Velocity pattern in a transect across ice stream B, Antarctica

I. M. Whillans, M. Jackson, Y. H. Tseng

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Repeat aerial photography is used to obtain closely spaced measurements of velocity and elevation over a complex transect of Ice Stream tributary B2, including the shear margins, the fast ice of the ice stream and several unusual features, as well as the UpB camp. Persistent features, mainly crevasses, are tracked to provide 1541 values of velocity and 1933 values of elevation. These are used to describe ice flow in the ice stream. Within the ice stream, the dominant velocity gradient is lateral shear. Crevasse patterns are studied in relation to measured velocity gradients. Crevasses intersect one another at acute angles, indicating that their origin is deeper than the depth to which crevasses penetrate. One feature within the ice stream seems to be a raft of still ice. Others are crevasse trains. Also, there are spreading ridges, perhaps due to upwelling ice. There is no evidence of large sticky spots within the studied transect, i.e., no steep surface slopes with associated surface stretching just up-glacier and surface compression down-glacier. -Authors

Original languageEnglish
Pages (from-to)562-572
Number of pages11
JournalJournal of Glaciology
Volume39
Issue number133
DOIs
Publication statusPublished - 1993 Jan 1

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes

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