Notes about this data set (by Sean Davis):
- Data set size: ~26 GB
- Reanalyses included are CFSR, ERA-I, JRA-25, JRA-55, and MERRA
- Variables include T (variable name ta), u (ua), v (va), O3 (tro3), WV (hus), and GPH (zg)
- Data are based off of the ana4mips data set
- Data are on a 2.5 deg x 2.5 deg grid
- All values are monthly means
- Pressure levels are (1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 7, 5, 3, 2, 1, 0.7, 0.5, 0.3, 0.1 hPa)
- 3 time periods are provided:
- The "full" time period (different for each reanalysis)
- The "S-RIP base period" (i.e., 197901-201312)
- The "climatology" period (198101-201012)
- Both 3D (lon,lat,level) and zonal mean 2D (lat, level) files are provided
- Both timeseries and climatology data are provided. Files with "ltm" in the name are climatologies
- Reanalysis "Ensemble" files are located in the /ensemble directory (See note below*)
- Data should be considered to be in “beta” form as they have not undergone extensive QC. Please report any problems to Sean Davis (see above)
*Regarding the "ensemble" data - I highly recommend using the "ensemble" files in the "ensemble" folder for climatological intercomparisons.
You can use a single file (e.g., hus_Amon_reanalysis_ENS_198101-201012.cg.ltm.nc for water vapor) that contains the climatologies for each reanalysis.
The data in these files are of dimension (lon, lat, level, "record"), where record 0 = CFSR, 1=ERA-I, 2=JRA-25, 3=JRA-55, and 4=MERRA.
There is also a corresponding "ensemble mean" file (e.g., hus_Amon_reanalysis_ENS_198101-201012.cg.ltm.ensmean.nc) that is simply the ensemble mean climatology from the 4 core reanalyses (CFSR, ERA-I, JRA-55, MERRA — EXCLUDING JRA-25).
You may use the following wget command to get all data:
wget -Nr ftp://srip:PASSWORD@ftpshare.al.noaa.gov/cgv2/*
(You need to replace "PASSWORD" with the actual password.)