Polar amplification of orbital-scale climate variability  in the early Eocene greenhouse world

Fokkema, Chris D.; Agterhuis, Tobias; Gerritsma, Danielle; de Goeij, Myrthe; Liu, Xiaoqing; de Regt, Pauline; Rice, Addison; Vennema, Laurens; Agnini, Claudia; Bijl, Peter K.; Frieling, Joost; Huber, Matthew; Peterse, Francien; Sluijs, Appy

doi:https://doi.org/10.5194/cp-20-1303-2024

Articles | Volume 20, issue 6

https://doi.org/10.5194/cp-20-1303-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/cp-20-1303-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 6

Research article

|

12 Jun 2024

Research article |

| 12 Jun 2024

Polar amplification of orbital-scale climate variability in the early Eocene greenhouse world

Chris D. Fokkema, Tobias Agterhuis, Danielle Gerritsma, Myrthe de Goeij, Xiaoqing Liu, Pauline de Regt, Addison Rice, Laurens Vennema, Claudia Agnini, Peter K. Bijl, Joost Frieling, Matthew Huber, Francien Peterse, and Appy Sluijs

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Jan 2024	40	6	2	48
Feb 2024	22	7	0	29
Mar 2024	82	17	8	107
Apr 2024	40	4	1	45
May 2024	31	18	8	57
Jun 2024	484	94	15	593
Jul 2024	859	84	10	953
Aug 2024	117	11	4	132
Sep 2024	70	16	0	86
Oct 2024	77	13	3	93
Nov 2024	41	16	1	58
Dec 2024	43	13	1	57
Jan 2025	56	12	5	73
Feb 2025	35	12	3	50
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Apr 2025	48	22	0	70
May 2025	43	6	1	50

Cumulative views and downloads (calculated since 18 Sep 2023)

Month	HTML	PDF	XML	Total
Sep 2023	166	92	8	266
Oct 2023	53	24	0	77
Nov 2023	21	6	1	28
Dec 2023	31	12	5	48
Jan 2024	40	6	2	48
Feb 2024	22	7	0	29
Mar 2024	82	17	8	107
Apr 2024	40	4	1	45
May 2024	31	18	8	57
Jun 2024	484	94	15	593
Jul 2024	859	84	10	953
Aug 2024	117	11	4	132
Sep 2024	70	16	0	86
Oct 2024	77	13	3	93
Nov 2024	41	16	1	58
Dec 2024	43	13	1	57
Jan 2025	56	12	5	73
Feb 2025	35	12	3	50
Mar 2025	62	13	0	75
Apr 2025	48	22	0	70
May 2025	43	6	1	50

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Short summary

Polar amplification (PA) is a key uncertainty in climate projections. The factors that dominantly control PA are difficult to separate. Here we provide an estimate for the non-ice-related PA by reconstructing tropical ocean temperature variability from the ice-free early Eocene, which we compare to deep-ocean-derived high-latitude temperature variability across short-lived warming periods. We find a PA factor of 1.7–2.3 on 20 kyr timescales, which is somewhat larger than model estimates.