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
- 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)
|
