Rapid viscoelastic uplift in southeast Alaska caused by post-Little Ice Age glacial retreat

被引：185

作者：

Larsen, CF ^{[1
]}

Motyka, RJ ^{[1
]}

Freymueller, JT ^{[1
]}

Echelmeyer, KA ^{[1
]}

Ivins, ER ^{[1
]}

机构：

[1] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2005年 / 237卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

glacier rebound; glacial isostatic adjustment; Glacier Bay Alaska; glacial wastage; Little Ice Age; sea level variations; mantle viscosity;

D O I：

10.1016/j.epsl.2005.06.032

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Our observations show that extreme uplift in southeast Alaska began about 1770 AD, with relative sea level (RSL) change to 5.7 m and current uplift rates to 32 mm/yr. This region experienced widespread glacial melting following the Little Ice Age (LIA), with the collapse of the Glacier Bay Icefield alone equivalent to 8 mm of global sea level rise. Geodynamic modelling links the uplift to post-LIA isostatic rebound, with the extreme uplift signal and a priori knowledge of ice load changes requiring the presence of a low viscosity asthenosphere (3.7 X 10(18) Pa s). These crustal deformations are triggered by climate change through glacier wastage. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：548 / 560

页数：13

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