You are browsing the archive for alaska glacier retreat Archives - Page 2 of 8 - From a Glacier's Perspective.
May 25, 2022
Lake Fork Knik River Headwater Glaciers, Alaska Retreat, Separation and Lake Expansion
Glaciers in the Lake Fork Knik River watershed in 1986 and 2021 Landsat images. LG=Lake George Glacier and WO=Whiteout Glacier with the remainder unnamed, labelled here as W=West, NW=Northwest and SE=Southeast. Red arrows mark 1986 terminus locations and yellow dots the 2021 terminus locations. At the headwaters of the Lake Fork of the Knik River are a series of glaciers undergoing retreat and separation. The headwaters is dominated by the …
April 26, 2022
East Twin Glacier Retreats from Twin Lake with Developing Icefield Disconnection
East Twin Glacier in Sentinel 2 images from 2017, 2019 and 2021. Point A marks the threshold, B the terminus contact with lake in 2017, Point 1 is the first ogive above the terminus. East Twin Glacier is a narrow valley outlet glacier from the Juneau Icefield. The glacier descends from the icefield through an icefall at 975 m- 600 m that generate ogives at the icefall base. The extensive …
November 14, 2021
Field Glacier, Alaska Retreat, Separation and Rapid Lake Development 1984-2021
Field Glacier on Aug. 31, 2021 in a Sentinel image. Note former glacier junctions A and B where the glacier has separated this century. The 7.5 km2 lake did not exist when I first visited this glacier. The Field Glacier flows from the northwest side of the Juneau Icefield, and is named for Alaskan glaciologist and American Geographical Society leader William O. Field. Bill along with his work around Glacier …
July 21, 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 …
July 15, 2021
Sheridan Glacier, Alaska Retreat Causes Rapid Lake Expansion
Sheridan Glacier in 2002 and 2020 Landsat images illustrating retreat of the margin and expansion of the lake. Red arrow is 2002 margin on small island, yellow arrow is 2020 terminus location just north of Sherman Glacier stream and purple dots are the snowline. Sheridan Glacier in the Chugach Mountains of Alaska begins at 1500 m and flow southwest out of the mountains with the terminus spreading out in a …
June 17, 2021
Dawes Glacier, Alaska Retreat Driven Separation
Dawes Glacier retreat in 1985 and 2020 Landsat images. Red arrow 1985 terminus, yellow arrow 2020 terminus. Point 1-3 are tributaries joining the main glacier. The glacier is about to separate into two calving termini. Dawes Glacier terminates at the head of Endicott Arm in the Tracy Arm-Fords Terror Wilderness of southeast Alaska. Endicott Arm is a fjord that has been extending with glacier retreat, and is now 58 km …
May 31, 2021
Valdez Glacier, Alaska Significant Calving Retreat in 2020
Valdez Glacier terminus in Sentinel images from 6-27-2020, 8-21-2020 and 5-23-2021. In June the glacier’s terminus area is poised to collapse with extensive rifting and marginal proglacial lakes along the east and west margins. In July the terminus breaks up and in August the lake is filled by a flotilla of icebergs. The May image indicates the icebergs are still present. Valdez Glacier is an outlet glacier from the Chugach …
April 21, 2021
Geikie Glacier, Alaska Lofty No More
Geikie Glacier (G) in 1986 and 2018 Landsat images. Pink arrow is the 1954 terminus, red arrow the 1986 terminus and yellow arrow the 2018 terminus location. GI is Geikie Inlet which the glacier withdrew from 110 years ago. Geikie Glacier is on the west side of Glacier Bay, Alaska. John Muir in October 1879 observed Geikie Glacier in Geikie Inlet, which had separated from Muir Glacier within the …
March 2, 2021
Nellie Juan Glacier Loses Contact with Contact Glacier, Alaska
Nellie Juan Glacier (NJ) and Contact Glacier (C) in 1986 and 2020 Landsat images. Red arrow is the 1986 terminus location of both glaciers. Yellow arrow marks the terminus location in 2020 after glacier separation and purple dots mark the upper limit of Contact glacier at that time. Nellie Juan Glacier is a tidewater outlet glacier of the Sargent Icefield, Alaska. Just after 1935 the glacier retreated from moraine shoal …
January 6, 2021
Is Harlequin Lake, Alaska the fastest Growing Glacier Lake in North America this Century?
Yakutat Glacier, Alaska in 1999 and 2020 Landsat image illustrating expansion of Harlequin Lake by 40.5 km². Yellow line is the 1999 margin, orange line is the 2020 margin, and yellow dots indicate the margin of the lake shoreline. Point A indicates the 1987 terminus location, Point X and Y the 1999 terminus location. Main terminus now extends south near Point C. Northern terminus extends west from Point B. Yakutat …
Dean of Academic Affairs at Nichols College and Professor of Environmental Science at Nichols College in Massachusetts since 1989. Glaciologist directing the North Cascade Glacier Climate Project since 1984. This project monitors the mass balance and behavior of more glaciers than any other in North America.