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• OBS sensor biofouled – it is often difficult to establish the exact time this started to impact on data so it is usual to err on the side of caution. Biofouling of sensors was minimised by employing the Zebra‐Tech Hydro‐Wipers.
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Untypical high response due to presence of biological material (e.g., plankton sinking to the sea bed during and after a bloom event).
It is clear that the calibration of OBS data to provide values of in‐situ suspended sediment concentration is fraught with operational difficulties and expert interpretation is required to achieve a representative data set.