[ncl-talk] Daily averaged ozone concentration
Bucaram Carbo, Carlos
carlos.bucaramcarbo at und.edu
Mon Aug 7 17:03:23 MDT 2017
Hi Dennis,
Thank you for your reply, and comments. We proceeded as you recommended, and then tried to visualize the output on a second NCL script. The end result could be seen on the attached .pdf file. A few thoughts on what we have found out so far:
1. We can process a single wrfout_d01* file at a time, with the Wrf_hrly_to_daily.ncl script. However when we have tried to process a wrfout_d01* file with multiple hours of data, we observe errors on the terminal screen and virtually no data on the resulting o3.day.nc netcdf file. Also the script will not read multiple wrfout_d01* single hour data files, and just pick and process the very last hour of such batch of data files.
2. The visual output is very appealing, but it would be desirable to have a visual representation within the domain area of study
Attached you will find the NCL scripts we have used, the resulting o3.day.nc netcdf file, as well as the .pdf post-processed image. Also we would be glad to share the wrfout_d01* files we have used so far, through Dropbox, if you think it might help.
As before we do appreciate your help and feedback with this issue.
Best regards,
Carlos
________________________________
From: Dennis Shea <shea at ucar.edu>
Sent: Friday, August 4, 2017 9:23:24 PM
To: Bucaram Carbo, Carlos
Cc: ncl-talk at ucar.edu
Subject: Re: [ncl-talk] Daily averaged ozone concentration
After
filAtt = 0
filAtt at title = "O3: Daily Mean"
filAtt at Conventions = "None"
filAtt at creation_date = systemfunc("date")
filAtt at NCL = get_ncl_version()
Add the following line:
copy_VarAtts(f[0], filAtt) ; copy WRF file attributes
Cheers
D
On Fri, Aug 4, 2017 at 7:25 PM, Bucaram Carbo, Carlos <carlos.bucaramcarbo at und.edu<mailto:carlos.bucaramcarbo at und.edu>> wrote:
Hi Dennis,
Thank you for your quick reply. Upon your suggestion we downloaded the pre-compiled binaries of NCl 6.4.0 for our Linux distribution configuration , openSUSE Leap 42.1_x86_64, and thankfully got it to work.
We also used your script and and it work very well to give us an average of the ground level o3 values on a new netcdf file, as well as on the terminal screen. However for some reason the new NCL image appear to revert to polar coordinates, and not to the original Lambert Conformal ones of the original wrfout_d01* file.
Below you will see the message which we received on our terminal screen:
Bucaram at linux-vx3k:~/Documents2/ncl_ncarg-6.4.0.Linux_CentOS7.3_x86_64_nodap_gnu485/bin> ./ncl ozone_script.ncl
Copyright (C) 1995-2017 - All Rights Reserved
University Corporation for Atmospheric Research
NCAR Command Language Version 6.4.0
The use of this software is governed by a License Agreement.
See http://www.ncl.ucar.edu/ for more details.
(0) wrf_map: Error: no MAP_PROJ attribute in input file
It appears that since a map projection is not found on the newly produced o3.day.nc<http://o3.day.nc> file, the NCL post-processed image shows (North) polar coordinates.
Also attached you will find the script as well as the pdf post-processed file from NCL 6.4.0. Please let me know if you think it might be possible to include the original map projection on the post-processed image, so as to visualize the average ground level o3 concentration in the original domain.
Thanks again for your help and best regards,
Carlos
________________________________
From: Dennis Shea <shea at ucar.edu<mailto:shea at ucar.edu>>
Sent: Thursday, August 3, 2017 8:38:11 PM
To: Bucaram Carbo, Carlos
Cc: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Daily averaged ozone concentration
What version of NCL do you have?
The attached script uses a 6.4.0 function: calculate_daily_values
It is untested ... don't have multiple hourly files.
https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_daily_values.shtml
calculate_daily_values - CISL's NCAR Command Language (NCL)<https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_daily_values.shtml>
www.ncl.ucar.edu<http://www.ncl.ucar.edu>
NCL Home > Documentation > Functions > General applied math calculate_daily_values. Calculate daily values [avg, sum, min, max] from high frequency temporal values.
On Thu, Aug 3, 2017 at 1:44 PM, Bucaram Carbo, Carlos <carlos.bucaramcarbo at und.edu<mailto:carlos.bucaramcarbo at und.edu>> wrote:
Dear NCL Support,
We are trying to find a script that would read 24 individual 1-hour wrfout_d01* output files for every day of an entire month of the year, then average the individual hourly ground level ozone (o3) concentrations data over each daily 24-hour period (at lowest level nl=0), and write a new netcdf file with an gridded o3 average concentration for that specific day. The end result would be a visual representation of a gridded o3 average concentration for any specific day, if possible.
When searching on previous archives we found the following response to a somewhat similar inquire back in 2011, but we are not sure if it would apply in our case:
https://www.ncl.ucar.edu/Support/talk_archives/2011/1358.html
NCL:
x3 = f->X ; (time,lat,lon) time is 3-hrly
dimx3 = dimsizes(x3)
ntim3 = dimx3(0)
nsd = 8 ; number of samples per day
xday = x3(::nsd,:,:) ; create array with meta data
do nt=0,ntim3-1,nsd
xday(nt/nsd,:,:) = (/ dum_avg_n(nt:nt+nsd-1,:,:) /)
end do
diro = "./" ; output directory
filo = "day.nc<http://day.nc>"
system ("/bin/rm -f "+diro+filo)
fnc = addfile (diro+filo, "c")
filAtt = 0
filAtt at title = "..."
filAtt at Conventions = "None"
filAtt at creation_date = systemfunc("date")
fileattdef( fnc, filAtt ) ; create file attributes
filedimdef(ncdf,"time",-1,True) ; make time UNLIMITED
fnc->XDAY = xday
Also attached you will find the current wrf_ozone.ncl script which we use to post-process each individual 1-hour wrfout_d01* file for o3, as a well as a sample post-processed image for a specific day and hour of 2010.
Any specific direction from your side regarding this issue would be greatly appreciated.
With best regards,
Carlos J. Bucaram
Graduate Research Assistant
University of North Dakota
Department of Chemical Engineering
Harrington Hall Room 223
241 Centennial Dr., Grand Forks, ND
58202-7101
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