This all looks great,
Thanks all!
-CHB
On Wed, Jun 22, 2016 at 6:32 AM, <alison.pamment at stfc.ac.uk> wrote:
> Dear Roy, Elodie, Nan, Jonathan, Chris, et al,
>
>
>
> Many thanks to Elodie for her original wave name proposals, to Roy for
> doing so much work on designing a systematic approach to CF wave names and
> to all those who have worked to improve these proposals on and off the
> list. My apologies for taking a while to respond to this discussion.
>
>
>
> I think it is useful to continue Roy?s approach of breaking the original
> set of proposals into three groups, so here I will address just the height
> names. I will address the other sets of proposals separately.
>
>
>
> I note the discussion around the use of mean, maximum and minimum in the
> standard name, rather than our more usual approach of placing such
> information in the cell_methods attribute. We do already have eleven
> existing names that refer to ?wave_mean_period?. I looked back at the
> original discussion of these names in 2006 in which it was agreed to use
> ?mean? in the name because wave quantities can be calculated in many and
> diverse ways from the power spectrum and it is not useful to come up with
> separate cell_methods for them all. I think Roy made a similar point
> earlier on in this discussion. In fact, I don?t think that putting the
> quantities in cell_methods would greatly reduce the number of new names
> required in this instance. Also, I?m strongly in favour of Roy?s approach
> of adopting as far as possible a consistent convention for all wave
> standard names so I support the use of mean, maximum and minimum in these
> proposals for consistency with the existing names.
>
>
>
> I note the general point made by Nan about the ordering of sentences in
> the definitions of new wave names (
> http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2016/058843.html). I?m
> broadly supportive of adopting this approach as we go along (so this
> doesn?t mean we need to review all existing wave name definitions during
> the current discussion). I think the definitions of the wave height
> proposals are in any case consistent with Nan?s approach.
>
>
>
> For the two mean_height names, I suggest a minor change in which we
> replace the word ?average? in the definitions with the word ?mean? for
> clarity and consistency with the names themselves, otherwise they look
> fine. These two names would therefore be as follows:
>
> sea_surface_wave_mean_height (m)
>
> ?Wave height is defined as the vertical distance from a wave trough to the
> following wave crest. The mean wave height is the mean trough to crest
> distance measured during the observation period.?
>
> sea_surface_wave_mean_height_of_highest_tenth (m)
>
> ?Wave height is defined as the vertical distance from a wave trough to the
> following wave crest. The height of the highest tenth is defined as the
> mean of the highest ten per cent of trough to crest distances measured
> during the observation period.?
>
> If Roy and Elodie are happy with this small change, then these names can
> be accepted for publication.
>
>
>
> The remaining height names look fine and are accepted for publication in
> the standard name table:
>
>
>
> sea_surface_wave_significant_height (m) (Modification to definition of
> existing name)
>
> ?Significant wave height is a statistic computed from wave measurements
> and corresponds to the average height of the highest one third of the
> waves, where the height is defined as the vertical distance from a wave
> trough to the following wave crest.?
>
>
>
> sea_surface_wind_wave_significant_height (m) (Modification to definition
> of existing name)
>
> ?Wind waves are waves on the ocean surface and are the high frequency
> portion of a bimodal wave frequency spectrum. Significant wave height is a
> statistic computed from wave measurements and corresponds to the average
> height of the highest one third of the waves, where the height is defined
> as the vertical distance from a wave trough to the following wave crest.?
>
>
>
> sea_surface_swell_wave_significant_height (m) (Modification to definition
> of existing name)
>
> ?Swell waves are waves on the ocean surface and are the low frequency
> portion of a bimodal wave frequency spectrum. Significant wave height is a
> statistic computed from wave measurements and corresponds to the average
> height of the highest one third of the waves, where the height is defined
> as the vertical distance from a wave trough to the following wave crest.?
>
>
>
> sea_surface_primary_swell_wave_significant_height (m)
>
> ?Swell waves are waves on the ocean surface and are the low frequency
> portion of a bimodal wave frequency spectrum. The primary swell wave is the
> most energetic swell wave. Significant wave height is a statistic computed
> from wave measurements and corresponds to the average height of the highest
> one third of the waves, where the height is defined as the vertical
> distance from a wave trough to the following wave crest.?
>
>
>
> sea_surface_secondary_swell_wave_significant_height (m)
>
> ?Swell waves are waves on the ocean surface and are 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. Significant wave height is a statistic computed
> from wave measurements and corresponds to the average height of the highest
> one third of the waves, where the height is defined as the vertical
> distance from a wave trough to the following wave crest.?
>
>
>
> sea_surface_wave_maximum_height (m)
>
> ?Wave height is defined as the vertical distance from a wave trough to the
> following wave crest. The maximum wave height is the greatest trough to
> crest distance measured during the observation period.?
>
>
>
> sea_surface_wave_maximum_crest_height (m)
>
> ?The crest is the highest point of a wave. Crest height is the vertical
> distance between the crest and the calm sea surface. Maximum crest height
> is the maximum value measured during the observation period.?
>
>
>
> sea_surface_wave_maximum_trough_depth (m)
>
> ?The trough is the lowest point of a wave. Trough depth is the vertical
> distance between the trough and the calm sea surface. Maximum trough depth
> is the maximum value measured during the observation period.?
>
>
>
> The current status of these names can also be viewed in the CEDA
> vocabulary editor:
> http://cfeditor.ceda.ac.uk/proposals/1?status=active&namefilter=height+trough&proposerfilter=Roy+Elodie&descfilter=&unitfilter=&yearfilter=&commentfilter=&filter+and+display=Filter
> .
>
>
>
> The next update of the standard name table will take place on 19th July.
>
>
>
> Best wishes,
>
> Alison
>
> ------
>
> Alison Pamment Tel: +44
> 1235 778065
>
> Centre for Environmental Data Analysis Email:
> alison.pamment at stfc.ac.uk <J.A.Pamment at rl.ac.uk>
>
> STFC Rutherford Appleton Laboratory
>
> R25, 2.22
>
> Harwell Campus, Didcot, OX11 0QX, U.K.
>
>
>
>
>
> *From:* CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] *On Behalf
> Of *Chris Barker
> *Sent:* 13 May 2016 17:13
> *To:* Nan Galbraith
> *Cc:* cf-metadata at cgd.ucar.edu
> *Subject:* Re: [CF-metadata] Waves
>
>
>
> On Wed, May 11, 2016 at 9:18 AM, Nan Galbraith <ngalbraith at whoi.edu>
> wrote:
>
> Significant wave height is a statistic computed from wave measurements
> and corresponds to the average height of the highest one third of the
> waves,
> where the height is defined as the vertical distance from a wave trough to
> the following wave crest.
>
>
>
> works for me.
>
>
>
> Thanks,
>
>
>
> -CHB
>
>
>
>
>
> --
>
>
> Christopher Barker, Ph.D.
> Oceanographer
>
> Emergency Response Division
> NOAA/NOS/OR&R (206) 526-6959 voice
> 7600 Sand Point Way NE (206) 526-6329 fax
> Seattle, WA 98115 (206) 526-6317 main reception
>
> Chris.Barker at noaa.gov
>
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>
>
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
Chris.Barker at noaa.gov
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