[ncl-talk] Removing annual cycle and nth harmonics from one dimensional data

[Dennis Shea]

Not tested

Explicit approach

   prc1d(time)
   ntim = dimsizes(prc1d)
   nlat = 1
   mlon = 1

; expand 1D to 3D

   prc3d  = *conform_dims*((/ntim,nlat,mlon/), prc1d, 0)
   printVarSummary(prc3d)

   yyyyddd =

   prc3d_ClmDay = *clmDayTLL*
<http://www.ncl.ucar.edu/Document/Functions/Contributed/clmDayTLL.shtml>(prc3d,
yyyyddd)
   printVarSummary(prc_3d)


   prc3d_ClmDay = *clmDayTLL*
<http://www.ncl.ucar.edu/Document/Functions/Contributed/clmDayTLL.shtml>(prc3d,
yyyyddd)
   prc3d_Anom   = *calcDayAnomTLL* (prc3d, yyyyddd, prc3d_ClmDay)
    :
    :
======================
2nd approach, cleaner and easier

there are *undocumented functions*  *clmDayT*, *calcDayAnomT*

prc1d_ClmDay    = *clmDayT*(prc1d, yyyyddd)
printVarSummary(prc1d_ClmDay )
prc1d_AnomDay =* calcDayAnomT*(prc1d, yyyyddd, prc1d_ClmDay)
printVarSummary(prc1d_AnomDay)

Look at *contributed.ncl*
 search for the above functions if you want






On Fri, Aug 6, 2021 at 12:20 PM Lyndz via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL-Experts,
>
> I have daily rainfall data from 1979-2017.
>
> I would like to:
>
> [a] Remove the annual cycle
> [b] Then remove the seasonal cycle (3rd harmonics).
>
> I saw this function in NCL which computes the daily climatology first
> before getting the anomalies (including smoothed anomalies).
>
> *http://www.ncl.ucar.edu/Document/Functions/Contributed/calcDayAnomTLL.shtml
> <http://www.ncl.ucar.edu/Document/Functions/Contributed/calcDayAnomTLL.shtml>*
>
> But this can only be applied for *time x lat x lon data*.
>
> Is there an equivalent function of one-dimationsal (time series) data like
> this?
> If none, do you have any suggestions on how I can do this in NCL?
>
>
> I'll appreciate any help.
>
> -Lyndz
>
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