Articles | Volume 16, issue 1
https://doi.org/10.5194/gmd-16-211-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-16-211-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Model experiment description paper
| 
09 Jan 2023
Model experiment description paper |
| 09 Jan 2023
| 09 Jan 2023
Moana Ocean Hindcast – a > 25-year simulation for New Zealand waters using the Regional Ocean Modeling System (ROMS) v3.9 model
Joao Marcos Azevedo Correia de Souza
CORRESPONDING AUTHOR
MetOcean Solutions, Meteorological Service of New Zealand, Raglan 3225, New Zealand
Sutara H. Suanda
Department of Physics and Physical Oceanography, University of North Carolina Wilmington, Wilmington, North Carolina, USA
Department of Marine Science, University of Otago, Otago 9016, New Zealand
Phellipe P. Couto
MetOcean Solutions, Meteorological Service of New Zealand, Raglan 3225, New Zealand
Department of Marine Science, University of Otago, Otago 9016, New Zealand
Robert O. Smith
Department of Marine Science, University of Otago, Otago 9016, New Zealand
Colette Kerry
School of Biological, Earth & Environmental Sciences, UNSW Sydney, Sydney, NSW 2052, Australia
Moninya Roughan
School of Biological, Earth & Environmental Sciences, UNSW Sydney, Sydney, NSW 2052, Australia
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We show the importance of assimilating subsurface temperature and velocity data in a model of the East Auckland Current. Assimilation of velocity increased the representation of large oceanic vortexes. Assimilation of temperature is needed to correctly simulate temperatures around 100 m depth, which is the most difficult region to simulate in ocean models. Our simulations showed improved results in comparison to the US Navy global model and highlight the importance of regional models.
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Ocean eddies are important for weather, climate, biology, navigation, and search and rescue. Since eddies change rapidly, models that incorporate or assimilate observations are required to produce accurate eddy timings and locations, yet the model accuracy is rarely assessed below the surface. We use a unique type of ocean model experiment to assess three-dimensional eddy structure in the East Australian Current and explore two pathways in which this subsurface structure is being degraded.
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The ocean current flowing along the southeastern coast of Australia is called the East Australian Current (EAC). Using computer simulations, we tested how surface and subsurface observations might improve models of the EAC. Subsurface observations are particularly important for improving simulations, and if made in the correct location and time, can have impact 600 km upstream. The stability of the current affects model estimates could be capitalized upon in future observing strategies.
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Short summary
The current paper describes the configuration and evaluation of the Moana Ocean Hindcast, a > 25-year simulation of the ocean state around New Zealand using the Regional Ocean Modeling System v3.9. This is the first open-access, long-term, continuous, realistic ocean simulation for this region and provides information for improving the understanding of the ocean processes that affect the New Zealand exclusive economic zone.
The current paper describes the configuration and evaluation of the Moana Ocean Hindcast, a...
