Journal: Nature Communications

Article Title: Multiple episodes of ice loss from the Wilkes Subglacial Basin during the Last Interglacial

doi: 10.1038/s41467-023-37325-y

Figure Lengend Snippet: a Map of Antarctica showing subglacial bedrock elevation below sea level and locations of marine sediment cores and ice cores relevant to this study. Areas in white are above modern sea level and shaded areas are below modern sea level. EAIS, East Antarctic Ice Sheet. WAIS, West Antarctic Ice Sheet. b Detailed map of the Wilkes Subglacial Basin (WSB), with grey shading indicating bedrock elevation (as in panel a ) and coloured shading representing the simplified geographical extent of three geological terranes differentiated according to their neodymium isotope (ε Nd ) characteristics (map redrawn from ref. ). Also shown are the locations of relevant marine sediment cores (GC1407 and U1361A) and ice cores (Talos Dome; EDC, EPICA Dome C). Lines illustrate positions of the ice-sheet margin in different ice-sheet model simulations and scenarios: black dashed line, fully retreated state of Mengel and Levermann ; black solid line, simulated ice margin (8-km resolution and 300-year perturbation) in Sutter et al. ; light blue line, maximum simulated Last Interglacial (LIG) retreat in DeConto and Pollard . Sea-level contributions from the retreated states are given in the key. Grey arrow indicates modern flow direction of the bottom currents along the margin. Map created using the Quantarctica GIS package developed by the Norwegian Polar Institute and published under the Creative Commons Attribution 4.0 International License. Map redrawn from ref. with permission.

Article Snippet: Gravity core GC1407 was collected from the continental rise offshore of Wilkes Land (63.75°S, 130.52°E, 3687 m water depth) (Fig. ) during a survey of the Antarctic Geological and Geophysical Research Project (FY1993) by the Japan National Oil Corporation.

Techniques:

Journal: Nature Communications

Article Title: Multiple episodes of ice loss from the Wilkes Subglacial Basin during the Last Interglacial

doi: 10.1038/s41467-023-37325-y

Figure Lengend Snippet: a – e and f – j Multi-proxy data for the Holocene and Last Interglacial (LIG), respectively. a , f δ 18 O records from EPICA Dome C (EDC) ice core (thin and bold black lines are the raw signals and weighted smoothing, respectively) . b , g δ 18 O records from Talos Dome ice core (thin and bold orange lines are the raw signals and weighted smoothing, respectively) . c , h Authigenic 10 Be/ 9 Be ratios from core GC1407 (red squares, this study) (error bars are 1 s.d.). d , i Detrital sediment Nd isotopes (ε Nd ) from core GC1407 (dark blue diamonds, this study) and core U1361A (light blue diamonds) (error bars are 2 s.d.). e , j Iceberg rafted debris (IBRD, percent 250 µm–2 mm) from core GC1407 (dark green circles, this study) and core U1361A (light green circles) . Light blue and dark blue dashed lines in i indicate the core top ε Nd value of U1361A and GC1407, respectively. Yellow bars indicate two episodes of inferred Wilkes Subglacial Basin ice mass loss during the early and late LIG.

Article Snippet: Gravity core GC1407 was collected from the continental rise offshore of Wilkes Land (63.75°S, 130.52°E, 3687 m water depth) (Fig. ) during a survey of the Antarctic Geological and Geophysical Research Project (FY1993) by the Japan National Oil Corporation.

Techniques:

Journal: Nature Communications

Article Title: Multiple episodes of ice loss from the Wilkes Subglacial Basin during the Last Interglacial

doi: 10.1038/s41467-023-37325-y

Figure Lengend Snippet: a Antarctic ice-core temperature difference (ΔT, difference from mean values of the last millennium) derived from deuterium isotopes at EPICA Dome C (EDC) plotted on the AICC2012 age scale (grey line). b Southern Ocean bottom water temperature (BWT) from benthic foraminiferal Mg/Ca ratios at Ocean Drilling Program (ODP) Site 1123 (orange triangles) . c Southern Ocean sea surface temperature (SST) from diatom assemblages in core DCR-1PC (pink triangles) . d Authigenic 10 Be/ 9 Be ratios from core GC1407 (red squares, this study) (error bars are 1 s.d.). e Detrital sediment Nd isotopes (ε Nd ) from core GC1407 (dark blue diamonds, this study) (error bars are 2 s.d.). f Iceberg rafted debris (IBRD, percent 250 µm–2 mm) from core GC1407 (green circles, this study). Yellow bars indicate two episodes of inferred Wilkes Subglacial Basin ice mass loss during the early and late Last Interglacial.

Article Snippet: Gravity core GC1407 was collected from the continental rise offshore of Wilkes Land (63.75°S, 130.52°E, 3687 m water depth) (Fig. ) during a survey of the Antarctic Geological and Geophysical Research Project (FY1993) by the Japan National Oil Corporation.

Techniques: Derivative Assay