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

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Video in TIB AV-Portal: 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

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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
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You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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2018
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English

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Abstract
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®, 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.
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the lessons in are famous for having the greatest known her every year tourist bring billions to the while accessing world-class
skiing the mountain snowpack is also a critical natural resource it provides % of surface water for the rapidly growing populations along the Wasatch Front Inc. Salt Lake City so for the
economy and for natural resources it's crucial to understand controls the timing and magnitude of stand out from the Wasatch Mountains many things that it's warming air temperatures in the spring that melts now it's actually the longer days and the sun's energy anything that darkens the cell surface have a powerful effect on accelerating melting it's the same concept is wearing a white or black shirt on a sunny day you'll be warmer and the lecture because it absorbs more sunlight we know that in the nearby southern Colorado Rockies dust deposition is so extreme that advances snowmelt by a
month on average in up to 2 months in the most dusty years we
know positive in the last session but we don't yet another impact on the snowpack in snow rates so in 2017 we started playing close attention to the dust and Alan Fayyad lots mountains art scene at the University of Utah but
instrumentation to measure just in near the
and we regularly sampled the snow for dust concentrations 1 of the particular stood
out for 2 reasons it deposited the most us and well most of our big dust events come from the south this 1 came from the West potentially from the dry lakebed of the great folic with more people family in solid value the gratefully has declined as more people use water upstream as
water levels dropped more of the lake bed gets exposed when when these are high enough the exposed ask blow into the solid value valley in deposited onto the loss estimate back
we analyze the amount of dust the got deposited in the snow snowpack at our steady state we used in
atmospheric model that represents the weather before during and after the dust event to trace where the dust particles were coming from we found that for the single storm dust lately came 1st from the south and then as the storm front moved the winds shifted and blew in from the west and as we hypothesized the dry lakebed integrates all to figure out what impact that as Hansen We use the amount of dust in the
snowpack to calculate how much additional summit the dust of absorbed relative to a dust-free snow pack we found from this 1 events death accelerated snowmelt by 5 days and the dust from all events accelerated some by 25 per cent we know the now fear modeling that the dust from the
dry lakebed impacted the northern what such more than where we were looking at at the solid values growing
populations in planned infrastructure projects will reduce the water flowing into the lake and the lack of protections so that it's all a pointer decimations getting more frequent in the future that indicate that we needed a closer
attention to dust source regions and science now
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