Sheridan and Sherman Glaciers, Chugach Mtns.. South Sawyer Glacier- 1999.

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Presentation transcript:

Sheridan and Sherman Glaciers, Chugach Mtns.

South Sawyer Glacier- 1999

SOUTHEAST ALASKA ICE VEGETATION ROCK/SOIL

Landsat Thematic Mapper (TM) bands

redgreenblue computer display: Landsat Thematic Mapper (TM) bands near infrared thermal infrared

SOUTHEAST ALASKA ICE VEGETATION ROCK/SOIL Juneau Icefield

Digital elevation model (DEM) sea level meters

Landsat Thematic Mapper image superimposed on digital elevation model Juneau Icefield

Region of the Mendenhall Glacier

Mendenhall Glacier

Recent glacier retreat

calving terminus South Sawyer Glacier trim line- 1988

snowline last winter’s snow: accumulation zone melting ice: ablation zone Lemon Creek Glacier

Juneau Icefield Region of the Taku Glacier

Taku Glacier

ablation zone Taku Glacier accumulation zone

terminus outwash terminus of Taku Glacier

Juneau Icefield Region of the Gilkey Glacier

Gilkey Glacier Vaughn Lewis Icefall

Clouds and cloud shadows ogives

Vaughn Lewis ice fall ogives

Vaughn Lewis icefall Un-named glacier tributary to Gilkey

Vaughn Lewis icefall: severe extensional deformation producing open cracks, increasing surface area

medial moraines ogives

Looking down the Gilkey Glacier

enhanced TM image of ogives

tent

hanging glaciers valley glacier

terminus cirque glacier

cirque hanging glacier arete ridge horn ogive

Childs Glacier, calving into Copper River

snowlines terminus Earthquake triggered Rockfall covering terminus of glacier Sheridan and Sherman Glaciers, Chugach Mtns. pro-glacial lake

SOUTHEAST ALASKA ICE VEGETATION ROCK/SOIL Glacier Bay

Record of Glacier Bay Terminus Changes 1986 Landsat MSS image 10 km