Simultaneous inversion of the Earth's mantle viscosity and ice mass imbalance in Antarctica and Greenland

Details Simultaneous inversion of the Earth's mantle viscosity and ice mass imbalance in Antarctica and Greenland Simultaneous inversion of the Earth's mantle viscosity and ice mass imbalance in Antarctica and Greenland

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.g51a..07s&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #G51A-07

Physics

1212 Earth'S Interior: Composition And State (8105), 1213 Earth'S Interior: Dynamics (8115, 8120), 1214 Geopotential Theory And Determination, 1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1243 Space Geodetic Surveys

Scientific paper

A self-consistent inversion procedure, based on the Levenberg-Marquardt method, has been used to invert simultaneously for the lower and upper mantle viscosity and for present-day ice mass loss in Antarctica and Greenland, within the framework of forward viscoelastic, stratified Earth's models based on an analytical, normal mode theory and on Satellite Laser Ranging data. The observational data are the even and odd zonal time variations of the Earth's gravity field, which we attribute to both Pleistocene deglaciation and present-day ice mass instabilities in Antarctica and Greenland. If Antarctica is considered as the only source of present-day melting, the lower mantle viscosity is about one order of magnitude higher than the upper mantle one and ice loss in Antarctica is -228 Gt/yr. If Greenland is also considered as a contributor to present-day melting, ice loss is partitioned between Antarctica and Greenland, with ice loss of -190 Gt/yr and -90 Gt/yr, respectively. The chi-square analysis show that Pleistocene deglaciation cannot be the only contributor to the time variations of the long-wavelength gravity field up to the harmonicdegree 8 and mass redistribution between the polar andf equatorial regions of the Earth is ongoing.

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