String corresponding to format 'YYYY-MM-DDThh:mm:ss.sssZ' or other valid ISO8601 string.

Longitude east.

Latitude north.

The distance between sea surface and sea bed measured from the sea surface at a particular instant in space and time.

One down-and-up cycle of the CTD, consisting of a downcast and upcast.

Device for obtaining samples of water at a specific depth.

The force per unit area exerted by the water column on a mobile sensor located in the water column.

Temperature of the water body by CTD or STD.

Salinity of the water body by CTD

Concentration of dissolved oxygen per unit volume of the water column. Oxygen may be expressed in terms of mass, volume or quantity of substance.

Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate>unknown phase] by in-situ chlorophyll fluorometer.

The quantity of coloured organic compounds in solution in unit volume of any body of water.

Concentration of dissolved inorganic carbon per unit volume of the water column. Solute may be expressed in terms of mass quantity of substance.

Concentration of acid-neutralizing bases per unit volume of the water column. Solute may be expressed in terms of mass or quantity of substance.

Concentration of nitrite per unit volume of the water column. Nitrite may be expressed in terms of mass or quantity of substance.

Concentration of nitrate per unit volume of the water column. Nitrate may be expressed in terms of mass or quantity of substance.

Concentration of silicate per unit volume of the water column. Silicate may be expressed in terms of mass or quantity of substance.

Quantity or mass of phosphate per unit volume of the water body determined by an unknown analytical method following filtration through an unspecified filter type.

Concentration of ammonium per unit volume of the water column. Ammonium may be expressed in terms of mass or quantity of substance.