The north-south tilt in the Australian Height Datum is explained by the ocean's mean dynamic topography

Using geodetic and oceanographic data, we show that the apparent north‐south slope between the Australian Height Datum (AHD) and the geoid is caused almost completely by the ocean's time‐mean dynamic topography (MDT). This is because the AHD was constrained to zero height at local mean sea leve...

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Bibliographic Details
Published in:Journal of Geophysical Research: Oceans 2012-08, Vol.117 (C8), p.n/a
Main Authors: Featherstone, W. E., Filmer, M. S.
Format: Article
Language:English
Subjects:
apparent sea level slope
coastal mean dynamic topography
Earth sciences
Earth, ocean, space
Exact sciences and technology
geodetic leveling
geoid
Marine
mean sea level
vertical geodetic datums
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Summary:Using geodetic and oceanographic data, we show that the apparent north‐south slope between the Australian Height Datum (AHD) and the geoid is caused almost completely by the ocean's time‐mean dynamic topography (MDT). This is because the AHD was constrained to zero height at local mean sea level at multiple tide gauges around the Australian continent. Using MDT models and corrected leveling data, almost all of the apparent north‐south slope can be removed from the AHD. An auxiliary observation is that a satellite‐only MDT model based on only around one year of GOCE data generates results commensurate with geodetic, oceanographic and combined MDT models. Key Points MDT explains north‐south tilt in AHD The apparent sea level slope problem in Australia is solved GOCE‐based MDT models show promise
ISSN:0148-0227
2169-9275
2156-2202
2169-9291
DOI:10.1029/2012JC007974