CU Boulder study finds disproportionate effects of temperature shifts on an icy glacier layer.
CU Boulder study finds disproportionate effects of temperature shifts on an icy glacier layer.
Scientists have known from ice core research that it's easier to melt an ice sheet than to freeze it up again. Now, they know at least part of the reason why, and it has to do with ice's "sponginess," according to a new study published today in The Cryosphere.
The study uses a physics-based numerical model to assess the impacts of warming and cooling on firn, the porous layer between snow and glacial ice, over the entire Greenland Ice Sheet. Megan Thompson-Munson, a CIRES and ATOC PhD student, led the study alongside her advisors: CIRES Fellow Jen Kay and INSTAAR Fellow Brad Markle.
"The amount of change that occurs within the firn layer due to warming and cooling is not equal in magnitude,” Megan Thompson-Munson said. “If we look at thousands or millions of years, we see asymmetric ice sheet behavior overall: Ice sheets can melt away quickly, but take a long time to grow. This firn asymmetry we identify is a small piece of that puzzle."
Read more at University of Colorado at Boulder
Photo Credit: LH985 via Pixabay
