Dear Andy
This looks good to me. Thanks for your persistence.
Best wishes
Jonathan
----- Forwarded message from "Saulter, Andrew" <andrew.saulter at metoffice.gov.uk> -----
> Date: Thu, 10 May 2018 09:31:11 +0000
> From: "Saulter, Andrew" <andrew.saulter at metoffice.gov.uk>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> 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:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of Jonathan Gregory
> Sent: 09 May 2018 15:46
> To: cf-metadata at cgd.ucar.edu
> 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
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
----- End forwarded message -----
Received on Thu May 10 2018 - 09:32:30 BST
