The CPC/ACDB analyses are a combination of several individual analyses. The data are on a global 5 lon x 2 lat grid, at 18 pressure levels, up to .4 hPa. Click here to see more information about these analyses.
These data are converted to GrADS format in near real-time at the Goddard DAAC. Click here to get recent analyses via anonymous FTP.
Currently only a few days of data are available. The 15 years of
historical data in df Format will be converted into GrADS format by
the end of 1995.
History
Click here to see more information about these analyses.
These data are generated every morning at the DAAC using the CPC/ACDB Analyses in df format.
Contents
The data are gridded 5 lon x 2 lat (72 x 91). There are 18 pressure levels in the 3D files, they are: 1000, 850, 700, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 10, 5, 2, 1, and 0.4 mb.
In all cases, each field is in it's own file. There is one file per field per day. It represents a 12Z analysis for that day. The data starts November 26th, 1979, and runs to the present. There will be 15 full years of data at the end of this year.
The parameters have a "DF Name" which is inappropriate for use in grads due to the underscores. So the parameters are renamed when the data are converted into GrADS format.
Name Levels Description hght 18 Geopotential Height tmpu 18 Temperature ubal 18 Balanced Zonal Wind vbal 18 Balanced Meridional Wind epbl 18 Ertel's Potential Vorticity from Measured winds rvbl 18 Relative Vorticity from Balanced Winds ptrp 1 Tropopause Pressure ttrp 1 Tropopause Temperature
These data are currently located on a DAAC anonymous FTP site.
The data format in which these data are created in Code 916 employs a packing scheme that is not available in HDF. Therefor the original files only take up half the space. The numbers below apply for the HDF version of the data (and also any flat binary representation of the data).
Recall that each parameter comes in it's own daily files. There are two 2D parameters (tropopause temperature and tropopause pressure) and six 3D paramters.
daily monthly yearly 15 years
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any 2D parameter 29 KB .9 MB 10.5 MB .16 GB
any 3D parameter 475 KB 14.3 MB 171.0 MB 2.70 GB
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all parameters 2 908 KB 87.2 MB 1 046.9 MB 15.70 GB
These data will be distributed via a DAAC
anonymous FTP site.
Current Status
Only a few days of data have been generated. Testing of the automatic
conversion process is ongoing.
Future Plans
When near-real-time data is being transfered and converted smoothly, the 15 years of historical data will be converted and added to the anonymous ftp archive.