Clarification wrt mixing ratios #16
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Adding @mattldawson as he pointed out the inconsistency initially. |
StandardNamesRules.rst
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| @@ -56,6 +56,15 @@ CCPP Standard Name Rules | |||
| representing quantities at the interface between grid cells vertically, | |||
| use at_interface. | |||
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| #. By default, *mixing_ratio* refers to mass mixing ratios. Volume mixing ratios should be | |||
| qualified as *volume_mixing_ratio*. Mass mixing ratios should contain information regarding | |||
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Volume mixing ratio sentence may not be needed as examples of this would be unlikely in microphysics schemes.
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Volume mixing ratio appear for chemical compositions, and are important in radiation parameterizations. We already have several standard names that start with volume_mixing_ratio (of co2, n2o, ch4, etc.). So, I think this sentence is needed.
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I would still like the term, "mass mixing ratio", to appear in the field's long_name property. Could this be added?
Also, as long as we are at it, should we add a rule for number concentration? The usage in #13 sometimes has the term last (e.g., prescribed_cloud_droplet_number_concentration) and sometimes it is first (e.g., mass_number_concentration_of_aerosol_from_gocart_climatology). CF seems to always have it first (although it does not have any terms called mass_number_concentration).
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While these rules are for standard names, we can add a recommendation for using the word "mass" in the long name.
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I am okay with this change, @dudhia, please "Resolve" this conversation if you agree.
| of vapor: the standard name *specific_humidity* should be used instead of | ||
| *mixing_ratio_of_vapor_wrt_moist_air*. When referring to soil quantities, | ||
| *volume_fraction* should be used to express the volumetric soil moisture. | ||
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Soil moisture should be a separate point from the microphysics paragraph above.
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OK, we can put the soil aspect in a different bullet
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Maybe some separation of microphysics, radiation, and soil paragraphs could
be done.
…On Fri, Jul 30, 2021 at 2:11 PM ligiabernardet ***@***.***> wrote:
***@***.**** commented on this pull request.
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In StandardNamesRules.rst
<#16 (comment)>
:
> @@ -56,6 +56,15 @@ CCPP Standard Name Rules
representing quantities at the interface between grid cells vertically,
use at_interface.
+#. By default, *mixing_ratio* refers to mass mixing ratios. Volume mixing ratios should be
+ qualified as *volume_mixing_ratio*. Mass mixing ratios should contain information regarding
Volume mixing ratio appear for chemical compositions, and are important in
radiation parameterizations. We already have several standard names that
start with *volume_mixing_ratio* (of co2, n2o, ch4, etc.). So, I think
this sentence is needed.
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StandardNamesRules.rst
Outdated
| @@ -56,6 +56,15 @@ CCPP Standard Name Rules | |||
| representing quantities at the interface between grid cells vertically, | |||
| use at_interface. | |||
|
|
|||
| #. By default, *mixing_ratio* refers to mass mixing ratios. Volume mixing ratios should be | |||
| qualified as *volume_mixing_ratio*. Mass mixing ratios should contain information regarding | |||
There was a problem hiding this comment.
I would still like the term, "mass mixing ratio", to appear in the field's long_name property. Could this be added?
Also, as long as we are at it, should we add a rule for number concentration? The usage in #13 sometimes has the term last (e.g., prescribed_cloud_droplet_number_concentration) and sometimes it is first (e.g., mass_number_concentration_of_aerosol_from_gocart_climatology). CF seems to always have it first (although it does not have any terms called mass_number_concentration).
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Regarding @gold2718 's comment about number concentration, we can indeed clarify this in the rules. We likely want number_concentration_of_X, to match CF conventions. For number concentration, per unit of volume (m-3) is the default and if the quantity is per unit of mass (kg -1), a qualifier must be used: mass_number_concentration. |
In these PR I clarified the use of (mass and volume) mixing ratios, as well as the representation of soil moisture. These clarifications are meant to address comments submitted during the review of #13.