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

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

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005e%26psl.237..548l&link_type=abstract

Earth and Planetary Science Letters, Volume 237, Issue 3-4, p. 548-560.

Physics

31

Scientific paper

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 × 1018 Pa s). These crustal deformations are triggered by climate change through glacier wastage.

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