Recent earth oblateness variations: Unraveling climate and postglacial rebound effects

Science

Volumn 298, Issue 5600, 2002, Pages 1975-1977

  Dickey, Jean O ^a   Marcus, Steven L ^a   De Viron, Olivier ^b   Fukumori, Ichiro ^a  

^a CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^b ROYAL OBSERVATORY OF BELGIUM   (Belgium)

Author keywords

[No Author keywords available]

Indexed keywords

CLIMATOLOGY; GLACIERS; SATELLITES;

OCEANIC MASS;

GEOPHYSICS;

CLIMATE EFFECT; POSTGLACIAL REBOUND; SHAPE;

ARTICLE; ASTRONOMY; ATMOSPHERE; CLIMATE CHANGE; ENVIRONMENTAL CHANGE; ENVIRONMENTAL TEMPERATURE; GEOGRAPHIC DISTRIBUTION; GLACIAL MASS BALANCE; GRAVITY; MELTING POINT; PRIORITY JOURNAL; SEA;

EID: 0037032824     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1077777     Document Type: Article

References (29)

1. J. O. Dickey et at., Satellite Gravity and the Geosphere (National Research Council, Washington, DC, 1997).
2. 2 are given in the SOM Text.
3. C. F. Yoder et at., Nature 307, 757 (1983).
4. F. R. Stephenson, L. V. Morrison, Philos. Trans. R. Soc. A 351, 165 (1995).
5. C. M. Cox, B. F. Chao, Science 297, 831 (2002).
6. A. Cazenave, R. S. Nerem, Science 297, 783 (2002).
7. S. R. Hare, N. J. Mantua, Progr. Oceanogr. 47, 103 (2000).
8. T/P and XBT data were assimilated into the model run starting in 1993. Further details regarding the ECCO assimilation system are available at www.ecco-group.org. A brief summary is given in the SOM Text.
9. E. Rignot, R. H. Thomas, Science 297, 1502 (2002).
10. M. B. Dyurgerov, M. F. Meier, Arct. Alpine Res. 29, 379 (1997).
11. _, Arct. Alpine Res. 29, 392 (1997).
12. _, Proc. Natl. Acad. Sci. U.S.A. 97, 1406 (2000).
13. Annual volume changes in subpolar and mountain glaciers were obtained from the NSIDC Web site www-nsidc.colorado.edu/sotc/glacier_balance.html, courtesy of M. Dyurgerov, Institute of Arctic and Alpine Research, University of Colorado, Boulder.
14. T. S. James, E. R. Ivins, J. Geophys. Res. 102, 605 (1997).
15. 2 contribution, the model bottom pressures are adjusted uniformly such that the global ocean mass is time-invariant.
16. E. M. Kalnay et al., Bull. Am. Meteorol. Soc. 77, 437 (1996).
17. The IB assumption accounts for oceanic compensation of atmospheric loading by substituting a spatially averaged uniform surface pressure field over the global ocean.
18. Because atmospheric pressure trends over Antarctica are poorly constrained due to a lack of data and calibration problems (19, 20), we extended the IB assumption to include the land surface of Antarctica in this study.
19. K. M. Hines, D. H. Bromwich, G. J. Marshall, J. Clim. 13, 3940 (2000).
20. G. J. Marshall, J. Clim. 15, 659 (2002).
21. The model bottom pressure is directly proportional to the mass-per-unit area above a given point.
22. P. Johnston, K. Lambeck, Geophys. J. Int. 136, 537 (1999).
23. R. Devoti et al., Geophys. Res. Lett. 28, 855 (2001).
24. R. Sabadini, B. L. A. Vermeersen, in Ice Sheets, Sea Level and the Dynamic Earth, vol. 29 of Geodynamics Series, J. X. Mitrovica, B. L. A. Vermeersen, Eds. (American Geophysical Union, Washington, DC, 2002).
25. J. Hansen et al., J. Geophys. Res. 104, 30,997 (1999).
26. J. Oerlemans, Ann. Glaciol. 31, 44 (2000).
27. H. J. Zwally et al., Science 297, 218 (2002).
28. D. Adam, Nature 416, 10 (2002)
29. The authors gratefully acknowledge discussions (both oral and via e-mail) with J.-P. Boy, D. Bromwich, B. F. Chao, Y. Chao, C. M. Cox, M. B. Dyurgerov, L.-L. Fu, M. Ghil, E. Ivins, K. Mo, and Y.Yung, and the constructive comments of the reviewers. The work of J.O.D., S.L.M., and I.F. presents the results of one phase of research carried out at the Jet Propulsion Laboratory, under contract with the National Aeronautics and Space Administration. O.D.V. is a postdoctoral researcher of the National Fund for Scientific Research, Belgium. This work was accomplished during O.D.V.'s visit to JPL during Summer 2002. This is a contribution of the ECCO consortium funded by the National Oceanographic Partnership Program.