Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model
An ocean mixed layer heat budget methodology is used to investigate the physical processes determining subpolar North Atlantic (SPNA) sea surface temperature (SST) and ocean heat content (OHC) variability on decadal-multidecadal timescales using the state-of-the-art climate model HadGEM3-GC2. New el...
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American Meteorological Society
2019
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Online Access: | https://archimer.ifremer.fr/doc/00502/61395/65060.pdf https://doi.org/10.1175/JCLI-D-18-0709.1 https://archimer.ifremer.fr/doc/00502/61395/ |
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ftarchimer:oai:archimer.ifremer.fr:61395 2023-05-15T17:31:20+02:00 Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model Moat, B. I. Sinha, B. Josey, S. A. Robson, J. Ortega, P. Sévellec, Florian Holliday, N. P. Mccarthy, G. D. New, A. L. Hirschi, J. J.-m. 2019-09 application/pdf https://archimer.ifremer.fr/doc/00502/61395/65060.pdf https://doi.org/10.1175/JCLI-D-18-0709.1 https://archimer.ifremer.fr/doc/00502/61395/ eng eng American Meteorological Society info:eu-repo/grantAgreement/EC/H2020/727852/EU//Blue-Action https://archimer.ifremer.fr/doc/00502/61395/65060.pdf doi:10.1175/JCLI-D-18-0709.1 https://archimer.ifremer.fr/doc/00502/61395/ info:eu-repo/semantics/openAccess restricted use Journal Of Climate (0894-8755) (American Meteorological Society), 2019-09 , Vol. 32 , N. 18 , P. 6137-6161 Atmosphere-ocean interaction Climate variability Energy budget balance Fluxes Heat budgets Surface temperature text Publication info:eu-repo/semantics/article 2019 ftarchimer https://doi.org/10.1175/JCLI-D-18-0709.1 2021-09-23T20:32:57Z An ocean mixed layer heat budget methodology is used to investigate the physical processes determining subpolar North Atlantic (SPNA) sea surface temperature (SST) and ocean heat content (OHC) variability on decadal-multidecadal timescales using the state-of-the-art climate model HadGEM3-GC2. New elements include development of an equation for evolution of anomalous SST for interannual and longer timescales in a form analogous to that for OHC, parameterization of the diffusive heat flux at the base of the mixed layer and analysis of a composite AMOC event. Contributions to OHC and SST variability from two sources are evaluated i) net ocean-atmosphere heat flux and ii) all other processes, including advection, diffusion and entrainment for SST. Anomalies in OHC tendency propagate anticlockwise around the SPNA on multidecadal timescales with a clear relationship to the phase of the Atlantic meridional overturning circulation (AMOC). AMOC anomalies lead SST tendencies which in turn lead OHC tendencies in both the eastern and western SPNA. OHC and SST variations in the SPNA on decadal timescales are dominated by AMOC variability because it controls variability of advection which is shown to be the dominant term in the OHC budget. Lags between OHC and SST is traced to differences between the advection term for OHC and the advection-entrainment term for SST. The new results have implications for interpretation of variations in Atlantic heat uptake in the CMIP6 climate model assessment. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Journal of Climate 32 18 6137 6161 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
Atmosphere-ocean interaction Climate variability Energy budget balance Fluxes Heat budgets Surface temperature |
spellingShingle |
Atmosphere-ocean interaction Climate variability Energy budget balance Fluxes Heat budgets Surface temperature Moat, B. I. Sinha, B. Josey, S. A. Robson, J. Ortega, P. Sévellec, Florian Holliday, N. P. Mccarthy, G. D. New, A. L. Hirschi, J. J.-m. Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
topic_facet |
Atmosphere-ocean interaction Climate variability Energy budget balance Fluxes Heat budgets Surface temperature |
description |
An ocean mixed layer heat budget methodology is used to investigate the physical processes determining subpolar North Atlantic (SPNA) sea surface temperature (SST) and ocean heat content (OHC) variability on decadal-multidecadal timescales using the state-of-the-art climate model HadGEM3-GC2. New elements include development of an equation for evolution of anomalous SST for interannual and longer timescales in a form analogous to that for OHC, parameterization of the diffusive heat flux at the base of the mixed layer and analysis of a composite AMOC event. Contributions to OHC and SST variability from two sources are evaluated i) net ocean-atmosphere heat flux and ii) all other processes, including advection, diffusion and entrainment for SST. Anomalies in OHC tendency propagate anticlockwise around the SPNA on multidecadal timescales with a clear relationship to the phase of the Atlantic meridional overturning circulation (AMOC). AMOC anomalies lead SST tendencies which in turn lead OHC tendencies in both the eastern and western SPNA. OHC and SST variations in the SPNA on decadal timescales are dominated by AMOC variability because it controls variability of advection which is shown to be the dominant term in the OHC budget. Lags between OHC and SST is traced to differences between the advection term for OHC and the advection-entrainment term for SST. The new results have implications for interpretation of variations in Atlantic heat uptake in the CMIP6 climate model assessment. |
format |
Article in Journal/Newspaper |
author |
Moat, B. I. Sinha, B. Josey, S. A. Robson, J. Ortega, P. Sévellec, Florian Holliday, N. P. Mccarthy, G. D. New, A. L. Hirschi, J. J.-m. |
author_facet |
Moat, B. I. Sinha, B. Josey, S. A. Robson, J. Ortega, P. Sévellec, Florian Holliday, N. P. Mccarthy, G. D. New, A. L. Hirschi, J. J.-m. |
author_sort |
Moat, B. I. |
title |
Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
title_short |
Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
title_full |
Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
title_fullStr |
Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
title_full_unstemmed |
Insights into decadal North Atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
title_sort |
insights into decadal north atlantic sea surface temperature and ocean heat content variability from an eddy-permitting coupled climate model |
publisher |
American Meteorological Society |
publishDate |
2019 |
url |
https://archimer.ifremer.fr/doc/00502/61395/65060.pdf https://doi.org/10.1175/JCLI-D-18-0709.1 https://archimer.ifremer.fr/doc/00502/61395/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Journal Of Climate (0894-8755) (American Meteorological Society), 2019-09 , Vol. 32 , N. 18 , P. 6137-6161 |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/727852/EU//Blue-Action https://archimer.ifremer.fr/doc/00502/61395/65060.pdf doi:10.1175/JCLI-D-18-0709.1 https://archimer.ifremer.fr/doc/00502/61395/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1175/JCLI-D-18-0709.1 |
container_title |
Journal of Climate |
container_volume |
32 |
container_issue |
18 |
container_start_page |
6137 |
op_container_end_page |
6161 |
_version_ |
1766128835747643392 |