Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium
The Atlantic multidecadal variability (AMV) modulates the North Atlantic surface ocean variability and affects decadal climates over the globe; its underlying mechanisms remain, however, under debate. In this study, we use a multi-model ensemble of transient past-millennium (850-1849) and unperturbe...
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ftird:oai:ird.fr:fdi:010083850 2024-09-15T18:23:18+00:00 Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium Fang, S. W. /Khodri, Myriam Timmreck, C. Zanchettin, D. Jungclaus, J. ATLANTIQUE 2021 https://www.documentation.ird.fr/hor/fdi:010083850 EN eng https://www.documentation.ird.fr/hor/fdi:010083850 oai:ird.fr:fdi:010083850 Fang S. W., Khodri Myriam, Timmreck C., Zanchettin D., Jungclaus J. Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium. 2021, 48 (23), e2021GL095990 [10 p.] Atlantic multidecadal variability PMIP4 past1000 paleo-climate internal variability volcano text 2021 ftird 2024-08-15T05:57:40Z The Atlantic multidecadal variability (AMV) modulates the North Atlantic surface ocean variability and affects decadal climates over the globe; its underlying mechanisms remain, however, under debate. In this study, we use a multi-model ensemble of transient past-millennium (850-1849) and unperturbed preindustrial control simulations contributing to the paleoclimate modeling intercomparison project-phase 4 (PMIP4) to decompose the AMV signal into the internal AMV and the external signal. The internal component of AMV exhibits no robust behavior across simulations during periods of major forcing such as strong volcanic eruptions, whereas the external forced temperature responds to volcanic eruptions with an immediate radiative cooling followed, in some simulations, by a sequence of damped multidecadal oscillations. The internal component tightly relates with the Atlantic meridional overturning circulation (AMOC) and dominates the fluctuations of AMV; whereas the external signal has limited impacts on AMOC and explains similar to 25% of the AMV variance over the past millennium. Text North Atlantic IRD (Institute de recherche pour le développement): Horizon |
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Open Polar |
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IRD (Institute de recherche pour le développement): Horizon |
op_collection_id |
ftird |
language |
English |
topic |
Atlantic multidecadal variability PMIP4 past1000 paleo-climate internal variability volcano |
spellingShingle |
Atlantic multidecadal variability PMIP4 past1000 paleo-climate internal variability volcano Fang, S. W. /Khodri, Myriam Timmreck, C. Zanchettin, D. Jungclaus, J. Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
topic_facet |
Atlantic multidecadal variability PMIP4 past1000 paleo-climate internal variability volcano |
description |
The Atlantic multidecadal variability (AMV) modulates the North Atlantic surface ocean variability and affects decadal climates over the globe; its underlying mechanisms remain, however, under debate. In this study, we use a multi-model ensemble of transient past-millennium (850-1849) and unperturbed preindustrial control simulations contributing to the paleoclimate modeling intercomparison project-phase 4 (PMIP4) to decompose the AMV signal into the internal AMV and the external signal. The internal component of AMV exhibits no robust behavior across simulations during periods of major forcing such as strong volcanic eruptions, whereas the external forced temperature responds to volcanic eruptions with an immediate radiative cooling followed, in some simulations, by a sequence of damped multidecadal oscillations. The internal component tightly relates with the Atlantic meridional overturning circulation (AMOC) and dominates the fluctuations of AMV; whereas the external signal has limited impacts on AMOC and explains similar to 25% of the AMV variance over the past millennium. |
format |
Text |
author |
Fang, S. W. /Khodri, Myriam Timmreck, C. Zanchettin, D. Jungclaus, J. |
author_facet |
Fang, S. W. /Khodri, Myriam Timmreck, C. Zanchettin, D. Jungclaus, J. |
author_sort |
Fang, S. W. |
title |
Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
title_short |
Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
title_full |
Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
title_fullStr |
Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
title_full_unstemmed |
Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium |
title_sort |
disentangling internal and external contributions to atlantic multidecadal variability over the past millennium |
publishDate |
2021 |
url |
https://www.documentation.ird.fr/hor/fdi:010083850 |
op_coverage |
ATLANTIQUE |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://www.documentation.ird.fr/hor/fdi:010083850 oai:ird.fr:fdi:010083850 Fang S. W., Khodri Myriam, Timmreck C., Zanchettin D., Jungclaus J. Disentangling internal and external contributions to Atlantic multidecadal variability over the past millennium. 2021, 48 (23), e2021GL095990 [10 p.] |
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1810463487868010496 |