Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes
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 Overt...
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American Geophysical Union (AGU)
2020
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oai:doaj.org-article:8b74ce5a5c8441f78474dc0b3e65bb462021-11-15T14:20:27ZSensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes1942-246610.1029/2019MS002014https://doaj.org/article/8b74ce5a5c8441f78474dc0b3e65bb462020-08-01T00:00:00Zhttps://doi.org/10.1029/2019MS002014https://doaj.org/toc/1942-2466Abstract 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.Malcolm J. RobertsLaura C. JacksonChristopher D. RobertsVirna MecciaDavid DocquierTorben KoenigkPablo OrtegaEduardo Moreno‐ChamarroAlessio BellucciAndrew CowardSybren DrijfhoutEleftheria ExarchouOliver GutjahrHelene HewittDoroteaciro IovinoKatja LohmannDian PutrasahanReinhard SchiemannJon SeddonLaurent TerrayXiaobiao XuQiuying ZhangPing ChangStephen G. YeagerFrederic S. CastruccioShaoqing ZhangLixin WuAmerican Geophysical Union (AGU)articleocean circulationAtlanticmodel resolutionAMOCfuture projectionPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 12, Iss 8, Pp n/a-n/a (2020) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
ocean circulation Atlantic model resolution AMOC future projection Physical geography GB3-5030 Oceanography GC1-1581 |
| spellingShingle |
ocean circulation Atlantic model resolution AMOC future projection Physical geography GB3-5030 Oceanography GC1-1581 Malcolm J. Roberts Laura C. Jackson Christopher D. Roberts Virna Meccia David Docquier Torben Koenigk Pablo Ortega Eduardo Moreno‐Chamarro Alessio Bellucci Andrew Coward Sybren Drijfhout Eleftheria Exarchou Oliver Gutjahr Helene Hewitt Doroteaciro Iovino Katja Lohmann Dian Putrasahan Reinhard Schiemann Jon Seddon Laurent Terray Xiaobiao Xu Qiuying Zhang Ping Chang Stephen G. Yeager Frederic S. Castruccio Shaoqing Zhang Lixin Wu Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| description |
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. |
| format |
article |
| author |
Malcolm J. Roberts Laura C. Jackson Christopher D. Roberts Virna Meccia David Docquier Torben Koenigk Pablo Ortega Eduardo Moreno‐Chamarro Alessio Bellucci Andrew Coward Sybren Drijfhout Eleftheria Exarchou Oliver Gutjahr Helene Hewitt Doroteaciro Iovino Katja Lohmann Dian Putrasahan Reinhard Schiemann Jon Seddon Laurent Terray Xiaobiao Xu Qiuying Zhang Ping Chang Stephen G. Yeager Frederic S. Castruccio Shaoqing Zhang Lixin Wu |
| author_facet |
Malcolm J. Roberts Laura C. Jackson Christopher D. Roberts Virna Meccia David Docquier Torben Koenigk Pablo Ortega Eduardo Moreno‐Chamarro Alessio Bellucci Andrew Coward Sybren Drijfhout Eleftheria Exarchou Oliver Gutjahr Helene Hewitt Doroteaciro Iovino Katja Lohmann Dian Putrasahan Reinhard Schiemann Jon Seddon Laurent Terray Xiaobiao Xu Qiuying Zhang Ping Chang Stephen G. Yeager Frederic S. Castruccio Shaoqing Zhang Lixin Wu |
| author_sort |
Malcolm J. Roberts |
| title |
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| title_short |
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| title_full |
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| title_fullStr |
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| title_full_unstemmed |
Sensitivity of the Atlantic Meridional Overturning Circulation to Model Resolution in CMIP6 HighResMIP Simulations and Implications for Future Changes |
| title_sort |
sensitivity of the atlantic meridional overturning circulation to model resolution in cmip6 highresmip simulations and implications for future changes |
| publisher |
American Geophysical Union (AGU) |
| publishDate |
2020 |
| url |
https://doaj.org/article/8b74ce5a5c8441f78474dc0b3e65bb46 |
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