Similarity of organized patterns in driving and basal stresses of Antarctic and Greenland ice sheets beneath extensive areas of basal sliding ...

• Main Authors: Sergienko, O. V., Creyts, Timothy T., Hindmarsh, R. C. A.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Columbia University 2014
• Subjects: Ice mechanics; Ice sheets; Geophysics; FOS: Earth and related environmental sciences; Physical geography; Antarctic; Greenland; The Antarctic; Antarc*
• Online Access: https://dx.doi.org/10.7916/d85x28cw; https://academiccommons.columbia.edu/doi/10.7916/D85X28CW

The rate of ice transport from the interior of ice sheets to their margins, and hence the rate with which it contributes to sea level, is determined by the balance of driving stress, basal resistance, and ice internal deformation. Using recent high-resolution observations of the Antarctic and Greenland ice sheets, we compute driving stress and ice deformation velocities, inferring basal traction by inverse techniques. The results reveal broad-scale organization in 5–20 km band-like patterns in both the driving and basal shear stresses located in zones with substantial basal sliding. Both ice sheets experience basal sliding over areas substantially larger than previously recognized. The likely cause of the spatial patterns is the development of a band-like structure in the basal shear stress distribution that is the results of pattern-forming instabilities related to subglacial water. The similarity of patterns on the Greenland and Antarctic ice sheets suggests that the flow of ice sheets is controlled by the ...