21st-Century Evolution of Greenland Outlet Glacier Velocities

Edited: 2012-05-16
Title21st-Century Evolution of Greenland Outlet Glacier Velocities
Publication TypeJournal Article
Year of Publication2012
AuthorsMoon, T., I. Joughin, B. Smith, and I. Howat
JournalScience
Volume336
Issue6081
Pagination576 - 578
Date Published05/2012
ISSN1095-9203
Keywordsclimate, ice, sea_level
AbstractEarlier observations on several of Greenland’s outlet glaciers, starting near the turn of the 21st century, indicated rapid (annual-scale) and large (>100%) increases in glacier velocity. Combining data from several satellites, we produce a decade-long (2000 to 2010) record documenting the ongoing velocity evolution of nearly all (200+) of Greenland’s major outlet glaciers, revealing complex spatial and temporal patterns. Changes on fast-flow marine-terminating glaciers contrast with steady velocities on ice-shelf–terminating glaciers and slow speeds on land-terminating glaciers. Regionally, glaciers in the northwest accelerated steadily, with more variability in the southeast and relatively steady flow elsewhere. Intraregional variability shows a complex response to regional and local forcing. Observed acceleration indicates that sea level rise from Greenland may fall well below proposed upper bounds.
DOI10.1126/science.1219985
Short TitleScience