7 thoughts on “Assessment of Climate Change Impacts on Streamflow and Hydropower in Antalya, Turkey (Tubitak 118Y365)”

1. David Douglas November 15, 2020 at 17:25

   November 15, 2020

   The first CMIP6 netCDF file I attempted to process with this script failed.

   http://cmip.bcc.cma.cn/thredds/fileServer/cmip6_data/AerChemMIP/BCC/BCC-ESM1/ssp370/r1i1p1f1/SImon/siconc/gn/v20200219/siconc_SImon_BCC-ESM1_ssp370_r1i1p1f1_gn_201501-205512.nc

   I am not a proficient R programmer, but as far as I can deduce, the R script appears to have problems with:
   1) the latitude grid spacing in the input netCDF is not uniform – latitudes are more dense near the equator compared to the poles.;
   2) the input netCDF file does not have “rlat” and “rlon” variables;
   3) the R script fails to recognize that the time value units = “days since 2015-01-01”

   Kind regards,
   David
2. omer burak akgun Post authorNovember 18, 2020 at 16:42

   Dear David,

   The answer the questions are as follows:

   1) The code consider the closest grid available in CMIP model to your coordinates; therefore, grid spacing is not an issue. Namely, whether the grids are closely spaced or not, the code would extract the nearest grid.

   2) The code works only for the model with rotated coordinates. This issue is also explained in video.

   3)I do not understand why it fails. Can you send an e-mail about the error? For my models, I can extract the data up to 2100.

   Best Wishes,
   Burak
3. Chandra May 3, 2021 at 10:25

   Dear sir,

   I have use the same script provided in your website, however, I have following error. How can I correct it?

   dataext(direct,calender,coordexcel,parameter)
   Loading required package: sp
   [1] “vobjtovarid4: error #F: I could not find the requsted var (or dimvar) in the file!”
   [1] “var (or dimvar) name: rlat”
   [1] “file name: pr_Amon_CNRM-CM5_historical_r1i1p1_185001-189912.nc”
   Error in vobjtovarid4(nc, varid, verbose = verbose, allowdimvar = TRUE) :
   Variable not found

   Thank you.
4. Chandra May 3, 2021 at 12:15

   dataext(direct,calender,coordexcel,parameter)
   Loading required package: sp
   [1] “vobjtovarid4: error #F: I could not find the requsted var (or dimvar) in the file!”
   [1] “var (or dimvar) name: rlat”
   [1] “file name: pr_Amon_CNRM-CM5_historical_r1i1p1_185001-189912.nc”
   Error in vobjtovarid4(nc, varid, verbose = verbose, allowdimvar = TRUE) :
   Variable not found

   *** In my “file name: pr_Amon_CNRM-CM5_historical_r1i1p1_185001-189912.nc”, there are no “rlat” and “rlon” as viewed in panoply. How can i work with this?
5. Tamene Adugna Demissie September 17, 2021 at 20:57

   [1] “vobjtovarid4: error #F: I could not find the requsted var (or dimvar) in the file!”
   [1] “var (or dimvar) name: rlat”
   [1] “file name: pr_day_MPI-ESM1-2-HR_ssp245_r1i1p1f1_gn_20400101-20441231.nc”
   Error in vobjtovarid4(nc, varid, verbose = verbose, allowdimvar = TRUE) :
   Variable not found
6. omer burak akgun Post authorSeptember 23, 2021 at 19:22

   Hello,

   Unfortunately, this code only works for the models used rlat and rlon as coordinates. You should try another model.

   Regards
7. omer burak akgun Post authorSeptember 23, 2021 at 19:23

   Hello,

   Please make sure that your model includes rlat and rlon variables.

   Regards