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

被引：16

作者：

Lavallee, D. A. ^{[1
,2
]}

Moore, P. ^{[2
]}

Clarke, P. J. ^{[2
]}

Petrie, E. J. ^{[2
]}

van Dam, T. ^{[3
]}

King, M. A. ^{[2
]}

机构：

[1] Delft Univ Technol, DEOS, NL-2629 HS Delft, Netherlands

[2] Newcastle Univ, Sch Civil Engn & Geosci, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[3] Univ Luxembourg, Fac Sci Technol & Commun, L-1359 Luxembourg, Luxembourg

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

基金：

英国自然环境研究理事会;

关键词：

GRAVITATIONAL CHANGES; EARTH ROTATION; MASS; CLIMATE; REDISTRIBUTION; HARMONICS; SYSTEM;

D O I：

10.1029/2010GL045229

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页数：5

共 25 条

[1] Constraints on mantle anelasticity from geodetic observations, and implications for the J2 anomaly [J].

Benjamin, David ;

Wahr, John ;

Ray, Richard D. ;

Egbert, Gary D. ;

Desai, Shailen D. .

GEOPHYSICAL JOURNAL INTERNATIONAL, 2006, 165 (01) :3-16

[2] Time-variable gravity signal of an anomalous redistribution of water mass in the extratropic Pacific during 1998-2002 [J].

Chao, BF ;

Au, AY ;

Boy, JP ;

Cox, CM .

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS, 2003, 4

[3] Assessment of Degree-2 Zonal Gravitational Changes from GRACE, Earth Rotation, Climate Models, and Satellite Laser Ranging [J].

Chen, J. L. ;

Wilson, C. R. .

GRAVITY, GEOID AND EARTH OBSERVATION, 2010, 135 :669-676

[4] S2 tide aliasing in GRACE time-variable gravity solutions [J].

Chen, J. L. ;

Wilson, C. R. ;

Seo, Ki-Weon .

JOURNAL OF GEODESY, 2009, 83 (07) :679-687

[5] Low degree gravity changes from GRACE, Earth rotation, geophysical models, and satellite laser ranging [J].

Chen, J. L. ;

Wilson, C. R. .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2008, 113 (B6)

[6] A new assessment of long-wavelength gravitational variations [J].

Chen, JL ;

Wilson, CR ;

Eanes, RJ ;

Tapley, BD .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2000, 105 (B7) :16271-16277

[7] Low degree gravitational changes from earth rotation and geophysical models [J].

Chen, JL ;

Wilson, CR .

GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (24)

[8] Variations in the Earth's oblateness during the past 28 years [J].

Cheng, MK ;

Tapley, BD .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2004, 109 (B9) :B094021-9

[9] Seasonal variations in low degree zonal harmonics of the Earth's gravity field from satellite laser ranging observations [J].

Cheng, MK ;

Tapley, BD .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1999, 104 (B2) :2667-2681

[10] Basis functions for the consistent and accurate representation of surface mass loading [J].

Clarke, Peter J. ;

Lavallee, David A. ;

Blewitt, Geoff ;

van Dam, Tonie .

GEOPHYSICAL JOURNAL INTERNATIONAL, 2007, 171 (01) :1-10

← 1 2 3 →