Deep in the state of Sierra Nevada, enormous glaciers are disappearing and projected to dissolve completely by the start of the coming hundred years, leaving ice-free peaks for the initial occasion in human history, recent studies has discovered.
Age-Old Beginnings of Sierra Nevada Glaciers
The range's ice sheets are older than earlier understood, tracing back many thousands of years, with a few as old as the most recent glacial period, according to an article published recently.
“Our pieced-together ice age record shows that a future glacier-free Sierra Nevada is unprecedented in the history of humankind since known peopling of the Americas ~20,000 years ago,” the article states.
Global Risk to Glaciers
Glaciers globally are at risk amid the climate emergency. A study released in the month of May of this year found that almost forty percent of glaciers are destined to thaw because of global heating. If this warming increases by 2.7 degrees Celsius, which the world is currently on course for, as up to 75% will vanish, leading to sea level rise and mass displacement.
Throughout the American west, ice formations have shrunk substantially since they were first documented in the 1800s, according to the article.
Focus on Major Ice Bodies
The new research focuses on four Sierra Nevada glacial masses – the Conness, Maclure, Lyell and Palisade ice sheets – that are among the biggest and likely oldest in the range. Their durability during global heating makes them “indicators” for examining ice loss in the western region, the article notes.
Research Methods and Results
Scientists examined newly uncovered bedrock around the glaciers and collected specimens to determine how extensively the area was covered by glacial ice. They determined that the ice masses have covered large areas of the mountain system for much longer than previously known – since before humans occupied North America.
The state's glacial sheets reached their maximum positions as early as thirty thousand years ago, the study's researchers wrote, and one of the ice bodies researchers looked at is believed to have grown 7,000 years ago, earlier than once thought. The disappearance of ice formations, for the initial time in recorded history, demonstrates the dramatic effects of the climate change, a researcher of the investigation said.
Ecological and Representational Impact
“We’ll be the first to witness the ice-free peaks,” said the study's lead researcher, the study’s lead author. “This has environmental ramifications for plants and animals. And it’s a symbolic loss. Climate change is highly intangible, but these ice masses are tangible. They’re symbolic elements of the Western U.S..”
