Table 1 Isotopic anomalies and elevation changes calculated and modelled for Talos Dome during interglacial MIS 5.5, 7.5, and 9.3

From: Wilkes subglacial basin ice sheet response to Southern Ocean warming during late Pleistocene interglacials

 

MIS 5.5

MIS 7.5

MIS 9.3

Time interval of δ18O anomaly (ka) at TALDICE

117–127

237–240

326–331

δ18O max and δ18O min (‰)

(−35.45)–(−37.13)

(−37.19)–(−37.87)

(−35.46)–(−36.89)

Δδ18O (‰)

+1.68

+0.68

+1.42

Lapse rate (‰/100m)

Elevation changes (m)

−0.53 (Sutter et al. 2020)

−317

−128

−268

−0.93 (Goursaud et al. 2020)

−180

−73

−153

−1.35 (Magand et al. 2004)

−124

−50

−105

  

MIS 5.5

MIS 7.5

MIS 9.3

 

Ocean forcing

GRISLI elevation changes at Talos Dome (m)

Time interval for max elevation anomaly at TALDICE (ka)

115–128

233–241

321–332

DS

Quiquet et al. (2018)

−123

−103

−757

DS-5

Quiquet et al. (2018) +5%

−114

−104

−754

DS-10

Quiquet et al. (2018) +10%

−146

−105

−749

GS

Quiquet et al. (2018)

−126

−85

−134

GS-5

Quiquet et al. (2018) +5%

−116

−89

−473

GS-10

Quiquet et al. (2018) +10%

−152

−103

−754

  1. Isotopic anomalies are calculated from the δ18O record resampled at 200 year intervals. Elevation changes are calculated from the isotopic anomalies using the lapse rate estimates of Sutter et al.9, Goursaud et al.29, and Magand et al.49. Deglaciated Start (DS) and Glacial Start (GS) elevation changes are modelled for 6 sensitivity tests performed with the Grenoble Ice Sheet and Land Ice (GRISLI) ice sheet model, varying the Antarctic ice sheet initial conditions and the Southern Ocean (SO) temperature forcing. DS simulations are initialized with Antarctic interglacial initial conditions at 400 ka and GS simulations are initialized with Antarctic glacial initial conditions at 400 ka. Elevation variations at Talos Dome are calculated for the interglacial time intervals when the simulated GRISLI ice thickness variations are maximized.
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