Sample Data

Analysis Data

• NCEP GDAS
  

• NCEP Final Analysis
  

• NCEP/NCAR Reanalysis

• NCEP Eta Analyses

• ECMWF TOGA Global Analysis

• ECMWF Reanalysis

• AGRMET

Observational Data

NCEP Global Tropospheric Analysis (1 x 1 degree resolution)

• General information about this dataset
• How to use this dataset with pregrid
• Is this data available to ALL users
• How to download data automatically
• How to download data manually

General information about this dataset

• NCEP Global Analyses on 1x1 degree grids is available every six hours.
• The analyses are from the NCEP Final Analyses (FNL) which currently are the same as the Aviation (AVN) run except that a later input data cutoff time is used.
• For further information about the FNL archives at NCAR:
  • See, http://dss.ucar.edu/datasets/ds083.2.
  • View the sample header output to see which variables are available at each level
• This data is available at NCAR since September 15, 1999
• Information about NCEP model products, including where to find the real-time products, may be found at http://www.emc.ncep.noaa.gov/index.html, in pages such as
  • http://www.emc.ncep.noaa.gov/mmb/research/meso.products.html
  and
  • http://www.emc.ncep.noaa.gov/modelinfo/index.html
• This dataset may be used to generate data to use with the Noah LSM

How to use this dataset with pregrid

• set SRC3D = GRIB
• Use the AVN Vtables provided in pregrid/grib_misc
• Sample Vtable for using the NCEP FNL archives

Is this data available to ALL users

• FNL data for the last year is available to ALL users:
  • http://dss.ucar.edu/datasets/ds083.2/data/
  • This data is kept current with the newest data added when available and data older than one year removed from the site.
  • To obtain the data, download from above web site

How to download data automatically

• This option is only available to users with NCAR accounts
• To obtain the data:
  • use the script in REGRID/pregrid/grib_misc/get_fnl.csh
  • OR use the script available from ~mesouser/MM5V3/Util/get_fnl.csh
• When you run this scripts make sure that you work in a temporary directory (such as /tmp/$USER, or /ptmp/$USER on IBM).
• Once you have downloaded the files from the MSS, you need to ftp the files to your local computer. All files must be transferred with the ftp "binary" mode.

How to download data manually

• This option is only available to users with NCAR accounts
• View the inventory list to find the file name of the date you are interested in. Example:
  • If you are interested in January 15, 2003, view the Jan2003 list
  • You will see a list of file names in the format fnl_year,month_day_hour_analysis - so Jan 15 will be fnl_030115_00_00
• On NCAR's IBM or other machines, obtain the files by using this command:
  • msread fnl_030115_00_00 /DSS/DS083.2/data/fnl_030115_00_00
  • Note: These files are not cos-blocked and therefore you do not need the "-fBI" option to download the files.
  • Note: These files are not tarred up in bundles, so you need to download each time individually.
• To read more about downloading the data, read the file-name note
• Once you have downloaded the files from the MSS, you need to ftp the files to your local computer. All files must be transferred with the ftp "binary" mode.