mountains and water in glacier national park;

today’s theme is the beautiful mountains and waterways in glacier national park.

via wikipedia.org:
Glacier National Park is dominated by mountains which were carved into their present shapes by the huge glaciers of the last ice age; these glaciers have largely disappeared over the 15,000 years. Evidence of widespread glacial action is found throughout the park in the form of U-shaped valleys, glacial cirques, aretes and large outflow lakes radiating like fingers from the base of the highest peaks. Since the end of the ice ages, various warming and cooling trends have occurred. The last recent cooling trend was during the Little Ice Age which took place approximately between 1550 and 1850. During the Little Ice Age, the glaciers in the park expanded and advanced, although to nowhere near as great an extent as they had during the Ice Age. Coincidentally, the park region was first explored in detail near the end of the Little Ice Age and a systematized survey began in which the number and size of glaciers was documented on maps and by photographic evidence. Much of this late 19th century work, however, was undertaken to lure tourism into the region or to search for mineral wealth, not out of a particular desire to document glaciers.During the middle of the 20th century, examination of the maps and photographs from the previous century provided clear evidence that the 150 glaciers known to have existed in the park a hundred years earlier had greatly retreated, and in many cases disappeared altogether. Repeat photography of the glaciers, such as the pictures taken of Grinnell Glacier between 1938 and 2005 as shown, help to provide visual confirmation of the extent of glacier retreat.

1938 1981 1998 2005

In the 1980’s, the U.S. Geological Survey began a more systematic study of the remaining glaciers, which continues to the present day. By 2005, only 27 glaciers remained, and scientists generally agree that if the current greenhouse warming continues, all the glaciers in the park will be gone by 2030.

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