[ncl-talk] How to define date for WRF-chem to get average daily of a variable ?

[Dennis Shea]

As noted in the documentation, *calculate_daily_values*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_daily_values.shtml>
requires that the variable have a **time coordinate** that is recognized by
cd_calendar.

  Times = f->Times                    ; Times(Time, DateStrLen)
(type character)
  Time = *wrf_times_c*( Times, 0 )      ; "hours since" initial time
on file   (double); units recognized by cd_calendar

     a2           = f->TAUAER   ; (Time, south_north, west_east)
     a2&Time = Time   ; associate the 'Time' coordinate with the variable
using  standard NCL & syntax
     printVarSummary(a2)
     print("------------------------------------")

   a2Day = calculate_daily_values (a2, "avg", 0, opt)
   printVarSummary(a2Day)
   printMinMax (a2Day,1)



On Wed, Oct 5, 2022 at 9:30 AM Setareh Rahimi via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL users,
>
> I am trying to plot the daily average of AOD (aerosol optical depth) from
> WRF-chem outputs. However, I can not define the time so that NCL plots the
> daily average of AOD.(the script has been attached, and the model output is
> too large and I just used ncdump to show the header of some varibles ).
> I tried the following commands:
>
>
> times = wrf_user_getvar(f,"times",-1)
> printVarSummary(times)
> print(times)
> ymdh = cd_calendar(a2&times, -2)
>   print(ymdh)
>
> but faced an error.
> Would you please kindly advise me on how can I calculate the daily average
> of AOD from the hourly output of WRF-chem?
> Many thanks in advance,
> Best wishes,
> --
> S.Rahimi
>
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