Evaluation of a near-global eddy-resolving ocean model
journal contribution
posted on 2023-05-19, 08:50authored byOke, PR, Griffin, DA, Andreas SchillerAndreas Schiller, Matear, R, Fiedler, R, Mansbridge, J, Lenton, A, Cahill, M, Chamberlain, MA, Ridgway, K
Analysis of the variability of the last 18 yr (1993- 2012) of a 32 yr run of a new near-global, eddy-resolving ocean general circulation model coupled with biogeochemistry is presented. Comparisons between modelled and observed mean sea level (MSL), mixed layer depth (MLD), sea level anomaly (SLA), sea surface temperature (SST), and chlorophyll a indicate that the model variability is realistic. We find some systematic errors in the modelled MLD, with the model generally deeper than observations, which results in errors in the chlorophyll a, owing to the strong biophysical coupling. We evaluate several other metrics in the model, including the zonally averaged seasonal cycle of SST, meridional overturning, volume transports through key straits and passages, zonally averaged temperature and salinity, and El Nĩno-related SST indices. We find that the modelled seasonal cycle in SST is 0.5-1.5 °C weaker than observed; volume transports of the Antarctic Circumpolar Current, the East Australian Current, and Indonesian Throughflow are in good agreement with observational estimates; and the correlation between the modelled and observed NINO SST indices exceeds 0.91. Most aspects of the model circulation are realistic. We conclude that the model output is suitable for broader analysis to better understand upper ocean dynamics and ocean variability at mid-And low latitudes. The new model is intended to underpin a future version of Australia's operational short-range ocean forecasting system.
History
Publication title
Geoscientific Model Development
Volume
6
Pagination
591-615
ISSN
1991-959X
Department/School
Institute for Marine and Antarctic Studies
Publisher
Copernicus GmbH
Place of publication
Germany
Repository Status
Restricted
Socio-economic Objectives
Oceanic processes (excl. in the Antarctic and Southern Ocean)