[CF-metadata] Jonathan Gregory: chlorophyll units

[Steve Emmerson]

Dear CF-er,

> Jonathan Gregory <j.m.gregory at reading.ac.uk>, wrote
> I think the problem is that udunits thinks g is a unit of acceleration!
> However, it will accept gram and milligram, so you could try that instead.

That's correct.  Having the symbol "g" be an alias for standard free
fall was a mistake and is corrected in the UDUNITS-2 package (which now
has a UDUNITS-1 C API for backward compatibility).

If you prefer to continue using the UDUNITS package, then the following
edits to the units database file, etc/udunits.dat, will correct the
situation:

Delete the entry

g                       S gravity               # approx. should be `local'

Add the entry

g                       S gram

after the entry for "gram".

Regards,
Steve Emmerson
UDUNITS developer