Tropical tales of polar ice: evidence of Last Interglacial polar ice sheet retreat recorded by fossil reefs of the granitic Seychelles islands

Dutton, Andrea; Webster, Jody M.; Zwartz, Dan; Lambeck, Kurt; Wohlfarth, Barbara

doi:10.1016/j.quascirev.2014.10.025

Cited by 105 publications

(128 citation statements)

References 67 publications

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“…Standalone ice-sheet model simulations forced by ocean warming suggest the West Antarctic ice sheet to be a major contributor to LIG global mean sea-level rise, with contributions also coming from the marine-based portions of the East Antarctic ice sheet (DeConto and Pollard, 2016). Contributions are 6.0-7.5 m of the equivalent sea-level rise, which would explain the global mean sea level being at least +6 m by ∼ 127 ka (Dutton et al, 2015b). However, because of the difficulty in implementing ice-to-ocean changes for the WAIS and the uncertainties associated with dating the changes in the other ice sheets, the paleogeography of the lig127k simulation will be prescribed the same as in the DECK piControl simulation (Table 1).…”

Section: Paleogeography and Ice Sheetsmentioning

confidence: 97%

“…The cessation of deposition of ice-rafted debris (IRD) from the Eurasian ice sheet has been dated to between 128 and 126 ka using δ 18 O (Risebrobakken et al, 2006). However, sea-level data (Dutton et al, 2015b) suggest that this ice sheet disappeared earlier and was likely gone by ∼ 127 ka. Proximal marine records of the Greenland ice sheet document a gradual retreat during the LIG, with minimum extent around 120 ka (Carlson et al, 2008a;Colville et al, 2011;Stoner et al, 1995;Winsor et al, 2012).…”

Section: Paleogeography and Ice Sheetsmentioning

confidence: 99%

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The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

et al. 2017

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Abstract. Two interglacial epochs are included in the suite of Paleoclimate Modeling Intercomparison Project (PMIP4) simulations in the Coupled Model Intercomparison Project (CMIP6). The experimental protocols for simulations of the mid-Holocene (midHolocene, 6000 years before present) and the Last Interglacial (lig127k, 127 000 years before present) are described here. These equilibrium simulations are designed to examine the impact of changes in orbital forcing at times when atmospheric greenhouse gas levels were similar to those of the preindustrial period and the continental configurations were almost identical to modern ones. These simulations test our understanding of the interplay between radiative forcing and atmospheric circulation, and the connections among large-scale and regional climate changes giving rise to phenomena such as land-sea contrast and highlatitude amplification in temperature changes, and responses of the monsoons, as compared to today. They also provide an opportunity, through carefully designed additional sensitivity experiments, to quantify the strength of atmosphere, ocean, cryosphere, and land-surface feedbacks. Sensitivity experiments are proposed to investigate the role of freshwater forcing in triggering abrupt climate changes within interglacial epochs. These feedback experiments naturally lead to a focus on climate evolution during interglacial periods, which will be examined through transient experiments. Analyses of the sensitivity simulations will also focus on interactions between extratropical and tropical circulation, and the relationship between changes in mean climate state and climate variability on annual to multi-decadal timescales. The comparative abundance of paleoenvironmental data and of quantitative climate reconstructions for the Holocene and Last Interglacial make these two epochs ideal candidates for systematic evaluation of model performance, and such comparisons will shed new light on the importance of external feedbacks (e.g., vegetation, dust) and the ability of state-of-the-art models to simulate climate changes realistically.

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Section: Paleogeography and Ice Sheetsmentioning

confidence: 97%

Section: Paleogeography and Ice Sheetsmentioning

confidence: 99%

The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

et al. 2017

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“…In general, the Laurentide LGM ice limits are the most extensive (e.g., Dyke et al, 2002), except for some protrusions of older glacial material, e.g., in Illinois (type section for the pre-LGM Illinoian glaciation that includes the PGM, Curry et al, 2011), where several glacial till members and glacial ridges extend beyond the Wisconsinan (LGM) limits, with OSL constraints that suggest three advances within MIS 6 (McKay and . More extensive pre-LGM (including Illinoian) ice limits have also been reported in Ohio (e.g., Pavey et al, 1999;Szabo et al, 2011;, Pennsylvania (Braun, 2011 and references therein), Missouri (e.g., Rovey and Balco, 2011), and Wisconsin (Syverson and Colgan, 2011), but age control and correlations are problematic.…”

