Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions
Rohling, Eelco J; Hibbert, Fiona D.; Williams, Felicity H.; Grant, Katharine M; Marino, Gianluca; Foster, Gavin L; Hennekam, Rick; de Lange, Gert J.; Roberts, Andrew P.; Yu, Jimin; Webster, Jody M.; Yokoyama, Yusuke
(2017) Quaternary Science Reviews, volume 176, pp. 1 - 28
(Article)
Abstract
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 sea-level reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms
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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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Keywords: Arctic ice shelf, Glacioisostatic adjustment, Ice volume, Last Glacial Maximum, Last Interglacial, Penultimate Glacial Maximum, Sea level, δO, Global and Planetary Change, Ecology, Evolution, Behavior and Systematics, Archaeology, Archaeology, Geology
ISSN: 0277-3791
Publisher: Elsevier Limited
(Peer reviewed)
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