Mantle Viscosity Derived From Geoid and Different Land Uplift Data in Greenland

The Earth's mass redistribution due to deglaciation and recent ice sheet melting causes changes in the Earth's gravity field and vertical land motion in Greenland. The changes are because of ongoing mass redistribution and related elastic (on a short time scale) and viscoelastic (on time s...

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Bibliographic Details
Published in:Journal of Geophysical Research: Solid Earth
Main Authors: Bagherbandi, Mohammad, Amin, Hadi, Wang, Linsong, Shirazian, Masoud
Format: Article in Journal/Newspaper
Language:English
Published: Högskolan i Gävle, Samhällsbyggnad 2022
Subjects:
glacial isostatic adjustment
mantle viscosity
spectral analysis
land uplift
GPS sites
GRACE
Greenland
Geophysics
Geofysik
Geology
Geologi
Climate Research
Klimatforskning
Other Earth and Related Environmental Sciences
Annan geovetenskap och miljövetenskap
Ice Sheet
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-39745
https://doi.org/10.1029/2021jb023351
Description
Summary:The Earth's mass redistribution due to deglaciation and recent ice sheet melting causes changes in the Earth's gravity field and vertical land motion in Greenland. The changes are because of ongoing mass redistribution and related elastic (on a short time scale) and viscoelastic (on time scales of a few thousands of years) responses. These signatures can be used to determine the mantle viscosity. In this study, we infer the mantle viscosity associated with the glacial isostatic adjustment (GIA) and long-wavelength geoid beneath the Greenland lithosphere. The viscosity is determined based on a spatio-spectral analysis of the Earth's gravity field and the land uplift rate in order to find the GIA-related gravity field. We used different land uplift data, that is, the vertical land motions obtained by the Greenland Global Positioning System (GPS) Network (GNET), gravity recovery and climate experiment (GRACE) and glacial isostatic adjustment (GIA) data, and also combined them using the Kalman filtering technique. Using different land uplift rates, one can obtain different GIA-related gravity fields. As shown in this study, the mantle viscosities of 1.9 × 1022 Pa s and 7.8 × 1021 Pa s for a depth of 200–700 km are obtained using ICE-6G (VM5a) model and the combined land uplift model, respectively, and the GIA-related gravity potential signal

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