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Ross Petersen

Doctoral student

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Implications of a shrinking Great Salt Lake for dust on snow deposition in the Wasatch Mountains, UT, as informed by a source to sink case study from the 13-14 April 2017 dust event

Author

  • S. Mc Kenzie Skiles
  • Derek V. Mallia
  • A. Gannet Hallar
  • John C. Lin
  • Andrew Lambert
  • Ross Petersen
  • Steven Clark

Summary, in English


The deposition of dust on snow accelerates melt by perturbing snow albedo, directly by darkening the snow surface and indirectly by enhancing snow grain growth. The snow darkening process impacts hydrology by shifting runoff timing and magnitude. Dust on snow deposition has been documented in the Wasatch Mountains, snowmelt from which accounts for up to 80% of surface water supply for Salt Lake City, UT, but the impact on snow melt has not yet been investigated. Here, we present a case study of a dust event observed in the Wasatch (13-14th April, 2017), sampled coincidentally in the air and at the snow surface at an instrumented high elevation site (Atwater Study Plot, Alta, UT). Atmospheric backtrajectory modeling, the results of which were supported by measurements, showed that dust originated predominantly from the west: the Great Salt Lake Desert and the Great Salt Lake (GSL) dry lake bed. The deposited dust mass accounted for ∼50% of the season total dust loading in snow, and daily mean radiative forcing of 20-50 W m
-2
accelerated snow melt by approximately 25%. This has important implications for The Greatest Snow on Earth
α
, and snow water resources; the water level of the GSL has been declining, exposing dry lake beds, and there are no legal water rights or protections to maintain lake levels or mitigate dust emission.

Publishing year

2018-12-01

Language

English

Publication/Series

Environmental Research Letters

Volume

13

Issue

12

Document type

Journal article review

Publisher

IOP Publishing

Topic

  • Environmental Sciences
  • Meteorology and Atmospheric Sciences

Keywords

  • aerosols
  • dust
  • radiative forcing
  • snow
  • snowmelt

Status

Published

ISBN/ISSN/Other

  • ISSN: 1748-9326