Hi Philip,
This seems a reasonable distinction. I assume that your
proposal is that the existing std_names with 'precipitation'
should now be defined to exclude sedimentation of clouds
and aerosols. I suspect that this is probably how
people have already used them, so I would not object.
But there may be someone else who has a different opinion.
Either way, we should request that the description of
those 'precipitation' names be amended to reflect
the change.
I agree with you - thanks for this.
Regarding the definition of rain and cloud liquid water,
I should have been more careful about whether it is established
or not, since I'm not certain about it - I'm sorry for this.
I just wanted to mention the description in the Glossary
of Meteorology of American Meteorological Society.
It may not be part of CF yet.
raindrop
A drop of water of diameter greater than 0.2 (or 0.5)mm
falling through the atmosphere.
cloud drop
A spherical particle of liquid water, from a few
micrometers to a few tens of micrometers diameter.
A diameter of 0.2mm has been suggested as an upper
limit to the size of drops.
Best wishes,
Tomoo
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