Buchumschlag

A new sea-level record for the Neogene/Quaternary boundary reveals transition to a more stable East Antarctic Ice Sheet

Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth’s cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Jakob, Kim (VerfasserIn) , Wilson, Paul A. (VerfasserIn) , Pross, Jörg (VerfasserIn) , Ezard, Thomas H. G. (VerfasserIn) , Fiebig, Jens (VerfasserIn) , Repschläger, Janne (VerfasserIn) , Friedrich, Oliver (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: November 23, 2020
In: Proceedings of the National Academy of Sciences of the United States of America
Year: 2020, Jahrgang: 117, Heft: 49, Pages: 30980-30987
ISSN:1091-6490
DOI:10.1073/pnas.2004209117
Online-Zugang:lizenzpflichtig
lizenzpflichtig
Volltext
Verfasserangaben:Kim A. Jakob, Paul A. Wilson, Jörg Pross, Thomas H.G. Ezard, Jens Fiebig, Janne Repschläger, and Oliver Friedrich
Beschreibung
Zusammenfassung:Sea-level rise resulting from the instability of polar continental ice sheets represents a major socioeconomic hazard arising from anthropogenic warming, but the response of the largest component of Earth’s cryosphere, the East Antarctic Ice Sheet (EAIS), to global warming is poorly understood. Here we present a detailed record of North Atlantic deep-ocean temperature, global sea-level, and ice-volume change for ∼2.75 to 2.4 Ma ago, when atmospheric partial pressure of carbon dioxide (pCO2) ranged from present-day (>400 parts per million volume, ppmv) to preindustrial (<280 ppmv) values. Our data reveal clear glacial-interglacial cycles in global ice volume and sea level largely driven by the growth and decay of ice sheets in the Northern Hemisphere. Yet, sea-level values during Marine Isotope Stage (MIS) 101 (∼2.55 Ma) also signal substantial melting of the EAIS, and peak sea levels during MIS G7 (∼2.75 Ma) and, perhaps, MIS G1 (∼2.63 Ma) are also suggestive of EAIS instability. During the succeeding glacial-interglacial cycles (MIS 100 to 95), sea levels were distinctly lower than before, strongly suggesting a link between greater stability of the EAIS and increased land-ice volumes in the Northern Hemisphere. We propose that lower sea levels driven by ice-sheet growth in the Northern Hemisphere decreased EAIS susceptibility to ocean melting. Our findings have implications for future EAIS vulnerability to a rapidly warming world.
Beschreibung:Published first November 23, 2020
Gesehen am 07.10.2021
Beschreibung:Online Resource
ISSN:1091-6490
DOI:10.1073/pnas.2004209117

Ähnliche Einträge