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The marine δ18O rec...
The marine δ18O record overestimates continental ice volume during Marine Isotope Stage 3
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- Dalton, April S. (författare)
- Department of Physical Geography and Geoecology, Charles University, Prague, Czech Republic
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- Pico, Tamara (författare)
- Caltech, Pasadena, CA, United States
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- Gowan, Evan J. (författare)
- Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; MARUM, University of Bremen, Bremen, Germany ; Department of Earth and Environmental Sciences, Kumamoto University, Kumamoto, Japan
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- Clague, John J. (författare)
- Department of Earth Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
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- Forman, Steven L. (författare)
- Department of Geosciences, Baylor University, Waco, TX, United States
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- McMartin, Isabelle (författare)
- Geological Survey of Canada, Natural Resources Canada, Ottawa, Ontario, Canada
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- Sarala, Pertti (författare)
- Oulu Mining School, P.O. Box 3000, FI-90014, University of Oulu, Finland; Geological Survey of Finland, P.O. Box 77, FI-96101 Rovaniemi, Finland
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- Helmens, Karin (författare)
- Naturhistoriska riksmuseet,Enheten för paleobiologi
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(creator_code:org_t)
- Amsterdam : Elsevier, 2022
- 2022
- Engelska.
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Ingår i: Global and Planetary Change. - Amsterdam : Elsevier. - 0921-8181 .- 1872-6364. ; 212, s. 103814-103814
- Relaterad länk:
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https://www.scienced...
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https://nrm.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- There is disagreement in the Quaternary research community in how much of the marine δ18O signal is driven by change in ice volume. Here, we examine this topic by bringing together empirical and modelling work for Marine Isotope Stage 3 (MIS 3; 57 ka to 29 ka), a time when the marine δ18O record indicates moderate continental glaciation and a global mean sea level between −60 m and −90 m. We compile and interpret geological data dating to MIS 3 to constrain the extent of major Northern Hemisphere ice sheets (Eurasian, Laurentide, Cordilleran). Many key data, especially published in the past ~15 years, argue for an ice-free core of the formerly glaciated regions that is inconsistent with inferences from the marine δ18O record. We compile results from prior studies of glacial isostatic adjustment to show the volume of ice inferred from the marine δ18O record is unable to fit within the plausible footprint of Northern Hemisphere ice sheets during MIS 3. Instead, a global mean sea level between −30 m and − 50 m is inferred from geological constraints and glacial isostatic modelling. Furthermore, limited North American ice volumes during MIS 3 are consistent with most sea-level bounds through that interval. We can find no concrete evidence of large-scale glaciation during MIS 3 that could account for the missing ~30 m of sea-level equivalent during that time, which suggests that changes in the marine δ18O record are driven by other variables, including water temperature. This work urges caution regarding the reliance of the marine δ18O record as a de facto indicator of continental ice when few geological constraints are available, which underpins many Quaternary studies.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
Nyckelord
- Mid-Wisconsinan
- Mid-Weichselian
- Global mean sea level
- Fennoscandian
- Laurentide
- Cordilleran
- The changing Earth
- Den föränderliga jorden
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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