# [ncl-talk] month_to_season

Dennis Shea shea at ucar.edu
Thu May 26 08:36:25 MDT 2022

It is always best to examine the variable's structure via
printVarSummary(...)

[1]
o3x = f[:]->O3
printVarSummary(o3x)        ; I speculate 4 dimensions
(time,level,lat,lon)

[2]
o3x_surf = o3x(0,55,:,:)
printVarSummary(o3x_surf)   ; TWO dimension (lat,lon);  NO 'time'
dimension

I think you want
o3x_surf = o3x(:,55,:,:) ; (time,lat,lon)

[3]
; seasons average at surface
xDJF = month_to_seasonN(o3x,(/"DJF","MAM","JJA","SON"/))
printVarSummary(xDJF)       ; I speculate  (4,lat,lon)

The name xDJF implies a one season mean for DJF but it is not.
I think it should contain 4 seasonal means

I think you should name it xSea for 'season'
xSea_surf = month_to_seasonN(o3x_surf,(/"DJF","MAM","JJA","SON"/))
printVarSummary(xSea_surf)       ; I speculate  (4,lat,lon)

[4]
The following creates a scalar variable of type string
o3x_surf1 = "DJF"
print(03x_surf1)

I have no idea why you are doing this.
***This has no spatial information.*** It cannot be plotted on a map.

[5]
The rest is too confusing to explain.

To get to the 'answer'
xSea_surf(4,lat,lon)

has spatial coordinates:
lat: [ -90..  90]
lon: [   0..358.75]

You must use *lonFlip*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/lonFlip.shtml> to
get longitudes to get the -180->180 range
xSea_surf :=* lonFlip*
<https://www.ncl.ucar.edu/Document/Functions/Contributed/lonFlip.shtml>
(xSea_surf)
printVarSummary(xSea_surf)        ; look at 'new' coordinates

--
res at gsnLeftString = "DJF_dry cold"
plot1 = gsn_csm_contour_map_ce(wks,xSea_surf(0,{-35:35},{-30:60}),res)

res at gsnLeftString = "MAM_dry warm"
plot2 = gsn_csm_contour_map_ce(wks,xSea_surf2(1,:,:),res)

etc
=======

I did this VERY QUICKLY. there may be errors but you shuld have the idea of
how to proceed.

Good Luck

On Thu, May 26, 2022 at 6:59 AM Najib Yusuf via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear NCL experts and colleagues,
>
> I have an error with the subscripting in the attached script while trying
> to plot spatial distribution month_to_season surface Ozone model data.  I
> did try to change my subscripting to solve the error but seems beyond my
> little understanding of subscripting in ncl. Kindly assist.
>
> Variable: o3x_surf
> Type: float
> Total Size: 221184 bytes
>             55296 values
> Number of Dimensions: 2
> Dimensions and sizes:   [lat | 192] x [lon | 288]
> Coordinates:
>             lat: [ -90..  90]
>             lon: [   0..358.75]
> Number Of Attributes: 6
>   lev : 992.5000106104562
>   time :        2953
>   cell_methods :        time: mean
>   long_name :   O3 concentration
>   units :       mol/mol
>   mdims :       1
> (0)     O3 concentration (mol/mol) : min=3.61245   max=77.7517
>
> Variable: xMon
> Type: integer
> Total Size: 48 bytes
>             12 values
> Number of Dimensions: 1
> Dimensions and sizes:   [time | 12]
> Coordinates:
>             time: [2953..3287]
> Number Of Attributes: 1
>   long_name :   current date (YYYYMMDD)
>
>
> Variable: xMon
> Type: integer
> Total Size: 48 bytes
>             12 values
> Number of Dimensions: 1
> Dimensions and sizes:   [time | 12]
> Coordinates:
>             time: [2953..3287]
> Number Of Attributes: 1
>   long_name :   current date (YYYYMMDD)
> (0)     20130201
> (1)     20130301
> (2)     20130401
> (3)     20130501
> (4)     20130601
> (5)     20130701
> (6)     20130801
> (7)     20130901
> (8)     20131001
> (9)     20131101
> (10)    20131201
> (11)    20140101
> fatal:Number of subscripts do not match number of dimensions of
> variable,(2) Subscripts used, (1) Subscripts expected
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 137 in
> file month_to_seasO3.ncl
>
>
>
> *------------------------------------*
>
> *Najib Yusuf Galadanci Ph.D.*
>
> *Assistant Director (R & D)*
>
> *Lower Atmospheric Dynamics(Aerosol radiative forcing, air quality
> observations and modeling)Centre for Atmospheric ResearchNational Space
> Research and Development Agency. Kogi StateUniversity Campus, Anyigba. Kogi
> State. Nigeria+234 80 3871 4158------------------------------------Know
> that Victory comes with Patience, Relief with Affliction, and Ease with
> Hardship.Prophet Muhammad Rasulullah *
>
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