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Determination of gravity anomaly at sea level from inversion of satellite gravity gradiometric data
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
2011 (English)In: Journal of Geodynamics, ISSN 0264-3707, Vol. 51, no 5, 366-377 p.Article in journal (Refereed) Published
Abstract [en]

Gravity gradients can be used to determine the local gravity field of the Earth. This paper investigates downward continuation of all elements of the disturbing gravitational tensor at satellite level using the second-order partial derivatives of the extended Stokes formula in the local-north oriented frame to determine the gravity anomaly at sea level. It considers the inversion of each gradient separately as well as their joint inversion. Numerical studies show that the gradients T-zz, T-xx, T-yy and T-xz have similar capability of being continued downward to sea level in the presence of white noise, while the gradient T-yz is considerably worse than the others. The bias-corrected joint inversion process shows the possibility of recovering the gravity anomaly with 1 mGal accuracy. Variance component estimation is also tested to update the observation weights in the joint inversion.

Place, publisher, year, edition, pages
2011. Vol. 51, no 5, 366-377 p.
Keyword [en]
Bias-correction, Downward continuation, Joint inversion, Tikhonov's regularization, Variance component estimation
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-32619DOI: 10.1016/j.jog.2010.11.001ISI: 000288979900007Scopus ID: 2-s2.0-79952037156OAI: oai:DiVA.org:kth-32619DiVA: diva2:411701
Note
QC 20110419Available from: 2011-04-19 Created: 2011-04-18 Last updated: 2011-04-19Bibliographically approved

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Eshagh, MehdiSjöberg, Lars Erik
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