A detailed “body scan” of Malaspina Glacier, one of Alaska’s most iconic glaciers, revealed that its bulk lies below sea level and is undercut by channels that may allow ocean water to gain access, making it likely to retreat faster than previously thought, according to a new study published in JGR Earth Surface. This makes the glacier more vulnerable to seawater intrusion than previously thought and may cause it to retreat faster than predicted.
The findings, published by University of Arizona researchers in the Journal of Geophysical Research, underscore the fragility of a very large glacial system that could lead to the loss of a significant volume of ice and National Park Service land and would contribute a measurable volume to global sea level rise.
The loss of this glacier would likely be the largest loss of ice from an Alaskan glacier within this century.Brandon Tober, doctoral student in the University of Arizona
The area in front of Malaspina Glacier, a permafrost zone with pure ice beneath the surface, is “wasting away” in the face of rising global temperatures, Brandon Tober a doctoral student in the UArizona Department of Geosciences said. Permafrost refers to ground that remains frozen for two or more years.
“As this coastal barrier erodes and gives way to large lagoons, primarily through the collapse of ice cliffs, ocean water may eventually gain access to the glacier,” Tober said. “Once it gets to the front of the glacier, it may melt the ice even faster and initiate the glacier’s retreat.”
Forming an expansive ice sheet located right on the shore of southeast Alaska, Malaspina is the world’s largest piedmont glacier, a type of glacier that flows from steep mountains onto a broad plain, essentially forming a “pancake of ice” that spills out onto a broad coastal plain from the St. Elias Mountains. A thin land barrier separates the glacier from the relatively warm waters of the Gulf of Alaska. Historical satellite imagery shows these water bodies expanding over time, forming a lagoon system directly in front of the glacier over the past few decades.
Traditionally, researchers rely on mathematical models to gauge the thickness of glaciers, Tober said, but they vary widely in their ability to accurately predict the thickness of glaciers. These models often rely on measurements of how fast the glacier moves across the surface to make predictions about the glacier’s depth, similar to the way a river’s water flow rates are used to gain insights about its depth and the shape of its bed.
To gain a better idea of Malaspina’s future, the researchers needed to get a detailed “body scan” of its shape and thickness. To do this, Tober’s research group used the Arizona Radio Echo Sounder, or ARES, an instrument designed and built by a team led by Jack Holt, a professor at the UArizona Lunar and Planetary Laboratory and Department of Geosciences, and one of the paper’s co-authors. Holt’s research group specializes in using geophysical research methods, primarily radar, to study features on Earth and Mars.
We know that glaciers in Alaska are melting in many places, but we don’t accurately know how thick they are.Brandon Tober, doctoral student in the UArizona Department
ARES was mounted in an airplane as part of Operation IceBridge, a NASA-funded mission tasked with measuring annual changes in the thickness of glaciers, sea ice and ice sheets in Greenland, Alaska and Antarctica from airplanes between 2009 and 2021.
While the plane crisscrossed the vast, icy expanse, its ice-penetrating radar “X-rayed” the glacier, resulting in a full “3D body scan” of the glacier and underlying bedrock. The measurements revealed that Malaspina glacier sits largely below sea level and is cut by several channels at its bed that extend at least 21 miles from where the glacier meets the shore up toward its source in the Saint Elias Mountains.
The combination of the glacier’s location with respect to the sea level and the continued loss of its coastal barrier may provide pathways for ocean waters to access large areas of the glacier’s bed along these channels, the researchers write in their paper. Assuming this leads to large-scale shedding of ice masses and the glacier’s retreat, the researchers conclude that Malaspina has the potential to contribute 560 cubic kilometers, or 134 cubic miles, of ice to the ocean. Malaspina alone could raise global sea level by 1.4 millimeters, or just under 1/16 of an inch.
“This might not sound like much, but to put this in perspective, all Alaskan glaciers combined contribute about 0.2 millimeters per year to global sea level rise – a rate that tops all other glaciated regions on Earth apart from the Greenland and Antarctic ice sheets,” Tober said.
The study makes Malaspina the most extensively radar-mapped glacier in Alaska, according to Tober’s team. While glaciers in other parts of the world have been mapped to similar levels of detail, their Alaskan counterparts have eluded accurate measurements because they consist of what is known as temperate or “warm” ice.
The observed expanse of lagoons across Malaspina’s foreland over the past few decades is largely what alerted a team of researchers including Holt to the fact that the coastal barrier in front of Malaspina Glacier is wasting away, raising questions about the glacier’s stability. The team, which consists of researchers from the UArizona, the University of Alaska Fairbanks, the University of Montana and the National Park Service, was awarded a grant by the National Science Foundation to further investigate the potential demise of the world’s largest piedmont glacier.