An Evaluation of New Estimates from GPS, GRACE and Load Models compared to SLR

Lavalee, D.; Moore, P.; Clarke, Peter J.; Petrie, E.; van Dam, Tonie; King, M.

doi:10.1029/2010GL045229

Reference : An Evaluation of New Estimates from GPS, GRACE and Load Models compared to SLR


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography Physical, chemical, mathematical & earth Sciences : Physics
	To cite this reference:	http://hdl.handle.net/10993/502

Title :	An Evaluation of New Estimates from GPS, GRACE and Load Models compared to SLR
Language :	English
Author, co-author :	Lavalee, D. [School of Civil Engineering and Geosciences, Newcastle University, UK]
	Moore, P. [School of Civil Engineering and Geosciences, Newcastle University, UK]
	Clarke, Peter J. [School of Civil Engineering and Geosciences, Newcastle University, UK]
	Petrie, E. [School of Civil Engineering and Geosciences, Newcastle University, UK]
	van Dam, Tonie [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
	King, M. [School of Civil Engineering and Geosciences, Newcastle University, UK]
Publication date :	2010
Journal title :	Geophysical Research Letters
Publisher :	American Geophysical Union
Issue/season :	37
Pages :	5-6
Peer reviewed :	Yes (verified by ORBi^lu)
Audience :	International
ISSN :	0094-8276
e-ISSN :	0094-8276
City :	Washington
Country :	DC
Keywords :	[en] J2 ; GPS ; GRACE ; SLR ; climate
Abstract :	[en] 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.
Permalink :	http://hdl.handle.net/10993/502
DOI :	10.1029/2010GL045229

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