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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.
Depth range, in meters. 10 = 0-10 m, 20 = 10-20 m, 50 = 20-50 m, 100 = 50-100 m, 150 = 100-150 m, 200 = 150-200 m, 250 = 200-250 m, 300 = 250-300 m, 350 = 300-350 m, 400 = 350-400 m, 500 = 400-500 m, gt_500 = greater than 500 m.