"SDN:P07::CFSN0451" . "accepted"@en . "" . . . . "2006-09-26 18:12:43.0" . "1" . . . "'Layer' means any layer with upper and lower boundaries that have constant values in some vertical coordinate. There must be a vertical coordinate variable indicating the extent of the layer(s). If the layers are model layers, the vertical coordinate can be model_level_number, but it is recommended to specify a physical coordinate (in a scalar or auxiliary coordinate variable) as well. Ocean potential vorticity is the vertically averaged absolute vorticity of a layer of the ocean divided by the thickness of the layer."@en . "SDN:P07::CFSN0451" . "1" . "false" . "2006-09-26 18:12:43.0" . . . . "potential_vorticity_of_ocean_layer"@en . . "SDN:P07::CFSN0451" .