Climate change is moving mountains, research says
Terminus of the Hubbard Glacier at Resurrection Bay. The ice front is about 300 feet high. Credit: provided by UC’s Eva Enkelmann Enlarge
For millions of years global climate change has altered the structure and internal movement of mountain ranges, but the resulting glacial development and erosion can in turn change a mountain’s local climate. The degree of this cause-and-effect relationship has never been clearly observed, until now.
Based on research led by University of Cincinnati geologist Eva Enkelmann in the St. Elias Mountain Range – located along the Pacific coastal region of North America – the way a mountain range moves and behaves topographically can also change and create its local climate by redirecting wind and precipitation. The repercussions of these changes can in turn, accelerate the erosion and tectonic seismic activity of that mountain range.
Based on her findings, Enkelmann shows clear evidence for a strong relationship between global and local climate change and a mountain’s internal tectonic plate shifts and topographic changes.
Enkelmann, an assistant professor in the University of Cincinnati Department of Geology, was among several UC researchers and thousands of geoscientists from around the globe presenting their findings at the 2015 Annual Geological Society of America Meeting, Nov.1-4, in Baltimore.
This research also was published in July in the journal Geophysical Research Letters titled, “Cooperation among tectonic and surface processes in the St. Elias Range, Earth’s highest coastal mountains.”
“To understanding how mountain structures evolve through geologic time is no quick task because we are talking millions of years,” says Enkelmann. “There are two primary processes that result in the building and eroding of mountains and those processes are interacting.”
Looking at the St. Elias Mountains in particular, Enkelmann notes how dry it is in the northern part of the mountain range. But the precipitation is very high in the southern area, resulting in more erosion and material coming off the southern flanks. So as the climate change influences the erosion, that can produce a shift in the tectonics. This has been suggested in earlier studies based on numerical and analytical models, however, it had not yet been shown to have occurred over geologic times in the real world.
Enkelmann synthesized several different data sets to show how a rapid exhumation occurred in the central part of the mountain range over four to two million years ago. This feedback process between erosion and internal tectonic shifting resulted in a mass of material moving up toward the surface very rapidly.
Enkelmann’s model suggests that global climate shifts triggered a change in the rheology—the way material behaves.
While the Earth was much warmer millions of years ago, glaciers still existed in the high altitudes. However, 2.6 million years ago the Earth experienced a shift to a colder climate and glaciation intensified. Existing glaciers grew larger, froze solid, covered the area and did not move.
Enkelmann says the glaciers today are wet-based and are moving, very aggressively eroding material around and out, and in the case of her observation, into the Gulf of Alaska. The tectonic forces (internal plates moving toward one another) continue to move toward Alaska, get pushed underneath and the sediment on top is piling up above the Yakutat plate.
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Adding to the already complex effects of climate change, these processes essentially work against each other.