NCEP/NCAR Reanalysis 1:Other Flux
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One-Line Description:
- NCEP/NCAR Reanalysis 1
Temporal Coverage:
- 4-times daily, daily and monthly values for 1948/01/01 to present
- Long term monthly means, derived from data for years 1968 - 1996
Spatial Coverage:
- T62 Gaussian grid with 192x94 points
- 88.542N-88.542S, 0E-358.125E
- All data are stored in netCDF files
- The data are divided by variable and year into separate files
- There are 492 files currently
- Files 52 Mbytes per variable per year
- Current total of 25.8 Gbytes for 4xDaily and 6.5 Gbytes for daily averages
Levels:
- ntat: Nominal top of atmosphere
- eatm: Entire atmosphere
- hcb: High cloud bottom
- hct: High cloud top
- lcb: Low cloud bottom
- lct: Low cloud top
- mcb: Middle cloud bottom
- mct: Middle cloud top
Update Schedule:
- Daily
Note: All of these variables are six hour averages for the period of the reference time plus six hours.
Variable | Statistic | Level | Download File | Create Plot/Subset |
---|---|---|---|---|
Clear sky upward longwave flux | 4-times Daily | NTAT | see list | |
Clear sky upward longwave flux | Daily | NTAT | see list | |
Clear sky upward solar flux | 4-times Daily | NTAT | see list | |
Clear sky upward solar flux | Daily | NTAT | see list | |
Downward solar radiation flux | 4-times Daily | NTAT | see list | |
Downward solar radiation flux | Daily | NTAT | see list | |
Pressure at high cloud bottom | 4-times Daily | HCB | see list | |
Pressure at high cloud bottom | Daily | HCB | see list | |
Pressure at high cloud top | 4-times Daily | HCT | see list | |
Pressure at high cloud top | Daily | HCT | see list | |
Pressure at low cloud bottom | 4-times Daily | LCB | see list | |
Pressure at low cloud bottom | Daily | LCB | see list | |
Pressure at low cloud top | 4-times Daily | LCT | see list | |
Pressure at low cloud top | Daily | LCT | see list | |
Pressure at middle cloud bottom | 4-times Daily | MCB | see list | |
Pressure at middle cloud bottom | Daily | MCB | see list | |
Pressure at middle cloud top | 4-times Daily | MCT | see list | |
Pressure at middle cloud top | Daily | MCT | see list | |
Total cloud cover | 4-times Daily | EATM | see list | |
Total cloud cover | Daily | EATM | see list | |
Upward longwave radiation flux | 4-times Daily | NTAT | see list | |
Upward longwave radiation flux | Daily | NTAT | see list | |
Upward solar radiation flux | 4-times Daily | NTAT | see list | |
Upward solar radiation flux | Daily | NTAT | see list |
Usage Restrictions:
- None
Detailed Description:
- The NCEP/NCAR Reanalysis 1 project is using a state-of-the-art analysis/forecast system to perform data assimilation using past data from 1948 to the present. A large subset of this data is available from PSD in its original 4 times daily format and as daily averages. However, the data from 1948-1957 is a little different, in the regular (non-Gaussian) gridded data. That data was done at 8 times daily in the model, because the inputs available in that era were available at 3Z, 9Z, 15Z, and 21Z, whereas the 4x daily data has been available at 0Z, 6Z, 12Z, and 18Z. These latter times were forecasted and the combined result for this early era is 8x daily. The local ingestion process took only the 0Z, 6Z, 12Z, and 18Z forecasted values, and thus only those were used to make the daily time series and monthly means here.
Caveats:
- Please read the problem list before using the data.
Related File Naming & Structure Information:
File Names:
-
Archive parameters: File names are composed of variable abbreviations,
- level, and year: (variable).(level).gauss.(year).nc
- See individual sections. Data in /Datasets/ncep.reanalysis/, Datasets/ncep.reanalysis.dailyavgs/, /Datasets/ncep.reanalysis.derived/
- 4x daily data are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis/other_gauss/.
- The 4x data files are quite large, so you may only be able to download them if you have a fast network connection.
- Daily averages are available from ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis.dailyavgs/other_gauss/.
Dataset Format and Size:
- PSD standard NetCDF most are (packed).
- All data are stored in netCDF files
- The data are divided by variable and year into separate files
- There are 492 files currently
- Files 52 Mbytes per variable per year
- Current total of 25.8 Gbytes for 4xDaily and 6.5 Gbytes for daily averages
- If you would like datasets on a media such as tape, you will need to get them from another institution. NCAR (link) provides such a service for their datasets.
Missing Data:
- None now. The following dates in 2002 and 2003 were missing for the
tcdc variable, but were filled in on 2003/05/02. You may wish to re-FTP
these files. Missing dates for tcdc:
2002/01/14, 2002/04/21, 2002/05/08, 2002/06/24, 2002/10/25, 2002/11/26, 2003/02/23, 2003/03/25
Citation:
- For dataset source, please cite:Kalnay et al.,The NCEP/NCAR 40-year reanalysis project, Bull. Amer. Meteor. Soc., 77, 437-470, 1996.
- Please note: If you acquire NCEP Reanalysis data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as NCEP Reanalysis data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.cdc.noaa.gov/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the NCEP Reanalysis data set freely available online in the future. Thank you!
References:
- March, 1996 BAMS
Original Source:
- NOAA National Center for Environmental Prediction
Contact:
- Physical Sciences Division: Data Management
NOAA/ESRL/PSD
325 Broadway
Boulder, CO 80305-3328
esrl.psd.data@noaa.gov