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21 July 2021

Tulsequah Glacier, BC 2021 Glacier Lake Outburst Flood

  Landsat images of Tulsequah Glacier on June 22 and July 5, 2021.  Lake No Lake is between the yellow arrows with the margin of glacier extending upvally on June 22nd. By July it has receded back to main valley and lake has largely drained. The former location of Tulsequah glacier dammed lake is at red arrow. Tulsequah Glacier, British Columbia drains east from the Juneau Icefield and is best …

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1 April 2019

Nakonake Glaciers, BC Retreat Two are Disappearing

Nakonake Glaciers in 1984 and 2018 Landsat images. Nakonake Glaciers are NW=Northwest, N=North, M=Middle, S=South, SE=Southeast.  Red arrows indicate the 1984 terminus position of the North and Middle Nakonake Glaciers.  Yellow arrows indicate the 2018 terminus location of each. Purple dots indicate the snowline and the pink arrow indicates locations of glacier separation. The Nakonake Glaciers are a group of unnamed glaciers at the headwaters of the Nakonake River in …

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4 May 2018

Tulsequah Glacier, British Columbia 2900 m retreat 1984-2017

Tulsequah Glacier in 1984 and 2017 Landsat images.  The 1984 terminus location is noted with red arrows for the main and northern distributary tongue, southern distributary red arrow indicates lake margin.  The yellow arrows indicate the 2017 glacier terminus locations. The retreat of 2900 m since 1984 led to a lake of the same size forming. Purple dots indicate the snowline. Tulsequah Glacier, British Columbia is a remote glacier draining …

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8 June 2014

Retreat of Lake No Lake Glacier Junction, Juneau Icefield, British Columbia

Lake No Lake is a glacier dammed lake that periodically drains under the retreating Tulsequah Glacier. Canadian topographic maps indicate that three glaciers coalesced to fill this valley: Tulsequah, No Lake East and No Lake West. By 1984 when I had a chance to see this lake had formed while working on Tulsequah Glacier. Here we examine the retreat of the three glaciers that has led first to lake formation …

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14 March 2010

Tulsequah Glacier, British Columbia Jokuhlaups and Retreat

Above is a paired Landsat image from 1984 left and 2013 right indicating the 2500 m retreat during this period of Tulsequah Glacier and formation of a new lake at the terminus. Tulsequah Glacier, British Columbia is a remote glacier draining from the Alaska-Canada boundary mountains of the Juneau Icefield. It is best known for its Jökulhlaups from lakes dammed by Tulsequah Glacier in northwestern British Columbia, Canada (Geertsema, 2000). …

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