Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2
We investigate how ocean-driven multidecadal sea surface temperature (SST) variations force the atmosphere to jointly set the pace of Atlantic multidecadal variability (AMV). We generate periodic low-frequency Atlantic Meridional Overturning Circulation oscillations by implementing time-dependent de...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/9440 2023-05-15T17:33:23+02:00 Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. H. 2020 https://doi.org/10.1029/2020GL087259 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9440 eng eng doi:10.1029/2020GL087259 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9440 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. CC-BY ddc:551.6 Atlantic multidecadal variability Atlantic Meridional Overturning Circulation climate variability ocean-atmosphere interactions ocean dynamics causes of Atlantic multidecadal variability doc-type:article 2020 ftsubggeo https://doi.org/10.1029/2020GL087259 2022-11-09T06:51:40Z We investigate how ocean-driven multidecadal sea surface temperature (SST) variations force the atmosphere to jointly set the pace of Atlantic multidecadal variability (AMV). We generate periodic low-frequency Atlantic Meridional Overturning Circulation oscillations by implementing time-dependent deep-ocean-density restoring in MPI-ESM1.2 to explicitly identify variations driven by Atlantic Meridional Overturning Circulation without any perturbation at the ocean-atmosphere interface. We show in a coupled experiment that ocean heat convergence variations generate positive SST anomalies, turbulent heat release, and low sea level pressure in the subpolar North Atlantic (NA) and vice versa. The SST signal is communicated to the tropical NA by wind-evaporative-SST feedbacks and to the North-East Atlantic by enhanced northward atmospheric heat transport. Such atmospheric feedbacks and the characteristic AMV-SST pattern are synchronized to the multidecadal time scale of ocean circulation changes by air-sea heat exchange. This coupled ocean-atmosphere mechanism is consistent with observed features of AMV and thus supports a key role of ocean dynamics in driving the AMV. Article in Journal/Newspaper North Atlantic North East Atlantic GEO-LEOe-docs (FID GEO) Geophysical Research Letters 47 10 |
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Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:551.6 Atlantic multidecadal variability Atlantic Meridional Overturning Circulation climate variability ocean-atmosphere interactions ocean dynamics causes of Atlantic multidecadal variability |
spellingShingle |
ddc:551.6 Atlantic multidecadal variability Atlantic Meridional Overturning Circulation climate variability ocean-atmosphere interactions ocean dynamics causes of Atlantic multidecadal variability Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. H. Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
topic_facet |
ddc:551.6 Atlantic multidecadal variability Atlantic Meridional Overturning Circulation climate variability ocean-atmosphere interactions ocean dynamics causes of Atlantic multidecadal variability |
description |
We investigate how ocean-driven multidecadal sea surface temperature (SST) variations force the atmosphere to jointly set the pace of Atlantic multidecadal variability (AMV). We generate periodic low-frequency Atlantic Meridional Overturning Circulation oscillations by implementing time-dependent deep-ocean-density restoring in MPI-ESM1.2 to explicitly identify variations driven by Atlantic Meridional Overturning Circulation without any perturbation at the ocean-atmosphere interface. We show in a coupled experiment that ocean heat convergence variations generate positive SST anomalies, turbulent heat release, and low sea level pressure in the subpolar North Atlantic (NA) and vice versa. The SST signal is communicated to the tropical NA by wind-evaporative-SST feedbacks and to the North-East Atlantic by enhanced northward atmospheric heat transport. Such atmospheric feedbacks and the characteristic AMV-SST pattern are synchronized to the multidecadal time scale of ocean circulation changes by air-sea heat exchange. This coupled ocean-atmosphere mechanism is consistent with observed features of AMV and thus supports a key role of ocean dynamics in driving the AMV. |
format |
Article in Journal/Newspaper |
author |
Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. H. |
author_facet |
Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. H. |
author_sort |
Oelsmann, J. |
title |
Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
title_short |
Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
title_full |
Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
title_fullStr |
Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
title_full_unstemmed |
Linking Ocean Forcing and Atmospheric Interactions to Atlantic Multidecadal Variability in MPI-ESM1.2 |
title_sort |
linking ocean forcing and atmospheric interactions to atlantic multidecadal variability in mpi-esm1.2 |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020GL087259 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9440 |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_relation |
doi:10.1029/2020GL087259 http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9440 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020GL087259 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
10 |
_version_ |
1766131869382868992 |