“Sperry glacier in 1900 had a surface area of 840 acres. By 1938 the area had shrunk to 390 acres, and in 1946 to about 330 acres. Even more significant is the lowering of the glacier’s surface. In 1938 Sperry glacier had a thickness of 108 feet at the site of the 1946 ice margin. At this same place in 1913 the thickness was nearly 500 feet, and the average thickness of the glacier over the area from which it has since disappeared at least 300 feet. The average thickness of Grinnell glacier in 1937 at the site of the 1946 ice front was seventy-three feet. The surface of the entire glacier was lowered fifty-six feet during that 9-year period. This means that each year the glacier was reduced in volume by an amount ‘of ice equivalent to a cube 450 feet high. Thus the volume of Grinnell glacier was reduced by about one-third from September, 1937, to September, 1946.
One Is Almost Gone.
“Several other glaciers have exhibited more — phenomenal shrinkage than Sperry or Grinnell. The topographic map of Glacier National park. prepared in 1900-1902, shows several comparatively large glaciers such as Agassiz, Blackfoot and Harrison. Their shrinkage has been so pronounced that today Agassiz has virtually disappeared and the other two are pitifully small remnants”
Satellite imagery shows that the Grinnell Glacier has expanded over the past thirty years.
But the satellite deniers at Yale University say the glacier isn’t growing.