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Observation/sample depth below the sea surface. Units often reported as: meters, feet.
When used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.
The depth recorded by the depth meter on HOV Alvin or ROV Jason taken from renav data at the time when the sample collection was recorded. Depth is reported to the nearest meter. If there was ambiguity in the records of collection depth, all potential depths are provided separated by the pipe (|) symbol. Missing data identifier NR (not recorded).