21st-Century Evolution of Greenland Outlet Glacier Velocities

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Science  04 May 2012:
Vol. 336, Issue 6081, pp. 576-578
DOI: 10.1126/science.1219985

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  1. Fig. 1

    Outlet glacier categories and rates of velocity change (percentage change from beginning of 5-year period). Black-outlined images show 2000 to 2005 results, and red-outlined images are 2005 to 2010 results. The background velocity map for both periods is a 2007 to 2010 composite, with the five ice-sheet regions indicated: north (N), northwest (NW), southwest (SW), southeast (SE), and east (E). There was no change for the north during 2005 to 2010. Jakobshavn (J), Upernavik North (U), Helheim (H), Kangerdlugssuaq (K), and Ikeq Fjord (I) glaciers are indicated.

  2. Fig. 2

    Bottom: Distribution of glacier speeds (short ticks), smoothed speed density (colored bars), and mean speeds (long ticks) for 7 years’ data. The northwest region is shown in blue with blue tick marks (left side) and the southeast region in gray with red tick marks (right side). Dashed black lines indicate regional mean speed over the entire decade (top for southeast, bottom for northwest). Only glaciers with sufficient data for both 2000 to 2005 and 2005 to 2010 are included. Top: Velocity plots for Jakobshavn (Jako), Upernavik North (Unor), Kangerdlugssuaq (Kang), Helheim (Helh), and Ikeq Fjord (Ikeq).