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Add new 'precipitation' standard name rule. #35

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May 16, 2023
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Add new 'precipitation' standard name rule. #35

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Add new 'precipitation' standard name rule.
nusbaume Apr 26, 2023
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Provide example of a standard name that represents a single type of f…
nusbaume May 1, 2023
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26 changes: 16 additions & 10 deletions StandardNamesRules.rst
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Expand Up @@ -58,27 +58,33 @@ CCPP Standard Name Rules
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*,
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*.
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*.

#. By default, *mole_fraction_of_X_in_Y* refers to the total amount of *Y*. So, for example,
*mole_fraction_of_ozone_in_air* refers to the total amount of (moist) air. (In the case of air,
the default meaning is moist air, as described in the *mixing ratio* rule.) When this is not
the case, a qualifier should be used to denote this. *e.g.*, *mole_fraction_of_ozone_in_dry_air*.
the case, a qualifier should be used to denote this. *e.g.*, *mole_fraction_of_ozone_in_dry_air*.

#. When referring to soil quantities,
#. When referring to soil quantities,
*volume_fraction* should be used to express the volumetric soil moisture.

#. Number concentration should appear as a prefix, that is, *number_concentration_of*. By default,
#. 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*.
unit of mass, they should be written as *mass_number_concentration_of*.

#. By default, *precipitation* refers to the sum of all phases of precipitating hydrometeors,
for example rain plus graupel plus hail. The term *frozen_precipitation* refers to the
sum of all frozen precipitating hydrometers, for example graupel plus hail (but not rain).
Otherwise the standard name should explicitly state the type of hydrometeor(s) the
named quantity represents (e.g. *graupel*).

#. 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``
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