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

Jones (CRU) Air Temperature Anomalies Version 4: CRUTEM4

Note, data has been converted from netCDF3 to netCDF4 classic.See our netCDF4 help page for more information.

Brief Description: Global gridded (5°x5°) monthly anomalies of observed air temperature and combined observed air and marine temperature (HADCRU4) from the mid 1800's to near present.Current version is V4.2.0 which was put out 5/9/2013. More Details... Temporal Coverage: Monthly anomalies and statistics from 1850/01 to near present. Spatial Coverage: 5.0 degree latitude x 5.0 degree longitude global grid (72x36). 87.5S - 87.5N, 177.5W - 177.5E.

Levels:

• Surface

Update Schedule:

• Monthly

Download/Plot Data: (FTP Access)

Archive parameters: File names are composed of variable abbreviations and statistic name:

(variable).(time).(statistic).nc

Variable	Statistic	Level	Download File	Create Plot/Subset
Air Temperature	Anomaly	Surface	air.mon.anom.nc
Air Temperature	NOBS	Surface	air.mon.anom.nobs.nc
Air Temperature	Sampling Error	Surface	air.mon.anom.samplingerror.nc
Air Temperature	Station Error	Surface	air.mon.anom.stationerror.nc
Air Temperature	2.5 bias	Surface	air.mon.anom.biased2.5.nc
Air Temperature	97.5 bias	Surface	air.mon.anom.biased97.5.nc
Air Temperature: Variance adjusted	Anomaly	Surface	air.mon.anom.nc
Air temperature (from Hadcrut2!)	monthly long term mean	Surface	air.mon.ltm.nc

Usage Restrictions:

None

Detailed Description:

• See the Hadley Centre for more details. This version is 4.1.1. The air temperature page is from monthly station temperature time series. A version that is variance corrected (CRUTEM4V) is available. The technique for the variance adjusted dataset can be found at Jones et. al (2001).
  Note the companion dataset HADCRUT4 Combined Air Temperature/SST Anomalies. Also note that if you would like a climatology, there is a 1961-1990 LTM file based on the HADCRUT2V data.
• Related Datasets
  • MLOST (NOAA Air Temperature Anomalies)
  • GISTEMP (NASA Air Temperature Anomalies)
  • HADCRUT3 (Combined Air/Marine Temperature Anomalies)
  • CRUTEM3 (Combined Air Temperature Anomalies) (depreciated)
  • NCEP/NCAR Reanalysis (surface air temperature)
  • NCEP Operational Analysis (surface temperature)
  • U Delaware (air temperature)

Caveats:

• None

Related File Naming & Structure Information:

File Names:

• var.time.stat.nc   (In directory: /Datasets/cru/crutem4/std/)
• var.time.stat.nc   (In directory: /Datasets/cru/crutem4/var/)

Dataset Format and Size:

• PSL standard NetCDF ~20 Mbytes file for each monthly file.
• PSL standard NetCDF .13 Mbytes file the monthly ltm file.

Missing Data:

• -9.96921e+36f.

Citation:

• Jones, P.D., Lister, D.H., Osborn, T.J., Harpham, C., Salmon, M. and Morice, C.P., 2012: Hemispheric and large-scale land surface air temperature variations: an extensive revision and an update to 2010. Journal of Geophysical Research, doi:10.1029/2011JD017139.
• Please note: If you acquire CRUTEM4 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 CRUTEM4 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 CRUTEM4 data set freely available online in the future. Thank you!

References:

• Jones, P.D., Lister, D.H., Osborn, T.J., Harpham, C., Salmon, M. and Morice, C.P., 2012: Hemispheric and large-scale land surface air temperature variations: an extensive revision and an update to 2010. Journal of Geophysical Research, doi:10.1029/2011JD017139.
• Brohan, P., J.J. Kennedy, I. Harris, S.F.B. Tett and P.D. Jones, 2006: Uncertainty estimates in regional and global observed temperature changes: a new dataset from 1850. J. Geophysical Research 111, D12106, doi:10.1029/2005JD006548
• Jones, P.D., Osborn, T.J., Briffa, K.R., Folland, C.K., Horton, B., Alexander, L.V., Parker, D.E. and Rayner, N.A., 2001: Adjusting for sampling density in grid-box land and ocean surface temperature time series. J. Geophys. Res. 106, 3371-3380.

Original Source:

• CRU http://www.cru.uea.ac.uk/cru/data/temperature/ (created dataset).
• Hadley Centre: http://hadobs.metoffice.com/crutem4/ (archive of dataset).

Contact:

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