Determination of gravity anomaly at sea level from inversion of satellite gravity gradiometric data
2011 (English)In: Journal of Geodynamics, ISSN 0264-3707, Vol. 51, no 5, 366-377 p.Article in journal (Refereed) Published
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.
Bias-correction, Downward continuation, Joint inversion, Tikhonov's regularization, Variance component estimation
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:kth:diva-32619DOI: 10.1016/j.jog.2010.11.001ISI: 000288979900007ScopusID: 2-s2.0-79952037156OAI: oai:DiVA.org:kth-32619DiVA: diva2:411701
QC 201104192011-04-192011-04-182011-04-19Bibliographically approved