Comparison of Satellite Altimetric Gravity and Ship-borne Gravity - Offshore Western Australia

Asbjorn Norlund Christensen; Ole B. Andersen

doi:10.1071/ASEG2016ab242

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Comparison of Satellite Altimetric Gravity and Ship-borne Gravity - Offshore Western Australia
Authors Asbjorn Norlund Christensen^a and Ole B. Andersen^b
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^a Nordic Geoscience, Melbourne, , Australia, [email protected] ^b DTU Space Kgs Lyngby, , Denmark, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2016ab242
- Published online: 01 Dec 2016

Abstract

Since 2010 several new satellite altimetry missions have commenced delivering altimetry-derived gravity data with a global offshore coverage and with a quality in many regions nearing that of ship-borne gravity observations. This is resulting in greatly improved global offshore high resolution gravity fields.

The DTU13 and Sandwell and Smith’s v23.1 grids of altimetric gravity anomalies from offshore Western Australia are compared with ship-track gravity anomalies computed from the Geoscience Australia marine gravity database. The standard deviation of the difference between the ship-borne gravity data and the satellite altimetric gravity data is 3.1mGal for the DTU13 data and 3.3 mGal for Sandwell and Smith’s v23.1 grid. In water depths less than 20m we observed significant differences between ship-borne gravity and altimetric gravity. Over the sampled wavelengths, the DTU13 altimetric gravity data appears to have the best resemblance to the reference marine gravity data, exhibiting the overall least difference amplitude over most wavelengths.

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2016-12-01

2026-01-17

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References

Andersen, O.B., Knudsen, P., and Berry, P.A.M., 2010, The DNSC08GRA global marine gravity field from double retracked satellite altimetry: Journal of Geodesy, 84, 3, 191-199.
Andersen, O.B., Knudsen, P., Kenyon, S., and Holmes, S., 2014, Global and Arctic Marine Gravity Field From Recent Satellite Altimetry (DTU13): 76th EAGE Conference Extended Abstracts.
Christensen, A., N., and Andersen, O.B., 2015, Comparison of satellite altimeter-derived gravity data and marine gravity data, 77th EAGE Conference Extended Abstracts.
Featherstone, W., 2003, Comparison of Different Satellite Altimeter-Derived Gravity Anomaly Grids with Ship-Borne Gravity Data Around Australia: in Tziavos, I.N., (ed), 3rd Meeting of the International Gravity and Geoid Commission, pp. 326-331.
Pavlis, N.K., Holmes, S.A., Kenyon, S.C., and Factor, J.K., 2012, The development and evaluation of the Earth Gravitational Model 2008 (EGM2008): Journal of Geophysical Research: Solid Earth (1978-2012) Volume 117, B04406,
Sandwell, D.T., Garcia, E., Soofi, K., Wessel, P., Chandler, M., and Smith, W.H.F., 2013. Towards 1-mGal accuracy in global marine gravity from Cryosat-2, Envisat and Jason-1: The Leading Edge, SEG, Houston, August 2013, 892-898.
Sandwell, D.T., R.D. Muller, W.H.F. Smith, E. Garcia, and R. Francis, 2014. New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure, Science, October 2014, 65-67.

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Article Type: Research Article

Keyword(s): marine gravity; offshore Western Australia; satellite gravity

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