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  The Effect of Past Saturation Changes on Noble Gas Reconstructions of Mean Ocean Temperature

Pöppelmeier, F., Baggenstos, D., Grimmer, M., Liu, Z., Schmitt, J., Fischer, H., Stocker, T. F. (2023): The Effect of Past Saturation Changes on Noble Gas Reconstructions of Mean Ocean Temperature. - Geophysical Research Letters, 50, 6, e2022GL102055.
https://doi.org/10.1029/2022GL102055

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Pöppelmeier, Frerk1, Autor
Baggenstos, Daniel1, Autor
Grimmer, Markus1, Autor
Liu, Zhijun2, Autor              
Schmitt, Jochen1, Autor
Fischer, Hubertus1, Autor
Stocker, Thomas F.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
21.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146027              

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Schlagwörter: mean ocean temperature; last glacial maximum; noble gases; ocean modelling
 Zusammenfassung: The ocean's immense ability to store and release heat on centennial to millennial time scales modulates the impacts of climate perturbations. To gain a better understanding of past variations in mean ocean temperature (MOT), a noble gas-based proxy measured from ancient air in ice cores has been developed. Here we assess non-temperature effects that may influence the atmospheric noble gas ratios reconstructed from polar ice and how they impact the temperature signal with an intermediate complexity Earth system model. We find that changes in wind speed, sea-ice extent, and ocean circulation have partially compensating effects on mean-ocean noble gas saturation, leading to a slight reduction of noble gas undersaturation at the Last Glacial Maximum (LGM). Taking these effects and ice core measurements into account, our model suggests a revised MOT difference between the LGM and pre-industrial of −2.1 ± 0.7°C that is also in improved agreement with other independent temperature reconstructions.

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Sprache(n): eng - Englisch
 Datum: 2023-03-212023
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1029/2022GL102055
GFZPOF: p4 T2 Ocean and Cryosphere
OATYPE: Hybrid Open Access
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Titel: Geophysical Research Letters
Genre der Quelle: Zeitschrift, SCI, Scopus, ab 2023 oa
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Seiten: - Band / Heft: 50 (6) Artikelnummer: e2022GL102055 Start- / Endseite: - Identifikator: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)
Publisher: Wiley