ocean_sigma_coordinate
https://w3id.org/hacid/data/cs/variables/cf/ocean_sigma_coordinate <https://w3id.org/hacid/onto/data/Variable>
See Appendix D of the CF convention for information about parametric vertical coordinates. Note that the ocean sigma coordinate is not the same quantity as sea water sigma (excess of density over 1000 kg m-3), for which there are various other standard names.
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ocean_sigma_coordinate