A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component
About 90% of the anthropogenic increase in heat stored in the climate system is found the oceans. Therefore it is relevant to understand the details of ocean heat uptake. Here we present a detailed, process-based analysis of ocean heat uptake (OHU) processes in HiGEM1.2, an atmosphere-ocean general...
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Online Access: | https://centaur.reading.ac.uk/39329/ https://centaur.reading.ac.uk/39329/1/Kuhlbrodt_Gregory_Shaffrey_2015.pdf |
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ftunivreading:oai:centaur.reading.ac.uk:39329 2024-05-19T07:31:27+00:00 A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component Kuhlbrodt, Till Gregory, Jonathan Shaffrey, Len 2015-12 text https://centaur.reading.ac.uk/39329/ https://centaur.reading.ac.uk/39329/1/Kuhlbrodt_Gregory_Shaffrey_2015.pdf en eng Springer https://centaur.reading.ac.uk/39329/1/Kuhlbrodt_Gregory_Shaffrey_2015.pdf Kuhlbrodt, T. <https://centaur.reading.ac.uk/view/creators/90000754.html> orcid:0000-0003-2328-6729 , Gregory, J. <https://centaur.reading.ac.uk/view/creators/90000874.html> and Shaffrey, L. <https://centaur.reading.ac.uk/view/creators/90000111.html> orcid:0000-0003-2696-752X (2015) A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component. Climate Dynamics, 45 (11). pp. 3205-3226. ISSN 1432-0894 doi: https://doi.org/10.1007/s00382-015-2534-0 <https://doi.org/10.1007/s00382-015-2534-0> Article PeerReviewed 2015 ftunivreading https://doi.org/10.1007/s00382-015-2534-0 2024-04-24T00:11:11Z About 90% of the anthropogenic increase in heat stored in the climate system is found the oceans. Therefore it is relevant to understand the details of ocean heat uptake. Here we present a detailed, process-based analysis of ocean heat uptake (OHU) processes in HiGEM1.2, an atmosphere-ocean general circulation model (AOGCM) with an eddy-permitting ocean component of 1/3 degree resolution. Similarly to various other models, HiGEM1.2 shows that the global heat budget is dominated by a downward advection of heat compensated by upward isopycnal diffusion. Only in the upper tropical ocean do we find the classical balance between downward diapycnal diffusion and upward advection of heat. The upward isopycnal diffusion of heat is located mostly in the Southern Ocean, which thus dominates the global heat budget. We compare the responses to a 4xCO2 forcing and an enhancement of the windstress forcing in the Southern Ocean. This highlights the importance of regional processes for the global ocean heat uptake. These are mainly surface fluxes and convection in the high latitudes, and advection in the Southern Ocean mid-latitudes. Changes in diffusion are less important. In line with the CMIP5 models, HiGEM1.2 shows a band of strong OHU in the mid-latitude Southern Ocean in the 4xCO2 run, which is mostly advective. By contrast, in the high-latitude Southern Ocean regions it is the suppression of convection that leads to OHU. In the enhanced windstress run, convection is strengthened at high Southern latitudes, leading to heat loss, while the magnitude of the OHU in the Southern mid-latitudes is very similar to the 4xCO2 results. Remarkably, there is only very small global OHU in the enhanced windstress run. The wind stress forcing just leads to a redistribution of heat. We relate the ocean changes at high southern latitudes to the effect of climate change on the Antarctic Circumpolar Current (ACC). It weakens in the 4xCO2 run and strengthens in the wind stress run. The weakening is due to a narrowing of the ACC, caused by an ... Article in Journal/Newspaper Antarc* Antarctic Southern Ocean CentAUR: Central Archive at the University of Reading Climate Dynamics 45 11-12 3205 3226 |
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Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
About 90% of the anthropogenic increase in heat stored in the climate system is found the oceans. Therefore it is relevant to understand the details of ocean heat uptake. Here we present a detailed, process-based analysis of ocean heat uptake (OHU) processes in HiGEM1.2, an atmosphere-ocean general circulation model (AOGCM) with an eddy-permitting ocean component of 1/3 degree resolution. Similarly to various other models, HiGEM1.2 shows that the global heat budget is dominated by a downward advection of heat compensated by upward isopycnal diffusion. Only in the upper tropical ocean do we find the classical balance between downward diapycnal diffusion and upward advection of heat. The upward isopycnal diffusion of heat is located mostly in the Southern Ocean, which thus dominates the global heat budget. We compare the responses to a 4xCO2 forcing and an enhancement of the windstress forcing in the Southern Ocean. This highlights the importance of regional processes for the global ocean heat uptake. These are mainly surface fluxes and convection in the high latitudes, and advection in the Southern Ocean mid-latitudes. Changes in diffusion are less important. In line with the CMIP5 models, HiGEM1.2 shows a band of strong OHU in the mid-latitude Southern Ocean in the 4xCO2 run, which is mostly advective. By contrast, in the high-latitude Southern Ocean regions it is the suppression of convection that leads to OHU. In the enhanced windstress run, convection is strengthened at high Southern latitudes, leading to heat loss, while the magnitude of the OHU in the Southern mid-latitudes is very similar to the 4xCO2 results. Remarkably, there is only very small global OHU in the enhanced windstress run. The wind stress forcing just leads to a redistribution of heat. We relate the ocean changes at high southern latitudes to the effect of climate change on the Antarctic Circumpolar Current (ACC). It weakens in the 4xCO2 run and strengthens in the wind stress run. The weakening is due to a narrowing of the ACC, caused by an ... |
format |
Article in Journal/Newspaper |
author |
Kuhlbrodt, Till Gregory, Jonathan Shaffrey, Len |
spellingShingle |
Kuhlbrodt, Till Gregory, Jonathan Shaffrey, Len A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
author_facet |
Kuhlbrodt, Till Gregory, Jonathan Shaffrey, Len |
author_sort |
Kuhlbrodt, Till |
title |
A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
title_short |
A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
title_full |
A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
title_fullStr |
A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
title_full_unstemmed |
A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component |
title_sort |
process-based analysis of ocean heat uptake in an aogcm with an eddy-permitting ocean component |
publisher |
Springer |
publishDate |
2015 |
url |
https://centaur.reading.ac.uk/39329/ https://centaur.reading.ac.uk/39329/1/Kuhlbrodt_Gregory_Shaffrey_2015.pdf |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://centaur.reading.ac.uk/39329/1/Kuhlbrodt_Gregory_Shaffrey_2015.pdf Kuhlbrodt, T. <https://centaur.reading.ac.uk/view/creators/90000754.html> orcid:0000-0003-2328-6729 , Gregory, J. <https://centaur.reading.ac.uk/view/creators/90000874.html> and Shaffrey, L. <https://centaur.reading.ac.uk/view/creators/90000111.html> orcid:0000-0003-2696-752X (2015) A process-based analysis of ocean heat uptake in an AOGCM with an eddy-permitting ocean component. Climate Dynamics, 45 (11). pp. 3205-3226. ISSN 1432-0894 doi: https://doi.org/10.1007/s00382-015-2534-0 <https://doi.org/10.1007/s00382-015-2534-0> |
op_doi |
https://doi.org/10.1007/s00382-015-2534-0 |
container_title |
Climate Dynamics |
container_volume |
45 |
container_issue |
11-12 |
container_start_page |
3205 |
op_container_end_page |
3226 |
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1799469311540068352 |