[CF-metadata] standard names for sea surface roughness variables

From: Jonathan Gregory <j.m.gregory>
Date: Fri, 28 Sep 2018 13:45:48 +0100

Dear Andy

> Re the direction of the _mean_square_slope, the parameter and calculation method from the wave spectrum is sufficiently different from that for _wave_[to/from]_direction that it should stand alone. There has already been a precedent set for this with waves, where different forms of parameter calculation from the spectrum are given their own names because there is not only a calculation difference but a different physical interpretation of each parameter (e.g. the various type of wave period).

OK, fair enough. So you need sea_surface_wave_mean_square_slope_to_direction.

I'm still stuck with what this "direction" really is. Can we insert anything
else for ? in
  sea_surface_wave_mean_square_slope_along_?_direction
  sea_surface_wave_mean_square_slope_across_?_direction
Apparently you want to quantify the mean square slope along and across the
direction of the mean square slope. Is that right? I'm not sure what it means.
Without the "mean square", I'd think that the slope normal to the direction of
the slope must be zero, but it must be more subtle than that in this case!

Is there really an ambiguity of to/from with a mean square slope? It seems to
me that it must be the same (unsigned) number regardless of whether you go
backwards or forwards on a particular direction.

Is Devon up or down from Cornwall?

Best wishes

Jonathan
Received on Fri Sep 28 2018 - 06:45:48 BST