Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System
Here, the authors observe an interdecadal oscillatory mode of the North Atlantic atmosphere–ocean system in a general circulation model (GFDL CM2.1) via a linear inverse model (LIM). The oscillation mechanism is mostly embedded in the subpolar gyre: anomalous advection generates density anomalies in...
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Online Access: | http://www.osti.gov/servlets/purl/1544388 https://www.osti.gov/biblio/1544388 https://doi.org/10.1175/JCLI-D-16-0751.1 |
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ftosti:oai:osti.gov:1544388 2023-07-30T04:04:43+02:00 Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System Zhao, Bowen Reichler, Thomas Strong, Courtenay Penland, Cecile 2019-10-14 application/pdf http://www.osti.gov/servlets/purl/1544388 https://www.osti.gov/biblio/1544388 https://doi.org/10.1175/JCLI-D-16-0751.1 unknown http://www.osti.gov/servlets/purl/1544388 https://www.osti.gov/biblio/1544388 https://doi.org/10.1175/JCLI-D-16-0751.1 doi:10.1175/JCLI-D-16-0751.1 54 ENVIRONMENTAL SCIENCES 2019 ftosti https://doi.org/10.1175/JCLI-D-16-0751.1 2023-07-11T09:35:16Z Here, the authors observe an interdecadal oscillatory mode of the North Atlantic atmosphere–ocean system in a general circulation model (GFDL CM2.1) via a linear inverse model (LIM). The oscillation mechanism is mostly embedded in the subpolar gyre: anomalous advection generates density anomalies in the eastern subpolar gyre, which propagate along the mean gyre circulation and reach the subpolar gyre center around 10 years later, when associated anomalous advection of the opposite sign starts the other half cycle. While density anomalies reach the Labrador Sea deep convection region, Atlantic meridional overturning circulation (AMOC) anomalies are also induced. Both the gyre and AMOC anomalies then propagate equatorward slowly, following the advection of density anomalies. The oscillation is further demonstrated to be more likely an ocean-only mode while excited by the atmospheric forcing; in particular, it can be approximated as a linearly driven damped oscillator that is partly excited by the North Atlantic Oscillation (NAO). The slowly evolving interdecadal oscillation significantly improves and prolongs the LIM’s prediction skill of sea surface temperature (SST) evolution. Other/Unknown Material Labrador Sea North Atlantic North Atlantic oscillation SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Journal of Climate 30 17 6737 6755 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
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54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Zhao, Bowen Reichler, Thomas Strong, Courtenay Penland, Cecile Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Here, the authors observe an interdecadal oscillatory mode of the North Atlantic atmosphere–ocean system in a general circulation model (GFDL CM2.1) via a linear inverse model (LIM). The oscillation mechanism is mostly embedded in the subpolar gyre: anomalous advection generates density anomalies in the eastern subpolar gyre, which propagate along the mean gyre circulation and reach the subpolar gyre center around 10 years later, when associated anomalous advection of the opposite sign starts the other half cycle. While density anomalies reach the Labrador Sea deep convection region, Atlantic meridional overturning circulation (AMOC) anomalies are also induced. Both the gyre and AMOC anomalies then propagate equatorward slowly, following the advection of density anomalies. The oscillation is further demonstrated to be more likely an ocean-only mode while excited by the atmospheric forcing; in particular, it can be approximated as a linearly driven damped oscillator that is partly excited by the North Atlantic Oscillation (NAO). The slowly evolving interdecadal oscillation significantly improves and prolongs the LIM’s prediction skill of sea surface temperature (SST) evolution. |
author |
Zhao, Bowen Reichler, Thomas Strong, Courtenay Penland, Cecile |
author_facet |
Zhao, Bowen Reichler, Thomas Strong, Courtenay Penland, Cecile |
author_sort |
Zhao, Bowen |
title |
Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
title_short |
Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
title_full |
Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
title_fullStr |
Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
title_full_unstemmed |
Simultaneous Evolution of Gyre and Atlantic Meridional Overturning Circulation Anomalies as an Eigenmode of the North Atlantic System |
title_sort |
simultaneous evolution of gyre and atlantic meridional overturning circulation anomalies as an eigenmode of the north atlantic system |
publishDate |
2019 |
url |
http://www.osti.gov/servlets/purl/1544388 https://www.osti.gov/biblio/1544388 https://doi.org/10.1175/JCLI-D-16-0751.1 |
genre |
Labrador Sea North Atlantic North Atlantic oscillation |
genre_facet |
Labrador Sea North Atlantic North Atlantic oscillation |
op_relation |
http://www.osti.gov/servlets/purl/1544388 https://www.osti.gov/biblio/1544388 https://doi.org/10.1175/JCLI-D-16-0751.1 doi:10.1175/JCLI-D-16-0751.1 |
op_doi |
https://doi.org/10.1175/JCLI-D-16-0751.1 |
container_title |
Journal of Climate |
container_volume |
30 |
container_issue |
17 |
container_start_page |
6737 |
op_container_end_page |
6755 |
_version_ |
1772816297130721280 |