Reconstructing the Antarctic Ice Sheet at the Last Glacial Maximum

Denton, George H.; Hughes, Terence J.

doi:10.1016/s0277-3791(01)00090-7

Cited by 201 publications

(131 citation statements)

References 35 publications

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“…The Lambert Glacier sector also thinned slightly compared to the late Holocene simulation, due to the spurious lack of ice retreat there in the Holocene simulation. The overall difference in ice elevations was in broad agreement with the reconstruction of Denton and Hughes (2002), with the exception of the Lambert Glacier region. The control LGM GIS (Fig.…”

Section: Last Glacial Maximumsupporting

confidence: 79%

A new coupled ice sheet/climate model: description and sensitivity to model physics under Eemian, Last Glacial Maximum, late Holocene and modern climate conditions

et al. 2011

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Abstract. The need to better understand long-term climate/ice sheet feedback loops is motivating efforts to couple ice sheet models into Earth System models which are capable of long-timescale simulations. In this paper we describe a coupled model that consists of the University of Victoria Earth System Climate Model (UVic ESCM) and the Pennsylvania State University Ice model (PSUI). The climate model generates a surface mass balance (SMB) field via a sub-gridded surface energy/moisture balance model that resolves narrow ice sheet ablation zones. The ice model returns revised elevation, surface albedo and ice area fields, plus coastal fluxes of heat and moisture. An arbitrary number of ice sheets can be simulated, each on their own highresolution grid and each capable of synchronous or asynchronous coupling with the overlying climate model. The model is designed to conserve global heat and moisture. In the process of improving model performance we developed a procedure to account for modelled surface air temperature (SAT) biases within the energy/moisture balance surface model and improved the UVic ESCM snow surface scheme through addition of variable albedos and refreezing over the ice sheet.A number of simulations for late Holocene, Last Glacial Maximum (LGM), and Eemian climate boundary conditions were carried out to explore the sensitivity of the coupled model and identify model configurations that best represented these climate states. The modelled SAT bias was Correspondence to: J. G. Fyke (fykejere@myvuw.ac.nz) found to play a significant role in long-term ice sheet evolution, as was the effect of refreezing meltwater and surface albedo. The bias-corrected model was able to reasonably capture important aspects of the Antarctic and Greenland ice sheets, including modern SMB and ice distribution. The simulated northern Greenland ice sheet was found to be prone to ice margin retreat at radiative forcings corresponding closely to those of the Eemian or the present-day.

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Section: Last Glacial Maximumsupporting

confidence: 79%

A new coupled ice sheet/climate model: description and sensitivity to model physics under Eemian, Last Glacial Maximum, late Holocene and modern climate conditions

et al. 2011

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“…S2). Reconstructions of grounded ice expansion within the Ross Embayment during the Last Glacial Maximum (LGM) 52 indicate an ice sheet that extended to near the edge of the continental shelf and was fed by a contribution from both East and West Antarctic 53 (Fig. S2).…”

Section: Geological Setting Of and 1b Drillcorementioning

confidence: 99%

Obliquity-paced Pliocene West Antarctic ice sheet oscillations

Naish

Powell

Levy

et al. 2009

Nature

655

589

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“…Most of its ice loss is pinned at the periphery of the continent, occurring through calving and basal melting of ice shelves. As a consequence, the area and volume of the Antarctic ice sheet is relatively stable 38 , affording little leverage for the albedo and elevation feedbacks to move atmospheric temperature. We suggest that the relative lack of ice-temperature feedbacks in Antarctica leaves atmospheric radiation balance, along with the possible effects of winter duration, as major determinants of the southern temperature response to orbitally driven changes in insolation.…”

Section: Implications For Northern and Southern Climatementioning

confidence: 99%