AWAC3.1, deployment 2 (AWAC 6198, Seapoint OBS 13364) Sediment concentration vs actual ADC count


40 35 30 25 20 15 10 5 0 0 5000 10000 ADC count Figure 10. Turbidity tank OBS calibration for AWAC3.1, deployment 2


This provided a linear regression (slope and intercept) that could then in theory be used to calibrate the AWAC OBS data.


However, the data summary obtained from all the turbidity tank calibrations (see table below) corroborated the issue of the dark sediment samples. These calibrations gave much higher slopes compared to the samples not containing significant amounts of decayed organic matter. This was probably due to the dark water absorbing proportionately more light than reflected. If these calibrations with higher slopes were used they would give artificially high suspended sediment concentrations for those deployments affected.


15000 20000 25000


y = 0.001619x + 0.190077 R² = 0.999425


EAST ANGLIA THREE – CEFAS FINAL TECHNICAL REPORT


Page 23 of 82


Sediment concentration (mg/l)


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