Section: Synthesis Of Pgm Ice-sheet Extents Mapping and Datingmentioning

confidence: 99%

“…Such contrasting ice-mass distributions between successive glacial maxima highlight significant complexity in the processes that drive glaciation into different 'modes' (e.g., Liakka et al, 2016). The difference also has repercussions for glacioisostatic adjustment (GIA) studies of sea-level history during the LIG, which was about 1 C warmer than the Holocene (Clark and Huybers, 2009;Turney and Jones, 2010;McKay et al, 2011;Hoffman et al, 2017;Hansen et al, 2017), with sea levels that reached 4e10 m higher than today Dutton and Lambeck, 2012;Grant et al, 2012;Stocker et al, 2013;Dutton et al, 2015aDutton et al, , 2015b. Dendy et al (2017) investigated the sensitivity of the predictions of the last interglacial highstand to uncertainties in the configuration of the major northern hemisphere ice sheets during MIS 6.…”

Section: Introductionmentioning

confidence: 99%

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Rohling

Hibbert

Williams

et al. 2017

Quaternary Science Reviews

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115

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Arctic ice shelf Last Interglacial Glacioisostatic adjustment a b s t r a c t Studies of past glacial cycles yield critical information about climate and sea-level (ice-volume) variability, including the sensitivity of climate to radiative change, and impacts of crustal rebound on sealevel reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms of global volume and distribution of land ice, despite similar temperatures and radiative forcing. Our analysis challenges conventional views of relationships between global ice volume, sea level, seawater oxygen isotope values, and deep-sea temperature, and supports the potential presence of large floating Arctic ice shelves during the PGM. The existence of different glacial 'modes' calls for focussed research on the complex processes behind ice-age development. We present a glacioisostatic assessment to demonstrate how a different PGM ice-sheet configuration might affect sea-level estimates for the last interglacial. Results suggest that this may alter existing last interglacial sea-level estimates, which often use an LGM-like ice configuration, by several metres (likely upward).

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“…Second, polar ice sheets have been very sensitive to past increases in global mean temperature of 1° C above the pre-Industrial Era level. And third, given that Greenland only partially melted during that time window, the high sea levels would have required approximately 5 m worth of sea level rise from melting of the Antarctic ice sheet (Dutton et al 2015b). Relating these global numbers to the state of Florida, sea level rise during the last interglacial period inundated a significant fraction of the state, including most of South Florida (Fig.…”

Section: Sea Level Changes On Geological Time Scalesmentioning

confidence: 99%

Sea Level Rise

Mitchum¹,

Dutton²,

Chambers³

et al. 2017

Florida’s Climate: Changes, Variations, &Amp; Impacts

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Sea level rise is naturally a topic of concern to many Floridians. Our intention in this chapter is to give the reader enough information on this topic to inform decisions Key Messages• Unless greenhouse gas emissions are reduced, sea level will most likely increase by 1-2 meters over the next 50 to 100 years. The time scale is not certain, but the ultimate rise of sea level is. The only way to mitigate this risk is to reduce greenhouse gas emissions as soon as possible and to commit to lowered emissions in the future.• The linkage between greenhouse emissions and sea level rise in incontrovertible. Sea level rise projections are often misinterpreted due a lack of understanding of this point. We cannot invoke any particular sea level rise projection without committing to the emission scenario associated with that sea level rise projection. The scatter seen in charts projecting sea level rise is due to the differing emission scenarios assumed, and is not due to uncertainty in the climate science that underlies the projections.• On shorter time scales of a few years to a few decades, sea level rise fluctuations due to oceanic and atmospheric changes and vertical land motion can substantially increase the frequency of nuisance flooding events. Although these smaller sea level changes are likely ephemeral, these events can have large economic impacts.• Sea level rise impacts in coming decades will be felt differently in different communities. Regional to local adaptations should be developed based on the best available science, and to support these efforts, scientists need to be involved at the local level. We do not discuss this point in our chapter, but would argue that an important outcome of this book is that local scientists, practitioners, and decision makers will have the information needed to inform at the local level.

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Tropical tales of polar ice: evidence of Last Interglacial polar ice sheet retreat recorded by fossil reefs of the granitic Seychelles islands

Cited by 105 publications

References 67 publications

The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

The PMIP4 contribution to CMIP6 – Part 2: Two interglacials, scientific objective and experimental design for Holocene and Last Interglacial simulations

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Sea Level Rise

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