[CF-metadata] new TEOS-10 standard names
Dear Nan et al., I want to weigh in to this discussion, as chair of SCOR/IAPSO Working Group 127. In June 2009 the Intergovernmental Oceanographic Commission, which is comprised of 146 nations, adopted TEOS-10 as the formal definition of seawater properties (and of ice and of humid air). Part of TEOS-10 is the adoption of Absolute Salinity as the salinity variable which replaces Practical Salinity as the salinity argument for the algorithms that calculate density etc. Because of the proliferation of different types of salinity, it is particularly important that the single word "Salinity" not be used henceforth. Rather, "Practical Salinity" should be used for Practical Salinity (not "Salinity"), and Absolute Salinity should be referred to as "Absolute Salinity" (not "Salinity"). The symbols S_P and S_A should be used, and the use of S should be discontinued immediately. This is outlined in the attached Announcement which will shortly appear in 21 oceanographic journals. This Announcement specifically requests editors and authors to use S_P and S_A, not S. The aim of this recommendation is to minimize the potential for confusion. We in WG127 have met with representatives of instrument manufacturers and they will be providing output from their software in the above manner. That is, they will discontinue the use of "Salinity" and of "S". I note that a team of four people have recently installed TEOS-10 into MOM4, and so we now have Absolute Salinity S_A and Preformed Salinity, S_star, in MOM4. So this naming convention is actually already an issue in the ocean modelling world. In the same vein, ocean models should not carry a variable called "temperature" but rather should carry either "potential temperature" or "Conservative Temperature" or both. It is clear that we are now on the cusp of a transition in oceanography, with the potential for confusion unless we are all very careful in correctly labeling our variables. I hope this discussion of the thinking of SCOR/IAPSO WG127 helps your community with the naming conventions for ocean and climate models, With best wishes, Trevor PS. As for some definitions, I would suggest something along the lines of sea_water_Practical_Salinity: Definition: Salinity measured on the Practical Salinity Scale of 1978 (PSS-78), which is based on measurements of the electrical conductivity of seawater. sea_water_Absolute_Salinity: Definition: The mass fraction of dissolved material in seawater as defined by the Thermodynamic Equation Of Seawater - 2010 (TEOS-10). Absolute Salinity incorporates the spatial variations in the composition of seawater. This type of absolute salinity is also called "Density Salinity". Note that I think the sea surface salinity estimated from satellite is output as Practical Salinity. Note also that there are about 4 different types of absolute salinity (the subject is rather complicated and involves carbon chemistry), and TEOS-10 has adopted the one that best estimates density, as incorporated into the above definition. From: Nan Galbraith [ngalbra...@whoi.edu] Sent: Friday, 8 July 2011 12:53 AM To: Durack, Paul (CMAR, Hobart) Cc: CF-metadata@cgd.ucar.edu; McDougall, Trevor (CMAR, Hobart) Subject: Re: [CF-metadata] new TEOS-10 standard names Hi Paul - I'm not sure if anyone else is ready to retire salinity as a standard name meaning 'salinity on the practical salinity scale'. Also I still think your proposed definitions are a little too closely tied to the teos-10 code and to the measurement/calculation methods. For example, where does remotely sensed surface salinity fit in? I'm really not sure, but I suspect it's reported on the PSS, but without a conductivity observable in the "raw" data. Which reminds me, do you want to add sea_surface_absolute_salinity to your list? Personally, I'd go with definitions closer to: sea_water_salinity: Salt content of seawater on the Practical Salinity Scale of 1978 (PSS-78), usually based on the electrical conductivity of seawater. sea_water_absolute_salinity Definition: The mass fraction of salts in seawater as defined by the Thermodynamic Equation Of Seawater - 2010 (TEOS-10), which includes corrections for spatial variations in the composition of seawater. Cheers - Nan On 7/6/11 9:45 PM, paul.dur...@csiro.au wrote: > Fair point Nan.. > > We should then do this.. > > Convert the current "sea_water_salinity" (to be discontinued in its use) to > be an alias of the new standard name "sea_water_practical_salinity". > > An updated definition for "sea_water_absolute_salinity" following your > suggestion is included below, plus a new definition for > "sea_water_practical_salinity". > > I would recommend each of the new standard names also has an additional copy > created, with the prefix "change_over_time_in_
Re: [CF-metadata] new TEOS-10 standard names
