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


Lavallee, DA and Moore, P and Clarke, PJ and Petrie, EJ and Van Dam, T and King, MA, J2: An evaluation of new estimates from GPS, GRACE, and load models compared to SLR, Geophysical Research Letters, 37, (22) ISSN 0094-8276 (2010) [Refereed Article]

DOI: doi:10.1029/2010GL045229


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. © 2010 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Keywords:Earth's climate; Highly-correlated; Load models; Loading models; Past and present; Re-distribution; Satellite laser ranging; Earth (planet); Geodetic satellites; annual variation; climate change; GPS; GRACE; model test; satellite laser ranging
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Physical geography and environmental geoscience not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:King, MA (Professor Matt King)
ID Code:82147
Year Published:2010
Web of Science® Times Cited:13
Deposited By:Geography and Environmental Studies
Deposited On:2013-01-16
Last Modified:2013-01-16

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