New inferences of mantle viscosity from joint inversion of long-wavelength mantle convection and post-glacial rebound data
New inferences of mantle viscosity from joint inversion of long-wavelength mantle convection and post-glacial rebound data
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DOI：
10.1029/96gl00964
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发表时间：
1996-05-15
影响因子：
5.2
通讯作者：
Mitrovica, JX
中科院分区：
文献类型：
--
作者：
Forte, AM;Mitrovica, JX
我们对与地幔对流和冰川均衡调整(GIA)有关的地球物理观测资料进行了联合反演。我们的数据包括与哈德逊湾和芬诺斯坎迪亚冰后相对海平面(RSL)变化相关的非静力大地水准面系数(高达8度)和衰变时间。我们发现，这两个数据集可以使用单一的地幔粘度剖面进行协调，该剖面的特征是整个地区随着深度的显著增加。这一结果削弱了先前关于地幔流变学具有显著的瞬时效应的论点。我们得到的粘性廓线与哈德逊湾上空观测到的自由空气重力异常相吻合。
We perform joint inversions for mantle viscosity of geophysical observables associated with both mantle convection and glacial isostatic adjustment (GIA). Our data include coefficients of the nonhydrostatic geoid (up to degree 8) and decay times associated with post-glacial relative sea level (RSL) variations in Hudson Bay and Fennoscandia. We find that both data sets may be reconciled using a single profile of mantle viscosity which is characterized by a significant increase, with depth, across this region. This result weakens previous arguments that the mantle rheology has significant transient effects. The viscosity profiles we obtain are found to reconcile the observed free air gravity anomaly over Hudson Bay.