High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity
Centennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the absence of external forcing has been identified in several climate models, but proposed mechanisms differ considerably. Therefore, better understanding of processes governing AMOC variability at these times...
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Online Access: | https://hdl.handle.net/11583/2976677 https://doi.org/10.1007/s00382-022-06640-3 https://link.springer.com/article/10.1007/s00382-022-06640-3 |
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ftpoltorinoiris:oai:iris.polito.it:11583/2976677 2024-09-15T17:53:26+00:00 High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost 2023 https://hdl.handle.net/11583/2976677 https://doi.org/10.1007/s00382-022-06640-3 https://link.springer.com/article/10.1007/s00382-022-06640-3 eng eng SPRINGER info:eu-repo/semantics/altIdentifier/wos/WOS:000905451400001 numberofpages:16 journal:CLIMATE DYNAMICS https://hdl.handle.net/11583/2976677 doi:10.1007/s00382-022-06640-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85145104881 https://link.springer.com/article/10.1007/s00382-022-06640-3 info:eu-repo/semantics/openAccess AMOC Centennial climate variability Climate model EMIC North Atlantic Arctic Ocean info:eu-repo/semantics/article 2023 ftpoltorinoiris https://doi.org/10.1007/s00382-022-06640-3 2024-08-11T23:34:59Z Centennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the absence of external forcing has been identified in several climate models, but proposed mechanisms differ considerably. Therefore, better understanding of processes governing AMOC variability at these timescales is needed. Here, we analyze numerical simulations with PlaSim-LSG, an Earth System Model Intermediate Complexity (EMIC), which exhibits strong multicentennial oscillations of AMOC strength under constant pre-industrial boundary conditions. We identify a novel mechanism in which these oscillations are driven by salinity anomalies from the Arctic Ocean, which can be attributed to changes in high-latitude precipitation. We further corroborate our findings by conducting a set of millennial-length sensitivity experiments, and we interpret the mechanism by formulating a three-box model which qualitatively reproduces regular oscillations of the AMOC. While PlaSim-LSG lacks complexity compared to state-of-the-art models, our results reveal that precipitation minus evaporation (P-E) change in the Arctic is a physically plausible driver of centennial-scale AMOC variability. We discuss how this mechanism might be most relevant in climate states warmer than the present-day, raising questions about the state-dependence of multicentennial AMOC variability. Article in Journal/Newspaper Arctic Ocean Atlantic Arctic Atlantic-Arctic North Atlantic PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino) Climate Dynamics |
institution |
Open Polar |
collection |
PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino) |
op_collection_id |
ftpoltorinoiris |
language |
English |
topic |
AMOC Centennial climate variability Climate model EMIC North Atlantic Arctic Ocean |
spellingShingle |
AMOC Centennial climate variability Climate model EMIC North Atlantic Arctic Ocean Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
topic_facet |
AMOC Centennial climate variability Climate model EMIC North Atlantic Arctic Ocean |
description |
Centennial-scale variability of the Atlantic Meridional Overturning Circulation (AMOC) in the absence of external forcing has been identified in several climate models, but proposed mechanisms differ considerably. Therefore, better understanding of processes governing AMOC variability at these timescales is needed. Here, we analyze numerical simulations with PlaSim-LSG, an Earth System Model Intermediate Complexity (EMIC), which exhibits strong multicentennial oscillations of AMOC strength under constant pre-industrial boundary conditions. We identify a novel mechanism in which these oscillations are driven by salinity anomalies from the Arctic Ocean, which can be attributed to changes in high-latitude precipitation. We further corroborate our findings by conducting a set of millennial-length sensitivity experiments, and we interpret the mechanism by formulating a three-box model which qualitatively reproduces regular oscillations of the AMOC. While PlaSim-LSG lacks complexity compared to state-of-the-art models, our results reveal that precipitation minus evaporation (P-E) change in the Arctic is a physically plausible driver of centennial-scale AMOC variability. We discuss how this mechanism might be most relevant in climate states warmer than the present-day, raising questions about the state-dependence of multicentennial AMOC variability. |
author2 |
Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost |
format |
Article in Journal/Newspaper |
author |
Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost |
author_facet |
Mehling, Oliver Bellomo, Katinka Angeloni, Michela Pasquero, Claudia von Hardenberg, Jost |
author_sort |
Mehling, Oliver |
title |
High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
title_short |
High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
title_full |
High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
title_fullStr |
High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
title_full_unstemmed |
High-latitude precipitation as a driver of multicentennial variability of the AMOC in a climate model of intermediate complexity |
title_sort |
high-latitude precipitation as a driver of multicentennial variability of the amoc in a climate model of intermediate complexity |
publisher |
SPRINGER |
publishDate |
2023 |
url |
https://hdl.handle.net/11583/2976677 https://doi.org/10.1007/s00382-022-06640-3 https://link.springer.com/article/10.1007/s00382-022-06640-3 |
genre |
Arctic Ocean Atlantic Arctic Atlantic-Arctic North Atlantic |
genre_facet |
Arctic Ocean Atlantic Arctic Atlantic-Arctic North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000905451400001 numberofpages:16 journal:CLIMATE DYNAMICS https://hdl.handle.net/11583/2976677 doi:10.1007/s00382-022-06640-3 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85145104881 https://link.springer.com/article/10.1007/s00382-022-06640-3 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00382-022-06640-3 |
container_title |
Climate Dynamics |
_version_ |
1810295540927168512 |