Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM
Changes of the Atlantic meridional overturning circulation (AMOC) in the mid-Holocene compared to the preindustrial state are explored in different coupled climate models. Using time-slice integrations by a newly developed global finite-element model ECHAM6-FESOM with unstructured mesh and high reso...
Published in: | Journal of Geophysical Research: Oceans |
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ftawi:oai:epic.awi.de:42755 2024-09-09T19:23:54+00:00 Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM Shi, Xiaoxu Lohmann, Gerrit 2016 application/pdf https://epic.awi.de/id/eprint/42755/ https://epic.awi.de/id/eprint/42755/1/Shi_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1002/2015JC011584 https://hdl.handle.net/10013/epic.49372 https://hdl.handle.net/10013/epic.49372.d001 unknown https://epic.awi.de/id/eprint/42755/1/Shi_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf https://hdl.handle.net/10013/epic.49372.d001 Shi, X. orcid:0000-0001-7793-9639 and Lohmann, G. orcid:0000-0003-2089-733X (2016) Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM , Journal of Geophysical Research: Oceans, 121 (8), pp. 6444-6469 . doi:10.1002/2015JC011584 <https://doi.org/10.1002/2015JC011584> , hdl:10013/epic.49372 EPIC3Journal of Geophysical Research: Oceans, 121(8), pp. 6444-6469, ISSN: 2169-9275 Article isiRev 2016 ftawi https://doi.org/10.1002/2015JC011584 2024-06-24T04:16:35Z Changes of the Atlantic meridional overturning circulation (AMOC) in the mid-Holocene compared to the preindustrial state are explored in different coupled climate models. Using time-slice integrations by a newly developed global finite-element model ECHAM6-FESOM with unstructured mesh and high resolution, our simulations show an enhanced mid-Holocene AMOC, accompanied by an increase in the ocean salinity over regions of deep water formation. We identify two different processes affecting the AMOC: (1) a more positive phase of North Atlantic Oscillation (NAO) increased water density over the Labrador Sea through anomalous net evaporation and surface heat loss; (2) a decreased import of sea ice from the Arctic causes a freshwater reduction in the northern North Atlantic Ocean. Using the coupled model ECHAM6-MPIOM in T63GR15 and T31GR30 grids, we find that the simulated AMOC has significant discrepancy with different model resolutions. In detail, stronger-than-present mid-Holocene AMOC is revealed by simulations with the T63GR15 grid, which resembles the result of ECHAM6-FESOM, while a decline of the mid-Holocene AMOC is simulated by the low resolution model with the T31GR30 grid. Such discrepancy can be attributed to different changes in Labrador Sea density which is mainly affected by (1) NAO-induced net precipitation and deep water convection, (2) freshwater transport from the Arctic Ocean, and (3) the strength of AMOC itself. Finally, we analyzed available coupled climate models showing a diversity of responses of AMOC to mid-Holocene forcings, most of which reveal positive AMOC changes related to northern high latitudes salinification. Article in Journal/Newspaper Arctic Arctic Ocean Labrador Sea North Atlantic North Atlantic oscillation Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Journal of Geophysical Research: Oceans 121 8 6444 6469 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Changes of the Atlantic meridional overturning circulation (AMOC) in the mid-Holocene compared to the preindustrial state are explored in different coupled climate models. Using time-slice integrations by a newly developed global finite-element model ECHAM6-FESOM with unstructured mesh and high resolution, our simulations show an enhanced mid-Holocene AMOC, accompanied by an increase in the ocean salinity over regions of deep water formation. We identify two different processes affecting the AMOC: (1) a more positive phase of North Atlantic Oscillation (NAO) increased water density over the Labrador Sea through anomalous net evaporation and surface heat loss; (2) a decreased import of sea ice from the Arctic causes a freshwater reduction in the northern North Atlantic Ocean. Using the coupled model ECHAM6-MPIOM in T63GR15 and T31GR30 grids, we find that the simulated AMOC has significant discrepancy with different model resolutions. In detail, stronger-than-present mid-Holocene AMOC is revealed by simulations with the T63GR15 grid, which resembles the result of ECHAM6-FESOM, while a decline of the mid-Holocene AMOC is simulated by the low resolution model with the T31GR30 grid. Such discrepancy can be attributed to different changes in Labrador Sea density which is mainly affected by (1) NAO-induced net precipitation and deep water convection, (2) freshwater transport from the Arctic Ocean, and (3) the strength of AMOC itself. Finally, we analyzed available coupled climate models showing a diversity of responses of AMOC to mid-Holocene forcings, most of which reveal positive AMOC changes related to northern high latitudes salinification. |
format |
Article in Journal/Newspaper |
author |
Shi, Xiaoxu Lohmann, Gerrit |
spellingShingle |
Shi, Xiaoxu Lohmann, Gerrit Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
author_facet |
Shi, Xiaoxu Lohmann, Gerrit |
author_sort |
Shi, Xiaoxu |
title |
Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
title_short |
Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
title_full |
Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
title_fullStr |
Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
title_full_unstemmed |
Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM |
title_sort |
simulated response of the mid-holocene atlantic meridional overturning circulation in echam6-fesom/mpiom |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42755/ https://epic.awi.de/id/eprint/42755/1/Shi_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf https://doi.org/10.1002/2015JC011584 https://hdl.handle.net/10013/epic.49372 https://hdl.handle.net/10013/epic.49372.d001 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Labrador Sea North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Arctic Arctic Ocean Labrador Sea North Atlantic North Atlantic oscillation Sea ice |
op_source |
EPIC3Journal of Geophysical Research: Oceans, 121(8), pp. 6444-6469, ISSN: 2169-9275 |
op_relation |
https://epic.awi.de/id/eprint/42755/1/Shi_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf https://hdl.handle.net/10013/epic.49372.d001 Shi, X. orcid:0000-0001-7793-9639 and Lohmann, G. orcid:0000-0003-2089-733X (2016) Simulated response of the mid-Holocene Atlantic meridional overturning circulation in ECHAM6-FESOM/MPIOM , Journal of Geophysical Research: Oceans, 121 (8), pp. 6444-6469 . doi:10.1002/2015JC011584 <https://doi.org/10.1002/2015JC011584> , hdl:10013/epic.49372 |
op_doi |
https://doi.org/10.1002/2015JC011584 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
121 |
container_issue |
8 |
container_start_page |
6444 |
op_container_end_page |
6469 |
_version_ |
1809893871471034368 |