Retreat of the East Antarctic ice sheet during the last glacial termination

Mackintosh, Andrew; Golledge, Nicholas R.; Domack, Eugene W.; Dunbar, Robert B.; Leventer, Amy; White, Duanne; Pollard, David; DeConto, Robert M.; Fink, David; Zwartz, Dan; Gore, Damian B.; Lavoie, Caroline

doi:10.1038/ngeo1061

Cited by 189 publications

(179 citation statements)

References 45 publications

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“…It corresponds to the period when the Antarctic ice melting and retreat becomes more significant (Clark et al, 2009;Mackintosh et al, 2011). The climatic impact of additional fresh water in the Southern Ocean has been simulated , but the effect on the evolution of atmospheric CO 2 remains to be tested.…”

Section: Discussionmentioning

confidence: 99%

Systematic study of the impact of fresh water fluxes on the glacial carbon cycle

2012

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Abstract. During glacial periods, atmospheric CO 2 concentration increases and decreases by around 15 ppm. At the same time, the climate changes gradually in Antarctica. Such climate changes can be simulated in models when the AMOC (Atlantic Meridional Oceanic Circulation) is weakened by adding fresh water to the North Atlantic. The impact on the carbon cycle is less straightforward, and previous studies give opposite results. Because the models and the fresh water fluxes were different in these studies, it prevents any direct comparison and hinders finding whether the discrepancies arise from using different models or different fresh water fluxes.In this study we use the CLIMBER-2 coupled climate carbon model to explore the impact of different fresh water fluxes. In both preindustrial and glacial states, the addition of fresh water and the resulting slow-down of the AMOC lead to an uptake of carbon by the ocean and a release by the terrestrial biosphere. The duration, shape and amplitude of the fresh water flux all have an impact on the change of atmospheric CO 2 because they modulate the change of the AMOC. The maximum CO 2 change linearly depends on the time integral of the AMOC change. The different duration, amplitude, and shape of the fresh water flux cannot explain the opposite evolution of ocean and vegetation carbon inventory in different models. The different CO 2 evolution thus depends on the AMOC response to the addition of fresh water and the resulting climatic change, which are both model dependent. In CLIMBER-2, the rise of CO 2 recorded in ice cores during abrupt events can be simulated under glacial conditions, especially when the sinking of brines in the Southern Ocean is taken into account. The addition of fresh water in the Southern Hemisphere leads to a decline of CO 2 , contrary to the addition of fresh water in the Northern Hemisphere.

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Section: Discussionmentioning

confidence: 99%

Systematic study of the impact of fresh water fluxes on the glacial carbon cycle

2012

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“…Several recent studies have focussed on constraining the extent and thickness of extant ice sheets in Greenland (Roberts et al, 2008;Briner et al, 2014;Young et al, 2013) and Antarctica (Stone et al, 2003;Bentley et al, 2010;Mackintosh et al, 2011) since the LGM.…”

Section: Cosmogenic Datingmentioning

confidence: 99%

“…There is, therefore, a requirement for additional chronological constraints on palaeo-ice stream activity, including from marine IRD records (e.g. which has much potential to test numerical models and refine ice sheet reconstructions (Mackintosh et al, 2011;Jamieson et al, 2012).…”

Section: Capturing Ice Stream Dynamics In Numerical Ice Sheet Modelsmentioning

confidence: 99%

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Stokes

Tarasov

Blomdin

et al. 2015

Quaternary Science Reviews

151

104

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“…Robertson shelf, a relatively narrow part of the continental shelf. This has been heavily eroded and sculpted by grounded ice during glacial maxima, and deposition took place mainly during interglacials (Truswell et al 1999;Mackintosh et al 2011); it is very different from the deposition-dominated shelf in Prydz Bay (O'Brien et al 2007). Strong west-flowing currents transporting sediment and icebergs are dominant at present (Harris and O'Brien 1998;Truswell et al 1999).…”

Section: East Antarcticamentioning

confidence: 99%

Fossil proxies of near-shore sea surface temperatures and seasonality from the late Neogene Antarctic shelf

Clark

Williams

Hill

et al. 2013

Naturwissenschaften

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Retreat of the East Antarctic ice sheet during the last glacial termination

Cited by 189 publications

References 45 publications

Systematic study of the impact of fresh water fluxes on the glacial carbon cycle

Systematic study of the impact of fresh water fluxes on the glacial carbon cycle

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Fossil proxies of near-shore sea surface temperatures and seasonality from the late Neogene Antarctic shelf

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