[ncl-talk] Changing 360 day calendar to 365 day standard calendar
Dennis Shea
shea at ucar.edu
Tue Sep 24 19:37:22 MDT 2019
The issue is *NOT* with the 'calendar_convert_360_to_365_date' function.
Rather, the source file's 'time' variable is NOT properly formed. For a
360_day
calendar all months have 30-days [ 12*30=360 :-) ]. This includes February.
The following look correct/similar:
A: Correct 360_day
zg700_day_HadGEM2-ES_rcp85_r1i1p1_19810101-20141231_360day.nc <====
Correct 360_day
double time(time) ;
[snip]
time:units = "days since 1859-12-01" ;
time:calendar = "360_day" ;
B: Incorrect 360_day ... generically looks the same but the time is wrong
zg700_day_HadGEM2-ES_historical_rcp85_r1i1p1_SMHI-RCA4_19800101-20131231_norm.nc
<=== Incorrect 360_day
double time(time) ;
[snip]
time:units = "days since 1949-12-1 00:00:00" ;
time:calendar = "360_day" ;
====================
diri = "./"
fila = "zg700_day_HadGEM2-ES_rcp85_r1i1p1_19810101-20141231_360day.nc"
ptha = diri+fila
fa = addfile(ptha,"r")
filb =
"zg700_day_HadGEM2-ES_historical_rcp85_r1i1p1_SMHI-RCA4_19800101-20131231_norm.nc"
pthb = diri+filb
fb = addfile(pthb,"r")
time360a = fa->time
YMDH360a = cd_calendar(time360a,-3)
time360b = fb->time
YMDH360b = cd_calendar(time360b,-3)
print("A: "+time360a+" "+YMDH360a+" ; B: "+time360b+" "+YMDH360b)
======================
The 'time360a' and 'time360b' are numerically different due to different
reference dates. However, successive time steps should be separated by
one-day [ 1.0 ]
for the original 'time' variable.
The "B" file is separated by 2.0 in leap years and 3.0 in non-leap years.
[SNIP]
(56) A: 43646.5 1981022712 ; B: 10886.5 1980022712
(57) A: 43647.5 1981022812 ; B: 10887.5 1980022812
(58) A: 43648.5 1981022912 ; B: 10888.5 1980022912 should be
followed by
1981023012
(59) A: 43649.5 1981023012 ; B: 10890.5 1980030112 1980030112
repeated twice
(60) A: 43650.5 1981030112 ; B: 10890.5 1980030112
(61) A: 43651.5 1981030212 ; B: 10891.5 1980030212
(62) A: 43652.5 1981030312 ; B: 10892.5 1980030312
[SNIP]
(413) A: 44003.5 1982022412 ; B: 11243.5 1981022412
(414) A: 44004.5 1982022512 ; B: 11244.5 1981022512
(415) A: 44005.5 1982022612 ; B: 11245.5 1981022612
(416) A: 44006.5 1982022712 ; B: 11246.5 1981022712
(417) A: 44007.5 1982022812 ; B: 11247.5 1981022812 should be
followed
1981022912
1981023012
The following
two-day sequence
(418) A: 44008.5 1982022912 ; B: 11250.5 1981030112 <=== twice
repeated
(419) A: 44009.5 1982023012 ; B: 11251.5 1981030212 <===
(420) A: 44010.5 1982030112 ; B: 11250.5 1981030112 <===
(421) A: 44011.5 1982030212 ; B: 11251.5 1981030212 <===
[SNIP]
=====
*%> ncl* hadgem.calendar_compare.ncl
Good luck
On Mon, Sep 23, 2019 at 9:40 PM Kwesi A. Quagraine via ncl-talk <
ncl-talk at ucar.edu> wrote:
> Dear NCLers,
>
> Apologies for revisiting this again.
>
> I am using the calendar_convert_360_to_365_date.ncl script provided
> earlier by Denis, to convert a 360 day calendar to 365 day standard
> calendar. However I get this error below;
>
> fatal:Subscript out of range, error in subscript #0
> fatal:An error occurred reading it360
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 161 in
> file ./calendar_convert_360_to_365_date.ncl
>
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 27 in
> file hadgem_360_365.ncl
>
> fatal:Variable (zg365) is undefined
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 29 in
> file hadgem_360_365.ncl
>
> fatal:Variable (zg365) is undefined
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 30 in
> file hadgem_360_365.ncl
>
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 31 in
> file hadgem_360_365.ncl
>
> (0) ==================
> fatal:Variable (zg365) is undefined
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 65 in
> file hadgem_360_365.ncl
>
> I am not sure what is happening there since the loop that is being
> iterated through uses the correct loop structure in NCL;
>
> ======
> do nt=0,nitime-1
> x365(it360(nt),:,:,:) = x360(it365(nt),:,:,:)
> end do
> end if
> ======
>
> I will be grateful for any help on this. I have attached my file and the
> calendar convert file I am using.
>
> Warm regards
> Kwesi
>
> (ncl_notebook) kwesi at maggie:~/terra/cordex$ ncl -V
> 6.6.2
>
> (ncl_notebook) kwesi at maggie:~/terra/cordex$ conda --version
> conda 4.3.30
>
> (ncl_notebook) kwesi at maggie:~/terra/cordex$ env | grep NCARG
> OLD_NCARG_ROOT=/share/apps/ncl-6.2.1
> NCARG_ROOT=/home/kwesi/miniconda3/envs/ncl_notebook
>
> ncdump file gives;
>
> netcdf
> zg700_day_HadGEM2-ES_historical_rcp85_r1i1p1_SMHI-RCA4_19800101-20131231_norm
> {
> dimensions:
> lon = 91 ;
> lat = 103 ;
> plev = 1 ;
> time = UNLIMITED ; // (12240 currently)
> bnds = 2 ;
> variables:
> double lon(lon) ;
> lon:standard_name = "longitude" ;
> lon:long_name = "longitude" ;
> lon:units = "degrees_east" ;
> lon:axis = "X" ;
> double lat(lat) ;
> lat:standard_name = "latitude" ;
> lat:long_name = "latitude" ;
> lat:units = "degrees_north" ;
> lat:axis = "Y" ;
> double plev(plev) ;
> plev:standard_name = "air_pressure" ;
> plev:long_name = "pressure" ;
> plev:units = "Pa" ;
> plev:positive = "down" ;
> plev:axis = "Z" ;
> double time(time) ;
> time:standard_name = "time" ;
> time:long_name = "time" ;
> time:bounds = "time_bnds" ;
> time:units = "days since 1949-12-1 00:00:00
> <http://airmail.calendar/1949-12-01%2000:00:00%20GMT+2>" ;
> time:calendar = "360_day" ;
> time:axis = "T" ;
> double time_bnds(time, bnds) ;
> float zg(time, plev, lat, lon) ;
> zg:standard_name = "geopotential_height" ;
> zg:long_name = "Geopotential Height" ;
> zg:units = "m" ;
> zg:_FillValue = 1.e+20f ;
> zg:missing_value = 1.e+20f ;
> zg:cell_methods = "time: mean" ;
>
> -----------
> Try not to become a man of success but rather a man of value- Albert
> Einstein
>
> Kwesi A. Quagraine
> Climate System Analysis Group (CSAG)
> Environmental and Geographical ScIence (EGS)
> University of Cape Town
> Private Bag, Rondebosch, 7701
> South Africa
>
> Alt. Email: starskykwesi at gmail.com
> Web: http://www.csag.uct.ac.za
> Office: +27 21 650 3164
> Skype: quagraine_cwasi
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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