NCEP reanalysis datasets (1948-2018)

1) The data set is composed of global atmospheric reanalysis data jointly produced by the National Centers for Environmental Prediction (NCEP) and the National Center for Atmospheric Research (NCAR). These grid data are generated by reanalysing the global meteorological data from 1948 to present by applying observation data, forecasting models and assimilation systems. The data variables include surface, near-surface (.995 sigma layer) and multiple meteorological variables in different barospheres, such as precipitation, temperature, relative humidity, sea level pressure, geopotential height, wind field, heat flux, etc.

2) The coverage time is from 1948 to 2018, and the data from 1948 to 1957 are non-Gaussian grid data. The data cover the whole world. The spatial resolution is a 2.5° latitude by 2.5° longitude grid. The vertical resolution is a 17-layer standard pressure barosphere, with layer boundaries at 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, and 10 hPa, and 28 sigma levels. Some variables are calculated for 8 layers (omega) or 12 layers (humidity), with temporal resolutions of 6 hours, daily, monthly or a long-term monthly average (from 1981 to 2010). The daily data are obtained by averaging the daily values of 0Z, 6Z, 12Z and 18Z.

3) Missing values are assigned a value of -9.99691e+36f. The data are stored in the .nc format with the file name, and each file includes data on latitude, longitude, time, and atmospheric variables.

For detailed data specifications, please visit

Required Data Citation View Data Cite Help About Data Citation
Cite as:

National Oceanic and Atmospheric Administration, National Center for Atmospheric Research. NCEP reanalysis datasets (1948-2018). National Tibetan Plateau Data Center, 2018. doi: 10.11888/Meteoro.tpdc.270922. (Download the reference: RIS | Bibtex )

Related Literatures:

1. Kalnay,E., Kanamitsu,M., Kistler,R., Collins,W.D., Deaven,D.G., Gandin,L.S., Iredell, M., Saha, S., White, G., Woollen, J., Zhu, Y., Chelliah, M., Ebisuzaki, W., Higgins, W., Janowiak, J., Mo, K.C., Ropelewski, C., Wang, J., Leetmaa, A., Reynolds, R., Jenne, R., & Joseph, D. (1996).The NCEP/NCAR 40-year reanalysis project. Bulletin of the American Meteorological Society, 77(3), 437-470.( View Details | Bibtex)

Using this data, the data citation is required to be referenced and the related literatures are suggested to be cited.

Support Program

CASEarth:Big Earth Data for Three Poles(grant No. XDA19070000) (No:XDA19000000)

User Limit

To respect the intellectual property rights, protect the rights of data authors,expand servglacials of the data center, and evaluate the application potential of data, data users should clearly indicate the source of the data and the author of the data in the research results generated by using the data (including published papers, articles, data products, and unpublished research reports, data products and other results). For re-posting (second or multiple releases) data, the author must also indicate the source of the original data.

Example of acknowledgement statement is included below: The data set is provided by National Tibetan Plateau Data Center (

License: This work is licensed under an Attribution 4.0 International (CC BY 4.0)

Related Resources

Sign In to add comments

Download Follow
Geographic coverage
East: 180.00 West: -180.00
South: -90.00 North: 90.00
  • Temporal resolution: Daily
  • File size: 30,310 MB
  • Browse count: 2,752 Times
  • Apply count: 33 Times
  • Share mode: online
  • Temporal coverage: 1948-01-01 To 2018-12-31
  • Updated time: 2019-08-03
Contact Information
: National Oceanic and Atmospheric Administration   National Center for Atmospheric Research  

Distributor: National Tibetan Plateau Data Center


Export metadata