thumbnail

The slow advance of a calving glacier: Hubbard Glacier, Alaska, U.S.A

Annals of Glaciology

By:
, , , , and
DOI: 10.3189/172756403781816400

Links

Abstract

Hubbard Glacier is the largest tidewater glacier in North America. In contrast to most glaciers in Alaska and northwestern Canada, Hubbard Glacier thickened and advanced during the 20th century. This atypical behavior is an important example of how insensitive to climate a glacier can become during parts of the calving glacier cycle. As this glacier continues to advance, it will close the seaward entrance to 50 km long Russell Fjord and create a glacier-dammed, brackish-water lake. This paper describes measured changes in ice thickness, ice speed, terminus advance and fjord bathymetry of Hubbard Glacier, as determined from airborne laser altimetry, aerial photogrammetry, satellite imagery and bathymetric measurements. The data show that the lower regions of the glacier have thickened by as much as 83 m in the last 41 years, while the entire glacier increased in volume by 14.1 km3. Ice speeds are generally decreasing near the calving face from a high of 16.5 m d-1 in 1948 to 11.5 m d-1 in 2001. The calving terminus advanced at an average rate of about 16 m a-1 between 1895 and 1948 and accelerated to 32 m a-1 since 1948. However, since 1986, the advance of the part of the terminus in Disenchantment Bay has slowed to 28 m a-1. Bathymetric data from the lee slope of the submarine terminal moraine show that between 1978 and 1999 the moraine advanced at an average rate of 32 m a-1, which is the same as that of the calving face.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The slow advance of a calving glacier: Hubbard Glacier, Alaska, U.S.A
Series title:
Annals of Glaciology
DOI:
10.3189/172756403781816400
Volume
36
Issue:
1
Year Published:
2003
Language:
English
Publisher:
Ingenta Connect
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Annals of Glaciology
First page:
45
Last page:
50