Hi all,
It seems that my question did not attract much response. :(
Is it because no one knows how to use these standard names and properly encode
the "quantity that differs from its surface value by a certain amount"?
Giving it more thoughts I feel that I need new standard names to describe this
properly.
Would it make sense to describe it this way:
float swtd ;
swtd:standard_name = "sea_water_temperature_difference_wrt_sea_surface" ;
swtd:units = "degC" ;
swtd:axis = "Z" ;
swtd:positive = "down" ;
swtd:long_name = "temperature difference wrt its surface value"
float omlt(t, j, i) ;
omlt:standard_name = "ocean_mixed_layer_thickness_defined_by_temperature" ;
omlt:units = "m" ;
omlt:coordinates = "time swtd1 latitude longitude" ;
omlt:long_name = "ocean mixed layer defined by difference of temperature
from surface"
and the scalar value swtd can be 0.5 degC, 1.0 degC, etc.
In this case, I need standard names working with temperature, sigma_theta and
sigma_t:
sea_water_temperature_difference_wrt_sea_surface
sigma_theta_difference_wrt_sea_surface
sigma_t_difference_wrt_sea_surface
any quick suggestions are very welcome!
thanks
/Sébastien
----- Original Message -----
> From: "Sebastien Villaume" <[email protected]>
> To: "CF Metadata" <[email protected]>
> Sent: Wednesday, 4 April, 2018 14:04:42
> Subject: [CF-metadata] how to use ocean_mixed_layer_thickness_defined_by_*
> Dear list,
>
> I have a question regarding the use of the standard names of the form
> ocean_mixed_layer_thickness_defined_by_*
>
> the definition from the official standard name table is:
>
> "The ocean mixed layer is the upper part of the ocean, regarded as being
> well-mixed. The base of the mixed layer defined by temperature, sigma or
> sigma_theta is the level at which the quantity indicated differs from its
> surface value by a certain amount."
>
> From what I understand, in the case of
> ocean_mixed_layer_thickness_defined_by_temperature, I should specify some
> quantity as a scalar (Z axis), but it is actually a temperature difference
> that
> I need to encode, not a plain temperature : temp_surf - temp_base_level =
> temp_delta_defining_mixed_layer_thickness
>
> if it was simply a temperature I would maybe use:
>
> float swpt ;
> swpt:standard_name = "sea_water_potential_temperature" ;
> swpt:units = "degC" ;
> swpt:axis = "Z" ;
> swpt:positive = "down" ;
>
> but what I really want to encode is a temperature difference. How can I
> specify
> that? Is "sea_water_potential_temperature" the correct standard name to use?
>
>
> same question for ocean_mixed_layer_thickness_defined_by_sigma_theta, how do I
> encode a "difference" in sigma_theta?
>
> thanks,
>
> ____________________________________
>
> Dr. Sébastien Villaume
>
> M.A.R.S. Analyst
> ECMWF Data Governance facilitator
>
> ECMWF
> Shinfield Park,
> Reading RG2 9AX, UK
> +44 (0)118 949 9301
> +44 (0)7825 521592
> [email protected]
> ____________________________________
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