ECMWF's Reanalysis Data (2.5 x 2.5 degree resolution)
General information about this
dataset
- The ECMWF Reanalysis is a global analysis of 15 years' worth
of data.
- Archives are from Jan 1979 through Dec 1993.
- Data are archived on a 2.5 x 2.5 degree lat/lon grid, in GRIB
format.
- Surface fields:
- 3D analysis fields:
- Peculiarities/Caveats:
- 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.
- Geopotential must be converted to geopotential height by
REGRID. Thus, both geopotential and geopotential height
must be specified in the Vtable. See the sample Vtable
linked below.
- ECMWF uses different parameter tables (i.e., GRIB code numbers)
than NCEP for many variables.
- NOTE - Usage of this dataset is
restricted: [NCAR/DSS]
may distribute this data to US scientists, scientists visiting
US organizations, and Canadian scientists affiliated with UCAR
member organizations only. This data must not be
used for commercial purposes. ECMWF must be given credit
in any publications in which this data is used. A permission
form must be signed and returned to DSS for use of this
data.
- For further information about the ECMWF Reanalysis archives
at NCAR, see dss.ucar.edu/pub/ec-reanalysis.html.
How to use this dataset with pregrid
Is this data available to ALL users
- NO, this dataset is not generally available to all users.
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/era/get_era.csh
- OR use the script available from ~mesouser/MM5V3/Util/get_era.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 get the following
data files for the SOC case:
- ERA_GRIB_SFC.1993JAN00Z
- ERA_GRIB_SFC.1993JAN06Z
- ERA_GRIB_SFC.1993JAN12Z
- ERA_GRIB_SFC.1993JAN18Z
- ERA_GRIB_UPA.1993MAR00Z
- ERA_GRIB_UPA.1993MAR06Z
- ERA_GRIB_UPA.1993MAR12Z
- ERA_GRIB_UPA.1993MAR18Z
- Note that for upperair data (*UPA), you
get the data for the periods selected for the month (i.e.,
all 00 UTC data are in file date-stamped with 1993MAR00Z),
while for the surface fields (*SFC), you get files either
date-stamped for Jan or July, since 6 monthly data are archived
together.
- 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 MSS-file-list
for the surface data
- Find the file name(s) appropriate for your case (look for
year and months). For example, for the March 1993 SOC case,
you will need to obtain:
- Y35012 1993jan01-1993jun30 00Z;
- Y35015 1993jan01-1993jun30 06Z;
- Y35018 1993jan01-1993jun30 12Z, and
- Y35021 1993jan01-1993jun30 18Z
- Then view the MSS-file-list
for the 3D analysis data
- Find the file name(s) appropriate for your case (look for
year and months). For example, for the March 1993 SOC case,
you will need to obtain:
- Y35464 1993mar 00Z;
- Y35644 1993mar 06Z;
- Y35824 1993mar 12Z, and
- Y36004 1993mar 18Z
- Log on to NCAR's IBM or other computer.
- cd to /ptmp/$USER
- Obtain the file using this command:
- msread -f BI Y35012 /DSS/Y35012
- 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.
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