The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate
Multiple palaeo-proxy and modelling studies suggest that Mediterranean Outflow Water (MOW) is an important driver of Atlantic Meridional Overturning Circulation (AMOC), particularly during periods of weak overturning. Here, we employ the HadCM3 ocean–atmosphere General Circulation Model (GCM) to inv...
Published in: | Ocean Modelling |
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2013
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Online Access: | https://hdl.handle.net/1983/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://research-information.bris.ac.uk/en/publications/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://doi.org/10.1016/j.ocemod.2012.11.002 |
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ftubristolcris:oai:research-information.bris.ac.uk:publications/5028fc82-de5a-4b14-9060-4bf04d8338d5 2024-01-28T10:07:38+01:00 The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate Ivanovic, Ruza F Valdes, Paul J Flecker, Rachel M Gregoire, Lauren J Gutjahr, Marcus 2013-02 https://hdl.handle.net/1983/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://research-information.bris.ac.uk/en/publications/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://doi.org/10.1016/j.ocemod.2012.11.002 eng eng info:eu-repo/semantics/restrictedAccess Ivanovic , R F , Valdes , P J , Flecker , R M , Gregoire , L J & Gutjahr , M 2013 , ' The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate ' , Ocean Modelling , vol. 62 , pp. 11-16 . https://doi.org/10.1016/j.ocemod.2012.11.002 article 2013 ftubristolcris https://doi.org/10.1016/j.ocemod.2012.11.002 2024-01-04T23:37:05Z Multiple palaeo-proxy and modelling studies suggest that Mediterranean Outflow Water (MOW) is an important driver of Atlantic Meridional Overturning Circulation (AMOC), particularly during periods of weak overturning. Here, we employ the HadCM3 ocean–atmosphere General Circulation Model (GCM) to investigate the effect of using different parameterisations of Mediterranean–Atlantic water exchange on global ocean circulation and climate. In HadCM3, simulating flow through the Gibraltar Straits with an ‘open seaway’ rather than a ‘diffusive pipe’ causes a shoaling and strengthening of the MOW plume. This reorganises shallow Atlantic circulation, producing regional surface air temperature anomalies of up to + 11 °C and −7.5 °C. We conclude that when investigating the influence of MOW on modelled ocean circulation and climate, an accurate parameterisation of Mediterranean–Atlantic exchange is important and should match observed fresh water and salinity flux constraints. This probably cannot be achieved through a simple ‘diffusive pipe’ with depth invariant mixing coefficient. Article in Journal/Newspaper North Atlantic University of Bristol: Bristol Research Ocean Modelling 62 11 16 |
institution |
Open Polar |
collection |
University of Bristol: Bristol Research |
op_collection_id |
ftubristolcris |
language |
English |
description |
Multiple palaeo-proxy and modelling studies suggest that Mediterranean Outflow Water (MOW) is an important driver of Atlantic Meridional Overturning Circulation (AMOC), particularly during periods of weak overturning. Here, we employ the HadCM3 ocean–atmosphere General Circulation Model (GCM) to investigate the effect of using different parameterisations of Mediterranean–Atlantic water exchange on global ocean circulation and climate. In HadCM3, simulating flow through the Gibraltar Straits with an ‘open seaway’ rather than a ‘diffusive pipe’ causes a shoaling and strengthening of the MOW plume. This reorganises shallow Atlantic circulation, producing regional surface air temperature anomalies of up to + 11 °C and −7.5 °C. We conclude that when investigating the influence of MOW on modelled ocean circulation and climate, an accurate parameterisation of Mediterranean–Atlantic exchange is important and should match observed fresh water and salinity flux constraints. This probably cannot be achieved through a simple ‘diffusive pipe’ with depth invariant mixing coefficient. |
format |
Article in Journal/Newspaper |
author |
Ivanovic, Ruza F Valdes, Paul J Flecker, Rachel M Gregoire, Lauren J Gutjahr, Marcus |
spellingShingle |
Ivanovic, Ruza F Valdes, Paul J Flecker, Rachel M Gregoire, Lauren J Gutjahr, Marcus The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
author_facet |
Ivanovic, Ruza F Valdes, Paul J Flecker, Rachel M Gregoire, Lauren J Gutjahr, Marcus |
author_sort |
Ivanovic, Ruza F |
title |
The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
title_short |
The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
title_full |
The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
title_fullStr |
The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
title_full_unstemmed |
The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate |
title_sort |
parameterisation of mediterranean-atlantic water exchange in the hadley centre model hadcm3, and its effect on modelled north atlantic climate |
publishDate |
2013 |
url |
https://hdl.handle.net/1983/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://research-information.bris.ac.uk/en/publications/5028fc82-de5a-4b14-9060-4bf04d8338d5 https://doi.org/10.1016/j.ocemod.2012.11.002 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Ivanovic , R F , Valdes , P J , Flecker , R M , Gregoire , L J & Gutjahr , M 2013 , ' The parameterisation of Mediterranean-Atlantic water exchange in the Hadley Centre model HadCM3, and its effect on modelled North Atlantic climate ' , Ocean Modelling , vol. 62 , pp. 11-16 . https://doi.org/10.1016/j.ocemod.2012.11.002 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.ocemod.2012.11.002 |
container_title |
Ocean Modelling |
container_volume |
62 |
container_start_page |
11 |
op_container_end_page |
16 |
_version_ |
1789335571957547008 |