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description:
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This data layer comprises porosity measurements on the upper 2 cm of seabed sediments.
Bottom sediments were collected using either a Smith McIntyre grab or a Box Core. Bulk sub-samples (6.5 ml) of surface sediment (0-2 cm) were extruded into vials which were then frozen. Porosity was determined by calculation of the wet volume as a percentage of the total volume, after freeze drying and correction for seawater salts. The accuracy of the wet/dry measurements were greater than 1%. The precision of the volume measurements were greater than 2%. |