Inconclusive early warning signals  for Dansgaard-Oeschger events across  Greenland ice cores

Hummel, Clara; Boers, Niklas; Rypdal, Martin

doi:10.5194/esd-16-2035-2025

Articles | Volume 16, issue 6

https://doi.org/10.5194/esd-16-2035-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/esd-16-2035-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 6

Research article

|

19 Nov 2025

Research article |

| 19 Nov 2025

Inconclusive early warning signals for Dansgaard-Oeschger events across Greenland ice cores

Clara Hummel, Niklas Boers, and Martin Rypdal

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May 2025	46	4	2	52
Jun 2025	62	14	18	94
Jul 2025	38	36	2	76
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Cumulative views and downloads (calculated since 02 Dec 2024)

Month	HTML	PDF	XML	Total
Dec 2024	186	46	12	244
Jan 2025	86	26	14	126
Feb 2025	104	22	8	134
Mar 2025	72	32	6	110
Apr 2025	48	10	2	60
May 2025	46	4	2	52
Jun 2025	62	14	18	94
Jul 2025	38	36	2	76
Aug 2025	170	14	4	188
Sep 2025	1,082	30	2	1,114
Oct 2025	60	16	2	78
Nov 2025	248	53	16	317
Dec 2025	663	57	22	742
Jan 2026	521	75	25	621
Feb 2026	217	20	20	257
Mar 2026	272	81	11	364
Apr 2026	193	30	8	231
May 2026	134	23	7	164
Jun 2026	25	6	1	32
Jul 2026	95	8	2	105

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Short summary

We revisit early warning signals (EWS) for past abrupt climate changes known as Dansgaard-Oeschger (DO) events. Using advanced statistical methods, we find fewer significant EWS than previously reported. While some signals appear consistent across Greenland ice core records, they are not enough to identify the still unknown mechanisms behind DO events. This study highlights the complexity of predicting climate changes and urges caution in interpreting (paleo-)climate data.