Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record
The Dansgaard–Oeschger (DO) events, as observed in oxygen isotope ratios from the North Greenland Ice Core Project (NGRIP) record, are an outstanding example of past abrupt climate transitions. Their physical cause remains debated, and previous research indicated that they are not preceded by classi...
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ftpotsdamik:oai:publications.pik-potsdam.de:item_22990 2023-10-29T02:35:54+01:00 Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record Boers, N. 2018 application/pdf https://publications.pik-potsdam.de/pubman/item/item_22990 https://publications.pik-potsdam.de/pubman/item/item_22990_1/component/file_22991/8403oa.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-018-04881-7 https://publications.pik-potsdam.de/pubman/item/item_22990 https://publications.pik-potsdam.de/pubman/item/item_22990_1/component/file_22991/8403oa.pdf info:eu-repo/semantics/openAccess Nature Communications info:eu-repo/semantics/article 2018 ftpotsdamik https://doi.org/10.1038/s41467-018-04881-7 2023-09-30T17:59:47Z The Dansgaard–Oeschger (DO) events, as observed in oxygen isotope ratios from the North Greenland Ice Core Project (NGRIP) record, are an outstanding example of past abrupt climate transitions. Their physical cause remains debated, and previous research indicated that they are not preceded by classical early-warning signals (EWS). Subsequent research hypothesized that the DO events are caused by bifurcations of physical mechanisms operating at decadal timescales, and proposed to search for EWS in the high-frequency fluctuation levels. Here, a time series with 5-year resolution is obtained from the raw NGRIP record, and significant numbers of EWS in terms of variance and autocorrelation increases are revealed in the decadal-scale variability. Wavelet analysis indicates that the EWS are most pronounced in the 10–50-year periodicity band, confirming the above hypothesis. The DO events are hence neither directly noise-induced nor purely externally forced, which provides valuable constraints regarding potential physical causes. Article in Journal/Newspaper Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project Publication Database PIK (Potsdam Institute for Climate Impact Research) Nature Communications 9 1 |
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Publication Database PIK (Potsdam Institute for Climate Impact Research) |
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The Dansgaard–Oeschger (DO) events, as observed in oxygen isotope ratios from the North Greenland Ice Core Project (NGRIP) record, are an outstanding example of past abrupt climate transitions. Their physical cause remains debated, and previous research indicated that they are not preceded by classical early-warning signals (EWS). Subsequent research hypothesized that the DO events are caused by bifurcations of physical mechanisms operating at decadal timescales, and proposed to search for EWS in the high-frequency fluctuation levels. Here, a time series with 5-year resolution is obtained from the raw NGRIP record, and significant numbers of EWS in terms of variance and autocorrelation increases are revealed in the decadal-scale variability. Wavelet analysis indicates that the EWS are most pronounced in the 10–50-year periodicity band, confirming the above hypothesis. The DO events are hence neither directly noise-induced nor purely externally forced, which provides valuable constraints regarding potential physical causes. |
format |
Article in Journal/Newspaper |
author |
Boers, N. |
spellingShingle |
Boers, N. Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
author_facet |
Boers, N. |
author_sort |
Boers, N. |
title |
Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
title_short |
Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
title_full |
Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
title_fullStr |
Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
title_full_unstemmed |
Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
title_sort |
early-warning signals for dansgaard-oeschger events in a high-resolution ice core record |
publishDate |
2018 |
url |
https://publications.pik-potsdam.de/pubman/item/item_22990 https://publications.pik-potsdam.de/pubman/item/item_22990_1/component/file_22991/8403oa.pdf |
genre |
Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Nature Communications |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41467-018-04881-7 https://publications.pik-potsdam.de/pubman/item/item_22990 https://publications.pik-potsdam.de/pubman/item/item_22990_1/component/file_22991/8403oa.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-018-04881-7 |
container_title |
Nature Communications |
container_volume |
9 |
container_issue |
1 |
_version_ |
1781059386651705344 |