Dear Alison

> sea_water_potential_temperature_at_sea_floor (canonical units: Celsius)
> ' Potential temperature adjacent to the ocean bottom (at the deepest grid 
> cell).'
> 
> The name itself looks fine and fits with existing syntax. I think the 
> canonical units should be Kelvin which would still allow Celsius to be used 
> in the data files because UDunits can convert between them. The definition 
> needs to be expanded a bit to include the standard CF text for potential 
> temperature:
> ' Potential temperature is the temperature a parcel of air or sea water would 
> have if moved adiabatically to sea level pressure. The potential temperature 
> at the sea floor is that of water adjacent to the ocean bottom, which would 
> usually be the deepest grid cell in an ocean model.'

This is fine, thank you.

Jonathan
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