ASTER User's Guide - Aster - NASA

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ASTER Users Handbook wind direction, air temperature, relative humidity), full radiation station (long and shortwave radiation up and down), a shadow band radiometer and an all sky camera. The shadow band radiometer provides information on total water vapor and aerosol optical depth. Figure 22: Field measurements at the US Coast Guard. Measurements of algal growth rate using 14 C, nutrients (N, P), chlorophyll, phytoplankton, zooplankton, light, temperature and secchi disk transparency are also made tri-monthly at the Index station (Figure 10) and monthly samples for all constituents except algal growth and light are made at the Mid-lake station (Figure 20). Many samples are taken annually around the Tahoe Basin to examine stream chemistry and snow and atmospheric deposition constituents. 11.2.4 Using ASTER to measure water clarity Currently the decline in water clarity at Lake Tahoe is measured using a secchi disk – a white disk that is lowered into the water until it is no longer visible. The UC Davis Tahoe Research Group have been making secchi disk measurements since the mid 60’s at two locations on the lake (Midlake and Index – see Figure 20). Such measurements have been used to monitor the decline in clarity from a maximum of 35 m when measurements began, to the current low of 20 m. These measurements are crucial for monitoring temporal changes in clarity but provide little 48
ASTER Users Handbook information on spatial variations in clarity across and around the lake. Knowledge of spatial variations in clarity could prove useful in identifying areas of high nutrient or sediment input into the lake. Examination of a color infrared composite image derived from ASTER for Lake Tahoe (Figure 23) indicates that due to the high clarity, the bottom of the lake is visible for some distance from the shore. Figure 23: Color Infrared Composite of ASTER bands 3, 2, 1 as R, G, B respectively. Red areas indicate vegetation, white areas are snow Places where the bottom of the lake is visible appear dark blue, for example the southern margin of the lake. The bottom can be seen for the greatest distance from the shore in ASTER band 1 and this band can be color-coded to show variations in the intensity of the bottom reflectance (Figure 24). 49
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ASTER User's Guide - Aster - NASA

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