Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations
Improved understanding of the drivers of climate variability, particularly over the last millennium, and its influence on Antarctic ice melt have important implications for projecting ice sheet resilience in a changing climate. Here, we investigated the variability in Antarctic climate and sea ice e...
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ftdoajarticles:oai:doaj.org/article:bf1fc3a2c82841a99223c66052325c95 2024-01-07T09:40:06+01:00 Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations Olivia J. Truax Bette L. Otto-Bliesner Esther C. Brady Craig L. Stevens Gary S. Wilson Christina R. Riesselman 2022-07-01T00:00:00Z https://doi.org/10.3390/geosciences12080299 https://doaj.org/article/bf1fc3a2c82841a99223c66052325c95 EN eng MDPI AG https://www.mdpi.com/2076-3263/12/8/299 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences12080299 2076-3263 https://doaj.org/article/bf1fc3a2c82841a99223c66052325c95 Geosciences, Vol 12, Iss 8, p 299 (2022) last millennium Antarctica Antarctic dipole Little Ice Age Medieval Climate Anomaly CESM-LME simulations Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.3390/geosciences12080299 2023-12-10T01:44:50Z Improved understanding of the drivers of climate variability, particularly over the last millennium, and its influence on Antarctic ice melt have important implications for projecting ice sheet resilience in a changing climate. Here, we investigated the variability in Antarctic climate and sea ice extent during the last millennium (850–1850 CE) by comparing paleoenvironmental reconstructions with simulations from the Community Earth System Model Last Millennium Ensemble (CESM-LME). Atmospheric and oceanic response to external forcing in CESM-LME simulations typically take the form of an Antarctic dipole: cooling over most of Antarctica and warming east of the Antarctic Peninsula. This configuration is also observed in ice core records. Unforced variability and a dipole response to large volcanic eruptions contribute to weaker cooling in the Antarctic than the Arctic, consistent with the absence of a strong volcanic signal in Antarctic ice core records. The ensemble does not support a clear link between the dipole pattern and baseline shifts in the Southern Annular Mode and El Niño-Southern Oscillation proposed by some paleoclimate reconstructions. Our analysis provides a point of comparison for paleoclimate reconstructions and highlights the role of internal climate variability in driving modeled last millennium climate evolution in the Antarctic. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Arctic ice core Ice Sheet Sea ice Directory of Open Access Journals: DOAJ Articles Antarctic Antarctic Peninsula Arctic The Antarctic Geosciences 12 8 299 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
last millennium Antarctica Antarctic dipole Little Ice Age Medieval Climate Anomaly CESM-LME simulations Geology QE1-996.5 |
spellingShingle |
last millennium Antarctica Antarctic dipole Little Ice Age Medieval Climate Anomaly CESM-LME simulations Geology QE1-996.5 Olivia J. Truax Bette L. Otto-Bliesner Esther C. Brady Craig L. Stevens Gary S. Wilson Christina R. Riesselman Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
topic_facet |
last millennium Antarctica Antarctic dipole Little Ice Age Medieval Climate Anomaly CESM-LME simulations Geology QE1-996.5 |
description |
Improved understanding of the drivers of climate variability, particularly over the last millennium, and its influence on Antarctic ice melt have important implications for projecting ice sheet resilience in a changing climate. Here, we investigated the variability in Antarctic climate and sea ice extent during the last millennium (850–1850 CE) by comparing paleoenvironmental reconstructions with simulations from the Community Earth System Model Last Millennium Ensemble (CESM-LME). Atmospheric and oceanic response to external forcing in CESM-LME simulations typically take the form of an Antarctic dipole: cooling over most of Antarctica and warming east of the Antarctic Peninsula. This configuration is also observed in ice core records. Unforced variability and a dipole response to large volcanic eruptions contribute to weaker cooling in the Antarctic than the Arctic, consistent with the absence of a strong volcanic signal in Antarctic ice core records. The ensemble does not support a clear link between the dipole pattern and baseline shifts in the Southern Annular Mode and El Niño-Southern Oscillation proposed by some paleoclimate reconstructions. Our analysis provides a point of comparison for paleoclimate reconstructions and highlights the role of internal climate variability in driving modeled last millennium climate evolution in the Antarctic. |
format |
Article in Journal/Newspaper |
author |
Olivia J. Truax Bette L. Otto-Bliesner Esther C. Brady Craig L. Stevens Gary S. Wilson Christina R. Riesselman |
author_facet |
Olivia J. Truax Bette L. Otto-Bliesner Esther C. Brady Craig L. Stevens Gary S. Wilson Christina R. Riesselman |
author_sort |
Olivia J. Truax |
title |
Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
title_short |
Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
title_full |
Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
title_fullStr |
Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
title_full_unstemmed |
Drivers of Last Millennium Antarctic Climate Evolution in an Ensemble of Community Earth System Model Simulations |
title_sort |
drivers of last millennium antarctic climate evolution in an ensemble of community earth system model simulations |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/geosciences12080299 https://doaj.org/article/bf1fc3a2c82841a99223c66052325c95 |
geographic |
Antarctic Antarctic Peninsula Arctic The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Arctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic ice core Ice Sheet Sea ice |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic ice core Ice Sheet Sea ice |
op_source |
Geosciences, Vol 12, Iss 8, p 299 (2022) |
op_relation |
https://www.mdpi.com/2076-3263/12/8/299 https://doaj.org/toc/2076-3263 doi:10.3390/geosciences12080299 2076-3263 https://doaj.org/article/bf1fc3a2c82841a99223c66052325c95 |
op_doi |
https://doi.org/10.3390/geosciences12080299 |
container_title |
Geosciences |
container_volume |
12 |
container_issue |
8 |
container_start_page |
299 |
_version_ |
1787430509405536256 |