Dear Trevor, Could you please clarify: Are "potential temperature" and "conservative temperature" identical, or is "conservative temperature" what everyone else considers to be simply "temperature", or what? thanks, Karl On 7/21/11 3:29 AM, trevor.mcdoug...@csiro.au wrote: Dear Nan et al., I want to weigh in to this discussion, as chair of SCOR/IAPSO Working Group 127. In June 2009 the Intergovernmental Oceanographic Commission, which is comprised of 146 nations, adopted TEOS-10 as the formal definition of seawater properties (and of ice and of humid air). Part of TEOS-10 is the adoption of Absolute Salinity as the salinity variable which replaces Practical Salinity as the salinity argument for the algorithms that calculate density etc. Because of the proliferation of different types of salinity, it is particularly important that the single word "Salinity" not be used henceforth. Rather, "Practical Salinity" should be used for Practical Salinity (not "Salinity"), and Absolute Salinity should be referred to as "Absolute Salinity" (not "Salinity"). The symbols S_P and S_A should be used, and the use of S should be discontinued immediately. This is outlined in the attached Announcement which will shortly appear in 21 oceanographic journals. This Announcement specifically requests editors and authors to use S_P and S_A, not S. The aim of this recommendation is to minimize the potential for confusion. We in WG127 have met with representatives of instrument manufacturers and they will be providing output from their software in the above manner. That is, they will discontinue the use of "Salinity" and of "S". I note that a team of four people have recently installed TEOS-10 into MOM4, and so we now have Absolute Salinity S_A and Preformed Salinity, S_star, in MOM4. So this naming convention is actually already an issue in the ocean modelling world. In the same vein, ocean models should not carry a variable called "temperature" but rather should carry either "potential temperature" or "Conservative Temperature" or both. It is clear that we are now on the cusp of a transition in oceanography, with the potential for confusion unless we are all very careful in correctly labeling our variables. I hope this discussion of the thinking of SCOR/IAPSO WG127 helps your community with the naming conventions for ocean and climate models, With best wishes, Trevor PS. As for some definitions, I would suggest something along the lines of sea_water_Practical_Salinity: Definition: Salinity measured on the Practical Salinity Scale of 1978 (PSS-78), which is based on measurements of the electrical conductivity of seawater. sea_water_Absolute_Salinity: Definition: The mass fraction of dissolved material in seawater as defined by the Thermodynamic Equation Of Seawater - 2010 (TEOS-10). Absolute Salinity incorporates the spatial variations in the composition of seawater. This type of absolute salinity is also called "Density Salinity". Note that I think the sea surface salinity estimated from satellite is output as Practical Salinity. Note also that there are about 4 different types of absolute salinity (the subject is rather complicated and involves carbon chemistry), and TEOS-10 has adopted the one that best estimates density, as incorporated into the above definition. From: Nan Galbraith [ngalbra...@whoi.edu] Sent: Friday, 8 July 2011 12:53 AM To: Durack, Paul (CMAR, Hobart) Cc: CF-metadata@cgd.ucar.edu; McDougall, Trevor (CMAR, Hobart) Subject: Re: [CF-metadata] new TEOS-10 standard names Hi Paul - I'm not sure if anyone else is ready to retire salinity as a standard name meaning 'salinity on the practical salinity scale'. Also I still think your proposed definitions are a little too closely tied to the teos-10 code and to the measurement/calculation methods. For example, where does remotely sensed surface salinity fit in? I'm really not sure, but I suspect it's reported on the PSS, but without a conductivity observable in the "raw" data. Which reminds me, do you want to add sea_surface_absolute_salinity to your list? Personally, I'd go with definitions closer to: sea_water_salinity: Salt content of seawater on the Practical Salinity Scale of 1978 (PSS-78), usually based on the electrical conductivity of seawater. sea_water_absolute_salinity Definition: The mass fraction of salts in seawater as defined by the Thermodynamic Equation Of Seawater - 2010 (TEOS-10), which includes corrections for spatial variations in the composition of seawater. Cheers - Nan On 7/6/11 9:45 PM, paul.dur...@csiro.au wrote: Fair point Nan.. We should then do this.. Convert the current "sea_water_salinity" (to be discontinued in its use) to be an alias of the new standard name "sea_water_practical_salinity". An updated definition for "sea_water_absolute
[CF-metadata] Standard name table update 22 July 2011
