Glacier surveys by park rangers beginning in the s provide historical data for evaluating modern changes. Both the Lyell and Maclure glaciers have been steadily retreating since they were first mapped and photographed inbut melting has accelerated rapidly in the past decade, especially during the drought that began in Repeat photography shows the glaciers melting back as well as thinning through time.
Most of this ice had melted away due to natural warming by about 10, years ago. By that time, bighorn sheep had been locally extirpated from Yosemite, primarily by disease transmission from domestic sheep.
Left Park rangers explore a crevasse in the Maclure Glacier during a s survey. In March ofbighorn sheep were reintroduced to the Mount Lyell area. Although glaciers have come and gone from Yosemite many times in the past, scientists agree that the current melting is primarily due to warmer temperatures caused by human activities.
Park naturalists and scientists have continued to regularly survey these glaciers, carrying on this legacy of science in Yosemite. Glaciers are sensitive indicators of climatic changes because their health depends on winter precipitation and summer temperatures.
Repeat photography of the Lyell Glacier showing years of ice loss. Russell top NPS photo bottom.
These ice bodies are important to local ecosystems because they provide a year-round supply of cold water to the Lyell Fork of the Tuolumne River, especially during the late summer and fall after the winter snowpack has melted.
Integrating this history of research allows park scientists to compile maps of the ice extent through time. Right Inpark rangers discovered a mummified bighorn sheep melting out of the Lyell Glacier. Glacier Research in Yosemite Scientists have explored and studied Lyell and Maclure glaciers for nearly years.
During a more recent cold period called the Little Ice Age, small glaciers formed below the highest peaks. Right The Lyell and Maclure glaciers sit at the headwaters of the Tuolumne River and are an important source of water for alpine ecosystems and hikers.(Left) The Lyell Glacier is located beneath 13, foot Mount Lyell, the highest peak in Yosemite National Park.
(Right) The Lyell and Maclure glaciers sit at the headwaters of the Tuolumne River and are an important source of. Yosemite, Through John Muir's Words. streams, lakes, glaciers, irised falls, and the forests of silver fir and silver pine. Of this glorious range the Yosemite National Park is.
Ice Age Glaciers at Yosemite National Park BY LARRY VARDIMAN, PH.D. * | SATURDAY, MARCH 01, Glaciers once filled Yosemite Valley almost to the top of Half Dome, stretching over Tuolumne Meadows and.
The Glaciers of Yosemite National Park Essay - The Glaciers of Yosemite National Park One of nature's most powerful and influential forces is also one of nature's coldest and slowest processes.
These great icy rivers are called glaciers and have formed some of the most beautiful scenery on this planet. Of this glorious range the Yosemite National Park is a central section, thirty-six miles in length and forty-eight miles in breadth.
Yosemite National Park Essay - Imagine a scenic, wild landscape with animals that roam freely, cascading waterfalls, and mountains that seem to scrape the pale blue sky. This is what one thinks when first hearing the name Yosemite National Park.Download