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Effect of localized high basal melting on transient subglacial water flow evolution beneath Campbell Glacier, Antarctica

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dc.contributor.authorLee, Seung Hyoun-
dc.contributor.authorLee, Choon-Ki-
dc.contributor.authorLee, Won Sang-
dc.contributor.authorDow, Christine-
dc.contributor.authorPark, In-Woo-
dc.date.accessioned2021-09-30T22:51:01Z-
dc.date.available2021-09-30T22:51:01Z-
dc.date.issued2019-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/12901-
dc.description.abstractObserving the flow of subglacial water evolution beneath the polar ice sheet has long been a challenging issue. The spatiotemporal subglacial water evolution can be indirectly estimated by ice-radar, GPS, and satellite altimetry technique. At present, one of the main causes of the accelerated migration of the Antarctic ice sheet is ice-bed boundary conditions in terms of subglacial hydrology. However, its reliability is low due to the limited observation and verification data. Based on the GPS time series along the Campbell Glacier, we observed that the ice sheet surface height (h) and ice sheet velocity (v) represent a specific periodicity. In terms of the subglacial hydrologic flow, these changes are caused by the sequential steps as follows: accumulation of melted water around subglacial lake ??increasing the water pressure ??increasing the ice sheet velocity due to the lower friction ??channel(efficient) flow activation ??rapid depletion of water storage ??the decrease of altitude and the reduction of ice sheet velocity. In this study, the GlaDS (Glacier Drainage System) model, which can realize interactions between sheet flow type and channel flow type, was used to realize the temporal and spatial hydrological variability beneath the Campbell glacier. The basal topography was constructed by recent ice radar (KOPRI/UTIG flight line) data with mass conservation(MC). Based on the assumption of high basal melting around active volcano Mt. Melbourne, with various channel and sheet hydraulic conductivity conditions, spatiotemporal subglacial flow evolution was analyzed. The localized high basal melting around Mt. Melbourne activates the high concentration of channelized flow, which modulate the effective pressure and subglacial discharge. The results showed that boundary conditions(e.g.. basal topography, basal melting distribution) beneath ice sheet should be better constrained to represent the flow close to reality.en_US
dc.languageEnglishen_US
dc.language.isoenen_US
dc.titleEffect of localized high basal melting on transient subglacial water flow evolution beneath Campbell Glacier, Antarcticaen_US
dc.title.alternative국지적 빙저용융량의 증가가 캠벨빙하 하부 수문망 진화에 미치는 영향 연구en_US
dc.typeProceedingen_US
dc.identifier.bibliographicCitationLee, Seung Hyoun, et al. 2019. Effect of localized high basal melting on transient subglacial water flow evolution beneath Campbell Glacier, Antarctica. Forum for Research into Ice Shelf Processes (FRISP). The Queen’s College, Oxford, UK. 2019.09.15~2019.09.18.-
dc.citation.conferenceDate2019.09.15~2019.09.18en_US
dc.citation.conferenceNameForum for Research into Ice Shelf Processes (FRISP)en_US
dc.citation.conferencePlaceThe Queen’s College, Oxford, UKen_US
dc.description.articleClassificationPro(초록)국외-
dc.identifier.localId2019-0472-
Appears in Collections  
2019-2019, Modelling subglacial water flow evolution based on Antarctic observation data (19-19) / Lee, Seung Hyoun (PE19400)
2019-2020, Land-Ice/Ocean Network Exploration with Semiautonomous Systems: Thwaites Glacier (LIONESS/TG) - Toward understanding the fate of the Thwaites Glacier by abrupt collapse and its impact on global sea level changes - (19-20) / Lee, Won Sang (PM19020)
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