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November 21, 2017

Bridge Glacier, Southeast Alaska Retreat & Lake Formation

Bridge Glacier in Landsat image from 1984 and Sentinel image from 2017. The red arrow indicates the 1984 terminus where no lake exists, yellow arrow is 2017 terminus, orange arrows are selected tributaries and purple dots the snowline.  Bridge Glacier drains the same icefield as the Wright and Speel Glacier 45 km southeast of Juneau, Alaska. Here we examine the changes in this glacier from 1984-2017 using Landsat and Sentinel imagery. In 1984 the …


July 13, 2017

Gabriel Quiroz Glacier, Chile Retreat Forms New Lake

Gabriel Quiroz Glacier, Chile in 1987 and 2016 Landsat images illustrates the retreat.  Red arrow is 1987 terminus, yellow arrow the 2016 terminus, purple arrow a retreating northern tributary and purpe dots the snowline. Gabriel Quiroz Glacier is a northern outlet glacier of the Southern Patagonia Icefield that drains into the Rio Pascua.  The glacier in 1987 terminated within 250 m of Lago Gabriel Quiroz.  Willis et al (2012) observed that between February 2000 …


October 1, 2015

Palma Glacier, Alaska Retreat Opens Lake Passage

An August 1986 and September 2015 Landsat Image of Palma Glacier, 1986 terminus yellow arrow. Palma Glacier is an unnamed glacier just west of Brady Glacier and Glacier Bay that is the principal glacier draining into Palma Bay.  Here we examined the changes in this glacier from 1986 to 2015 with Landsat Imagery.  The glacier has terminated in a lake at the head of a river draining into Palma Bay at …