorLu, Kofan
dc.date.accessioned2019-10-16T18:36:10Z
dc.date.available2019-10-16T18:36:10Z
dc.date.issued2019-08
dc.identifier.urihttp://hdl.handle.net/11122/10628
dc.descriptionDissertation (Ph.D.) University of Alaska Fairbanks, 2019en_US
dc.description.abstractWarm, moderately salty Bering Sea Water (BSW) carried into the Chukchi Sea through Bering Strait provides an oceanic heat flux for melting sea ice comparable to that of the solar heat flux. Intrusions of BSW transport heat and nutrients via intrapycnocline eddies vertically beneath the sea ice and laterally across structural fronts near the ice edge, setting up hydrographic features important to ice edge communities and the seasonal evolution of the ice melt-back. However, the intrapycnocline eddy dynamics and associated hydrography near the fronts have not previously been well described or characterized. Three numerical models using the Regional Ocean Model System (ROMS) are integrated to systematically investigate the importance of the intrapycnocline eddy field and the factors that affect its dynamics. The models suggest that the heat transported by eddies depends on frontal stratification, which is influenced primarily by the Bering Strait inflow discharge and salinity. The eddy field is also indirectly modified by the sea surface height, which varies with strong winds. Two frontal zones near the ice edge are identified according to the model-derived hydrographic structures and eddy dynamics: the Shelf Water Transition Zone (SWTZ) and the Melt Water Transition Zone (MWTZ). Improved understanding of these frontal zones will benefit future research of the ice edge ecosystem. Our models show a noticeable effect of strong wind events on ice edge displacement and vertical transports, both of which may be important to primary production in the frontal zones. Changing winds associated with increasing sea surface temperatures could alter the manifestation of the processes highlighted in this study.en_US
dc.description.sponsorshipBOEM, US Dept. of Interior, and ConocoPhillips Alaska Company, Shell Exploration and Production Company, and Statoil USA E+P, Incen_US
dc.description.tableofcontentsIntroduction -- Chapter 1. Lateral mixing across ice meltwater fronts of the Chukchi Sea shelf -- Chapter 2. Assessing the role of oceanic heat fluxes on ice ablation of the central Chukchi Sea shelf -- Chapter 3. Impacts of Short-Term Wind Events on Chukchi Hydrography and Sea Ice Retreat -- Conclusions -- Future perspectives.en_US
dc.language.isoen_USen_US
dc.subjectsea iceen_US
dc.subjectChukchi Seaen_US
dc.subjecthydrologyen_US
dc.titleNumerical investigations of the hydrography, dynamics, and ice distributions of Chukchi Sea shelfen_US
dc.typeDissertationen_US
dc.type.degreephden_US
dc.identifier.departmentDepartment of Oceanographyen_US
dc.contributor.chairDanielson, Seth
dc.contributor.chairWeingartner, Thomas
dc.contributor.committeeHedstrom, Kate
dc.contributor.committeeShimada, Koji
dc.contributor.committeeWinsor, Peter
refterms.dateFOA2020-03-07T01:15:15Z


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