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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ftpubman:oai:pure.mpg.de:item_3188644 2023-08-27T04:10:53+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. 2020-04-29 application/pdf http://hdl.handle.net/21.11116/0000-0006-698E-5 http://hdl.handle.net/21.11116/0000-0006-F308-F http://hdl.handle.net/21.11116/0000-0006-F309-E eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL087259 http://hdl.handle.net/21.11116/0000-0006-698E-5 http://hdl.handle.net/21.11116/0000-0006-F308-F http://hdl.handle.net/21.11116/0000-0006-F309-E info:eu-repo/semantics/openAccess Geophysical Research Letters info:eu-repo/semantics/article 2020 ftpubman https://doi.org/10.1029/2020GL087259 2023-08-02T01:20:26Z 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 Max Planck Society: MPG.PuRe Geophysical Research Letters 47 10 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
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. |
spellingShingle |
Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. Linking ocean forcing and atmospheric interactions to Atlantic multidecadal variability in MPI-ESM1.2 |
author_facet |
Oelsmann, J. Borchert, L. Hand, R. Baehr, J. Jungclaus, J. |
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 |
http://hdl.handle.net/21.11116/0000-0006-698E-5 http://hdl.handle.net/21.11116/0000-0006-F308-F http://hdl.handle.net/21.11116/0000-0006-F309-E |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_source |
Geophysical Research Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GL087259 http://hdl.handle.net/21.11116/0000-0006-698E-5 http://hdl.handle.net/21.11116/0000-0006-F308-F http://hdl.handle.net/21.11116/0000-0006-F309-E |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020GL087259 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
10 |
_version_ |
1775353265011032064 |