Dear Rob, Thanks for proposing this - as you say, it fills a gap and is consistent with the accompanying "_direction" variable.
So sounds good to me also. Cheers 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] http://www.metoffice.gov.uk From: CF-metadata <[email protected]> On Behalf Of Stephane TAROT Sent: 28 September 2018 09:57 To: [email protected] Subject: Re: [CF-metadata] Spectral wave direction spread parameter Dear Rob & all, We also need this new standard name. The proposed name sounds good. Best regards Stéphane Tarot Le 28/09/2018 à 09:47, Rob Thomas a écrit : Hi, Please can I propose/request a new standard name for the list: "sea_surface_wave_directional_spread_at_variance_spectral_density_maximum" The rationale for this request is that in assessing our mappings of spectral wave parameters to the CF standard names we have mapped "Peak Direction" (described as "Dirp Direction for waves at peak of wave energy spectrum from which the waves are coming") to "sea_surface_wave_from_direction_at_variance_spectral_density_maximum" with definition: The quantity with standard name sea_surface_wave_from_direction_at_variance_spectral_density_maximum is the direction from which the most energetic waves are coming. The spectral peak is the most energetic wave in the total wave spectrum. The phrase "from_direction" is used in the construction X_from_direction and indicates the direction from which the velocity vector of X is coming. The direction is a bearing in the usual geographical sense, measured positive clockwise from due north. The wave directional spectrum can be written as a five dimensional function S(t,x,y,f,theta) where t is time, x and y are horizontal coordinates (such as longitude and latitude), f is frequency and theta is direction. S has the standard name sea_surface_wave_directional_variance_spectral_density. S can be integrated over direction to give S1= integral(S dtheta) and this quantity has the standard name sea_surface_wave_variance_spectral_density. It does not appear there is an appropriate partner term for Peak Spread (described as "Dsprp Directional spread of waves at peak of wave energy spectrum") because the options currently available do not appear to tie in to the peak wave energy spectrum/spectral peak information. Kind regards, Rob Dr. Rob Thomas Senior Data Analyst - European Data Management Projects Team Leader Marine Institute, Rinville, Oranmore, County Galway, H91 R673, Ireland Tel: (+)353 (0)91 387 409 Mob: (+)353 (0)87 952 3467 Email: [email protected]<mailto:[email protected]> ORCID: 0000-0001-6068-4924 Web: http://data.marine.ie/ _______________________________________________ CF-metadata mailing list [email protected]<mailto:[email protected]> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
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