ERA5 Modes of Interannual Variability

This dataset represents a suite of climate diagnostics for 56 variables relating to the interannual variability of ECMWF ERA5 monthly mean data. Basic fields for each of these variables include a monthly mean climatology and standard deviation, corresponding anomalies spanning 40 or more years of data, empirical orthogonal functions (EOFs), principal component (PC) time series, percent variance explained by each EOF, and an estimate of the standard error of the percent variance explained. Dominant modes of variability include El Nino Southern Oscillation (ENSO) in sea surface temperature, and the Antarctic Oscillation (AO) and North Atlantic Oscillation (NAO) in surface pressure. Separate analyses are performed for the entire globe, northern hemisphere only, and southern hemisphere only. There is sufficient information to further explore lagged correlations, teleconnections, and more advanced statistical techniques. Preparation and calculation of this dataset is performed by CISL DECS at NCAR.

To Access Resource:

Questions? Email Resource Support Contact:

  • Dave Stepaniak
    UCAR/NCAR - Research Data Archive

Temporal Range

  • Begin:  1979-01-01T00:00:00Z
    End:  2018-12-01T00:00:00Z


Resource Type dataset
Temporal Range Begin 1979-01-01T00:00:00Z
Temporal Range End 2018-12-01T00:00:00Z
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Related Resource #1 : Copernicus Climate Data Store (CDS)

Additional Information N/A
Resource Format NetCDF4 (Binary)
Standardized Resource Format NetCDF
Asset Size 139105 MB
Legal Constraints

Use of this dataset is subject to UCAR's Terms of Use, except that commercial use is generally not prohibited.

Access Constraints Registration on the RDA web site is a requirement for access to the data.
Software Implementation Language N/A

Resource Support Name Dave Stepaniak
Resource Support Email
Resource Support Organization UCAR/NCAR - Research Data Archive
Distributor NCAR Research Data Archive
Metadata Contact Name N/A
Metadata Contact Email
Metadata Contact Organization NCAR Research Data Archive

Author Stepaniak, David P.
Shih, Chi-Fan
Publisher Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory
Publication Date 2020-02-28
Digital Object Identifier (DOI)
Alternate Identifier ds633.3
Resource Version N/A
Topic Category climatologyMeteorologyAtmosphere
Progress onGoing
Metadata Date 2024-01-03T15:11:53-07:00
Metadata Record Identifier edu.ucar.rda::ds633.3
Metadata Language eng; USA
Suggested Citation Stepaniak, David P., Shih, Chi-Fan. (2020). ERA5 Modes of Interannual Variability. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. Accessed 22 June 2024.

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