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  Sensitivity of the Atlantic Meridional Overturning Circulation to model resolution in CMIP6 HighResMIP simulations and implications for future changes

Roberts, M., Jackson, L. C., Roberts, C. D., Meccia, V., Docquier, D., Koenigk, T., et al. (2020). Sensitivity of the Atlantic Meridional Overturning Circulation to model resolution in CMIP6 HighResMIP simulations and implications for future changes. Journal of Advances in Modeling Earth Systems, 12: e2019MS002014. doi:10.1029/2019MS002014.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A212-F Version Permalink: http://hdl.handle.net/21.11116/0000-0006-FEBC-9
Genre: Journal Article

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 Creators:
Roberts, M.J., Author
Jackson, L. C., Author
Roberts, C. D., Author
Meccia, V., Author
Docquier, D., Author
Koenigk, T., Author
Ortega, P., Author
Moreno-Chamarro, E., Author
Bellucci, A., Author
Coward, A., Author
Drijfhout, S., Author
Exarchou, E., Author
Gutjahr, Oliver1, Author              
Hewitt, H., Author
Iovino, D., Author
Lohmann, Katja1, Author              
Putrasahan, Dian2, Author              
Schiemann, R., Author
Seddon, J., Author
Terray, L., Author
Xu, X., AuthorZhang, Q., AuthorChang, P., AuthorYeager, S. G., AuthorCastruccio, F. S., AuthorZhang, S., AuthorWu, L., Author more..
Affiliations:
1Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913553              
2Ocean Statistics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society, ou_913558              

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 Abstract: A multimodel, multiresolution ensemble using Coupled Model Intercomparison Project Phase 6 (CMIP6) High Resolution Model Intercomparison Project (HighResMIP) coupled experiments is used to assess the performance of key aspects of the North Atlantic circulation. The Atlantic Meridional Overturning Circulation (AMOC), and related heat transport, tends to become stronger as ocean model resolution is enhanced, better agreeing with observations at 26.5°N. However, for most models the circulation remains too shallow compared to observations and has a smaller temperature contrast between the northward and southward limbs of the AMOC. These biases cause the northward heat transport to be systematically too low for a given overturning strength. The higher-resolution models also tend to have too much deep mixing in the subpolar gyre. In the period 2015–2050 the overturning circulation tends to decline more rapidly in the higher-resolution models, which is related to both the mean state and to the subpolar gyre contribution to deep water formation. The main part of the decline comes from the Florida Current component of the circulation. Such large declines in AMOC are not seen in the models with resolutions more typically used for climate studies, suggesting an enhanced risk for Northern Hemisphere climate change. However, only a small number of different ocean models are included in the study. © 2020. American Geophysical Union. All Rights Reserved.

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Language(s): eng - English
 Dates: 2019-122020-072020-08-012020-08-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2019MS002014
 Degree: -

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Project name : PRIMAVERA
Grant ID : 641727
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Journal of Advances in Modeling Earth Systems
  Other : JAMES
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 12 Sequence Number: e2019MS002014 Start / End Page: - Identifier: ISSN: 1942-2466
CoNE: https://pure.mpg.de/cone/journals/resource/19422466