UC Davis’ annual “Tahoe: State of the Lake Report 2013” yesterday. Davis researchers have been studying Lake Tahoe’s chemistry, biology, clarity, and physics since 1968. Their reports are in depth, well put together, and extremely interesting.
Clarity in the lake has improved for the 2nd straight year from 68.7 feet to 75.3 feet (clarity was at 100 feet in 1968). This is huge as the current goal is to get Tahoe to 78 feet of clarity.
Climate change is definitely starting to affect Lake Tahoe and some of the long term consequences are being measured:
LONG TERM CHANGES IN LAKE TAHOE DETECTED IN 2013:
– 52.8 degrees Fahrenheit = the highest ever recored annual average surface temperature
– Snow has decreased in percentage of total precipitation from an average of 51% in 1910 to 36% in 2012
– Long term trend of less days with below freezing temper has caused snowmelt to peak on May 4th, much earlier than historical averages
– Tahoe had a net loss in water level this year. Tahoe rose 1.3 feet during snowmelt this year versus 3.9 feet in 2011. Last summer and fall saw the lake drop 2.3 feet.
– No deep mixing this year in Tahoe which helps promote aquatic life, brings nutrients to the surface, and helps keep the lake cool.
– Reduced numbers of tiny Cyclotella algae in 2012. This algae contributes to murkiness in the lake.
Read the Full “State of the Lake Report” Here: