State of the Lake 2009 - Tahoe Environmental Research Center ...
State of the Lake 2009 - Tahoe Environmental Research Center ...
State of the Lake 2009 - Tahoe Environmental Research Center ...
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Dissolved inorganic nitrogen<br />
(micrograms per liter)<br />
TERC.UCDAVIS.EDU<br />
NUTRIENTS AND PARTICLES<br />
400<br />
350<br />
300<br />
250<br />
200<br />
150<br />
100<br />
50<br />
0<br />
1980<br />
TAHOE: STATE OF THE LAKE REPORT <strong>2009</strong><br />
Nutrient concentrations in rain and snow<br />
Yearly since 1981<br />
Nutrients in rainwater and snow<br />
(called wet deposition) contribute<br />
large amounts <strong>of</strong> nitrogen, but also<br />
significant phosphorus, to <strong>Lake</strong><br />
<strong>Tahoe</strong>. Nutrients in precipitation have<br />
been measured near Ward Creek since<br />
1981, and show no consistent upward<br />
or downward trend. Annual concentrations<br />
in precipitation <strong>of</strong> dissolved<br />
inorganic nitrogen (DIN) and soluble<br />
1982<br />
1984<br />
1986<br />
1988<br />
1990<br />
1992<br />
1994<br />
1996<br />
1998<br />
2000<br />
2002<br />
2004<br />
2006<br />
2008<br />
DIN Avg. Conc. SRP Avg. Conc.<br />
reactive phosphorus (SRP) vary from<br />
year to year. In 2008, concentrations<br />
<strong>of</strong> DIN in precipitation remained relatively<br />
low, but were close to <strong>the</strong> average<br />
for SRP since <strong>the</strong> early 1990s.<br />
6<br />
5<br />
4<br />
3<br />
2<br />
1<br />
0<br />
9.6
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