[CF-metadata] Wave periods sub-proposal

Elodie Fernandez elodie.fernandez at mercator-ocean.fr
Tue Mar 21 08:31:07 MDT 2017


Dear all,

Thank you Alison for all your work on our wave proposal, and thanks for
postponing the table update.
I agree with all of your suggestions, for updated definitions and new
names.

Regards,
Elodie

On 16/03/2017 16:57, alison.pamment at stfc.ac.uk wrote:
>
> Dear Stephane,
>
>  
>
> Thanks for getting back to me. I agree it would be useful if Elodie
> can review the names. As these are the only ones currently marked as
> ‘Accepted’ I will postpone the update for a few days. (This will also
> give me time to queue up some more names for publication).
>
>  
>
> Best wishes,
>
> Alison
>
>  
>
> ------
>
> Alison Pamment                                
>                       Tel: +44 1235 778065
>
> Centre for Environmental Data Analysis         Email:
> alison.pamment at stfc.ac.uk <mailto:J.A.Pamment at rl.ac.uk>
>
> STFC Rutherford Appleton Laboratory    
>
> R25, 2.22
>
> Harwell Campus, Didcot, OX11 0QX, U.K.
>
>  
>
>  
>
> *From:*Stephane TAROT [mailto:Stephane.Tarot at ifremer.fr]
> *Sent:* 14 March 2017 09:49
> *To:* Pamment, Alison (STFC,RAL,RALSP); rkl at bodc.ac.uk;
> elodie.fernandez at mercator-ocean.fr; cf-metadata at cgd.ucar.edu
> *Cc:* mar at puertos.es
> *Subject:* Re: Wave periods sub-proposal
>
>  
>
> Dear Alison,
>
> Thank you for your work on these wave parameters.
>
> >From my point of view, your proposal is fine. But I also would like
> to have the feedback from Elodie on them. Unfortunately, she's on
> vacation at the moment. I tried to check with other people from
> Mercator but they said she is the key person on this subject. She'll
> be back next monday (20th) which is also the date you mentioned for
> the next CF list update.
>
> I know I rushed you on this subject last week, but is it now possible
> to slow down a little, and to postpone the update for 1 or 2 days, in
> order to have her feedback before ?
>
>
> Best regards
>
> Stéphane Tarot
>
> Le 13/03/2017 à 15:19, alison.pamment at stfc.ac.uk
> <mailto:alison.pamment at stfc.ac.uk> a écrit :
>
>     Dear Roy,
>
>      
>
>     Thank you for getting back to me about the two sets of wave names.
>     I’m pleased to hear they look okay! I will wait a few days to see
>     if anyone wishes to comment further, but unless I receive any
>     objections during the next week my intention is to accept all the
>     remaining wave names and include them in the next update.
>
>      
>
>     Improved definitions (provided they are corrections/clarifications
>     and don’t change the intended meaning of the names) are always
>     welcome. Thank you to you and all those who have contributed so
>     far to improving and standardising the wave names.
>
>      
>
>     Best wishes,
>
>     Alison
>
>      
>
>     ------
>
>     Alison Pamment                                
>                           Tel: +44 1235 778065
>
>     Centre for Environmental Data Analysis         Email:
>     alison.pamment at stfc.ac.uk <mailto:J.A.Pamment at rl.ac.uk>
>
>     STFC Rutherford Appleton Laboratory    
>
>     R25, 2.22
>
>     Harwell Campus, Didcot, OX11 0QX, U.K.
>
>      
>
>      
>
>     *From:*Lowry, Roy K. [mailto:rkl at bodc.ac.uk]
>     *Sent:* 12 March 2017 15:38
>     *To:* Pamment, Alison (STFC,RAL,RALSP);
>     elodie.fernandez at mercator-ocean.fr
>     <mailto:elodie.fernandez at mercator-ocean.fr>;
>     Stephane.Tarot at ifremer.fr <mailto:Stephane.Tarot at ifremer.fr>;
>     cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>
>     *Cc:* mar at puertos.es <mailto:mar at puertos.es>
>     *Subject:* Re: Wave periods sub-proposal
>
>      
>
>     Dear Alison,
>
>      
>
>     I've now looked at your suggestions for this sub-proposal and find
>     them all acceptable.
