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The Low‐Resolution Version of HadGEM3 GC3.1: Development and Evaluation for Global Climate

Open access
Kuhlbrodt, Till, Jones, Colin G., Sellar, Alistair, Storkey, Dave, Blockley, Ed, Stringer, Marc, Hill, Richard, Graham, Tim, Ridley, Jeff, Blaker, Adam, Calvert, Daley, Copsey, Dan, Ellis, Richard, Hewitt, Helene, Hyder, Patrick, Ineson, Sarah, Mulcahy, Jane, Siahaan, Antony, Walton, Jeremy·2018·Journal of Advances in Modeling Earth Systems

Abstract

A new climate model, HadGEM3 N96ORCA1, is presented that is part of the GC3.1 configuration of HadGEM3. N96ORCA1 has a horizontal resolution of ~135 km in the atmosphere and 1° in the ocean and requires an order of magnitude less computing power than its medium‐resolution counterpart, N216ORCA025, while retaining a high degree of performance traceability. Scientific performance is compared to both observations and the N216ORCA025 model. N96ORCA1 reproduces observed climate mean and variability almost as well as N216ORCA025. Patterns of biases are similar across the two models. In the northwest Atlantic, N96ORCA1 shows a cold surface bias of up to 6 K, typical of ocean models of this resolution. The strength of the Atlantic meridional overturning circulation (16 to 17 Sv) matches observations. In the Southern Ocean, a warm surface bias (up to 2 K) is smaller than in N216ORCA025 and linked to improved ocean circulation. Model El Niño/Southern Oscillation and Atlantic Multidecadal Variability are close to observations. Both the cold bias in the Northern Hemisphere (N96ORCA1) and the warm bias in the Southern Hemisphere (N216ORCA025) develop in the first few decades of the simulations. As in many comparable climate models, simulated interhemispheric gradients of top‐of‐atmosphere radiation are larger than observations suggest, with contributions from both hemispheres. HadGEM3 GC3.1 N96ORCA1 constitutes the physical core of the UK Earth System Model (UKESM1) and will be used extensively in the Coupled Model Intercomparison Project 6 (CMIP6), both as part of the UK Earth System Model and as a stand‐alone coupled climate model.

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Metadata

Authors
Kuhlbrodt, T., Jones, C. G., Sellar, A., Storkey, D., Blockley, E., Stringer, M., Hill, R., Graham, T., Ridley, J., Blaker, A., Calvert, D., Copsey, D., Ellis, R., Hewitt, H., Hyder, P., Ineson, S., Mulcahy, J., Siahaan, A., & Walton, J.
Venue
Journal of Advances in Modeling Earth Systems
Published
2018-11
Volume
10
Issue
11
Pages
2865-2888
ISSN
1942-2466 (ISSN-L)
OpenAlex
W2899086334
Cited by
331
References
66
FWCI
12.95
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: The Low‐Resolution Version of HadGEM3 GC3.1: Development and Evaluation for Global Climate. https://app.cochat.ai/papers/10.1029/2018ms001370
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Kuhlbrodt, T., Jones, C. G., Sellar, A., Storkey, D., Blockley, E., Stringer, M., Hill, R., Graham, T., Ridley, J., Blaker, A., Calvert, D., Copsey, D., Ellis, R., Hewitt, H., Hyder, P., Ineson, S., Mulcahy, J., Siahaan, A., & Walton, J. (2018). The Low‐Resolution Version of HadGEM3 GC3.1: Development and Evaluation for Global Climate. Journal of Advances in Modeling Earth Systems. https://doi.org/10.1029/2018ms001370

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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