Large diversity in AMOC internal variability across NEMO-based climate models
We characterise, and explore the drivers of, differences in the internal variability of the Atlantic Meridional Overturning Circulation (AMOC) across five NEMO-based CMIP6 class climate models. While the variability of AMOC variability is dominated by its lower dense limb in all models, there is lar...
Published in: | Climate Dynamics |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer
2024
|
Subjects: | |
Online Access: | https://centaur.reading.ac.uk/114411/ https://centaur.reading.ac.uk/114411/9/114411%20VoR.pdf https://centaur.reading.ac.uk/114411/1/Zhao_CLDY-D-23-00391R2_accepted.pdf |
id |
ftunivreading:oai:centaur.reading.ac.uk:114411 |
---|---|
record_format |
openpolar |
spelling |
ftunivreading:oai:centaur.reading.ac.uk:114411 2024-09-09T19:21:57+00:00 Large diversity in AMOC internal variability across NEMO-based climate models Zhao, Alcide Robson, Jon Sutton, Rowan Lai, Michael W. K. Mecking, Jennifer V. Yeager, Stephen Petit, Tillys 2024-05 text https://centaur.reading.ac.uk/114411/ https://centaur.reading.ac.uk/114411/9/114411%20VoR.pdf https://centaur.reading.ac.uk/114411/1/Zhao_CLDY-D-23-00391R2_accepted.pdf en eng Springer https://centaur.reading.ac.uk/114411/9/114411%20VoR.pdf https://centaur.reading.ac.uk/114411/1/Zhao_CLDY-D-23-00391R2_accepted.pdf Zhao, A. <https://centaur.reading.ac.uk/view/creators/90010635.html> orcid:0000-0002-8300-5872 , Robson, J. <https://centaur.reading.ac.uk/view/creators/90002607.html> orcid:0000-0002-3467-018X , Sutton, R. <https://centaur.reading.ac.uk/view/creators/90000057.html> orcid:0000-0001-8345-8583 , Lai, M. W. K., Mecking, J. V., Yeager, S. and Petit, T. <https://centaur.reading.ac.uk/view/creators/90010964.html> orcid:0000-0002-7922-9363 (2024) Large diversity in AMOC internal variability across NEMO-based climate models. Climate Dynamics, 62 (5). pp. 3355-3374. ISSN 1432-0894 doi: https://doi.org/10.1007/s00382-023-07069-y <https://doi.org/10.1007/s00382-023-07069-y> cc_by_4 Article PeerReviewed 2024 ftunivreading https://doi.org/10.1007/s00382-023-07069-y 2024-06-18T14:20:05Z We characterise, and explore the drivers of, differences in the internal variability of the Atlantic Meridional Overturning Circulation (AMOC) across five NEMO-based CMIP6 class climate models. While the variability of AMOC variability is dominated by its lower dense limb in all models, there is large diversity in the timescale, multidecadal variability, and latitudinal coherence of AMOC across models. In particular, the UK models have much weaker AMOC multidecadal variability and latitudinal coherence. The model diversity is associated with differences in salinity-governed surface density variations which drive high-density water mass transformation (WMT) in the Greenland-Iceland-Norwegian Seas (GIN) and the Arctic. Specifically, GIN Seas WMT shows large multidecadal variability which has a major impact on AMOC variability in non-UK models. In contrast, the smaller variability in GIN Seas WMT in the UK models has limited impact on the lower latitude AMOC via the Denmark strait overflow mass transportation. This leads to a latitudinally less coherent and weaker multidecadal variability of the AMOC lower limb. Such differences between UK and non-UK models are related to differences in model mean states and densification processes in the Arctic and GIN Seas. Consequently, we recommend further in-depth studies to better understand and constrain processes driving salinity changes in the Arctic and GIN Seas for more reliable representation of the AMOC in climate models. Article in Journal/Newspaper Arctic Denmark Strait Greenland Iceland CentAUR: Central Archive at the University of Reading Arctic Greenland Climate Dynamics 62 5 3355 3374 |
institution |
Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
