Outer Island Pier Water Quality (2021)
Water quality parameters were monitored by the CSU interns during the summer 2021 from June 2nd to August 31st. Water quality monitoring occurred each day at 2:00 pm from the end of the floating dock. Water quality parameters monitored included: water temperature, salinity, conductivity, specific conductance, dissolved oxygen, Secchi disk depth, turbidity, and pH. All measurements were made on water samples collected from at a depth of one meter.
Dissolved oxygen concentrations were highest initially (10.15 mg/L) on 6/3 and showed a decrease over the summer months correlating with increasing temperatures reaching a low of 5.76 mg/L on 8/21 (Figure lb). Salinity showed little variability, with a range of only 28.5 ppt (6/6) to 30.0 ppt (6/24), while conductivity showed a slightly larger range from 36.03 mS (6/04) to 46.20 mS (8/14) (Figure la). Both parameters showed similar variability compared to previous years. Water temperature gradually increased from the spring to the end of the summer. Water temperature ranged from 15.3°C (6/3) to a high of 25.0°C (8/27).
Water clarity, as measured by a Secchi disk, varied from 0.5 m (7/2) to 1.9 m (7/21) during the monitoring period (Figure 2a). pH ranged from a low of 7.94 (6/5) to a high of 8.17 (8/30) (Figure 2b). Variations in water temperature over the summer correlated well with changes in measured air temperature (Figure 3). Similar to other parameters this season, water clarity/turbidity and pH showed less variation than previous years.
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