>
>      
>
>     There is an action on me to consult with wave experts to see if
>     improved definitions for the wave types (e.g. wind and swell) can
>     be prepared once the work on Elodie's proposals is complete.
>
>      
>
>     Cheers, Roy.
>
>      
>
>     Please note that I partially retired on 01/11/2015. I am now only
>     working 7.5 hours a week and can only guarantee e-mail response on
>     Wednesdays, my day in the office. All vocabulary queries should be
>     sent to enquiries at bodc.ac.uk <mailto:enquiries at bodc.ac.uk>. Please
>     also use this e-mail if your requirement is urgent.
>
>      
>
>     ------------------------------------------------------------------------
>
>     *From:*alison.pamment at stfc.ac.uk
>     <mailto:alison.pamment at stfc.ac.uk> <alison.pamment at stfc.ac.uk
>     <mailto:alison.pamment at stfc.ac.uk>>
>     *Sent:* 11 March 2017 12:49
>     *To:* Lowry, Roy K.; elodie.fernandez at mercator-ocean.fr
>     <mailto:elodie.fernandez at mercator-ocean.fr>;
>     Stephane.Tarot at ifremer.fr <mailto:Stephane.Tarot at ifremer.fr>;
>     cf-metadata at cgd.ucar.edu <mailto:cf-metadata at cgd.ucar.edu>
>     *Cc:* mar at puertos.es <mailto:mar at puertos.es>
>     *Subject:* RE: Wave periods sub-proposal
>
>      
>
>     Dear Roy, Elodie, Stephane, et al,
>
>     My detailed comments on the wave period sub-proposal names are
>     given below. I have accepted the three proposals for new aliases
>     with very minor tweaks to the definitions. I have also accepted
>     several of the proposed new names. Please could you check the
>     definitions of the last two new names - if you are happy with them
>     then these names can also be accepted.
>
>     As with the wave direction, energy and steepness names any changes
>     agreed by 20th March will be included in the next standard name
>     table update.
>
>     A summary of all the wave names currently accepted (and not yet
>     published) or still under discussion can be found at:
>     http://cfeditor.ceda.ac.uk/proposals/1?status=active&namefilter=&proposerfilter=elodie&descfilter=&unitfilter=&yearfilter=&commentfilter=&filter+and+display=Filter.
>
>     ---
>
>     > All wave periods have Canonical Units of seconds.
>     >
>     >
>     > Existing Standard Name Changes
>     >
>     > Justification for change:
>     > 
>     > The classical Tucker-Draper analysis specifies multiple wave
>     period statistics such as zero-upcrossing period (Tz) and crest
>     period (Tc) and the protocols used could cause
>     > these to differ. However, wave theory states that period of a
>     waveform should be uniform for all reference points on the
>     waveform and so the possibility of variation
>     > should be considered an artefact and the geophysical variable
>     should simply be wave period. The long name can be used if
>     required to specify the waveform reference
>     > and measurement protocol used, as proposed for wave height
>     Standard Names.
>     >
>     > 1. sea_surface_wave_zero_upcrossing_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. The zero upcrossing period is defined as the time
>     interval between consecutive occasions on which the
>     > surface height passes upward above the mean level.
>     >  
>     > Replace this by:
>     > sea_surface_wave_mean_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.
>
>     This proposed alias looks fine and, as with the existing wave
>     height names, I think it is a sensible approach to use the long
>     name to indicate the precise method by which the data values were
>     obtained. The proposed definition seems general enough to cover
>     all eventualities. In the last sentence "average period" should
>     say "mean period" (consistent with the wave height names).
