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- C34B-01: Asynchronous Snow Melt Timing Across Western North America from Transient Snowline Time Series (invited)
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NOLA CC
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Ellyn Enderlin, Boise State University (First Author, Presenting Author)
Rainey Aberle, Boise State University, Department of Geosciences
Jukes Liu, Boise State University
Glaciers across the globe have been shrinking over the last several decades, resulting in major alterations to the seasonal timing and amount of glacier melt water entering mountain streams and rivers that may have far-ranging environmental impacts. In this presentation, we focus on weekly variations in glacier snow cover across western North America from satellite images. Here we describe how the onset of seasonal snow melt and the timing of the seasonal snow cover minimum vary across the region and potential controls on the observed variability. Specifically, we show that the timing of the yearly snow cover minimum generally depends on latitude, in ~August from 62-64N to ~October from 48-50N, reflecting large-scale variations in the timing of above-freezing air temperatures and additional controls on snow melt such as shadows cast by nearby mountains. The spatial variation in the timing of the seasonal snow cover minimum influence when glacier snow melt contributes to downstream water basins.
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