Dear Andy
Thanks for these proposals.
> charnock_coefficient_for_surface_roughness_length_for_momentum_in_air
> sea_surface_wave_mean_square_slope
are consistent with existing names and look fine to me.
I don't quite understand these ones.
> magnitude_of_sea_surface_wave_[xy]_mean_square_slope
You are considering the slopes in the x- and y-directions separately i.e.
deta/dx and deta/y, where eta is sea surface height. Maybe _[xy]_slope would
be clearer, if that's right. If it's a mean square, it surely must be positive,
mustn't it? If so, I don't see why it needs magnitude_of.
Best wishes
Jonathan
----- Forwarded message from "Saulter, Andrew" <andrew.saulter at metoffice.gov.uk> -----
> Date: Fri, 14 Sep 2018 12:20:57 +0000
> From: "Saulter, Andrew" <andrew.saulter at metoffice.gov.uk>
> To: "cf-metadata at cgd.ucar.edu" <cf-metadata at cgd.ucar.edu>
> Subject: [CF-metadata] standard names for sea surface roughness variables
>
> Hello everyone, hope you are all well.
>
> I'd like to propose some new standard names for variables relating to sea surface roughness please. The v0 suggestions are:
>
> charnock_coefficient_for_surface_roughness_length_for_momentum_in_air
> Units: 1
> Coefficient value, based on the Charnock (1955) empirical expression for deriving surface_roughness_length_for_momentum_in_air over the ocean. The surface called "surface" means the lower boundary of the atmosphere.
>
> [Not for description text, but see also http://glossary.ametsoc.org/wiki/Charnock%27s_relation]
>
>
> sea_surface_wave_mean_square_slope
> Units: 1
> Wave slope describes an aspect of sea surface wave geometry related to sea surface roughness. Mean square slope describes a derivation over multiple waves within a sea-state, for example calculated from moments of the wave directional spectrum.
>
> magnitude_of_sea_surface_wave_x_mean_square_slope
> Units: 1
> Wave slope describes an aspect of sea surface wave geometry related to sea surface roughness. Mean square slope describes a derivation over multiple waves within a sea-state, for example calculated from moments of the wave directional spectrum. Magnitude of "x" indicates that slope values are derived from vector components along the grid x-axis, with slope always taking a positive value.
>
> magnitude_of_sea_surface_wave_y_mean_square_slope
> Units: 1
> Wave slope describes an aspect of sea surface wave geometry related to sea surface roughness. Mean square slope describes a derivation over multiple waves within a sea-state, for example calculated from moments of the wave directional spectrum. Magnitude of "y" indicates that slope values are derived from vector components along the grid y-axis, with slope always taking a positive value.
>
> [My main concern with these latter variables, is the use of magnitude and vector x/y descriptors. Hopefully the descriptive text explains this OK; basically a negative slope makes no sense in the context in which the data are derived and used, i.e. for surface roughness estimation]
>
> Will look forward to the comments :)
> 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
> andrew.saulter at metoffice.gov.uk http://www.metoffice.gov.uk
>
>
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----- End forwarded message -----
Received on Wed Sep 19 2018 - 08:49:44 BST
