Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation
Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 Sverdrup (1 Sv = 106 m3 s-1) and time scales of 40–70 years. The model is reprodu...
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ftunivbergen:oai:bora.uib.no:1956/6537 2023-05-15T16:29:47+02:00 Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation Medhaug, Iselin Langehaug, Helene Reinertsen Eldevik, Tor Furevik, Tore Bentsen, Mats 2011-06-25 application/pdf https://hdl.handle.net/1956/6537 https://doi.org/10.1007/s00382-011-1124-z eng eng Springer Verlag urn:issn:0930-7575 https://hdl.handle.net/1956/6537 https://doi.org/10.1007/s00382-011-1124-z cristin:825921 Attribution CC BY http://creativecommons.org/licenses/by/2.0/ Copyright the authors Climate Dynamics 39 1-2 77-93 Atlantic Meridional Overturning Circulation Deep water formation Water mass transformation Peer reviewed Journal article 2011 ftunivbergen https://doi.org/10.1007/s00382-011-1124-z 2023-03-14T17:42:32Z Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 Sverdrup (1 Sv = 106 m3 s-1) and time scales of 40–70 years. The model is reproducing the observed dense water formation regions and has very realistic ocean transports and water mass distributions. The dense water produced in the Labrador Sea (1/3) and in the Nordic Seas, including the water entrained into the dense overflows across the Greenland-Scotland Ridge (GSR; 2/3), are the sources of North Atlantic Deep Water (NADW) forming the lower limb of the AMOC’s northern overturning. The variability in the Labrador Sea and the Nordic Seas convection is driven by decadal scale air-sea fluxes in the convective region that can be related to opposite phases of the North Atlantic Oscillation. The Labrador Sea convection is directly linked to the variability in AMOC. Linkages between convection and water mass transformation in the Nordic Seas are more indirect. The Scandinavian Pattern, the third mode of atmospheric variability in the North Atlantic, is a driver of the ocean’s poleward heat transport (PHT), the overall constraint on northern water mass transformation. Increased PHT is both associated with an increased water mass exchange across the GSR, and a stronger AMOC. publishedVersion Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North Atlantic oscillation University of Bergen: Bergen Open Research Archive (BORA-UiB) Bergen Greenland Climate Dynamics 39 1-2 77 93 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Atlantic Meridional Overturning Circulation Deep water formation Water mass transformation |
spellingShingle |
Atlantic Meridional Overturning Circulation Deep water formation Water mass transformation Medhaug, Iselin Langehaug, Helene Reinertsen Eldevik, Tor Furevik, Tore Bentsen, Mats Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
topic_facet |
Atlantic Meridional Overturning Circulation Deep water formation Water mass transformation |
description |
Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 Sverdrup (1 Sv = 106 m3 s-1) and time scales of 40–70 years. The model is reproducing the observed dense water formation regions and has very realistic ocean transports and water mass distributions. The dense water produced in the Labrador Sea (1/3) and in the Nordic Seas, including the water entrained into the dense overflows across the Greenland-Scotland Ridge (GSR; 2/3), are the sources of North Atlantic Deep Water (NADW) forming the lower limb of the AMOC’s northern overturning. The variability in the Labrador Sea and the Nordic Seas convection is driven by decadal scale air-sea fluxes in the convective region that can be related to opposite phases of the North Atlantic Oscillation. The Labrador Sea convection is directly linked to the variability in AMOC. Linkages between convection and water mass transformation in the Nordic Seas are more indirect. The Scandinavian Pattern, the third mode of atmospheric variability in the North Atlantic, is a driver of the ocean’s poleward heat transport (PHT), the overall constraint on northern water mass transformation. Increased PHT is both associated with an increased water mass exchange across the GSR, and a stronger AMOC. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Medhaug, Iselin Langehaug, Helene Reinertsen Eldevik, Tor Furevik, Tore Bentsen, Mats |
author_facet |
Medhaug, Iselin Langehaug, Helene Reinertsen Eldevik, Tor Furevik, Tore Bentsen, Mats |
author_sort |
Medhaug, Iselin |
title |
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
title_short |
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
title_full |
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
title_fullStr |
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
title_full_unstemmed |
Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation |
title_sort |
mechanisms for decadal scale variability in a simulated atlantic meridional overturning circulation |
publisher |
Springer Verlag |
publishDate |
2011 |
url |
https://hdl.handle.net/1956/6537 https://doi.org/10.1007/s00382-011-1124-z |
geographic |
Bergen Greenland |
geographic_facet |
Bergen Greenland |
genre |
Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North Atlantic oscillation |
op_source |
Climate Dynamics 39 1-2 77-93 |
op_relation |
urn:issn:0930-7575 https://hdl.handle.net/1956/6537 https://doi.org/10.1007/s00382-011-1124-z cristin:825921 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/2.0/ Copyright the authors |
op_doi |
https://doi.org/10.1007/s00382-011-1124-z |
container_title |
Climate Dynamics |
container_volume |
39 |
container_issue |
1-2 |
container_start_page |
77 |
op_container_end_page |
93 |
_version_ |
1766019495353122816 |