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Evaluation of a near-global eddy-resolving ocean model

journal contribution
posted on 2023-05-19, 08:50 authored by Oke, 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)

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