Evolution of the Southern Annular Mode during the past millennium
International audience The Southern Annular Mode (SAM) is the primary pattern of climate variability in the Southern Hemisphere1,2, influencing latitudinal rainfall distribution and temperatures from the subtropics to Antarctica. The positive summer trend in the SAM over recent decades is widely att...
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ftinsu:oai:HAL:hal-02050242v1 2024-04-28T08:00:41+00:00 Evolution of the Southern Annular Mode during the past millennium Abram, Nerilie J. Mulvaney, Robert Vimeux, Françoise Phipps, Steven J. Turner, John England, Matthew H. Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2014 https://hal.science/hal-02050242 https://doi.org/10.1038/NCLIMATE2235 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/NCLIMATE2235 hal-02050242 https://hal.science/hal-02050242 doi:10.1038/NCLIMATE2235 ISSN: 1758-678X EISSN: 1758-6798 Nature Climate Change https://hal.science/hal-02050242 Nature Climate Change, 2014, 4 (7), pp.564--569. ⟨10.1038/NCLIMATE2235⟩ Diversity MLSA Phylogeny Taxonomy Tissierella [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology info:eu-repo/semantics/article Journal articles 2014 ftinsu https://doi.org/10.1038/NCLIMATE2235 2024-04-05T00:44:36Z International audience The Southern Annular Mode (SAM) is the primary pattern of climate variability in the Southern Hemisphere1,2, influencing latitudinal rainfall distribution and temperatures from the subtropics to Antarctica. The positive summer trend in the SAM over recent decades is widely attributed to stratospheric ozone depletion2; however, the brevity of observational records from Antarctica1\textemdashone of the core zones that defines SAM variability\textemdashlimits our understanding of long-term SAM behaviour. Here we reconstruct annual mean changes in the SAM since AD 1000 using, for the first time, proxy records that encompass the full mid-latitude to polar domain across the Drake Passage sector. We find that the SAM has undergone a progressive shift towards its positive phase since the fifteenth century, causing cooling of the main Antarctic continent at the same time that the Antarctic Peninsula has warmed. The positive trend in the SAM since ~AD 1940 is reproduced by multimodel climate simulations forced with rising greenhouse gas levels and later ozone depletion, and the long-term average SAM index is now at its highest level for at least the past 1,000 years. Reconstructed SAM trends before the twentieth century are more prominent than those in radiative-forcing climate experiments and may be associated with a teleconnected response to tropical Pacific climate. Our findings imply that predictions of further greenhouse-driven increases in the SAM over the coming century3 also need to account for the possibility of opposing effects from tropical Pacific climate changes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Institut national des sciences de l'Univers: HAL-INSU Nature Climate Change 4 7 564 569 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Diversity MLSA Phylogeny Taxonomy Tissierella [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology |
spellingShingle |
Diversity MLSA Phylogeny Taxonomy Tissierella [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology Abram, Nerilie J. Mulvaney, Robert Vimeux, Françoise Phipps, Steven J. Turner, John England, Matthew H. Evolution of the Southern Annular Mode during the past millennium |
topic_facet |
Diversity MLSA Phylogeny Taxonomy Tissierella [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology |
description |
International audience The Southern Annular Mode (SAM) is the primary pattern of climate variability in the Southern Hemisphere1,2, influencing latitudinal rainfall distribution and temperatures from the subtropics to Antarctica. The positive summer trend in the SAM over recent decades is widely attributed to stratospheric ozone depletion2; however, the brevity of observational records from Antarctica1\textemdashone of the core zones that defines SAM variability\textemdashlimits our understanding of long-term SAM behaviour. Here we reconstruct annual mean changes in the SAM since AD 1000 using, for the first time, proxy records that encompass the full mid-latitude to polar domain across the Drake Passage sector. We find that the SAM has undergone a progressive shift towards its positive phase since the fifteenth century, causing cooling of the main Antarctic continent at the same time that the Antarctic Peninsula has warmed. The positive trend in the SAM since ~AD 1940 is reproduced by multimodel climate simulations forced with rising greenhouse gas levels and later ozone depletion, and the long-term average SAM index is now at its highest level for at least the past 1,000 years. Reconstructed SAM trends before the twentieth century are more prominent than those in radiative-forcing climate experiments and may be associated with a teleconnected response to tropical Pacific climate. Our findings imply that predictions of further greenhouse-driven increases in the SAM over the coming century3 also need to account for the possibility of opposing effects from tropical Pacific climate changes. |
author2 |
Hydrosciences Montpellier (HSM) Institut de Recherche pour le Développement (IRD)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Glaces et Continents, Climats et Isotopes Stables (GLACCIOS) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Article in Journal/Newspaper |
author |
Abram, Nerilie J. Mulvaney, Robert Vimeux, Françoise Phipps, Steven J. Turner, John England, Matthew H. |
author_facet |
Abram, Nerilie J. Mulvaney, Robert Vimeux, Françoise Phipps, Steven J. Turner, John England, Matthew H. |
author_sort |
Abram, Nerilie J. |
title |
Evolution of the Southern Annular Mode during the past millennium |
title_short |
Evolution of the Southern Annular Mode during the past millennium |
title_full |
Evolution of the Southern Annular Mode during the past millennium |
title_fullStr |
Evolution of the Southern Annular Mode during the past millennium |
title_full_unstemmed |
Evolution of the Southern Annular Mode during the past millennium |
title_sort |
evolution of the southern annular mode during the past millennium |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.science/hal-02050242 https://doi.org/10.1038/NCLIMATE2235 |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage |
op_source |
ISSN: 1758-678X EISSN: 1758-6798 Nature Climate Change https://hal.science/hal-02050242 Nature Climate Change, 2014, 4 (7), pp.564--569. ⟨10.1038/NCLIMATE2235⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/NCLIMATE2235 hal-02050242 https://hal.science/hal-02050242 doi:10.1038/NCLIMATE2235 |
op_doi |
https://doi.org/10.1038/NCLIMATE2235 |
container_title |
Nature Climate Change |
container_volume |
4 |
container_issue |
7 |
container_start_page |
564 |
op_container_end_page |
569 |
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1797572795731804160 |