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Groundwater Depletion in Semiarid Regions of Texas and California Threatens US F

December 31, 2022, 10:08:58 am NilsFor1611 says: blessings
August 08, 2018, 02:38:10 am suzytr says: Hello, any good churches in the Sacto, CA area, also looking in Reno NV, thanks in advance and God Bless you Smiley
January 29, 2018, 01:21:57 am Christian40 says: It will be interesting to see what happens this year Israel being 70 years as a modern nation may 14 2018
October 17, 2017, 01:25:20 am Christian40 says: It is good to type Mark is here again!  Smiley
October 16, 2017, 03:28:18 am Christian40 says: anyone else thinking that time is accelerating now? it seems im doing days in shorter time now is time being affected in some way?
September 24, 2017, 10:45:16 pm Psalm 51:17 says: The specific rule pertaining to the national anthem is found on pages A62-63 of the league rulebook. It states: “The National Anthem must be played prior to every NFL game, and all players must be on the sideline for the National Anthem. “During the National Anthem, players on the field and bench area should stand at attention, face the flag, hold helmets in their left hand, and refrain from talking. The home team should ensure that the American flag is in good condition. It should be pointed out to players and coaches that we continue to be judged by the public in this area of respect for the flag and our country. Failure to be on the field by the start of the National Anthem may result in discipline, such as fines, suspensions, and/or the forfeiture of draft choice(s) for violations of the above, including first offenses.”
September 20, 2017, 04:32:32 am Christian40 says: "The most popular Hepatitis B vaccine is nothing short of a witch’s brew including aluminum, formaldehyde, yeast, amino acids, and soy. Aluminum is a known neurotoxin that destroys cellular metabolism and function. Hundreds of studies link to the ravaging effects of aluminum. The other proteins and formaldehyde serve to activate the immune system and open up the blood-brain barrier. This is NOT a good thing."
September 19, 2017, 03:59:21 am Christian40 says: bbc international did a video about there street preaching they are good witnesses
September 14, 2017, 08:06:04 am Psalm 51:17 says: bro Mark Hunter on YT has some good, edifying stuff too.
September 14, 2017, 04:31:26 am Christian40 says: i have thought that i'm reaping from past sins then my life has been impacted in ways from having non believers in my ancestry.
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Author Topic: Groundwater Depletion in Semiarid Regions of Texas and California Threatens US F  (Read 4319 times)
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« on: September 15, 2015, 06:40:36 am »

No snow: Californian water source at 500-year low

Snow cover in the Sierra Nevada mountain range, a water lifeline for California's cities and agriculture, has hit its lowest level in 500 years, a study said Monday.

Measured on April 1, the natural, frozen reservoir was barely five percent of the 1950-2000 average, threatening tens of millions of Californians and the state's $50-billion (44-billion-euro) agriculture sector with chronic water shortages, its authors warned.

And things were set to get worse, they wrote in the journal Nature Climate Change.

"We should be prepared for this type of snow drought to occur much more frequently because of rising temperatures," lead author Valerie Trouet, a professor at the University of Arizona, said in a statement.

"Anthropogenic" –- or manmade –- global warming "is making the drought more severe," she added.

The "snowpack" of Sierra Nevada, central California's 650-kilometre (400-mile) spine, provides more than 60 percent of the state's distributed water supply, including all or part of the drinking water for 23 million people.

Greater Los Angeles and the San Francisco Bay Area are among the zones affected.

On April 1 -– when the snowpack is generally at its maximum -– California Governor Jerry Brown declared the state's first-ever mandatory water restrictions. He made the announcement while standing on dry ground that a few years ago would have been covered by a man-high snow blanket.

Extremely low winter rainfall combined with record high temperatures during the first three months of 2015 are to blame, said the study.

Scientists had already established that this year's snowpack was the smallest since annual measurements began in the 1930s, but the new research goes even further back in time.

- Tree rings - Tree rings are not an accurate source to measure anything.  Cheesy 

The team measured the rings of some 1,500 ancient blue oaks in the Central Valley -- which runs parallel with the Sierra Nevada –- for a record of annual rainfall in winter, when California receives 80 percent of its precipitation.

Given that the same storms which water the oaks also dump snow on the mountains, tree-ring width is a good proxy for what the snowpack would have been in any given year.

The team then compared their tree-ring data with a reconstruction of winter temperatures for the period 1500-1980, to create a year-by-year snowpack profile.

"This is not just unprecedented over 80 years –- it's unprecedented over 500 years," Trouet said of the findings.

California is in the grips of a four-year drought, and ravaged by wildfires that have destroyed more than 100,000 acres (40,470 hectares), hundreds of homes and businesses, authorities say.

According to the US Geological Survey, more than 120 of the state's reservoirs are less than a fifth full, and 190 under half.

This also threatens California's hydroelectric power sector -- a key source of renewable energy.

Scientists warn that climate change will likely boost the frequency and intensity of droughts.

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