Deep in California’s Sierra mountain range, enormous ice formations are vanishing and expected to dissolve completely by the beginning of the coming hundred years, resulting in ice-free peaks for the initial occasion in human history, new research has found.
Ancient Origins of Sierra Range Ice Masses
The mountain range’s glaciers are more ancient than previously known, dating back tens of thousands of years, with some as old as the last ice age, according to an article released last week.
“Our reconstructed ice age record shows that a future glacier-free Sierra Nevada is without precedent in human history since documented peopling of the Americas around twenty thousand years ago,” the article declares.
Global Risk to Ice Formations
Ice masses globally are at risk during the climate emergency. A research released in the month of May of this year determined that almost forty percent of ice sheets are doomed to thaw because of climate warming. If this warming increases by 2.7C, which the world is currently on track for, as many as seventy-five percent will disappear, causing sea level rise and large-scale relocation.
Across the American west, glaciers have shrunk significantly since they were first documented in the late 19th century, according to the article.
Concentration on Key Glaciers
The new research focuses on four Sierra Nevada glacial masses – the Palisade, Lyell, Maclure and Conness ice sheets – that are some of the biggest and probably most ancient in the range. Their longevity during global heating makes them “indicators” for examining ice loss in the western region, the study notes.
Research Methods and Results
Scientists looked at newly uncovered bedrock around the glaciers and took samples to determine how extensively the region was blanketed by glacial ice. They found that the ice masses have covered swaths of the mountain system for much longer than previously known – since prior to people occupied North America.
The state's glaciers reached their maximum positions as early as 30,000 years ago, the article’s authors wrote, and a particular of the ice bodies researchers looked at is believed to have expanded 7,000 years ago, earlier than once thought. The disappearance of ice formations, for the initial time in human history, shows the dramatic impacts of the climate change, one author of the investigation said.
Environmental and Representational Impact
“We’ll be the first to witness the ice-free peaks,” said the study's lead researcher, the principal investigator. “This has environmental implications for plants and animals. And it’s a representational decline. Global warming is very abstract, but these ice masses are concrete. They’re iconic features of the American West.”
