Slower snowmelt affects downstream water availability in western mountains

August 17, 2016, University of Nevada, Reno
Ecohydrologist Adrian Harpold from the Universitiy of Nevada, Reno's College of Agriculture, Biotechnology and Natural Resources takes measurements of the Sierra Nevada mountain snowpack. He studies impacts of the Sierra Nevada mountain snowpack on streams, rivers and reservoirs. Credit: University of Nevada, Reno.

Western communities are facing effects of a warming climate with slower and earlier snowmelt reducing streamflows and possibly the amount of water reaching reservoirs used for drinking water and agriculture, according to a study published in July.

"As the climate warms, there is actually a slower snowmelt - both in timing and rates, which makes for a less efficient streamflow," Adrian Harpold, ecohydrologist at the University of Nevada, Reno said. Harpold, who initiated the study two years ago at the University of Colorado Boulder, is a co-author of the paper published in AGU publications Geophysical Research Letters.

"I know, it's counterintuitive, but with a warming climate snowmelt starts sooner in the season, and at a slower rate because the warming occurs earlier when days are shorter and we have less sunlight," he said. "What makes runoff less efficient is that slower snowmelt reduces the amount of moisture being pushed deep into the subsurface where it is less likely to evaporate"

Higher snow melt rates can develop a pressure gradient that forces moisture deeper into the ground. With lower snow melt rates less leaves the subsurface where the root systems of trees, bushes and grasses can access the water, which increases the amount of evapotranspiration into the atmosphere.

"It's ubiquitous in the western U.S.; the trends are consistent to all mountain ranges across the West," Harpold said.

Harpold, who's Nevada Mountain Ecohydrology Lab is based in the College of Agriculture, Biotechnology and Natural Resources, continued to work with the team from CU Boulder after coming to the University of Nevada, Reno.

The researchers used an exclusive modeling system to study the effects of slower snowmelt across various regions of the western United States including the Cascade range, the Sierra Nevada range, the Wasatch range and the Rocky Mountains. All of these areas see significant seasonal snow accumulation and generate water resources for downstream communities.

"Theo did the heavy lifting with the interpretation of the results and the writing of the paper," Harpold said of lead author of the study Theodore Barnhart, a graduate researcher at the Institute for Arctic and Alpine Research at CU Boulder.

"Of all the regions we studied, streamflow from Colorado's Rocky Mountains is most sensitive to a change in snowmelt," Barnhart said. "This analysis suggests that all of the regions studied will experience a decrease in streamflow with a decrease in snowmelt rate, with some regions exhibiting more streamflow sensitivity than others."

"The Sierra is affected similarly and, besides the Truckee River basin, Northern California will feel an impact from the reduced and early streamflows," Harpold said. "The snowpack in the Sierra is one massive reservoir that our communities, forests and river environments have come to rely on.

"Given that 60 million people in the western U.S. depend on snowmelt for their water supply, the future decline in snowmelt-derived streamflow may place additional stress on over-allocated water supplies," said Noah Molotch the director of the Center for Water Earth Science & Technology CWEST in the CU Boulder Department of Geography and also a co-author of the paper.

Explore further: Earlier snowmelt decreases streamflow, reduces forests' ability to regulate atmospheric carbon dioxide

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1.8 / 5 (5) Aug 17, 2016
So what they are saying is because of global warming much of this water will fill our aquifers instead of running out to sea. Oh the horror.
3.2 / 5 (5) Aug 17, 2016
Hi MR166. :)

No, mate, they found the EXACT OPPOSITE of what you just said. Read again.

It says that slower snow melt rate produces a 'lower pressure gradients in the meltwater' levels; which in turn means less water is pushed down into the lower ground strata and out of immediate reach of the root zones of the forest trees which would otherwise transpire a lot of it before it reached the deeper strata where the aquifer levels are.

The other problem is that a lot of water remains close to the surface (in that root zone) and is also more vulnerable to solar heating in the shallower ground strata and hence greater evaporation rates.

Add increased evaporation losses to increased transpiration losses from trees/grasses, and TOTAL/RATE of evapo-transpiration losses increases due to lesser pressure gradient during SLOWER snow melt.

So, if meltwater stays in shallower strata and easier to evapo-transpiration to atmosphere, then LESS reaches aquifers!

Ok? Cheers. :)
Uncle Ira
5 / 5 (2) Aug 17, 2016
@ Really-Skippy. How you are Cher? I am good, thanks for asking.

I caught this one before the automatic karma voter give you the one. You do pretty good on the climatic stuffs so I don't like you to get one votes over here. Keep up the good work, this is good stuffs.
1.7 / 5 (6) Aug 17, 2016
human caused climate change is a magnificent fraud.

Have you kissed a fracker today? You should. Gasoline is below $2.00 a gallon in states where liberty is more important that government revenue.

1 / 5 (2) Sep 09, 2016
Anyone studying the phenomenon of delusion should start with this fool that has confused liberty with gasoline.

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