Abstract
A number of records of sea bed pressure, with durations from 10 to 32 days, have been taken near the edge of the northwest European shelf with the instrument capsule described by Collar and Spencer (1970). The principal characteristics of such records are compared with simultaneous records from shore-based stillwell tide-gauges of good quality, adjusted for atmospheric pressure. The sea bed records are shown to be markedly better in noise content at all frequencies, in tidal resolution, and in non-linear tidal effects, despite the considerable drift observed in the earlier pressure records. Tidally filtered pressure records from four simultaneous stations at 100 km spacing north of Scotland show correlated waves of low frequency, induced by the dynamic effects of weather. Three records from the same station are examined for consistency of tidal analyses, and for coherence between two of them from the same capsule.
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