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Observations indicate that over the past several decades, geomorphic processes in the Arctic have been changing or intensifying. Coastal erosion, which currently supplies most of the sediment and carbon to the Arctic Ocean [Rachold et al., 2000], may have doubled since 1955 [Mars and Houseknecht, 2007]. Further inland, expansion of channel networks [Toniolo et al., 2009] and increased river bank erosion [Costard et al., 2007] have been attributed to warming. Lakes, ponds, and wetlands appear to be more dynamic, growing in some areas, shrinking in others, and changing distribution across lowland regions [e.g., Smith et al., 2005]. On the Arctic coastal plain, recent degradation of frozen ground previously stable for thousands of years suggests 10–30% of lowland and tundra landscapes may be affected by even modest warming [Jorgenson et al., 2006]. In headwater regions, hillslope soil erosion and landslides are increasing [e.g., Gooseff et al., 2009].

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This document was originally published by American Geophysical Union in Eos. Copyright restrictions may apply. DOI: 10.1029/2010EO260001

Author Information: J. C. Rowland, Los Alamos National Laboratory, Los Alamos, N. M.; E-mail: jrowland@ lanl .gov; C. E. Jones, University of Alaska Fairbanks; G. Altmann, Los Alamos National Laboratory and University of Alaska Fairbanks; R. Bryan, University of Alaska Fairbanks; B. T. Crosby, Idaho State University, Pocatello; G. L. Geernaert, Los Alamos National Laboratory; L. D. Hinzman and D. L. Kane, University of Alaska Fairbanks; D. M. Lawrence, National Center for Atmospheric Research, Boulder, Colo.; A. Mancino, Los Alamos National Laboratory; P. Marsh, National Hydrology Research Centre, Environment Canada, Saskatoon, Saskatchewan, Canada; J. P. McNamara, Boise State University, Boise, Idaho; V. E. Romanovsky and H. Toniolo, University of Alaska Fairbanks; B. J. Travis, Los Alamos National Laboratory; E. Trochim, University of Alaska Fairbanks; and C. J. Wilson, Los Alamos National Laboratory.