Ice volume and climate changes from a 6000 year sea-level record in French Polynesia.

Hallmann, N., Camoin, G., Eisenhauer, Anton , Botella, A., Milne, G. A., Vella, C., Samankassou, E., Pothin, V., Dussouillez, P., Fleury, J. and Fietzke, Jan (2018) Ice volume and climate changes from a 6000 year sea-level record in French Polynesia. Open Access Nature Communications, 9 (285). DOI 10.1038/s41467-017-02695-7.

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Abstract

Mid- to late-Holocene sea-level records from low-latitude regions serve as an important baseline of natural variability in sea level and global ice volume prior to the Anthropocene. Here, we reconstruct a high-resolution sea-level curve encompassing the last 6000 years based on a comprehensive study of coral microatolls, which are sensitive low-tide recorders. Our curve is based on microatolls from several islands in a single region and comprises a total of 82 sea-level index points. Assuming thermosteric contributions are negligible on millennial time scales, our results constrain global ice melting to be 1.5–2.5 m (sea-level equivalent) since ~5500 years before present. The reconstructed curve includes isolated rapid events of several decimetres within a few centuries, one of which is most likely related to loss from the Antarctic ice sheet mass around 5000 years before present. In contrast, the occurrence of large and flat microatolls indicates periods of significant sea-level stability lasting up to ~300 years.

Document Type: Article
Keywords: Sea level, Uranium, Thorium, dating, Holocene, highstand
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-017-02695-7
ISSN: 2041-1723
Projects: PALSEA2, PAGES, INQUA
Date Deposited: 22 Jan 2018 11:41
Last Modified: 01 Feb 2019 15:13
URI: http://oceanrep.geomar.de/id/eprint/41664

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