Evidence of past migration of the ice divide between the Shirase and Sôya drainage basins derived from chemical characteristics of the marginal ice in the Sôya drainage basin, East Antarctica

Iizuka, Yoshinori; Matsui, Hideki; Iwasaki, Shun; Maemoku, Hideaki; Sawagaki, Takanobu; Greve, Ralf; Satake, Hiroshi; Sasa, Kimikazu; Matsushi, Yuki

doi:10.3189/002214310792447707

Cited by 4 publications

(3 citation statements)

References 25 publications

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“…We define a quadratic domain of the size 203.092 × 203.092 km around Dome Fuji (Fig. 1), which corresponds to a 200 × 200 km domain in the stereographic plane with standard parallel at 71 • S used by the Antarctica version of the large-scale ice sheet model SICOPOLIS (Iizuka et al, 2010). Within 30 km from Dome Fuji, the surface and bedrock topographies are given by the high-resolution data mentioned in the introduction.…”

Section: Coordinate System and Domainmentioning

confidence: 99%

A full Stokes ice flow model for the vicinity of Dome Fuji, Antarctica, with induced anisotropy and fabric evolution

et al. 2011

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Abstract.A three-dimensional, thermo-mechanically coupled ice flow model with induced anisotropy has been applied to a ∼200 × 200 km domain around the Dome Fuji drill site, Antarctica. The model ("Elmer/Ice") is based on the open-source multi-physics package Elmer (http://www. csc.fi/elmer/) and solves the full Stokes equations. Flowinduced anisotropy in ice is accounted for by an implementation of the Continuum-mechanical, Anisotropic Flow model, based on an anisotropic Flow Enhancement factor ("CAFFE model"). Steady-state simulations for present-day climate conditions are conducted. The main findings are: (i) the flow regime at Dome Fuji is a complex superposition of vertical compression, horizontal extension and bed-parallel shear; (ii) for an assumed geothermal heat flux of 60 mW m −2 the basal temperature at Dome Fuji reaches the pressure melting point and the basal melting rate is ∼0.35 mm a −1 ; (iii) in agreement with observational data, the fabric shows a strong single maximum at Dome Fuji, and the age of the ice is decreased compared to an isotropic scenario; (iv) as a consequence of spatially variable basal melting conditions, the basal age tends to be smaller where the ice is thicker and larger where the ice is thinner. The latter result is of great relevance for the consideration of a future drill site in the area.

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Section: Coordinate System and Domainmentioning

confidence: 99%

A full Stokes ice flow model for the vicinity of Dome Fuji, Antarctica, with induced anisotropy and fabric evolution

et al. 2011

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“…Furthermore, Iizuka et al . (2010) reported a shift of c. 50 km for the ice divide between the Sôya and the Shirase drainage basins in East Antarctica between the Last Glacial Maximum and the earliest Holocene.…”

Section: Clay Mineral Assemblages In Sediments Deposited During the Lmentioning

confidence: 99%

Provenance changes between recent and glacial-time sediments in the Amundsen Sea embayment, West Antarctica: clay mineral assemblage evidence

et al. 2011

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Abstract:The Amundsen Sea embayment is a probable site for the initiation of a future collapse of the West Antarctic Ice Sheet. This paper contributes to a better understanding of the transport pathways of subglacial sediments into this embayment at present and during the last glacial period. It discusses the clay mineral composition of sediment samples taken from the seafloor surface and marine cores in order to decipher spatial and temporal changes in the sediment provenance. The most striking feature in the presentday clay mineral distribution is the high concentration of kaolinite, which is mainly supplied by the Thwaites Glacier system and indicates the presence of hitherto unknown kaolinite-bearing sedimentary strata in the hinterland, probably in the Byrd Subglacial Basin. The main illite input is via the Pine Island Glacier. Smectite originates from the erosion of volcanic rocks in Ellsworth Land and western Marie Byrd Land. The clay mineral assemblages in diamictons deposited during the last glacial period are distinctly different from those in corresponding surface sediments. This relationship indicates that glacial sediment sources were different from modern ones, which could reflect changes in the catchment areas of the glaciers and ice streams.

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“…Analogous historical changes in flow direction and ice divide migration have been inferred from chemical tracers (Iizuka et al, 2010) and are widely documented in paleo ice sheet reconstructions (Conway and Rasmussen, 2009;Iizuka et al, 2010), whilst ongoing ice divide migration has been inferred from isochrones (Nereson et al, 1998) and thickness change measurements (Conway and Rasmussen, 2009). To our knowledge, however, redirection of ice flow from one ice stream to another has not been observed directly on ~15-year timescales, it may have occurred at glacier and ice cap scale.…”

Section: Redirection Of Ice Flowmentioning

confidence: 71%

Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith and Kohler region of West Antarctica

Selley,

Hogg,

Davison

et al. 2024

Preprint

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Abstract. The ice streams feeding Dotson and Crosson Ice Shelves are some of the fastest changing in West Antarctica. We use satellite observations to measure the change in ice speed and flow direction on eight ice streams in the Pope, Smith and Kohler region of West Antarctica from 2005 to 2022. Seven ice streams have sped up at the grounding line, with the largest increase in ice speed at Smith West Glacier (87 %) whilst Kohler West Glacier has slowed by 10 %. We observe progressive redirection of ice flowlines from Kohler West into the more rapidly thinning and accelerating Kohler East Glacier, resulting in the deceleration of Kohler West Glacier and eastward migration of the ice divide between Dotson and Crosson Ice Shelves. These observations reveal previously undocumented impacts of spatially varying ice speed and thickness changes on flow direction and ice flux into downstream ice shelves, which may influence ice shelf and sheet mass change during the 21st century.

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Evidence of past migration of the ice divide between the Shirase and Sôya drainage basins derived from chemical characteristics of the marginal ice in the Sôya drainage basin, East Antarctica

Abstract: ABSTRACT. Ice originating near the inland ice divide of the ice sheet can reappear as marginal ice at the surface near the ice terminal in the ablation area. We have analyzed d

Cited by 4 publications

References 25 publications

A full Stokes ice flow model for the vicinity of Dome Fuji, Antarctica, with induced anisotropy and fabric evolution

A full Stokes ice flow model for the vicinity of Dome Fuji, Antarctica, with induced anisotropy and fabric evolution

Provenance changes between recent and glacial-time sediments in the Amundsen Sea embayment, West Antarctica: clay mineral assemblage evidence

Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith and Kohler region of West Antarctica

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