We characterise, and explore the drivers of, differences in the internal variability of the Atlantic Meridional Overturning Circulation (AMOC) across five NEMO-based CMIP6 class climate models. While the variability of AMOC variability is dominated by its lower dense limb in all models, there is large diversity in the timescale, multidecadal variability, and latitudinal coherence of AMOC across models. In particular, the UK models have much weaker AMOC multidecadal variability and latitudinal coherence. The model diversity is associated with differences in salinity-governed surface density variations which drive high-density water mass transformation (WMT) in the Greenland-Iceland-Norwegian Seas (GIN) and the Arctic. Specifically, GIN Seas WMT shows large multidecadal variability which has a major impact on AMOC variability in non-UK models. In contrast, the smaller variability in GIN Seas WMT in the UK models has limited impact on the lower latitude AMOC via the Denmark strait overflow mass transportation. This leads to a latitudinally less coherent and weaker multidecadal variability of the AMOC lower limb. Such differences between UK and non-UK models are related to differences in model mean states and densification processes in the Arctic and GIN Seas. Consequently, we recommend further in-depth studies to better understand and constrain processes driving salinity changes in the Arctic and GIN Seas for more reliable representation of the AMOC in climate models. |
format |
Article in Journal/Newspaper |
author |
Zhao, Alcide Robson, Jon Sutton, Rowan Lai, Michael W. K. Mecking, Jennifer V. Yeager, Stephen Petit, Tillys |
spellingShingle |
Zhao, Alcide Robson, Jon Sutton, Rowan Lai, Michael W. K. Mecking, Jennifer V. Yeager, Stephen Petit, Tillys Large diversity in AMOC internal variability across NEMO-based climate models |
author_facet |
Zhao, Alcide Robson, Jon Sutton, Rowan Lai, Michael W. K. Mecking, Jennifer V. Yeager, Stephen Petit, Tillys |
author_sort |
Zhao, Alcide |
title |
Large diversity in AMOC internal variability across NEMO-based climate models |
title_short |
Large diversity in AMOC internal variability across NEMO-based climate models |
title_full |
Large diversity in AMOC internal variability across NEMO-based climate models |
title_fullStr |
Large diversity in AMOC internal variability across NEMO-based climate models |
title_full_unstemmed |
Large diversity in AMOC internal variability across NEMO-based climate models |
title_sort |
large diversity in amoc internal variability across nemo-based climate models |
publisher |
Springer |
publishDate |
2024 |
url |
https://centaur.reading.ac.uk/114411/ https://centaur.reading.ac.uk/114411/9/114411%20VoR.pdf https://centaur.reading.ac.uk/114411/1/Zhao_CLDY-D-23-00391R2_accepted.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Denmark Strait Greenland Iceland |
genre_facet |
Arctic Denmark Strait Greenland Iceland |
op_relation |
https://centaur.reading.ac.uk/114411/9/114411%20VoR.pdf https://centaur.reading.ac.uk/114411/1/Zhao_CLDY-D-23-00391R2_accepted.pdf Zhao, A. <https://centaur.reading.ac.uk/view/creators/90010635.html> orcid:0000-0002-8300-5872 , Robson, J. <https://centaur.reading.ac.uk/view/creators/90002607.html> orcid:0000-0002-3467-018X , Sutton, R. <https://centaur.reading.ac.uk/view/creators/90000057.html> orcid:0000-0001-8345-8583 , Lai, M. W. K., Mecking, J. V., Yeager, S. and Petit, T. <https://centaur.reading.ac.uk/view/creators/90010964.html> orcid:0000-0002-7922-9363 (2024) Large diversity in AMOC internal variability across NEMO-based climate models. Climate Dynamics, 62 (5). pp. 3355-3374. ISSN 1432-0894 doi: https://doi.org/10.1007/s00382-023-07069-y <https://doi.org/10.1007/s00382-023-07069-y> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1007/s00382-023-07069-y |
container_title |
Climate Dynamics |
container_volume |
62 |
container_issue |
5 |
container_start_page |
3355 |
op_container_end_page |
3374 |
_version_ |
1809762229259599872 |