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Re: [ferret_users] question about @DDC with different calendar
- To: ferret_users@xxxxxxxx
- Subject: Re: [ferret_users] question about @DDC with different calendar
- From: "Ansley C. Manke" <ansley.b.manke@xxxxxxxx>
- Date: Thu, 16 Jan 2020 12:46:22 -0800
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Hi,
It uses the calendar that is defined for that grid, so
internally, for all computations involving time, the time
coordinates are converted to seconds since the time origin defined
for that calendar. Depending on the timesteps this will affect
results of computations like averages and integrals and
derivatives. If the timestep is days, then of course the number
of seconds in a day doesn't vary - but if the timesteps are
longer, for instance months or years you would see a difference.
-Ansley
On 1/16/2020 11:23 AM, Xiaoyu Bai
wrote:
Dear ferreters,
I am applying L=@DDC to some model outputs in a loop
(repeat). According to the general info of @DDC (
https://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/variables-xpressions/XPRESSIONS#GeneralInfo), "Ferret
attempts to use standardized units
for the grid coordinates, ..., If
the underlying axis is in a known unit of time Ferret
converts grid box lengths to seconds". My question here is
does "ferret convert grid to standardized time unit" mean
ferret convert time to Gregorian calendar seconds. Or ferret
convert seconds according to the calendar itself. I also
have 360_DAY and NOLEAP calendar from my model output.
Cheers,
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