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Mantle viscosity derived from geoid and different land uplift data in Greenland
KTH, School of Architecture and the Built Environment (ABE), Real Estate and Construction Management, Geodesy and Satellite Positioning. Univ Gävle, Dept Comp & Spatial Sci, Gävle, Sweden..ORCID iD: 0000-0003-0910-0596
Univ Gävle, Dept Comp & Spatial Sci, Gävle, Sweden..
China Univ Geosci, Inst Geophys & Geomatics, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan, Peoples R China.;GFZ German Res Ctr Geosci, Helmholtz Ctr Postdam, Telegrafenberg, Germany..
Shahid Rajaee Teacher Training Univ, Civil Engn Fac, Dept Geomat Engn, Tehran, Iran..
2022 (English)In: Journal of Geophysical Research - Solid Earth, ISSN 2169-9313, E-ISSN 2169-9356, Vol. 127, no 8, article id e2021JB023351Article in journal (Refereed) Published
Abstract [en]

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 x 10(22) Pa s and 7.8 x 10(21) 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.

Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2022. Vol. 127, no 8, article id e2021JB023351
Keywords [en]
glacial isostatic adjustment, mantle viscosity, spectral analysis, land uplift, GPS sites, GRACE, Greenland
National Category
Geophysics Other Earth Sciences
Identifiers
URN: urn:nbn:se:kth:diva-316725DOI: 10.1029/2021JB023351ISI: 000841308700001Scopus ID: 2-s2.0-85136902508OAI: oai:DiVA.org:kth-316725DiVA, id: diva2:1691451
Note

QC 20220830

Available from: 2022-08-30 Created: 2022-08-30 Last updated: 2025-02-01Bibliographically approved

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Bagherbandi, Mohammad

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