Articles | Volume 17, issue 6
Model description paper
22 Mar 2024
Model description paper |  | 22 Mar 2024

Comparison of 4-dimensional variational and ensemble optimal interpolation data assimilation systems using a Regional Ocean Modeling System (v3.4) configuration of the eddy-dominated East Australian Current system

Colette Gabrielle Kerry, Moninya Roughan, Shane Keating, David Gwyther, Gary Brassington, Adil Siripatana, and Joao Marcos A. C. Souza

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Cited articles

Andreu-Burillo, I., Brassington, G., Oke, P., and Beggs, H.: Including a new data stream in the BLUElink Ocean Data Assimilation System, Aust. Meteorol. Ocean., 59, 77–86, 2010. a
Archer, M., Roughan, M., Keating, S., and Schaeffer, A.: On the variability of the East Australian Current: Jet structure, meandering, and influence on shelf circulation, J. Geophys. Res.-Oceans, 122, 8464–8481, 2017. a
AVISO: SSALTO/DUACS user handbook: (M)SLA and (M)ADT near-real time and delayed time products. CLS-DOS-NT-06-034, SALP-MU-P-EA-21065-CLS, CNES, 66 pp., (last access: 6 March 2024), 2015. a
Ballarotta, M., Ubelmann, C., Veillard, P., Prandi, P., Etienne, H., Mulet, S., Faugère, Y., Dibarboure, G., Morrow, R., and Picot, N.: Improved global sea surface height and current maps from remote sensing and in situ observations, Earth Syst. Sci. Data, 15, 295–315,, 2023. a
Brassington, G. B., Sakov, P., Divakaran, P., Aijaz, S., Sweeney-Van Kinderen, J., Huang, X., and Allen, S.: OceanMAPS v4. 0i: a global eddy resolving EnKF ocean forecasting system, in: OCEANS 2023-Limerick, IEEE, 1–8,, 2023. a, b, c
Short summary
Ocean forecasting relies on the combination of numerical models and ocean observations through data assimilation (DA). Here we assess the performance of two DA systems in a dynamic western boundary current, the East Australian Current, across a common modelling and observational framework. We show that the more advanced, time-dependent method outperforms the time-independent method for forecast horizons of 5 d. This advocates the use of advanced methods for highly variable oceanic regions.