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Model evidence for a seasonal bias in Antarctic ice cores

Much of the global annual mean temperature change over Quaternary glacial cycles can be attributed to slow ice sheet and greenhouse gas feedbacks, but analysis of the short-term response to orbital forcings has the potential to reveal key relationships in the climate system. In particular, obliquity...

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Autores principales: Erb, Michael P., Jackson, Charles S., Broccoli, Anthony J., Lea, David W., Valdes, Paul J., Crucifix, Michel, DiNezio, Pedro N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5893564/
https://www.ncbi.nlm.nih.gov/pubmed/29636470
http://dx.doi.org/10.1038/s41467-018-03800-0
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author Erb, Michael P.
Jackson, Charles S.
Broccoli, Anthony J.
Lea, David W.
Valdes, Paul J.
Crucifix, Michel
DiNezio, Pedro N.
author_facet Erb, Michael P.
Jackson, Charles S.
Broccoli, Anthony J.
Lea, David W.
Valdes, Paul J.
Crucifix, Michel
DiNezio, Pedro N.
author_sort Erb, Michael P.
collection PubMed
description Much of the global annual mean temperature change over Quaternary glacial cycles can be attributed to slow ice sheet and greenhouse gas feedbacks, but analysis of the short-term response to orbital forcings has the potential to reveal key relationships in the climate system. In particular, obliquity and precession both produce highly seasonal temperature responses at high latitudes. Here, idealized single-forcing model experiments are used to quantify Earth’s response to obliquity, precession, CO(2), and ice sheets, and a linear reconstruction methodology is used to compare these responses to long proxy records around the globe. This comparison reveals mismatches between the annual mean response to obliquity and precession in models versus the signals within Antarctic ice cores. Weighting the model-based reconstruction toward austral winter or spring reduces these discrepancies, providing evidence for a seasonal bias in ice cores.
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spelling pubmed-58935642018-04-13 Model evidence for a seasonal bias in Antarctic ice cores Erb, Michael P. Jackson, Charles S. Broccoli, Anthony J. Lea, David W. Valdes, Paul J. Crucifix, Michel DiNezio, Pedro N. Nat Commun Article Much of the global annual mean temperature change over Quaternary glacial cycles can be attributed to slow ice sheet and greenhouse gas feedbacks, but analysis of the short-term response to orbital forcings has the potential to reveal key relationships in the climate system. In particular, obliquity and precession both produce highly seasonal temperature responses at high latitudes. Here, idealized single-forcing model experiments are used to quantify Earth’s response to obliquity, precession, CO(2), and ice sheets, and a linear reconstruction methodology is used to compare these responses to long proxy records around the globe. This comparison reveals mismatches between the annual mean response to obliquity and precession in models versus the signals within Antarctic ice cores. Weighting the model-based reconstruction toward austral winter or spring reduces these discrepancies, providing evidence for a seasonal bias in ice cores. Nature Publishing Group UK 2018-04-10 /pmc/articles/PMC5893564/ /pubmed/29636470 http://dx.doi.org/10.1038/s41467-018-03800-0 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Erb, Michael P.
Jackson, Charles S.
Broccoli, Anthony J.
Lea, David W.
Valdes, Paul J.
Crucifix, Michel
DiNezio, Pedro N.
Model evidence for a seasonal bias in Antarctic ice cores
title Model evidence for a seasonal bias in Antarctic ice cores
title_full Model evidence for a seasonal bias in Antarctic ice cores
title_fullStr Model evidence for a seasonal bias in Antarctic ice cores
title_full_unstemmed Model evidence for a seasonal bias in Antarctic ice cores
title_short Model evidence for a seasonal bias in Antarctic ice cores
title_sort model evidence for a seasonal bias in antarctic ice cores
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5893564/
https://www.ncbi.nlm.nih.gov/pubmed/29636470
http://dx.doi.org/10.1038/s41467-018-03800-0
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