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, [email protected] 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: > [email protected] <mailto:[email protected]> > > STFC Rutherford Appleton Laboratory > > R25, 2.22 > > Harwell Campus, Didcot, OX11 0QX, U.K. > > > > > > *From:*Stephane TAROT [mailto:[email protected]] > *Sent:* 14 March 2017 09:49 > *To:* Pamment, Alison (STFC,RAL,RALSP); [email protected]; > [email protected]; [email protected] > *Cc:* [email protected] > *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, [email protected] > <mailto:[email protected]> 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: > [email protected] <mailto:[email protected]> > > STFC Rutherford Appleton Laboratory > > R25, 2.22 > > Harwell Campus, Didcot, OX11 0QX, U.K. > > > > > > *From:*Lowry, Roy K. [mailto:[email protected]] > *Sent:* 12 March 2017 15:38 > *To:* Pamment, Alison (STFC,RAL,RALSP); > [email protected] > <mailto:[email protected]>; > [email protected] <mailto:[email protected]>; > [email protected] <mailto:[email protected]> > *Cc:* [email protected] <mailto:[email protected]> > *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 [email protected] <mailto:[email protected]>. Please > also use this e-mail if your requirement is urgent. > > > > ------------------------------------------------------------------------ > > *From:*[email protected] > <mailto:[email protected]> <[email protected] > <mailto:[email protected]>> > *Sent:* 11 March 2017 12:49 > *To:* Lowry, Roy K.; [email protected] > <mailto:[email protected]>; > [email protected] <mailto:[email protected]>; > [email protected] <mailto:[email protected]> > *Cc:* [email protected] <mailto:[email protected]> > *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: > [email protected] <mailto:[email protected]> > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Campus, Didcot, OX11 0QX, U.K. > > ------------------------------------------------------------------------ > > This message (and any attachments) is for the recipient only. NERC > is subject to the Freedom of Information Act 2000 and the contents > of this email and any reply you make may be disclosed by NERC > unless it is exempt from release under the Act. 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