Toggle Main Menu Toggle Search

Open Access padlockePrints

J2: An evaluation of new estimates from GPS, GRACE, and load models compared to SLR

Lookup NU author(s): Dr David Lavallee, Professor Philip Moore, Professor Peter Clarke, Dr Liz Petrie, Professor Matt King

Downloads

Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


Abstract

Changes in J2, resulting from past and present changes in Earth's climate, are traditionally observed by Satellite Laser ranging (SLR). Assuming an elastic Earth, it is possible to infer changes in J2 from changes in Earth's shape observed by GPS. We compare estimates of non-secular J2 changes from GPS, SLR, GRACE, and a load model. The GPS and SLR annual signals agree but are different (16%) to the load model. Subtraction of the load model removes the annual variation from GPS, SLR, and GRACE, and the semi-annual variation in GPS. The GPS and SLR long-term signals are highly correlated, but GPS is better correlated with the loading model. Subtraction of the load model removes the 1998 anomaly from the GPS J2 series but not completely from the SLR J2 series, suggesting that the SLR anomaly may not be entirely due to mass re-distribution as has been presumed. Citation: Lavallee, D. A., P. Moore, P. J. Clarke, E. J. Petrie, T. van Dam, and M. A. King (2010), J2: An evaluation of new estimates from GPS, GRACE, and load models compared to SLR, Geophys. Res. Lett., 37, L22403, doi:10.1029/2010GL045229.


Publication metadata

Author(s): Lavallee DA, Moore P, Clarke PJ, Petrie EJ, van Dam T, King MA

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2010

Volume: 37

Issue: 22

Print publication date: 01/11/2010

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: American Geophysical Union

URL: http://dx.doi.org/10.1029/2010GL045229

DOI: 10.1029/2010GL045229


Altmetrics

Altmetrics provided by Altmetric


Actions

Find at Newcastle University icon    Link to this publication


Share