DOI: 10.1016/j.tecto.2020.228428
论文题名: Upper mantle density and surface gravity change in Fennoscandia, determined from GRACE monthly data
作者: Sjöberg L.E. ; Bagherbandi M.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 782-783 语种: 英语
中文关键词: Fennoscandia
; Glacial isostatic adjustment
; Gravity change
; Mantle density
; Postglacial rebound
英文关键词: Geodetic satellites
; Gravimeters
; Mass transfer
; Absolute gravimeter
; Earth structures
; Glacial isostatic adjustment
; Gravity measurement
; Satellite gravity
; Satellite mission
; Surface gravity
; Temporal change
; Gravitation
; GRACE
; gravimetry
; satellite data
; satellite mission
; temporal variation
; uplift
; upper mantle
; Fennoscandia
英文摘要: Precise gravity measurements have been repeatedly observed in Fennoscandia since the 1960-ties, first by relative gravimeters, then by absolute gravimeters, for studying the temporal change of gravity related with the on-going glacial isostatic adjustment (GIA). The results of such studies are vital for understanding GIA processes and tuning GIA and Earth structure models. This study uses monthly repeated data from the twin satellite mission GRACE for 164 months between 2003 and 2016 for estimating the temporal change of surface gravity, its ratio (f) to the land uplift rate as well as the upper mantle density related with the viscous mass flow in the mantle. The maximum negative change of gravity is estimated to −1.8 μGal/yr, and f is estimated to −0.172 ± 0.018 μGal/mm. The solutions for f from the three independent techniques (relative, absolute and satellite gravity observations) were found to agree statistically without significant biases, and they were merged in a joint solution to −0.166 ± 0.004 μGal/mm, corresponding to a mean upper mantle mass flow density of 3402.5 ± 95 kg/m3, which decreases towards the uplift center. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170715
Appears in Collections: 气候变化与战略
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作者单位: Faculty of Engineering and Sustainable Development, University of Gävle, Gävle, SE-80176, Sweden; Division of Geodesy and Satellite Positioning, Royal Institute of Technology (KTH), Stockholm, SE-10044, Sweden
Recommended Citation:
Sjöberg L.E.,Bagherbandi M.. Upper mantle density and surface gravity change in Fennoscandia, determined from GRACE monthly data[J]. Tectonophysics,2020-01-01,782-783