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Sample Data

Analysis Data

Observational Data

 


 

NCEP/NCAR Reanalysis Data (2.5 x 2.5 degree resolution)


General information about this dataset

  • This data set is a global analysis beginning in 1948 using a single analysis system for the entire dataset
  • Analyses are available every six hours
  • Data are archived on a 2.5 x 2.5 degree lat/lon grid and a gaussian grid (~1.9 degrees lat, 2.5 degrees lon)
  • For information:
  • Peculiarities/Caveats:
    • Much of the surface data are actually six-hour forecasts.
    • Sea-surface temperature is not archived. 
    • Skin temperature may be used with some caution.  Be aware that ground temperatures and sea-surface temperatures at coastlines may be unrealistic.
    • This dataset may be used to generate data to use with the Noah LSM

How to use this dataset with pregrid

Is this data available to ALL users

  • NNRP data for the last year is available to ALL users:
    • 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
    • To obtain the data, download both the *.pgb.f00.tar and *.grb2d.tar files for the time you are interested in from the above web site
    • Untar the files before use
    • The *.grb2d.tar files (containing the surface data), once untarred, will be in the format grb2dYYMMDDHH. Thus all the 2D fields are group together for each time period. This difference from downloading the files automatically, where we extract each 2D field separately for a full month. This is still the same fields, just stored differently.

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/nnrp/get_nnrp.csh
    • OR use the script available from ~mesouser/MM5V3/Util/get_nnrp.csh
       
  • When you run this scripts make sure that you work in a temporary directory (such as /tmp/$USER, or /ptmp/$USER on IBM).
    • If your job is successful, you should receive the following files (example, for the SOC case):
        

    ICECsfc.9303

    TMPdlr.200.9303

    pgb.f0093031300

     

    LANDsfc.9303

    TMPdpl.300.9303

    pgb.f0093031306

     

    PRESsfc.9303

    TMPhag.2.9303

    pgb.f0093031312

     

    SOILWdlr.10.9303

    TMPsfc.9303

    pgb.f0093031318

     

    SOILWdlr.200.9303

    UGRDhag.10.9303

    pgb.f0093031400

     

    SPFHhag.2.9303

    VGRDhag.10.9303

     

    TMPdlr.10.9303

    WEASDsfc.9303

    • Note that the 3D fields (pgb* files) contain data for the time periods you selected. But the surface data files, contain information for the entire month you are interested in.  
       
  • 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 inventories for the NCEP/NCAR Reanalysis data
  • Find the data file name(s) from these online inventories. For example:
    • If you wanted a day in January 2003, you will need the the data file names (VSN number as they are referred to) A21909 (0301.2D, containing the 2D data sets) and A21911 (0301.pgb.f00, containing the 3D analysis data)
  • Log on to IBM
  • cd to /ptmp/$USER
  • type the following to obtain the data:
    • msread  -f BI  surface.0301  /DSS/A21909
    • msread  -f BI  analysis.0301  /DSS/A21911
  • surface.0301 and analysis.0301 are tar files:
    • Once untarred, you will get the "pgb*" and surface files you need
    • These tar files contain more data that what is needed by the MM5 model. You only need to use the following files:
        

    ICECsfc.YYMM

    TMPdlr.200.YYMM

    pgb.f00YYMMDDHH

     

    LANDsfc.YYMM

    TMPdpl.300.YYMM

    pgb.f00YYMMDDHH

     

    PRESsfc.YYMM

    TMPhag.2.YYMM

    pgb.f00YYMMDDHH

     

    SOILWdlr.10.YYMM

    TMPsfc.YYMM

    pgb.f00YYMMDDHH

     

    SOILWdlr.200.YYMM

    UGRDhag.10.YYMM

    pgb.f00YYMMDDHH

     

    SPFHhag.2.YYMM

    VGRDhag.10.YYMM

     

    TMPdlr.10.YYMM

    WEASDsfc.YYMM

  • Move the files to where you are going to use it (remember if you are using ftp, move the file with "binary" mode)
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