> -----Original Message-----
> From: Tomoo Ogura [mailto:[email protected]]
> Sent: Tuesday, March 01, 2011 11:49 PM
> To: Cameron-smith, Philip; Jonathan Gregory
> Cc: Jennifer Kay; Yoko Tsushima; [email protected]; Tomoo Ogura
> Subject: Re: [CF-metadata] Proposal for new standard names
>
> Dear Jonathan,
>
> > Yes, this makes sense to me (not being an expert - thanks for
> explaining).
> > That seems a good reason for using your word sedimentation and
> adding
> > _of_cloud_liquid_water as you suggested - so back to what we had
> agreed,
> > with the useful distinction between sedimentation and precipitation
> of
> > the basis of speed, thanks to Philip.
>
> Thanks for this.
>
> Dear Philip,
>
> Let me explain a little more about the proposal.
> I think the criteria for distinguishing the two regimes, fast-falling
> and
> slow-falling processes, could be whether it is related to "rain" or
> "cloud liquid water".
>
> Since "rain" and "cloud liquid water" have well-established
> definitions,
> these criteria may work for all groups interested in CF, including
> observations, GCMs, and regional modeling communities.
>
> If we follow the criteria, all the standard names related to
> the tendencies of cloud liquid water will use "sedimentation",
> so there should be no confusion with "precipitation".
>
> Best wishes,
>
> Tomoo
>
Hi Tomoo,
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.
For the record, what are the well-established definitions of "rain" and "cloud
liquid water"? Is this already part of CF?
Best wishes,
Philip
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