APL Home
APL-UW Home

Jobs
About
Campus Map
Contact
Intranet

Kristin Poinar

Research Assistant

Email

kpoinar@apl.washington.edu

Phone

206-616-9877

Department Affiliation

Polar Science Center

Publications

2000-present and while at APL-UW

Limits to future expansion of surface-melt-enhanced ice flow into the interior of western Greenland

Poinar, K., I. Joughin, S.B. Das, M.D. Behn, J.T.M. Lanaerts, and M.R. Van Den Broeke, "Limits to future expansion of surface-melt-enhanced ice flow into the interior of western Greenland," Geophys. Res. Let., 42, 1800-1807, doi:10.1002/2015GL063192, 2015.

More Info

28 Mar 2015

Moulins are important conduits for surface meltwater to reach the bed of the Greenland Ice Sheet. It has been proposed that in a warming climate, newly formed moulins associated with the inland migration of supraglacial lakes could introduce surface melt to new regions of the bed, introducing or enhancing sliding there. By examining surface strain rates, we found that the upper limit to where crevasses, and therefore moulins, are likely to form is ~1600 m. This is also roughly the elevation above which lakes do not drain completely. Thus, meltwater above this elevation will largely flow tens of kilometers through surface streams into existing moulins downstream. Furthermore, results from a thermal ice sheet model indicate that the ~1600 m crevassing limit is well below the wet-frozen basal transition (~2000 m). Together, these data sets suggest that new supraglacial lakes will have a limited effect on the inland expansion of melt-induced seasonal acceleration.

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
Close

 

Close

 

Close