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Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse
The early Eocene Climatic Optimum (EECO) represents the peak of Earth’s last sustained greenhouse climate interval. To investigate hydroclimate variability in western North America during the EECO, we developed an orbitally resolved leaf wax δ(2)H record from one of the most well-dated terrestrial p...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10403199/ https://www.ncbi.nlm.nih.gov/pubmed/37540746 http://dx.doi.org/10.1126/sciadv.adg8022 |
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author | Walters, Andrew P. Tierney, Jessica E. Zhu, Jiang Meyers, Stephen R. Graves, Katherine Carroll, Alan R. |
author_facet | Walters, Andrew P. Tierney, Jessica E. Zhu, Jiang Meyers, Stephen R. Graves, Katherine Carroll, Alan R. |
author_sort | Walters, Andrew P. |
collection | PubMed |
description | The early Eocene Climatic Optimum (EECO) represents the peak of Earth’s last sustained greenhouse climate interval. To investigate hydroclimate variability in western North America during the EECO, we developed an orbitally resolved leaf wax δ(2)H record from one of the most well-dated terrestrial paleoclimate archives, the Green River Formation. Our δ(2)H(wax) results show ∼60‰ variation and evidence for eccentricity and precession forcing. iCESM simulations indicate that changes in the Earth’s orbit drive large seasonal variations in precipitation and δ(2)H of precipitation at our study site, primarily during the summer season. Our findings suggest that the astronomical response in δ(2)H(wax) is attributable to an asymmetrical climate response to the seasonal cycle, a “clipping” of precession forcing, and asymmetric carbon cycle dynamics, which further enhance the influence of eccentricity modulation on the hydrological cycle during the EECO. More broadly, our study provides an explanation for how and why eccentricity emerges as a dominant frequency in climate records from ice-free greenhouse worlds. |
format | Online Article Text |
id | pubmed-10403199 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-104031992023-08-05 Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse Walters, Andrew P. Tierney, Jessica E. Zhu, Jiang Meyers, Stephen R. Graves, Katherine Carroll, Alan R. Sci Adv Earth, Environmental, Ecological, and Space Sciences The early Eocene Climatic Optimum (EECO) represents the peak of Earth’s last sustained greenhouse climate interval. To investigate hydroclimate variability in western North America during the EECO, we developed an orbitally resolved leaf wax δ(2)H record from one of the most well-dated terrestrial paleoclimate archives, the Green River Formation. Our δ(2)H(wax) results show ∼60‰ variation and evidence for eccentricity and precession forcing. iCESM simulations indicate that changes in the Earth’s orbit drive large seasonal variations in precipitation and δ(2)H of precipitation at our study site, primarily during the summer season. Our findings suggest that the astronomical response in δ(2)H(wax) is attributable to an asymmetrical climate response to the seasonal cycle, a “clipping” of precession forcing, and asymmetric carbon cycle dynamics, which further enhance the influence of eccentricity modulation on the hydrological cycle during the EECO. More broadly, our study provides an explanation for how and why eccentricity emerges as a dominant frequency in climate records from ice-free greenhouse worlds. American Association for the Advancement of Science 2023-08-04 /pmc/articles/PMC10403199/ /pubmed/37540746 http://dx.doi.org/10.1126/sciadv.adg8022 Text en Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Earth, Environmental, Ecological, and Space Sciences Walters, Andrew P. Tierney, Jessica E. Zhu, Jiang Meyers, Stephen R. Graves, Katherine Carroll, Alan R. Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title | Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title_full | Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title_fullStr | Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title_full_unstemmed | Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title_short | Climate system asymmetries drive eccentricity pacing of hydroclimate during the early Eocene greenhouse |
title_sort | climate system asymmetries drive eccentricity pacing of hydroclimate during the early eocene greenhouse |
topic | Earth, Environmental, Ecological, and Space Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10403199/ https://www.ncbi.nlm.nih.gov/pubmed/37540746 http://dx.doi.org/10.1126/sciadv.adg8022 |
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