Dear Andy This looks good to me. Thanks for your persistence.
Best wishes Jonathan ----- Forwarded message from "Saulter, Andrew" <[email protected]> ----- > Date: Thu, 10 May 2018 09:31:11 +0000 > From: "Saulter, Andrew" <[email protected]> > To: "[email protected]" <[email protected]> > Subject: Re: [CF-metadata] proposed new standard name for storm surge > residual > > Dear Jonathon, > > Only did half a job with the LAT yesterday morning - sorry! The updated set > of names/descriptions is below: > > tidal_sea_surface_height_above_lowest_astronomical_tide > Units: m > "Sea surface height" is a time-varying quantity. "Height_above_X" means the > vertical distance above the named surface X. "Lowest astronomical tide" > describes a local vertical reference based on the lowest water level that can > be expected to occur under average meteorological conditions and under any > combination of astronomical conditions. The tidal component of sea surface > height describes the predicted variability of the sea surface due to > astronomic forcing (chiefly lunar and solar cycles) and shallow water > resonance of tidal components; for example as generated based on harmonic > analysis, or resulting from the application of harmonic tidal series as > boundary conditions to a numerical tidal model. > > non_tidal_elevation_of_sea_surface_height > Units: m > "Sea surface height" is a time-varying quantity. "Non_tidal_elevation" > describes the contribution to sea surface height variability made by > processes other than astronomic forcing of the ocean and shallow water > resonance of tidal components. These processes include storm surge (due to a > combination of meteorological forcing of the ocean and interaction between > the generated surge and tides), effects of surface ocean waves, and seasonal > and climatic variation in ocean density and circulation. The contribution > made by each process varies according to the averaging time of the variable > as described by the "bounds" and "cell_methods" attributes. > > For completeness the unchanged new name from yesterday is: > > tidal_sea_surface_height_above_mean_sea_level > Units: m > "Sea surface height" is a time-varying quantity. "Height_above_X" means the > vertical distance above the named surface X. "Mean sea level" means the time > mean of sea surface elevation at a given location over an arbitrary period > sufficient to eliminate the tidal signals. The tidal component of sea surface > height describes the predicted variability of the sea surface due to > astronomic forcing (chiefly lunar and solar cycles) and shallow water > resonance of tidal components; for example as generated based on harmonic > analysis, or resulting from the application of harmonic tidal series as > boundary conditions to a numerical tidal model. > > Many thanks > Andy > > > -----Original Message----- > From: CF-metadata [mailto:[email protected]] On Behalf Of > Jonathan Gregory > Sent: 09 May 2018 15:46 > To: [email protected] > Subject: Re: [CF-metadata] proposed new standard name for storm surge residual > > Dear Andy > > > tidal_sea_surface_height_above_lowest_astronomical_tide > > Units: m > > "Sea surface height" is a time-varying quantity. "Height_above_X" means the > > vertical distance above the named surface X. "Chart datum" describes a > > local vertical reference from which depths displayed on a nautical chart > > are measured and which differs from mean sea level. For example, chart > > datum based on "lowest astronomical tide" or "mean lower low water". The > > tidal component of sea surface height describes the predicted variability > > of the sea surface due to astronomic forcing (chiefly lunar and solar > > cycles) and shallow water resonance of tidal components; for example as > > generated based on harmonic analysis, or resulting from the application of > > harmonic tidal series as boundary conditions to a numerical tidal model. > > The definition above needs revision (simplification in fact) to remove "chart > datum". > > > non_tidal_elevation_of_sea_surface_height > > Units: m > > "Sea surface height" is a time-varying quantity. "Non_tidal_elevation" > > describes the contribution to sea surface height variability made by > > processes other than astronomic forcing of the ocean and shallow water > > resonance of tidal components. These processes include storm surge (due to > > a combination of meteorological forcing of the ocean and interaction > > between the generated surge and tides), background ocean circulation, > > steric changes in the water column and, at higher frequencies, effects of > > surface ocean waves. The contribution made by these processes varies > > according to the averaging time of the variable as described by the " > > bounds" and "cell_methods" attributes. > > I suggest, "These processes include storm surge (due to a combination of > meteorological forcing of the ocean and interaction between the generated > surge and tides), effects of surface ocean waves, and seasonal and climatic > variation in ocean density and circulation." > > Best wishes > > Jonathan > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ----- End forwarded message ----- _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
