Climate change is causing the world’s glaciers to melt. The world’s biggest glaciers, once frosted over and cold, are becoming green wonderlands as the Earth’s atmosphere becomes more habitable to plant life in places where it would have previously been impossible. The National Ocean and Atmospheric Administration posted on Climate.gov that 2023 was the 36th year in a row when the world’s glaciers lost mass rather than gaining or maintaining it . While glaciers, which are typically not overly friendly to human habitation, might not sound important to civilization, they serve a crucial purpose in the global ecosystem. Let’s look at pictures of the world’s biggest glaciers years ago versus how they look now.
We looked at images of glaciers compiled by NOAA and published on their Climate.gov website to populate this list. To ensure we understood the implications of the images, we researched the loss of glacier mass. We also looked at statistics and studies around the loss of glacier mass to determine the cause of the problem as scientists currently understand it. Additionally, we researched the history of the glaciers we mentioned to gain a full understanding of the glaciers themselves.
Pedersen Glacier
The Pedersen Glacier is in the Kenai Fjords National Park in Alaska. The park encompasses the glacier, Pedersen Lagoon, and Pedersen Spit. It is a 1,700-acre nature sanctuary where visitors can enjoy and see the beautiful sights. In the 20th century, the Pedersen Glacier was quite large. The ice formations of the glacier reached the edge of the lake and obscured Pedersen Spit from the naked eye entirely. However, in modern days, the glacier has retreated greatly. The area around the lake is no longer a frozen wonderland. Instead, the glacier has melted into the lake and the ice no longer reaches the edge.
The area around the glacier was once frosted over. It is now habitable to plant life that would have previously died if it tried to grow there. The retreat glacier revealed the sedimentary rock underneath the frost and the park is now home to a small grassland.
The national park is still taking visitors. Potential visitors have many options for how they can get to the park. It is open to foot traffic but more well-to-do visitors can visit by cruise! Even though the glacier may not be as impressive as it was during the 20th century, it is still quite beautiful!
Muir Glacier
The Muir Glacier in southeastern Alaska. Visitors can find this glacier in the Glacier Bay National Park and Preserve. It is named after the Scottish explorer John Muir who traveled around the area and wrote about the glacier, generating early interest in the location. His first two visits to the glacier were in 1879 and he wrote about the experience in the San Fransisco Bulletin. He would later collect these writings and create a compendium out of them known as Travels in Alaska. The book was published in 1915, one year after he passed.
Muir Glacier’s retreat has been rapid and well-documented throughout the years. It reached its maximum mass during the Little Ice Age in the late 1700s. In 1794, explorer Captain George Vancouver documented the size of the glacier. At the time, a sheet of ice covered most of Glacier Bay. He documented the size of the ice sheet as being over 3,900 feet in size.
Since then, the glacier has retreated significantly. From 1892 to 1980 the glacier retreated over 20 miles, losing a large amount of its mass. Between 1941 and 2004, the glacier retreated 7.5 miles and became 800 feet thinner. The retreat of the glacier caused ocean water to flood the valley it is located in. The ocean water has replaced much of the ice that was once there and created the Muir Inlet.
Careser Glacier
The Giacchio del Careser in Italy is another well-documented glacier. It is an alpine glacier in the Ortles–Cevedale Group, a mountain in the Southern Rhaetian Alps in Northern Italy. The glacier’s water forms an artificial lake known as the Lake of Careser. The lake is used to provide energy using the Malga Mare plant located in the area. The glacier has experienced rapid decay and is retreating very quickly.
Careser Glacier is unique in that it is exceptionally well-documented. It is one of the most well-documented glaciers in Italy. Scientists have observed a mass loss of 1.5 meters of water per year until the most recent years when that rate increased to 2 meters per year . It doesn’t sound like a lot of water until you realize how big a glacier is. Losing that much water from such a large ice structure causes significant changes to the geometry of the structure. At the moment, the Careser Glacier is “off-balance.” Scientists estimate that if the glacier continues to retreat at the rate it is at the moment, it will disappear entirely within a few decades.
The post Mountain Glaciers Before and After: See the Difference appeared first on 24/7 Tempo .
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