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ESCOMP / CCPPStandardNames

Repository for community-accepted CCPP Standard Names and search tools
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Clarification wrt mixing ratios #16

Closed ligiabernardet closed 3 years ago

ligiabernardet commented 3 years ago

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 https://github.com/ESCOMP/CCPPStandardNames/pull/13.

ligiabernardet commented 3 years ago

@gold2718 @climbfuji @dudhia

cacraigucar commented 3 years ago

Adding @mattldawson as he pointed out the inconsistency initially.

dudhia commented 3 years ago

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.

In StandardNamesRules.rst https://github.com/ESCOMP/CCPPStandardNames/pull/16#discussion_r680193839 :

@@ -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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ligiabernardet commented 3 years ago

Regarding @gold2718 's comment about number concentration, we can indeed clarify this in the rules. We likely want _number_concentration_ofX, 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_numberconcentration.

ligiabernardet commented 3 years ago

All comments have been addressed in the last update. @dudhia @gold2718 Please take a look.