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1 May 2009 Assessment of Geoid Models Offshore Western Australia Using In-Situ Measurements
Xiaoli Deng, Richard Coleman, Will E. Featherstone, Ken R. Ridgway
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Abstract

In Western Australia, coastal dynamics are influenced by a major ocean boundary current system, the Leeuwin Current, which is characterised by mesoscale features. To fully understand the Leeuwin Current using satellite altimeter measurements, we must have a precise (1–2 cm) and full-spatial-scale (<100 km) geoid model. This paper focuses on a comparison between two mean dynamic ocean topography models derived from independent hydrographic climatologies, and an altimeter-observed mean sea surface referenced to recently released geoid models offshore of Western Australia (20°S to 45°S, 108°E to 130°E). The geoid models used include combined global geopotential models from the GRACE satellite mission and AUSGeoid98. The estimated mean dynamic ocean topography models are compared with independent dynamic ocean topography from CSIRO's Atlas of Regional Seas (CARS) climatology. The results show that the EIGEN_GL04C and GGM02C EGM96 global geopotential models to degree and order 360 give the best comparisons against CARS in the Leeuwin Current region, suggesting that they should be used in the future for computing ocean transport, surface current velocities, and dynamic topography, and be used as a reference field for future computations of regional marine geoid models.

Xiaoli Deng, Richard Coleman, Will E. Featherstone, and Ken R. Ridgway "Assessment of Geoid Models Offshore Western Australia Using In-Situ Measurements," Journal of Coastal Research 2009(253), 581-588, (1 May 2009). https://doi.org/10.2112/07-0972.1
Received: 8 November 2007; Accepted: 25 March 2008; Published: 1 May 2009
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KEYWORDS
AUSGeoid98
CSIRO Atlas of Regional Seas (CARS)
dynamic ocean topography
Global geopotential model
mean sea surface
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