Dear Helen and Andy I noticed the sea_surface_height_amplitude_due_to_X_tide names as well, and I wondered, what does "amplitude" mean here? The definitions of these names don't say, and I feel that we should be clear. I guessed it might mean the amplitude of SSH due to the tidal cycle, whereas I think Andy means the actual tidal height as a function of time. Are you able to clarify?
It's a good point about due_to_air_pressure[_and_wind], thanks. That may not obviously mean "storm surge", which maybe could be inserted in the definition. Best wishes Jonathan ----- Forwarded message from "Snaith, Helen M." <[email protected]> ----- > Date: Tue, 10 Apr 2018 13:14:16 +0000 > From: "Snaith, Helen M." <[email protected]> > To: "Saulter, Andrew" <[email protected]> > CC: "[email protected]" <[email protected]> > Subject: Re: [CF-metadata] proposed new standard name for storm surge > residual > x-mailer: Apple Mail (2.3445.6.18) > > Hi Andy > > Many of the sea_surface_height terms have been used in satellite altimetry > for some time. > The tidal components have been split out into > sea_surface_height_amplitude_due_to_equilibrium_ocean_tide<javascript:void(0)> > sea_surface_height_amplitude_due_to_geocentric_ocean_tide<javascript:void(0)> > sea_surface_height_amplitude_due_to_non_equilibrium_ocean_tide<javascript:void(0)> > > And the pole tide > sea_surface_height_amplitude_due_to_pole_tide<javascript:void(0)> > > In these terms, amplitude has been used to identify the ‘above mean level’ > and sea_surface_height is as alias of sea_surface_heigth_above_mean_sea_level > > > Also included are the terms > sea_surface_height_correction_due_to_air_pressure_and_wind_at_high_frequency<javascript:void(0)> > sea_surface_height_correction_due_to_air_pressure_at_low_frequency<javascript:void(0)> > > The former of which is related to surge I think - it is normally determined > from a tidal model and is the response of sea level to changes in air > pressure and wind. > > Even if these are not the correct terms, as you are not determining a > 'correction’ but a value - they should be related to the surge components, so > do they give the ‘due to’ component you need? > > Helen > > > On 4 Apr 2018, at 17:13, Saulter, Andrew > <[email protected]<mailto:[email protected]>> > wrote: > > Dear all, > > First posting to this list, so please forgive me if I’m doing it wrong… > > I’d like to request an addition to the standard name list to include storm > surge residual and tide. These variables are generated for the purpose of > coastal flood prediction and will be available in future, netCDF based, > operational products from the Met Office. > > Proposed standard name: > sea_surface_height_above_mean_sea_level_due_to_storm_surge > 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 specification of a physical > process by the phrase “due_to_process” means that the quantity named is a > single term in a sum of terms which together compose the general quantity > named by omitting the phrase. Storm surge effects, due to meteorological > forcing of the ocean and interaction between the generated surge and tides, > are a significant contributor to the observed sea surface height. > > Proposed standard name: sea_surface_height_above_mean_sea_level_due_to_tide > 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 specification of a physical > process by the phrase “due_to_process” means that the quantity named is a > single term in a sum of terms which together compose the general quantity > named by omitting the phrase. Tides are a significant contributor to the > observed sea surface height; here “tide” denotes a generic variable > describing the time varying tidal signal, for example as generated based on a > summation of harmonically analysed components, or resulting from the > application of such components as boundary conditions to a numerical tidal > model. > > Many thanks > Andy > > > Andy Saulter > Surge, Waves and Metocean Projects Manager > Met Office FitzRoy Road Exeter Devon EX1 3PB > Tel: +44 (0)1392 884703 Fax: +44 (0)1392 885681 > [email protected]<mailto:[email protected]> > http://www.metoffice.gov.uk<http://www.metoffice.gov.uk/> > > > -- > This message has been scanned for viruses and > dangerous content by MailScanner<http://www.mailscanner.info/>, and is > believed to be clean. _______________________________________________ > CF-metadata mailing list > [email protected]<mailto:[email protected]> > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > ________________________________ > This message (and any attachments) is for the recipient only. 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