Adam Jensen

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May 10, 2013
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Aerial snow surveys could be boon for backcountry skiing

NASA could soon help backcountry skiers and snowboarders plan their next tour.

Aerial snow surveys of the Tuolumne River Basin began a month ago as part of an effort to give California more accurate estimates of the water held in the Sierra Nevada snowpack.

Researchers from NASA’s Jet Propulsion Laboratory and the California Department of Water Resources showed off the technology at Lake Tahoe Airport recently.

By using a combination of sensing equipment mounted in the bottom of a twin-prop plane, scientists will be able to fill in a major missing puzzle peace in the snowmelt equation. Direct solar radiation accounts for about 90 percent of snowmelt, but can’t be measured using traditional on-the-ground surveys and remote sensors, said Tom Painter, the principal investigator on the aerial surveys for NASA’s Jet Propulsion Laboratory.

The data gathered from the aerial surveys can be displayed in detailed maps showing how much snow remains in specific areas, even terrain in the High Sierra, well above currently existing remote sensing technology.

“There’s still a lot of snow up there that we don’t know anything about,” said Frank Gehrke, chief of the California Cooperative Snow Surveys Program.

The data gathered can also be made available to the public within 24 hours of collection, Painter said.

Because of the precision of the technology and its nearly real-time availability, the information gathered could have a wide range of unanticipated uses, including wildlife management, wildfire preparedness and recreation, Gehrke said. For example, someone backpacking the Sierra Nevada could see how much snow is left along the Sierra Crest.

“It’d be huge,” Gehrke added about the possibilities for backcountry skiers and snowboarders. They’d be able to see accurate, up to date basin-by-basin snowpack totals for remote areas, he said.

The aerial snow survey project is currently funded for three years and focuses on the Tuolumne River Basin.

With the lack of snow, researchers could gather baseline data for the major watersheds in the southern Sierra this year, Gehrke said. Painter said he sees the program expanding, but the timeline is funding-dependent and whether large swaths of the mountain range could be surveyed from the air is unknown.

The last snow survey of the year recently found the Sierra Nevada snowpack is at just 17 percent of normal for this date. Surveyors found no snow at a survey site near Echo Summit.

Initial results of the aerial surveys are not yet available online. Data from the flights is expected to be posted at as it becomes available.

Adam Jensen is a staff writer at the Tahoe Daily Tribune.

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The Union Updated May 10, 2013 11:14PM Published May 10, 2013 09:54PM Copyright 2013 The Union. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.