Preindustrial Control Simulations With HadGEM3-GC3.1 for CMIP6

Preindustrial control simulations with the third Hadley Centre Global Environmental Model,run in the Global Coupled configuration 3.1 of the Met Office Unified Model (HadGEM3-GC3.1) are presentedat two resolutions. These are N216ORCA025, which has a horizontal resolution of 60 km in the atmospherean...

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Bibliographic Details
Published in:Journal of Advances in Modeling Earth Systems
Main Authors: Menary, Matthew B., Kuhlbrodt, Till, Ridley, Jeff, Andrews, Martin B., Dimdore‐Miles, Oscar B., Deshayes, Julie, Eade, Rosie, Gray, Lesley, Ineson, Sarah, Mignot, Juliette, Roberts, Christopher D., Robson, Jon, Wood, Richard A., Xavier, Prince
Language:unknown
Published: 2023
Subjects:
58 GEOSCIENCES
54 ENVIRONMENTAL SCIENCES
97 MATHEMATICS AND COMPUTING
Antarctic
The Antarctic
Antarc*
Online Access:http://www.osti.gov/servlets/purl/1565753
https://www.osti.gov/biblio/1565753
https://doi.org/10.1029/2018ms001495
Description
Summary:Preindustrial control simulations with the third Hadley Centre Global Environmental Model,run in the Global Coupled configuration 3.1 of the Met Office Unified Model (HadGEM3-GC3.1) are presentedat two resolutions. These are N216ORCA025, which has a horizontal resolution of 60 km in the atmosphereand 0.25° in the ocean, and N96ORCA1, which has a horizontal resolution of 130 km in the atmosphereand 1° in the ocean. The aim of this study is to document the climate variability in these simulations, makecomparisons against present-day observations (albeit under different forcing), and discuss differencesarising due to resolution. In terms of interannual variability in the leading modes of climate variability thetwo resolutions behave generally very similarly. Notable differences are in the westward extent of El Niñoand the pattern of Atlantic multidecadal variability, in which N216ORCA025 compares more favorably toobservations, and in the Antarctic Circumpolar Current, which is far too weak in N216ORCA025. In the NorthAtlantic region, N216ORCA025 has a stronger and deeper Atlantic Meridional Overturning Circulation, whichcompares well against observations, and reduced biases in temperature and salinity in the North Atlanticsubpolar gyre. These simulations are being provided to the sixth Coupled Model Intercomparison Project(CMIP6) and provide a baseline against which further forced experiments may be assessed.

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