Narrow stripes of dirt and rock beneath massive Antarctic glaciers create friction zones that slow the flow of ice toward the sea.
Understanding how these high-friction regions form and subside could clarify how the flow of these glaciers responds to a warming climate, researchers say.
Just as no-slip strips prevent people from slipping on a wet floor, these ribs or “tiger stripes” provide friction that hinders the glaciers from slipping along the underlying bed of rock and sediment.
Scientists discovered the stripes, which occur in large, slippery regions under the glaciers, by using mathematical modeling based on data from the National Snow and Ice Data Center and the British Antarctic Survey.
Researchers would like to understand what factors determine the flow of glaciers, which are massive, moving ice sheets that, when they flow into the ocean, can contribute substantially to sea-level rise.
For the study, published in Science, researchers studied two glaciers, the Pine Island Glacier and the Thwaites Glacier in West Antarctica, which together contribute about 10 percent of the observed sea-level rise over the past 20 years, despite their small areas. The Pine Island Glacier moves at a velocity of about 1.5 miles per year.
Studying the bottom of these glaciers is next to impossible due to the inability to see through the ice, which is over a mile-and-a-half thick. Instead, the researchers used satellite measurements of the ice velocity and ground-penetrating radar collected from airplane flyovers to detect bedrock and surface topography, as well as field observations.
Friction decides glacier speed
Using the data, they created a mathematical model that calculated what happens inside the glacier as it flows along the bedrock. The model predicted the formation of the tiger stripes or ribs.
The friction at the interface of the bedrock and glacier ice is a major factor in the speed of a glacier, says Olga Sergienko, associate research scientist in Princeton University’s Program in Atmospheric and Oceanic Sciences.
When friction is high, the glacier moves slowly. When friction is low, as when melting ice provides a liquid layer that allows the ice to slide over the bedrock, the glacier moves more quickly.
Rise and decay
The tiger stripes, which the researchers also call ribs due to their slightly curved structure, lie at roughly 30-degree angles to the direction of the glacier’s movement. These ribs arise and decay in response to natural processes over roughly 50 to 100 years, according to the researchers’ calculations.
The process is strongly affected by how water, which comes from ice melting due to the inherent heat trapped in the Earth, infiltrates the space between the ice sheet and the bedrock, the researchers say.
“The ribs may play an important role in buffering the effects of a warming climate, since they slow the movement of ice that reaches the ocean and contributes to sea-level rise,” Sergienko says.
“These changes can happen independently of climate change, too.”
More investigations are needed to verify models of rib formation.
“Our guess is that these ribs are related to typical landforms that exist in the formerly glaciated areas of North America and Europe,” says Richard Hindmarsh, a scientist at the British Antarctic Survey. “A great example are the drumlins—raised areas of soil and rock—that make the hills in Seattle or Glasgow.”
The study reveals new patterns of friction that help control the speed of ice flow and determine the effect of Antarctic ice on sea level, says Douglas MacAyeal, a professor of glaciology at the University of Chicago who was not involved in the work.
“This is strongly suggestive of a new style of physical controls over friction, like water flow in the thin zone between the rock of the bed and the ice,” he says. “The results of this study will drive new theoretical and observational efforts to understand what causes this pattern.”
The National Science Foundation and the British Antarctic Survey Polar Science for Planet Earth program supported the research.
Source: Princeton University