NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Constraints on mantle viscosity from relative sea level variations in Hudson BayFrechet kernels for the RSL data in Hunson Bay are computed to determine the detailed depth-dependent sensitivity of the data to variations in a viscosity profile which is consistent with the past inferences. The RSL data provide a robust constraint on the average viscosity in the top half of the lower mantle only (the average must be near 10 exp 21 Pa s). The data admit models whose average viscosity in the deep mantle (below 1800 km depth) and in the upper mantle can differ significantly from the value (near 10 exp 21 Pa s) estimated for the top half of the lower mantle. The total variation in the viscosity from the surface to the CMB can exceed an order of magnitude or more and still satisfy the constraint provided by the Hudson Bay RSL data set. The necessity of invoking an isoviscous mantle model in previous studies is a consequence of the limited class of viscosity model solutions employed in those studies.
Document ID
19920064802
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mitrovica, J. X.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Peltier, W. R.
(Toronto, University Canada)
Date Acquired
August 15, 2013
Publication Date
June 19, 1992
Publication Information
Publication: Geophysical Research Letters
Volume: 19
Issue: 12 J
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
92A47426
Funding Number(s)
CONTRACT_GRANT: NAG5-1930
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available