Mass Balance Studies on Mccall Glacier Brooks Range, Alaska^*

* This paper has been presented at the IUGG meeting, Moscow, 1971.

Abstract

Mass balance results are given for the 1968/69 and 1969/70 hydrological years. The year was arbitrarily divided into “winter” (October 1 to April 30) and “summer” (May 1 to September 30). Balances were relatively small: mean winter balances were 152 mm (water equivalent) in 1968/69 and 221 mm in 1969 /70, and mean annual balances were -326 mm in 1968/69 and -177 mm in 1969/70. Mean annual balances of “Hanging” Glacier, a smaller glacier adjacent to McCall Glacier and within the same basin, were -168 mm in 1968/69 and 36 mm in 1969/70. Preliminary analysis shows that the mean balance of McCall for the preceding 11 years was -265 mm yr^-1 Photographic studies on two other glaciers in the Brooks Range indicate recession for the past 60 years.