Dear All, The standard name table will be updated tomorrow with new names and aliases that have been agreed over recent months. Details of the planned changes are given below. The update will be performed with the CEDA vocabulary editor. The changes will be submitted to the NERC vocabulary server today and should be published overnight. Tomorrow I will update the xml and html versions of the standard name table on the CF website. In this way the date and version information in the two locations will be kept synchronised. I will post again when the update is complete. Apologies for not giving the usual week's notice of this update, but I will be on leave for two weeks between 25 July and 5 August and I wanted to get as many agreed names as possible into the table before then. At the end of this email is a link to the "current status" page of the vocabulary editor. The page shows entries for all the names that are included in this update plus some more that are still under discussion. There are some mailing list threads for which entries have not yet been added to the editor, e.g. Martin Schultz's emission names and some sea surface wave names dating back to 2010. I will complete the task of creating entries for all open standard names discussions when I return from leave. Best wishes, Alison --- 1. New names a. Iceberg concentration name. Proposed by Olivier Lauret. number_of_icebergs_per_unit_area; m-2 b. Sea water property changes over time. Proposed by Paul Durack. change_over_time_in_sea_water_neutral_density; kg m-3 sea_water_neutral_density; kg m-3 change_over_time_in_sea_water_potential_density; kg m-3 change_over_time_in_sea_water_density; kg m-3 change_over_time_in_sea_water_potential_temperature; K change_over_time_in_sea_water_temperature; K change_over_time_in_sea_water_salinity; 1e-3 c. Martian climate model data. Proposed by Alison Pamment on behalf of Luca Montabone. atmosphere_optical_thickness_due_to_dust_dry_aerosol; 1 surface_frozen_carbon_dioxide_amount; kg m-2 d. Ice sheet mass balance names. Proposed by Jonathan Gregory. surface_snow_and_ice_refreezing_flux; kg m-2 s-1 surface_snow_and_ice_melt_flux; kg m-2 s-1 e. MSG names. Proposed by Maarten Plieger. thickness_of_liquid_water_cloud; m platform_zenith_angle; degree f. CMIP5 coordinate variable. Proposed by Karl Taylor. depth_below_geoid; m 2. Aliases for existing names a. Standardization of all mass_content names. Proposed by Alison Pamment. water_vapor_content_of_atmosphere_layer becomes mass_content_of_water_vapor_in_atmosphere_layer water_content_of_atmosphere_layer becomes mass_content_of_water_in_atmosphere_layer tendency_of_water_vapor_content_of_atmosphere_layer_due_to_turbulence becomes tendency_of_mass_content_of_water_vapor_in_atmosphere_layer_due_to_turbulence tendency_of_water_vapor_content_of_atmosphere_layer_due_to_shallow_convection becomes tendency_of_mass_content_of_water_vapor_in_atmosphere_layer_due_to_shallow_convection tendency_of_water_vapor_content_of_atmosphere_layer_due_to_deep_convection becomes tendency_of_mass_content_of_water_vapor_in_atmosphere_layer_due_to_deep_convection tendency_of_water_vapor_content_of_atmosphere_layer_due_to_convection becomes tendency_of_mass_content_of_water_vapor_in_atmosphere_layer_due_to_convection tendency_of_water_vapor_content_of_atmosphere_layer becomes tendency_of_mass_content_of_water_vapor_in_atmosphere_layer tendency_of_atmosphere_water_vapor_content_due_to_turbulence becomes tendency_of_atmosphere_mass_content_of_water_vapor_due_to_turbulence tendency_of_atmosphere_water_vapor_content_due_to_shallow_convection becomes tendency_of_atmosphere_mass_content_of_water_vapor_due_to_shallow_convection tendency_of_atmosphere_water_vapor_content_due_to_deep_convection becomes tendency_of_atmosphere_mass_content_of_water_vapor_due_to_deep_convection tendency_of_atmosphere_water_vapor_content_due_to_convection becomes tendency_of_atmosphere_mass_content_of_water_vapor_due_to_convection tendency_of_atmosphere_water_vapor_content becomes tendency_of_atmosphere_mass_content_of_water_vapor tendency_of_atmosphere_water_content_due_to_advection becomes tendency_of_atmosphere_mass_content_of_water_due_to_advection lwe_thickness_of_atmosphere_water_vapor_content becomes lwe_thickness_of_atmosphere_mass_content_of_water_vapor cloud_liquid_water_content_of_atmosphere_layer becomes mass_content_of_cloud_liquid_water_in_atmosphere_layer cloud_ice_content_of_atmosphere_layer becomes mass_content_of_cloud_ice_in_atmosphere_layer cloud_condensed_water_content_of_atmosphere_layer becomes mass_content_of_cloud_condensed_water_in_atmosphere_layer change_over_time_in_atmosphere_water_content_due_to_advection becomes change_over_time_in_atmosphere_mass_content_of_water_due_to_advection atmosphere_water_content becomes atmosphere_mass_content_of_water atmosphere_sulfate_content becomes atmosphere_mass_content_of_sulfate atmosphere_
