California Drought
 
Feb. 7, 2014:   California is supposed to be the Golden State.  Make that
golden brown.
 
The entire west coast of the United States is changing color as the deepest
drought in more than a century unfolds.  According to the US Dept. of
Agriculture and NOAA, dry conditions have become extreme across more than 62%
of California's land area-and there is little relief in sight.
 
"Up and down California, from Oregon to Mexico, it's dry as a bone," comments
JPL climatologst Bill Patzert. "To make matters worse, the snowpack in the
water-storing Sierras is less than 20% of normal for this time of the year."
 
http://www.youtube.com/watch?v=e5HwRXsw2Q8
 
A new ScienceCast video asks, is this climate change? The answer is here
The drought is so bad, NASA satellites can see it from space. On Jan. 18th,
2014-just one day after California governor Jerry Brown declared a state of
emergency-NASA's Terra satellite snapped a sobering picture of the Sierra
Nevada mountain range.  Where thousands of square miles of white snowpack
should have been, there was just bare dirt and rock.
 
At the Jet Propulsion Lab, a group of researchers led by Tom Painter are
preparing to fly a Twin Otter aircraft over the Sierras to investigate the
situation.  Their "Airborne Snow Observatory" is equipped with a laser radar
and a spectrometer to measure the snow's depth and reflectivity. From these
data, it is possible to calculate the water content of the Sierras within 5%
and future snowmelt rates with similar precision.
 
"The Airborne Snow Observatory was designed for times like this when we really
need to know the state of the snow pack," says Painter. "Our next flight will
be over the Tuolumne River Basin." The Tuolumne watershed and its Hetch Hetchy
Reservoir are the primary water supply for 2.6 million San Francisco Bay Area
residents.
 
http://droughtmonitor.unl.edu/
 
For updates, check the US Drought MonitorThe change in scenery is so striking,
a group of high school science students in central California have been flying
high altitude balloons to photograph it.  From the stratosphere, their home
town of Bishop looks like a settlement on the planet Mars: image, movie
 
"The lack of snow is really striking," says 17-year-old Amelia Koske-Phillips,
president of the Earth to Sky Calculus science club. "I've never seen a winter
as brown as this," adds 16-year old Carson Reid, a member of the launch team.
 
Bill Patzert blames the drought, in part, on the Pacific Decadal Oscillation,
or "PDO," a slowly oscillating pattern of sea surface temperatures in the
Pacific Ocean.  At the moment, the PDO is in its negative phase-a condition
historically linked to extreme high-pressure ridges that block West Coast
storms and give the Midwest and East Coast punishing winters.
 
"I'm often asked if this is part of global warming," says Patzert. "My answer
is `not yet.' What we're experiencing now is a natural variability that we've
seen many times in the past. Ultimately, though, climate change could make
western droughts much worse."
 
For more information about climate change and other Earth science topics, stay
tuned to Science.nasa.gov
 
Credits:
Author: Dr. Tony Phillips | Production editor: Dr. Tony Phillips | Credit:
Science@NASA
 
Web Links:
All Dry on the Western Front -- Earth Observatory
 
NASA's Airborne Snow Observatory -- JPL
 
Earth to Sky Calculus -- a citizen science club that has been photographing
the drought from the stratosphere
 
 
Regards,
 
Roger

--- D'Bridge 3.98
 * Origin: NCS BBS - Houma, LoUiSiAna (1:3828/7)