I agree that we probably need these names now. I'd like to suggest, though, that the definition of absolute salinity should start with the phrase 'mass fraction of salt in seawater', or maybe 'concentration of salt in seawater'.
And while we're at it, we should probably consider revising the definition of sea_water_salinity; currently all we have is: "The unit of salinity is PSU, which is dimensionless. The units attribute should be given as 1e-3 or 0.001 i.e. parts per thousand if salinity is in PSU." The units designation implies that we're using practical salinity, but the definition should probably be more explicit. We could add something like "Salinity ratio on the Practical Salinity Scale." Cheers - Nan On 7/6/11 3:35 AM, paul.dur...@csiro.au wrote:
I'd like to propose a series of new standard names, these names are associated with the recent release of the Thermodynamic Equation Of Seawater 2010 (TEOS-10 - www.teos-10.org). Additional to these names, I would also like to propose the "change_over_time_in_*" prefixes are also created. The proposed new standard names, along with definition, units and reference details are below. *** sea_water_conservative_temperature Definition: Conservative Temperature is potential enthalpy divided by a fixed value of the specific heat of seawater, namely cp_0 = 3991.86795711963 J kg-1 K-1. Conservative temperature is designed to be as close as possible to potential temperature, but is two orders of magnitude more conservative in the ocean. Because of this, Conservative Temperature can be regarded as being proportional to the heat content of seawater per unit mass. Canonical units: K Reference: www.teos-10.org change_over_time_in_sea_water_conservative_temperature sea_water_absolute_salinity Definition: Absolute Salinity is the salinity variable that when used with the TEOS-10 expression for density yields the correct density of a seawater sample even when the sample is not of Standard Composition. In practice Absolute Salinity is often calculated from Practical Salinity and a value of Absolute Salinity Anomaly which is found using computer software via a global look-up table. Canonical units: g kg-1 Reference: www.teos-10.org change_over_time_in_sea_water_absolute_salinity sea_water_preformed_salinity Definition: Preformed Salinity is a salinity variable that is designed to be as conservative as possible, by removing the estimated biogeochemical influences on the seawater composition from other forms of salinity. Canonical units: g kg-1 Reference: www.teos-10.org change_over_time_in_sea_water_preformed_salinity sea_water_potential_enthalpy Definition: Potential enthalpy is the enthalpy of a seawater parcel after an adiabatic and isohaline change in pressure from its in situ pressure to the sea pressure p = 0 dbar. Canonical units: J kg-1 Reference: www.teos-10.org change_over_time_in_sea_water_potential_enthalpy *** Cheers, P _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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