Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert...
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![Page 1: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/1.jpg)
Where Deserts and Mountains Collide
The Implications of Accelerated Snowmelt
by Disturbed Desert Dust Thomas H. PainterSnow Optics LaboratoryUniversity of Utah
![Page 2: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/2.jpg)
Snowmelt and Water• 75% of freshwater comes
from snow in the Western US
• Mountain snowpack provides enormous, critical reservoir capacity
• Early snowmelt increases growing season length, evapotranspiration, and temperatures
• Rate of snowmelt controls water management and yield
![Page 3: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/3.jpg)
Photo: Chris Landry, Center for Snow and Avalanche Studies
![Page 4: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/4.jpg)
Reflectivity = 72%
Absorption = 28%
Reflectivity =43%
Absorption = 57%
Snow Albedo
Reflect
ivit
y
![Page 5: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/5.jpg)
Impact of Dust: A Perfect Storm
Dust is well timed
Dust is well placed
Dust is, well, darker than snow
April 2009 May 2009
![Page 6: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/6.jpg)
Changes in Dust Loading
Post-disturbance
~ 1850 AD
Pre-disturbance
From Neff et al (2008), Nature GeosciencesFrom lake sediments in the Colorado Rockies
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Present
Photo: McKenzie Skiles, Snow Optics Laboratory
![Page 8: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/8.jpg)
Phoenix 2006
Future Dust Loading
![Page 9: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/9.jpg)
albedo = 0.72
Before disturbance
albedo = 0.43
After disturbance
Snowmelt Modeling
Senator Beck Basin Study Area, Colorado, 2006
Snow
wate
r equiv
ale
nt
(mm
)
Cleaner (before disturbance)Dirtier (after disturbance )
![Page 10: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/10.jpg)
Informing Water Managers
![Page 11: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/11.jpg)
Colorado River Basin
May 6, 2009
MODIS-DRFS
Daily
sun
light a
bso
rbed b
y d
ust
(W/m
2)
![Page 12: Where Deserts and Mountains Collide The Implications of Accelerated Snowmelt by Disturbed Desert Dust Thomas H. Painter Snow Optics Laboratory University.](https://reader030.fdocuments.in/reader030/viewer/2022013011/56649da95503460f94a9652f/html5/thumbnails/12.jpg)
Water in the Colorado River Basin
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