Dear Seth, All, No further comments have been received in this thread over the last two weeks. Therefore I think we should regard the discussion as closed.
The new name: atmosphere_convective_available_potential_energy_wrt_surface (J kg-1) is accepted for inclusion in the standard name table and will be added at the next update. The existing name atmosphere_specific_convective_available_potential_energy will be made an alias of atmosphere_convective_available_potential_energy (J kg-1). This change will also be made at the next update. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/British Atmospheric Data Centre Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. > -----Original Message----- > From: CF-metadata [mailto:[email protected]] On Behalf > Of [email protected] > Sent: 12 November 2013 14:44 > To: [email protected] > Subject: Re: [CF-metadata] new standard names for CIN, LFC,LCL; update to > CAPE > > Dear Seth, > > > > > I still have not found any datasets using the existing name > > atmosphere_specific_convective_available_potential_energy, so I suspect > > that it doesn't actually matter which way it is aliased. > > > > Thanks for researching this. Looking back through our numbered versions of > the standard name table I see that the original name has been around > since version 1 which means that it existed before the creation of the > current CF website and pre-dates my own involvement with CF. It is > therefore quite surprising that no one seems to have used it! Perhaps it was > part of a list of names originating from when the CF standard was under > development. > > > > > I stated the argument for aliasing it to (7) rather than (8) in the > > previous argument, but I don't feel strongly about it, and would be > > happy with either. If we haven't had any discussion from the list in, > > say, two weeks, could we consider it resolved? > > Just to remind everyone, you are suggesting that we make > atmosphere_specific_convective_available_potential_energy an alias of > atmosphere_convective_available_potential_energy (J kg-1). This is defined > as: > 'Convective(ly) available potential energy (often abbreviated CAPE) is a > stability measure calculated by integrating the positive temperature > difference between the surrounding atmosphere and a parcel of air lifted > adiabatically from a given starting height to its equilibrium level. A > coordinate variable of original_air_pressure_of_lifted_parcel should be > specified to indicate the starting height of the lifted parcel. CAPE exists > under conditions of potential instability, and measures the potential energy > per unit mass that would be released by the unstable parcel if it were able > to convect upwards to equilibrium.' > > The alternative would be to make the existing name an alias of > atmosphere_convective_available_potential_energy_wrt_surface (J kg-1) > and defined as: > 'Convective(ly) available potential energy (often abbreviated CAPE) is a > stability measure calculated by integrating the positive temperature > difference between the surrounding atmosphere and a parcel of air lifted > adiabatically from the surface to its equilibrium level. CAPE exists under > conditions of potential instability, and measures the potential energy per > unit mass that would be released by the unstable parcel if it were able to > convect upwards to equilibrium.' > > I agree that of the two new proposals, the first does sound more generic > and therefore closer to the existing name. Indeed there would be nothing > to stop someone from providing a value for > original_air_pressure_of_lifted_parcel that was actually the surface air > pressure so atmosphere_convective_available_potential_energy could be > used to describe any CAPE variable. > > I agree with your suggestion of allowing two weeks for comments. If no > further comments are received by that time then, yes, the issue is resolved. > > Best wishes, > Alison > > ------ > Alison Pamment Tel: +44 1235 778065 > NCAS/British Atmospheric Data Centre Email: [email protected] > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Oxford, Didcot, OX11 0QX, U.K. > > -- > Scanned by iCritical. > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- Scanned by iCritical. _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
