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...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
London : Nature Publishing Group
2018
|
Subjects: | |
Online Access: | https://oa.tib.eu/renate/handle/123456789/5139 https://doi.org/10.34657/3768 |
id |
fttibhannoverren:oai:oa.tib.eu:123456789/5139 |
---|---|
record_format |
openpolar |
spelling |
fttibhannoverren:oai:oa.tib.eu:123456789/5139 2024-09-09T19:37:46+00:00 Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record Boers, N. 2018 application/pdf https://oa.tib.eu/renate/handle/123456789/5139 https://doi.org/10.34657/3768 eng eng London : Nature Publishing Group DOI:https://doi.org/10.1038/s41467-018-04881-7 https://oa.tib.eu/renate/handle/123456789/5139 https://doi.org/10.34657/3768 CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich ddc:550 Dansgaard–Oeschger (DO) events North Greenland Ice Core Project (NGRIP) climate change status-type:publishedVersion doc-type:Article doc-type:Text 2018 fttibhannoverren https://doi.org/10.34657/376810.1038/s41467-018-04881-7 2024-07-03T23:33:53Z 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 Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Greenland |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
ddc:550 Dansgaard–Oeschger (DO) events North Greenland Ice Core Project (NGRIP) climate change |
spellingShingle |
ddc:550 Dansgaard–Oeschger (DO) events North Greenland Ice Core Project (NGRIP) climate change Boers, N. Early-warning signals for Dansgaard-Oeschger events in a high-resolution ice core record |
topic_facet |
ddc:550 Dansgaard–Oeschger (DO) events North Greenland Ice Core Project (NGRIP) climate change |
description |
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. |
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 |
publisher |
London : Nature Publishing Group |
publishDate |
2018 |
url |
https://oa.tib.eu/renate/handle/123456789/5139 https://doi.org/10.34657/3768 |
geographic |
Greenland |
geographic_facet |
Greenland |
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_relation |
DOI:https://doi.org/10.1038/s41467-018-04881-7 https://oa.tib.eu/renate/handle/123456789/5139 https://doi.org/10.34657/3768 |
op_rights |
CC BY 4.0 Unported https://creativecommons.org/licenses/by/4.0/ frei zugänglich |
op_doi |
https://doi.org/10.34657/376810.1038/s41467-018-04881-7 |
_version_ |
1809906863820505088 |