>
>     This alias is accepted for inclusion in the standard name table.
>
>     > 2. sea_surface_wind_wave_zero_upcrossing_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. The zero upcrossing period is defined as the time
>     interval between consecutive occasions on which the
>     > surface height passes upward above the mean level. Wind waves
>     are waves on the ocean surface. Wind is defined as a
>     two-dimensional (horizontal) air velocity vector,
>     > with no vertical component. (Vertical motion in the atmosphere
>     has the standard name upward_air_velocity.)
>     >  
>     > Replace this by:       
>     > sea_surface_wind_wave_mean_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.  Wind
>     waves are the high frequency portion
>     > of a bimodal wave frequency distribution.
>
>     As with proposal 1, in the penultimate sentence of the definition
>     "average period" should be replaced by "mean period" (consistent
>     with the wave height names). Otherwise this looks fine.
>
>     This alias is accepted for inclusion in the standard name table.
>
>     > 3. sea_surface_swell_wave_zero_upcrossing_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. The zero upcrossing period is defined as the time
>     interval between consecutive occasions on which the
>     > surface height passes upward above the mean level. Swell waves
>     are waves on the ocean surface.
>     >  
>     > Replace this by:
>     > sea_surface_swell_wave_mean_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.  Swell
>     waves are the low frequency portion
>     > of a bimodal wave frequency distribution.
>
>     As with proposal 1, in the penultimate sentence of the definition
>     "average period" should be replaced by "mean period" (consistent
>     with the wave height names). Otherwise this looks fine.
>
>     This alias is accepted for inclusion in the standard name table.
>
>     ---
>
>     > Additional Standard Names for Copernicus Proposal
>     >
>     > 1. sea_surface_wave_significant_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Significant wave
>     period is a statistic computed from wave measurements and
>     corresponds to the average wave period of the
>     > highest one third of the waves.
>
>     Units of s is fine and the proposed name is consistent with the
>     existing name sea_surface_wave_significant_height.
>
>     For consistency with the accepted aliases and existing wave height
>     names "average period" in the definition should be replaced by
>     "mean period". Taking account of Nan's suggestion to change the
>     order of the sentences in the definition we would then have:
>
>     'Significant wave period is a statistic computed from wave
>     measurements and corresponds to the mean wave period of the
>     highest one third of the waves. A period is an interval of time,
>     or the time-period of an oscillation. Wave period is the interval
>     of time between repeated features on the waveform such as crests,
>     troughs or upward passes through the mean level.'
>
>     With these cosmetic changes this new name is accepted for
>     publication in the standard name table.
>
>     > 2. sea_surface_wave_mean_period_of_highest_tenth
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.  Mean
>     period of the highest tenth is the
>     > average period of the highest one-tenth of the waves during the
>     observation duration.
>
>     Units of s is fine. The proposed name and definition are
>     consistent with the existing name
>     sea_surface_wave_mean_height_of_highest_tenth.
>
>     Again, replacing "average period" with "mean period" and changing
>     the order of sentences in the definition we would have:
>     'Wave mean period is the mean period measured over the observation
>     duration.  Mean period of the highest tenth is the mean period of
>     the highest one-tenth of the waves during the observation
>     duration. A period is an interval of time, or the time-period of
>     an oscillation. Wave period is the interval of time between
>     repeated features on the waveform such as crests, troughs or
>     upward passes through the mean level.'
>
>     With these cosmetic changes this new name is accepted for
>     publication in the standard name table.
>
>     > 3. sea_surface_wave_maximum_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level. The maximum period is
>     the longest wave period measured during the observation period.
>
>     Units of s is fine. The proposal is consistent with existing wave
>     maximum height/depth names.
>
>     Changing the order of the sentences in the definition as suggested
>     by Nan we would have:
>     'The maximum wave period is the longest wave period measured
>     during the observation period. A period is an interval of time, or
>     the time-period of an oscillation. Wave period is the interval of
>     time between repeated features on the waveform such as crests,
>     troughs or upward passes through the mean level.'
