No changes in overall AMOC strength in interglacial PMIP4 time slices
The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism of poleward heat transport and an important part of the global climate system. How it responded to past changes in forcing, such as those experienced during Quaternary interglacials, is an intriguing and open question. Previou...
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Copernicus Publications
2023
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fttriple:oai:gotriple.eu:oai:doaj.org/article:cd3adfd4a43544ec9ac07ef486a654a5 2023-05-15T18:18:50+02:00 No changes in overall AMOC strength in interglacial PMIP4 time slices Z. Jiang C. Brierley D. Thornalley S. Sax 2023-01-01 https://doi.org/10.5194/cp-19-107-2023 https://cp.copernicus.org/articles/19/107/2023/cp-19-107-2023.pdf https://doaj.org/article/cd3adfd4a43544ec9ac07ef486a654a5 en eng Copernicus Publications doi:10.5194/cp-19-107-2023 1814-9324 1814-9332 https://cp.copernicus.org/articles/19/107/2023/cp-19-107-2023.pdf https://doaj.org/article/cd3adfd4a43544ec9ac07ef486a654a5 undefined Climate of the Past, Vol 19, Pp 107-121 (2023) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2023 fttriple https://doi.org/10.5194/cp-19-107-2023 2023-01-22T19:26:25Z The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism of poleward heat transport and an important part of the global climate system. How it responded to past changes in forcing, such as those experienced during Quaternary interglacials, is an intriguing and open question. Previous modelling studies suggest an enhanced AMOC in the mid-Holocene compared to the preindustrial period. In earlier simulations from the Palaeoclimate Modelling Intercomparison Project (PMIP), this arose from feedbacks between sea ice and AMOC changes, which were dependent on resolution. Here we present an initial analysis of recently available PMIP4 simulations for three experiments representing different interglacial conditions – one 127 000 years ago within the Last Interglacial (127 ka, called lig127k), one in the middle of the Holocene (midHolocene, 6 ka), and a preindustrial control simulation (piControl, 1850 CE). Both lig127k and midHolocene have altered orbital configurations compared to piControl. The ensemble mean of the PMIP4 models shows the strength of the AMOC does not markedly change between the midHolocene and piControl experiments or between the lig127k and piControl experiments. Therefore, it appears orbital forcing itself does not alter the overall AMOC. We further investigate the coherency of the forced response in AMOC across the two interglacials, along with the strength of the signal, using eight PMIP4 models which performed both interglacial experiments. Only two models show a stronger change with the stronger forcing, but those models disagree on the direction of the change. We propose that the strong signals in these two models are caused by a combination of forcing and the internal variability. After investigating the AMOC changes in the interglacials, we further explored the impact of AMOC on the climate system, especially on the changes in the simulated surface temperature and precipitation. After identifying the AMOC's fingerprint on the surface temperature and rainfall, we demonstrate ... Article in Journal/Newspaper Sea ice Unknown Climate of the Past 19 1 107 121 |
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envir geo Z. Jiang C. Brierley D. Thornalley S. Sax No changes in overall AMOC strength in interglacial PMIP4 time slices |
topic_facet |
envir geo |
description |
The Atlantic Meridional Overturning Circulation (AMOC) is a key mechanism of poleward heat transport and an important part of the global climate system. How it responded to past changes in forcing, such as those experienced during Quaternary interglacials, is an intriguing and open question. Previous modelling studies suggest an enhanced AMOC in the mid-Holocene compared to the preindustrial period. In earlier simulations from the Palaeoclimate Modelling Intercomparison Project (PMIP), this arose from feedbacks between sea ice and AMOC changes, which were dependent on resolution. Here we present an initial analysis of recently available PMIP4 simulations for three experiments representing different interglacial conditions – one 127 000 years ago within the Last Interglacial (127 ka, called lig127k), one in the middle of the Holocene (midHolocene, 6 ka), and a preindustrial control simulation (piControl, 1850 CE). Both lig127k and midHolocene have altered orbital configurations compared to piControl. The ensemble mean of the PMIP4 models shows the strength of the AMOC does not markedly change between the midHolocene and piControl experiments or between the lig127k and piControl experiments. Therefore, it appears orbital forcing itself does not alter the overall AMOC. We further investigate the coherency of the forced response in AMOC across the two interglacials, along with the strength of the signal, using eight PMIP4 models which performed both interglacial experiments. Only two models show a stronger change with the stronger forcing, but those models disagree on the direction of the change. We propose that the strong signals in these two models are caused by a combination of forcing and the internal variability. After investigating the AMOC changes in the interglacials, we further explored the impact of AMOC on the climate system, especially on the changes in the simulated surface temperature and precipitation. After identifying the AMOC's fingerprint on the surface temperature and rainfall, we demonstrate ... |
format |
Article in Journal/Newspaper |
author |
Z. Jiang C. Brierley D. Thornalley S. Sax |
author_facet |
Z. Jiang C. Brierley D. Thornalley S. Sax |
author_sort |
Z. Jiang |
title |
No changes in overall AMOC strength in interglacial PMIP4 time slices |
title_short |
No changes in overall AMOC strength in interglacial PMIP4 time slices |
title_full |
No changes in overall AMOC strength in interglacial PMIP4 time slices |
title_fullStr |
No changes in overall AMOC strength in interglacial PMIP4 time slices |
title_full_unstemmed |
No changes in overall AMOC strength in interglacial PMIP4 time slices |
title_sort |
no changes in overall amoc strength in interglacial pmip4 time slices |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/cp-19-107-2023 https://cp.copernicus.org/articles/19/107/2023/cp-19-107-2023.pdf https://doaj.org/article/cd3adfd4a43544ec9ac07ef486a654a5 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Climate of the Past, Vol 19, Pp 107-121 (2023) |
op_relation |
doi:10.5194/cp-19-107-2023 1814-9324 1814-9332 https://cp.copernicus.org/articles/19/107/2023/cp-19-107-2023.pdf https://doaj.org/article/cd3adfd4a43544ec9ac07ef486a654a5 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-19-107-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
1 |
container_start_page |
107 |
op_container_end_page |
121 |
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