Altimetry-Derived Gravity Predictions of Bathymetry by the Gravity-Geologic Method |
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| Authors: | Jeong Woo Kim Ralph R B von Frese Bang Yong Lee Daniel R Roman Seong-Jae Doh |
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| Institution: | (1) Department of Geomatics Engineering, University of Calgary, Calgary, AB, T2N1N4, Canada;(2) School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA;(3) Korea Polar Research Institute, Incheon, 406-840, Korea;(4) National Geodetic Survey, NOAA, 1315 East–West Highway, Silver Spring, MD 20910, USA;(5) Department of Earth and Environmental Sciences, Korea University, Seoul, 136-713, Korea |
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| Abstract: | The gravity-geologic method (GGM) was implemented for 2′ by 2′ bathymetric determinations in a 1.6° longitude-by-1.0° latitude
region centered on the eastern end of the Shackleton Fracture Zone in the Drake Passage, Antarctica. The GGM used the Bouguer
slab approximation to process satellite altimetry-derived marine free-air gravity anomalies and 6,548 local shipborne bathymetric
sounding measurements from the Korea Ocean Research and Development Institute to update the surrounding off-track bathymetry.
The limitations of the Bouguer slab for modeling the gravity effects of variable density, rugged bathymetric relief at distances
up to several kilometers, were mitigated by establishing ‘tuning’ densities that stabilized the GGM predictions. Tests using
two-thirds of the shipborne bathymetric measurements to estimate the remaining third indicated that the tuning densities minimized
root-mean-square deviations to about 29 m. The optimum GGM bathymetry model honoring all the ship observations correlated
very well with widely available bathymetry models, despite local differences that ranged up to a few kilometers. The great
analytical simplicity of GGM facilitates accurately and efficiently updating bathymetry as new gravity and bathymetric sounding
data become available. Furthermore, the availability of marine free-air gravity anomaly data ensures that the GGM is more
effective than simply extrapolating or interpolating ship bathymetry coverage into unmapped regions. |
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