You can see and clone these tools at https://git.ecmwf.int/users/dako/repos/tools/browse.

Convert CCI Snow to GRIB at TCo1279

• https://git.ecmwf.int/users/dako/repos/tools/browse/convert_cci
  • download_[http,ftp].sh: download the CryoClim snow cover from the website or the FTP site
  • convert.sh: convert the original NetCDF files to GRIB files at a resolution of TCo1279 and plot the snow cover fraction
• The converted GRIB files are used in the offline LDAS for SEAS6 reforecasts

Convert IMS to GRIB at TCo1279

• https://git.ecmwf.int/users/dako/repos/tools/browse/convert_ims
  • download.sh: download the IMS snow cover from the FTP site
  • convert.sh: convert the original ascii files to GRIB files at a resolution of TCo1279 and plot the snow cover fraction
• The converted GRIB files are used in the offline LDAS for SEAS6 reforecasts

Climatological snow cover fraction based on IMS

• https://git.ecmwf.int/users/dako/repos/tools/browse/clim_ims
  • mk_clim.sh: create climatological snow cover fraction based on IMS from 2006 to 2020 (15 years), at first TCo1279 then converted to 0.05 degrees
• Used in the offline LDAS for SEAS6 reforecasts (TCo1279)
• Used for quality control of the CCI Snow to be assimilated in ERA6 (0.05 degrees)

Encode BUFR from CCI Snow for ERA6

• https://git.ecmwf.int/users/dako/repos/tools/browse/encode_cci
  • orog.sh: copy the orography file at TCo3999 and convert it to 0.05 degrees by the command below (to avoid MEMKILL)

srun -c 32 --mem=64GB ./orog.sh

• • encode_cci.sh: encode BUFR files from the original NetCDF files (QC is applied here using the climatological SCF above)
• The encoded BUFR is used for 

Snow tracker

• https://git.ecmwf.int/users/dako/repos/tools/browse/snow_tracker
  • get_lsm.sh: retrieve land-sea mask
  • get_era5.sh: retrieve snow water equivalent in ERA5 and apply mask for sea and glacier
  • make_eachyear.sh: merge GRIB files to make time series of each year
  • make_norm.sh: make normal values for each date (from 2005 and 2020, post IMS period)
  • plot.sh: plot time series of snow water equivalent for each year by gigaton
• This plot is used for annual snow assessment at Global Cryosphere Watch: https://globalcryospherewatch.org/assessments/snow/

Convert in situ snow observations to GRIB at TCo1279

• https://git.ecmwf.int/users/dako/repos/tools/browse/convert_synop
  • retreive_odb.sh: retrieve in situ snow depth observations from ODB
  • convert_odb.sh: make daily averaged snow depth observations on the model grids at TCo1279
• Used for the validation of snow cover products below

Validate snow cover products against in situ observations

• https://git.ecmwf.int/users/dako/repos/tools/browse/verif_snowcover
  • verif.sh: calculate thread score for the IMS and CryoClim snow cover against in situ observations