State of the Lake 2009 - Tahoe Environmental Research Center ...

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TERC.UCDAVIS.EDU PHYSICAL PROPERTIES Average water temperature Since 1970 The volume-averaged temperature of Lake Tahoe has increased nearly a full degree since 1970, from 41.7 degrees F to 42.6 degrees F. The change in water temperature has affected the density stratification in the lake (Fig. 8.8) with TAHOE: STATE OF THE LAKE REPORT 2009 a subsequent shift in phytoplankton community structure. A published TERC study showed that small-sized diatom species were able to best adapt to the observed decrease in mixing intensity, highlighting the strong link between climate change, physical processes and species diversity. (The monthly lake temperature profile data in this figure has been smoothed and deseasonalized to best show the longterm trend.) 8.3
Temperature ( o F) TERC.UCDAVIS.EDU 53 52 51 50 49 48 PHYSICAL PROPERTIES Surface water temperature Yearly since 1968 Surface water temperatures have been recorded at the mid-lake station since 1968. Despite year-to-year variability, water temperatures show an increas- 1968 1970 1972 1974 1976 1978 1980 1982 1984 TAHOE: STATE OF THE LAKE REPORT 2009 ing trend. The average temperature in 1968 was 50.3 degrees F. For 2008, the average surface water temperature was 51.7 degrees F. 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 8.4
Page 1 and 2: TAHOE: STATE OF THE LAKE REPORT 200
Page 3 and 4: INTRODUCTION The University of Cali
Page 5 and 6: EXECUTIVE SUMMARY (CONTINUED FROM P
Page 7 and 8: ABOUT LAKE TAHOE AND THE TAHOE BASI
Page 9 and 10: MAP OF TAHOE BASIN DATA COLLECTION
Page 11 and 12: Rainbow, Brook, Brown and Lake trou
Page 13 and 14: 100% 90% 80% 70% 60% 50% 40% 30% 20
Page 15 and 16: ASIAN CLAM Asian Clam Excretion Exp
Page 17 and 18: ASIAN CLAM Asian Clam Size Distribu
Page 19 and 20: Temperature ( o F) 60 55 50 35 30 M
Page 21 and 22: Temperature ( o F) 70 60 50 40 30 2
Page 23 and 24: Inches 70 60 50 40 30 20 10 0 METEO
Page 25 and 26: Percent 80 70 60 50 40 30 20 10 0 M
Page 27 and 28: PHYSICAL PROPERTIES TERC.UCDAVIS.ED
Page 29: Feet 6232 6230 6228 6226 6224 6222
Page 33 and 34: Temperature ( o F) TERC.UCDAVIS.EDU
Page 35 and 36: Density Difference (kilograms per c
Page 37 and 38: Mean daily streamflow (cubic feet p
Page 39 and 40: NUTRIENTS AND PARTICLES TERC.UCDAVI
Page 41 and 42: TERC.UCDAVIS.EDU NUTRIENTS AND PART
Page 43 and 44: Metric Tons TERC.UCDAVIS.EDU 10 8 6
Page 45 and 46: Dissolved inorganic nitrogen (micro
Page 47 and 48: Nitrate−nitrogen (micrograms per
Page 49 and 50: BIOLOGY 10
Page 51 and 52: BIOLOGY Algae abundance Yearly sinc
Page 53 and 54: BIOLOGY Depth of chlorophyll maximu
Page 55 and 56: BIOLOGY TAHOE: STATE OF THE LAKE RE
Page 57 and 58: BIOLOGY Nutrient limitation of alga
Page 59 and 60: BIOLOGY Shoreline algae distributio
Page 61 and 62: TERC.UCDAVIS.EDU CLARITY Annual ave
Page 63 and 64: Depth (feet) TERC.UCDAVIS.EDU CLARI
Page 65: TERC.UCDAVIS.EDU OUTREACH AND EDUCA

State of the Lake 2009 - Tahoe Environmental Research Center ...

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