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Re: [ferret_users] Monthly climatologies repeated along long time axis

Perfect, thanks Billy


On Sun, Jul 9, 2017 at 6:22 PM, William S. Kessler <william.s.kessler@xxxxxxxx> wrote:
If A is your 20-year time series and ACL is your 12-month climatology:

First, put the climatology on a modulo time axis:

let ACLMOD = ACL[gt=month_reg@mod]

Extend it to the time axis of A:

let ACLRG = ACLMOD[gt=A]

let ADM = A - ACLRG  ! anomalies

Sent from my phone .... Please excuse my brevity .... and my typing.

> On Jul 9, 2017, at 4:06 PM, Paul Goddard <pgoddard@xxxxxxxxxxxxxxxxx> wrote:
> Hi all,
> It is likely that an answer is already on the ferret users archive, if so, just refer me to that page, but I could not find what I was looking for.
> I have a monthly climatology, so 12 time steps.  I would like to subtract the climatology off a 20 year monthly data set (of 240 time steps) to end with an anomaly with 240 time steps. How can I regrid the 12 climatologies to a 240 time step axis with the 12 months of the climatology just repeated 20 times.
> Thanks in advance,
> Paul

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