Glacier recession observed through repeat photography
Repeat photography is a powerful observational tool for understanding the impacts of climate change. Here, the Arapaho Glacier, the largest on the Colorado Front Range, has experienced a significant loss in its mass balance in less than a century, as evidenced by W.I. Hutchinson’s photograph captured in 1917, and my recapture of the same scene in 2004. Geologically, this is no longer a glacier because it is only recessional, meaning it is receding in most years. This perennial snowfield is an important part of the Boulder, Colorado watershed.