Sierra

Chinese dust brings better snow to the Sierra

sierra+chopper+mav+lao.jpg
Eastern side of the Sierra Nevada from Owens Valley. LA Observed file photo

I love this story. Atmospheric scientists flying in C-130 aircraft over the Sierra Nevada discovered that, in at least one instance, more snow fell when the water droplets coalesced around particles of airborne dust that blew across the Pacific Ocean from China. Plain old California dust didn't have the same magic power to induce snow fall, which we all know is the key to California's water supply. The scientists presented at the American Association for the Advancement of Science this week in Vancouver. From the Bay Citizen (in the New York Times:)

In experiments that began in 2009, the scientists discovered that dust that glides on high-altitude jet streams from Asia over the Pacific Ocean plays a substantial role in seeding snowflakes that fall over the Sierras.

Industrial pollution, bacteria, heavy metals, dust and other aerosols flow freely from Asia to California. ... Raindrops and snowflakes cannot fall out of a cloud unless there is a floating seed husk, piece of pollen, speck of dust or other aerosol that they can cling to and grow around.

“In order for water to condense out of the water vapor and into a droplet, it has to have a surface to condense on,” said Doug Collins, a chemist at the University of California who is involved with the Sierra studies. “Aerosols provide that surface.”

The work is part of the CalWater project to study our water supply by the California Energy Commission, the National Oceanic and Atmospheric Administration and Scripps Institution of Oceanography at UC San Diego. Collins is at UCSD.


More by Kevin Roderick:
Gustavo Arellano, many others join LA Times staff
Power out Monday across Malibu
Put Jamal Khashoggi Square outside the Saudi consulate on Sawtelle
Here's who the LA Times has newly hired*
LA Observed Notes: Clippers hire big-time writer, unfunny Emmys, editor memo at the Times and more
Recent Sierra stories on LA Observed:
'There’s something sacred about this place'
New tarantula near Folsom Prison named for Johnny Cash
Ahwahnee Hotel, Curry Village to get new names
Sierra snowpack is more than double last year at this time
Mammoth gets 3 feet of snow, plans to open Thursday
Ansel Adams' Manzanar photos are in town
Sierra snowpack was probably the worst in 500 years
Is the drought killing the giant Sequoias? (video)


 

LA Observed on Twitter