I sincerely hope you're wrong about these standard names, Jonathan!
We include precip in our met files, and use the
lwe_thickness_of_precipitation_amount
standard name to report the actual level of water in a rain gauge.
It is NOT a rate of precip, which is calculated (roughly, for rain
gauges) by a first difference.
If the values in this variable were interpreted as a rate, it would be
completely incorrect; values
that are unchanging convert to a rate of 0, no matter how high they may be.
Maybe I've been mis-using this standard name?
Thanks - Nan
On 1/24/19 9:34 AM, Jonathan Gregory wrote:
Dear Lars
1. If I have (observed) daily precipitation with unit mm/day and want to store
this in a CF compliant file, should I use standard name
--- "lwe_thickness_of_precipitation_amount" with canonical unit metre and the "per
day" part is inferred from the time bounds, or
--- "lwe_precipitation_rate" having canonical unit "m s-1",
--- if both are acceptable, is one to be preferred?
You can use whichever you prefer. They would also be distinguished by
cell_methods. The first is extensive in time, so it has cell_methods of sum,
the second is intensive and has cell_methods of mean.
2. The long_name is free, but should be descriptive. I am thinking of this as a
succinct plot title, so the question is what practical limitation there might
be in relation to different software. Is it advisable to use ASCII spaces (from
Github issue #141 indicates that only standard ASCII character set should be
used) ?
I expect others have something useful to say about that.
Best wishes
Jonathan
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