dc.contributor.advisor |
Bowen, M |
en |
dc.contributor.advisor |
Behrens, E |
en |
dc.contributor.advisor |
Sutton, P |
en |
dc.contributor.author |
Madawi, Abdullah |
en |
dc.date.accessioned |
2019-12-01T20:22:35Z |
en |
dc.date.issued |
2019 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/49266 |
en |
dc.description |
Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
Antarctic Bottom Water (AABW) refers to a collection of very dense bottom water masses formed around Antarctica that make up 36% of the global ocean volume and 58% of the global ocean floor. AABW is the dominant bottom water mass in the Pacific, Indian and South Atlantic Oceans. The different types of water masses making up AABW have slightly different temperatures, salinities and formation rates, which affects the homogenization of AABW in the Southern Ocean. High salinity AABW from the Ross Sea is driven by highly energetic gravity currents produced by the export of High Salinity Shelf Water (HSSW) and accounts for about 25% of total AABW. Changes in water properties in the Ross Sea are advected to the global ocean along different pathways with varying advection timescales. The effect of mesoscale eddies on the temporal and spatial variability of the export pathways of AABW from the Ross Sea were investigated using a nested model configuration. The underlying model grid in the eddy-permitting model was a global non eddy-resolving grid (1). A model nest was implemented over the South Pacific in the eddy-permitting model, resulting in an effective resolution of 1/5, which enabled processes in the Ross and Amundsen Sea to the spatial resolution of mesoscale eddies. The global simulations covered the period from January 1958 to January 2018. The pathways from the Ross Sea were analysed using Eulerian and Lagrangian diagnostics. Enhanced mixing and mesoscale eddies resulted in increased local and Antarctic circulation, coinciding with longer pathways but quicker travel times. Increased circulation affected the connectivity in the Southern Ocean by increasing the amount of AABW reaching the Weddell and Amundsen Seas and the transport of AABW northward into the Pacific, Atlantic and Indian Oceans. The Southwest Pacific (SWP) deep western boundary current (DWBC) east of New Zealand was found to be the most prominent pathway for the advection of changes in Antarctic Bottom Water (AABW) source regions to the deep basins in the North Pacific, with advection times lesser than 50 years, much shorter than previously estimated residence times of AABW. The higher resolution simulation resolved pathways to the deep North Pacific that did not exist in the coarse simulation, in particular particles circling Antarctica en route to the deep North Pacific. |
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dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
Masters Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA99265208214102091 |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights |
Restricted Item. Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
en |
dc.title |
Pathways of Antarctic Bottom Water from the Ross Sea |
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dc.type |
Thesis |
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thesis.degree.discipline |
Coastal and Marine Science |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Masters |
en |
dc.rights.holder |
Copyright: The author |
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pubs.elements-id |
788136 |
en |
pubs.org-id |
Science |
en |
pubs.org-id |
School of Environment |
en |
pubs.record-created-at-source-date |
2019-12-02 |
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dc.identifier.wikidata |
Q112949376 |
|