Postglacial isostatic adjustment in a self-gravitating spherical earth with power-law rheology

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	Postglacial isostatic adjustment in a self-gravitating spherical earth with power-law rheology
	Wu, Patrick ; Wang, Hansheng
刊名	Journal of Geodynamics
	2008
期号	3-5 页码:118-130
中文摘要	Since microphysics cannot say definitively whether the rheology of the mantle is linear or non-linear, the aim of this paper is to constrain mantle reology from observations related to the glacial isostatic adjustment (GIA) process-namely relative sea-levels (RSLs), land uplift rate from GPS and gravity-rate-of-change from GRACE. We consider three earth model types that can have power-law rheology (n = 3 or 4) in the upper mantle, the lower mantle or throughout the mantle. For each model type, a range of A parameter in the creep law will be explored and the predicted GIA responses will be compared to the observations to see which value of A has the potential to explain all the data simultaneously. The coupled Laplace finite element (CLFE) method is used to Calculate the response of a 3D spherical self-gravitating viscoelastic Earth to forcing by the ICE-4G ice history model with ocean loads in self-gravitating oceans. Results show that ice thickness in Laurentide needs to increase significantly or delayed by 2 ka, otherwise the predicted uplift rate, gravity rate-of-change and the amplitude of the RSL for sites inside the ice margin of Laurentide are too low to be able to explain the observations. However, the ice thickness elsewhere outside Laurentide needs to be slightly modified in order to explain the global RSL data outside Laurentide. If the ice model is modified in this way, then the results of this paper indicate that models with power-law theology in the lower mantle (with A similar to 10(-35) pa(-3) S-1 for n = 3) have the highest potential to simultaneously explain all the observed RSL, uplift rate and gravity rate-of-change data than the other model types. (C) 2008 Elsevier Ltd. All rights reserved.
原文出处	://WOS:000260360800006
公开日期	2012-04-11
内容类型	期刊论文
源URL	[http://ir.whigg.ac.cn/handle/342008/3364]
专题	测量与地球物理研究所_其他_期刊论文
推荐引用方式 GB/T 7714	Wu, Patrick,Wang, Hansheng. Postglacial isostatic adjustment in a self-gravitating spherical earth with power-law rheology[J]. Journal of Geodynamics,2008(3-5):118-130.
APA	Wu, Patrick,&Wang, Hansheng.(2008).Postglacial isostatic adjustment in a self-gravitating spherical earth with power-law rheology.Journal of Geodynamics(3-5),118-130.
MLA	Wu, Patrick,et al."Postglacial isostatic adjustment in a self-gravitating spherical earth with power-law rheology".Journal of Geodynamics .3-5(2008):118-130.