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Clarification wrt mixing ratios #16

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Aug 3, 2021
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Clarification wrt mixing ratios #16

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8f74fe4
Clarification wrt mixing ratios.
ligiabernardet Jul 30, 2021
afed7be
Clarifications regarding mixing ratio and number concentration.
ligiabernardet Aug 2, 2021
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23 changes: 21 additions & 2 deletions StandardNamesRules.rst
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Expand Up @@ -56,6 +56,24 @@ 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. The long name should
explicitly specify that it refers to the *mass* mixing ratio.
Mass mixing ratios should contain information regarding
with respect to what quantity they are defined, and options are *wrt_dry_air*, *wrt_moist_air*,
or *wrt_total_mass*, where *moist_air* refers to dry air plus vapor and *total_mass* refers
to dry air plus vapor and hydrometeors. A special case exists in the case of mixing ratio
of vapor: the standard name *specific_humidity* should be used instead of
*mixing_ratio_of_vapor_wrt_moist_air*.

#. Volume mixing ratios should be qualified as *volume_mixing_ratio*.

#. 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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Looks fine now.

#. Number concentration should appear as a prefix, that is, *number_concentration_of*. By default,
number concentrations are specified per unit of volume. When they are specified per
unit of mass, they should be written as *mass_number_concentration_of*.

#. If possible, qualifiers should be limited in order to allow for a wide
applicability of the variable. In other words, don't qualify with _for ``_xyz``
unless a variable could not conceivably be used outside of the more
Expand Down Expand Up @@ -253,7 +271,6 @@ Prefixes
| **index_of**
| **vertical_index_at**
| **vertical_dimension_of**
| **volumetric**
| **cumulative**
| **iounit_of**
| **filename_of**
Expand Down Expand Up @@ -438,7 +455,7 @@ standard names.
+-------------------------------------------+-----------------+
| mass_fraction | 1 |
+-------------------------------------------+-----------------+
| mass_mixing_ratio | 1 |
| mixing_ratio | kg kg-1 |
+-------------------------------------------+-----------------+
| mass_transport k | g s-1 |
+-------------------------------------------+-----------------+
Expand Down Expand Up @@ -478,6 +495,8 @@ standard names.
+-------------------------------------------+-----------------+
| volume_fraction | 1 |
+-------------------------------------------+-----------------+
| volume_mixing_ratio | mol mol-1 |
+-------------------------------------------+-----------------+
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| volume_transport | m3 s-1 |
+-------------------------------------------+-----------------+
| vorticity | s-1 |
Expand Down