Glacier-derived August runoff in northwest Montana
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Abstract
The second largest concentration of glaciers in the U.S. Rocky Mountains is located in Glacier National Park (GNP), Montana. The total glacier-covered area in this region decreased by ∼35% over the past 50 years, which has raised substantial concern about the loss of the water derived from glaciers during the summer. We used an innovative weather station design to collect in situ measurements on five remote glaciers, which are used to parameterize a regional glacier melt model. This model offered a first-order estimate of the summer meltwater production by glaciers. We find, during the normally dry month of August, glaciers in the region produce approximately 25 × 106 m3 of potential runoff. We then estimated the glacier runoff component in five gaged streams sourced from GNP basins containing glaciers. Glacier-melt contributions range from 5% in a basin only 0.12% glacierized to >90% in a basin 28.5% glacierized. Glacier loss would likely lead to lower discharges and warmer temperatures in streams draining basins >20% glacier-covered. Lower flows could even be expected in streams draining basins as little as 1.4% glacierized if glaciers were to disappear.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Glacier-derived August runoff in northwest Montana |
| Series title | Arctic, Antarctic, and Alpine Research |
| DOI | 10.1657/AAAR0014-033 |
| Volume | 47 |
| Issue | 1 |
| Year Published | 2015 |
| Language | English |
| Publisher | Institute of Arctic and Alpine Research |
| Publisher location | Boulder, CO |
| Contributing office(s) | Northern Rocky Mountain Science Center |
| First page | 1 |
| Last page | 16 |
| Country | United States |
| State | Montana |
| Other Geospatial | Glacier National Park |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |