Totten Glacier subglacial hydrology determined from geophysics and modeling

dc.contributor.authorDow, Christine F.
dc.contributor.authorMcCormack, Felicity S.
dc.contributor.authorYoung, Duncan A.
dc.contributor.authorGreenbaum, Jamin S.
dc.contributor.authorRoberts, Jason L.
dc.contributor.authorBlankenship, Donald D.
dc.date.accessioned2024-10-30T17:15:47Z
dc.date.available2024-10-30T17:15:47Z
dc.date.issued2020-02-01
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.epsl.2019.115961. © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.description.abstractAurora Subglacial Basin (ASB), which feeds Totten Glacier, is a marine basin lying below sea level and contains up to 3.5 m of global sea level equivalent. Rates of future sea level rise from this area are primarily dependent on the stability of Totten Ice Shelf and the controls on ice flow dynamics upstream of the grounding line, both of which may be influenced by subglacial hydrology. We apply the GlaDS subglacial hydrology model to ASB to examine whether the spatial patterns of distributed and efficient drainage systems impact the dynamics of Totten Glacier. We determine the most appropriate model configuration from our series of sensitivity tests by comparing the modeled basal water pressure and water depth results with specularity content data. Those data are derived from ICECAP radar surveys over the same region and represent regions of basal water accumulation. The best match between simulated basal hydrology properties and specularity content shows a strong correspondence in regions of distributed water in the ASB troughs for both water depth and water pressure, but weak correspondence between water depth and specularity content near the grounding line. This may be due to the presence of several large channels draining over the grounding line into the head of Totten Ice Shelf, which are likely not as well represented in the specularity content data as distributed systems. These channels may have a significant impact on melt, and therefore the stability, of Totten Ice Shelf. Within ASB, regions of high water pressure and greater water accumulation correspond well with regions of faster ice flow, suggesting some control of basal hydrology on ice dynamics in this region.
dc.identifier.urihttps://doi.org/10.1016/j.epsl.2019.115961
dc.identifier.urihttps://hdl.handle.net/10012/21171
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofseriesEarth and Planetary Science Letter; 531; 115961
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleTotten Glacier subglacial hydrology determined from geophysics and modeling
dc.typeArticle
dcterms.bibliographicCitationDow, C. F., McCormack, F. S., Young, D. A., Greenbaum, J. S., Roberts, J. L., & Blankenship, D. D. (2020). Totten Glacier Subglacial Hydrology determined from Geophysics and Modeling. Earth and Planetary Science Letters, 531, 115961. https://doi.org/10.1016/j.epsl.2019.115961
uws.contributor.affiliation1Faculty of Environment
uws.contributor.affiliation2Geography and Environmental Management
uws.peerReviewStatusReviewed
uws.scholarLevelFaculty
uws.typeOfResourceTexten

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