On this page: Temporal Coverage | Spatial Coverage | Levels | Update Schedule | Download/Plot Data | Analysis Tools
Restrictions | Details | Caveats | File Naming | Citation | References | Original Source | Contact

NCEP-DOE Reanalysis 2: Pressure Level

Other Grid Types: NCEP Reanalysis2 Main Page | Pressure Level Data | Surface Data | Gaussian Grid Data | Spectral Coefficents Data

Brief Description:

• NCEP-DOE Reanalysis 2 is an improved version of the NCEP Reanalysis I model that fixed errors and updated paramterizations of of physical processes

Temporal Coverage:

• 4-times and monthly values for 1979/01/01 to 2021/03/31 .

Spatial Coverage:

• 2.5-degree latitude x 2.5-degree longitude global grid (144x73).
• 90N - 90S, 0E - 357.5E

Levels:

• 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10mb

Update Schedule:

• Updates adding the previous year's data occur during the first quarter of the next

See our data FAQ on why there is no specific humidity in R2

Download/Plot Data: (Download Issues)

Variable	Statistic	Level	Download File	Create Plot/Subset
Air Temperature	4-times Daily Values	1000-10mb	See list
Air Temperature	Daily Mean	1000-10mb	See list
Air Temperature	Monthly Mean	1000-10mb	air.mon.mean.nc
Geopotential Height	4-times Daily Values	1000-10mb	See list
Geopotential Height	Daily Mean	1000-10mb	See list
Geopotential Height	Monthly Mean	1000-10mb	hgt.mon.mean.nc
Relative Humidity	4-times Daily Values	1000-10mb	See list
Relative Humidity	Daily Mean	1000-10mb	See list
Relative Humidity	Monthly Mean	1000-10mb	rhum.mon.mean.nc
Omega	4-times Daily Values	1000-10mb	See list
Omega	Daily Mean	1000-10mb	See list
Omega	Monthly Mean	1000-10mb	omega.mon.mean.nc
u-wind	4-times Daily Values	1000-10mb	See list
u-wind	Daily Mean	1000-10mb	See list
u-wind	Monthly Mean	1000-10mb	uwnd.mon.mean.nc
v-wind	4-times Daily Values	1000-10mb	See list
v-wind	Daily Mean	1000-10mb	See list
v-wind	Monthly Mean	1000-10mb	vwnd.mon.mean.nc

Usage Restrictions:

• None

Detailed Description:

• The NCEP-DOE Reanalysis 2 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1979 through the previous year. A large subset of this data is available from PSL in its original 4 times daily format and as daily averages.

Caveats

• None for pressure level data.

Related File Naming & Structure Information:

File Names:

• var.time.stat.nc   (In directory: /Datasets/ncep.reanalysis2/pressure)
• var.time.stat.nc   (In directory: /Datasets/ncep.reanalysis2.dailyavgs/pressure)
• var.stat.nc   (In directory: /Datasets/ncep.reanalysis2.derived/pressure)

Dataset Format and Size:

• All data are stored in NetCDF files
• Data is packed in those files.
• There are 276 files currently
• Sizes range from 51 Mbytes to 521 Mbytes per variable per year
• The 4x data files are quite large, so you may only be able to download them if you have a fast network connection.
• Current total of 68 Gbytes for 4xDaily and 17 Gbytes for daily averages

• By anonymous FTP:
• 4x daily data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2/pressure/.
• Daily data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2.dailyavgs/pressure/.
• Monthly data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis2.dailyavgs/pressure/.

Missing Data:

• Missing data is flagged with a value of 32767s.

Citation:

• Please note: If you acquire NCEP-DOE Reanalysis 2 data products from PSL, we ask that you acknowledge us in your use of the data. This may be done by including text such as NCEP-DOE Reanalysis 2 data provided by the NOAA/OAR/ESRL PSL, Boulder, Colorado, USA, from their Web site at / in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSL to justify keeping the NCEP-DOE Reanalysis 2 data set freely available online in the future. Thank you!

References:

• http://www.cpc.ncep.noaa.gov/products/wesley/reanalysis2/kana/reanl2-1.htm
• NCEP-DOE AMIP-II Reanalysis (R-2): M. Kanamitsu, W. Ebisuzaki, J. Woollen, S-K Yang, J.J. Hnilo, M. Fiorino, and G. L. Potter. 1631-1643, Nov 2002, Bulletin of the American Meteorological Society.

Original Source:

• NOAA National Centers for Environmental Predictions

Contact:

• Physical Sciences Laboratory: Data Management
  NOAA/ESRL/PSL
  325 Broadway
  Boulder, CO 80305-3328
  psl.data@noaa.gov