Re: [CF-metadata] new TEOS-10 standard names
Dear All, I think the point we're missing here is that the existing salinity Standard Name is a much broader term than the TEOS-10 recommendations, covering true practical salinity from conductivity measurements, other types of salinity measurement and salinity computed by a whole host of numerical model algorithms. This has been connected with the PSU units of measure, which is sometimes right and sometimes wrong. However, it is widespread in legacy data stock. It is therefore something that should be recognised for what it is warts and all and left alone. Renaming it 'practical salinity' would be a bad move because it would change the semantic labelling of some datasets from imprecise to precise but wrong. I think the way forward would be to generate additional Standard Names for Practical Salinity and Absolute Salinity supported by TEOS-10 definitions, which can be semantically mapped as narrowMatches to the existing salinity, to give us the ability to label things properly from now on. It would be down to those holding data in CF to replace 'salinity' with the appropriate more precise term from the TEOS-10 recommendations. I would also support the creation of new Standard Names for the other TEOS-10 variables (temperature plus derived parameters) under the watchful eye of Trevor and TEOS-10. Again these can be mapped to existing less precise terms as appropriate. Now is our chance to get this right. Finally, can I draw peoples' attention to the statement on the TEOS-10 Web Site that data centres should continue to ingest and store salinity observations as Practical Salinity. It is abundantly clear from a number of conversations I have had recently that this is being overlooked. Cheers, Roy. From: cf-metadata-boun...@cgd.ucar.edu [cf-metadata-boun...@cgd.ucar.edu] On Behalf Of trevor.mcdoug...@csiro.au [trevor.mcdoug...@csiro.au] Sent: 21 July 2011 11:29 To: ngalbra...@whoi.edu; CF-metadata@cgd.ucar.edu; paul.dur...@csiro.au; paul.bar...@csiro.au; rainer.feis...@io-warnemuende.de; r...@eos.ubc.ca; King, Brian A. Subject: [CF-metadata] new TEOS-10 standard names Dear Nan et al., I want to weigh in to this discussion, as chair of SCOR/IAPSO Working Group 127. In June 2009 the Intergovernmental Oceanographic Commission, which is comprised of 146 nations, adopted TEOS-10 as the formal definition of seawater properties (and of ice and of humid air). Part of TEOS-10 is the adoption of Absolute Salinity as the salinity variable which replaces Practical Salinity as the salinity argument for the algorithms that calculate density etc. Because of the proliferation of different types of salinity, it is particularly important that the single word "Salinity" not be used henceforth. Rather, "Practical Salinity" should be used for Practical Salinity (not "Salinity"), and Absolute Salinity should be referred to as "Absolute Salinity" (not "Salinity"). The symbols S_P and S_A should be used, and the use of S should be discontinued immediately. This is outlined in the attached Announcement which will shortly appear in 21 oceanographic journals. This Announcement specifically requests editors and authors to use S_P and S_A, not S. The aim of this recommendation is to minimize the potential for confusion. We in WG127 have met with representatives of instrument manufacturers and they will be providing output from their software in the above manner. That is, they will discontinue the use of "Salinity" and of "S". I note that a team of four people have recently installed TEOS-10 into MOM4, and so we now have Absolute Salinity S_A and Preformed Salinity, S_star, in MOM4. So this naming convention is actually already an issue in the ocean modelling world. In the same vein, ocean models should not carry a variable called "temperature" but rather should carry either "potential temperature" or "Conservative Temperature" or both. It is clear that we are now on the cusp of a transition in oceanography, with the potential for confusion unless we are all very careful in correctly labeling our variables. I hope this discussion of the thinking of SCOR/IAPSO WG127 helps your community with the naming conventions for ocean and climate models, With best wishes, Trevor PS. As for some definitions, I would suggest something along the lines of sea_water_Practical_Salinity: Definition: Salinity measured on the Practical Salinity Scale of 1978 (PSS-78), which is based on measurements of the electrical conductivity of seawater. sea_water_Absolute_Salinity: Definition: The mass fraction of dissolved material in seawater as defined by the Thermodynamic Equation Of Seawater - 2010 (TEOS-10). Absolute Salinity incorporates the spatial variations in the composition of seawater. This type of absolute salinity is also called "Density Salinity". Note that I