>
>     With this cosmetic change this new name is accepted for
>     publication in the standard name table.
>
>     > 4. sea_surface_wave_period_of_highest_wave
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level. Wave period of the
>     highest wave is the period determined from wave crests
>     corresponding to the greatest vertical distance
>     > above mean level during the observation period.
>
>     Units of s is fine. The name itself looks fine.
>
>     Changing the order of the sentences in the definition as suggested
>     by Nan we would have:
>     'Wave period of the highest wave is the period determined from
>     wave crests corresponding to the greatest vertical distance above
>     mean level during the observation period. A period is an interval
>     of time, or the time-period of an oscillation. Wave period is the
>     interval of time between repeated features on the waveform such as
>     crests, troughs or upward passes through the mean level.'
>
>     With this cosmetic change this new name is accepted for
>     publication in the standard name table.
>
>     > 5. sea_surface_primary_swell_wave_mean_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.   The
>     primary swell wave is the most
>     > energetic wave in the low frequency portion of a bimodal wave
>     frequency distribution.
>
>     Units of s is fine. The proposed name is consistent with the
>     syntax of existing names and proposed wave direction names.
>
>     Changing the order of the sentences in the definition as suggested
>     by Nan, replacing "average period" with "mean period", and making
>     the wording consistent with the proposed name
>     sea_surface_primary_swell_wave_from_direction, the definition can
>     be written as follows:
>
>     'The quantity with standard name
>     sea_surface_primary_swell_wave_mean_period is the mean period of
>     the most energetic swell waves. Swell waves are waves on the ocean
>     surface and are in the low frequency portion of a bimodal wave
>     frequency spectrum. The primary swell wave is the most energetic
>     swell wave. A period is an interval of time, or the time-period of
>     an oscillation. Wave period is the interval of time between
>     repeated features on the waveform such as crests, troughs or
>     upward passes through the mean level. Wave mean period is the
>     average period measured over the observation duration.
>
>     OK?
>
>     > 6. sea_surface_secondary_swell_wave_mean_period
>     > A period is an interval of time, or the time-period of an
>     oscillation. Wave period is the interval of time between repeated
>     features on the waveform such as crests, troughs
>     > or upward passes through the mean level.  Wave mean period is
>     the average period measured over the observation duration.  The
>     secondary swell wave is the second
>     > most energetic wave in the low frequency portion of a bimodal
>     wave frequency distribution.
>
>     Units of s is fine. The proposed name is consistent with the
>     syntax of existing names and proposed wave direction names.
>
>     Changing the order of the sentences in the definition as suggested
>     by Nan, replacing "average period" with "mean period", and making
>     the wording consistent with the proposed name
>     sea_surface_secondary_swell_wave_from_direction, the definition
>     can be written as follows:
>
>     'The quantity with standard name
>     sea_surface_secondary_swell_wave_mean_period is the mean period of
>     the second most energetic swell waves. Swell waves are waves on
>     the ocean surface and are in the low frequency portion of a
>     bimodal wave frequency spectrum. The secondary swell wave is the
>     second most energetic wave in the low frequency portion of a
>     bimodal wave frequency spectrum. A period is an interval of time,
>     or the time-period of an oscillation. Wave period is the interval
>     of time between repeated features on the waveform such as crests,
>     troughs or upward passes through the mean level. Wave mean period
>     is the average period measured over the observation duration.'
>
>     OK?
>
>     ---
>
>     Best wishes,
>     Alison
>
>      ------
>     Alison
>     Pamment                                                       Tel:
>     +44 1235 778065
>     Centre for Environmental Data Analysis         Email:
>     alison.pamment at stfc.ac.uk <mailto:alison.pamment at stfc.ac.uk>
>     STFC Rutherford Appleton Laboratory    
>     R25, 2.22
>     Harwell Campus, Didcot, OX11 0QX, U.K.
>
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