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  • Environment
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Disturbing Trends For Health Of Lake Tahoe

  •  Amy Quinton 
Thursday, July 28, 2016 | Sacramento, CA
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Karin Higgins / UC Davis
 

Karin Higgins / UC Davis

2015 was another record-breaking year for Lake Tahoe - and not in a good way. 

While precipitation was near average, only 6.5 percent fell as snow. That led to record warm temperatures, and not just at the surface.

The State of the Lake Report shows the average surface temperature was the warmest on record, at 53.3 degrees,  but the temperature of the entire lake rose as well.

"Lake Tahoe is huge, if you took all of the water, and spread it out over California it would cover the state in 15 inches of water," says Geoffrey Schladow, director of the UC Davis Tahoe Environmental Research Center. "So this is a lot of water, and a temperature increase by about a half a degree."

Schladow says in the past four years, the lake has warmed at an "alarming rate" of over 0.3 degrees. That's 15 times faster than the long-term warming rate.

 0728AQ_STATELAKEc

The volume-averaged temperature of the lake for each year since 1970 is shown. In 2015 the volume-averaged temperature increased by 0.48 °F (0.26 °C) over the previous year. In the last 4 years the lake has warmed at an alarming rate of over 0.3 °F/year, 15 times faster that the long-term warming rate.  Graph / UC Davis TERC

 

"It's going to take many years to reverse that if we get the cool temperatures. It's more than likely it's not going to cool. In fact, it's more likely that it will continue to warm and it's suddenly changing the environment for everything in the entire lake food web."

The State of the Lake report also found that water clarity decreased by almost 5 feet, due in part to warmer temperatures in 2015.


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Amy Quinton

Former Environment Reporter

Amy came to Sacramento from New Hampshire Public Radio (NHPR) where she was Environment Reporter. Amy has also reported for NPR member stations WFAE in Charlotte, WAMU in Washington D.C. and American Public Media's "Marketplace."  Read Full Bio 

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