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EN4: quality controlled subsurface ocean temperature and salinity profiles and objective analyses

Description of the dataset

The EN4 dataset consists of two products:

  • Observed subsurface ocean temperature and salinity profiles with data quality information, and,
  • Objective analyses formed from the profile data with uncertainty estimates.
Data are available from 1900 to the present and there are separate files for each month.

Please read 'Good, S. A., M. J. Martin and N. A. Rayner, 2013. EN4: quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates, Journal of Geophysical Research: Oceans, 118, 6704-6716, doi:10.1002/2013JC009067' for details of how the dataset was constructed.

Feedback and requests for new features

If you have any comments or questions about the data, please get in touch.

New versions of the dataset will be released as required to incorporate new features and new historical data. If you have suggestions for changes to the dataset we would love to hear about them.

Funding acknowledgments

The work to produce this dataset was supported by the Joint DECC/Defra Met Office Hadley Centre Climate Programme (GA01101) and by ERA-CLIM, a collaborative project (2011-2013) funded by the European Union under the 7th Framework Programme.



Positions of profiles in the most recent month of the dataset.

Obtaining the data

Go to download page
Data are made available without charge for the purposes of private study and scientific research, but please read the terms and conditions.
The latest version of the data is EN.4.0.2. Data with adjustments for biases and some previous versions of the EN4 dataset are also available. The predecessor of EN4 is available from the EN3 webpages.

Citing the data

When using the data set in a paper, please quote the version number (for example EN4.0.2), the date the data were downloaded and cite the following:

Good, S. A., M. J. Martin and N. A. Rayner, 2013. EN4: quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates, Journal of Geophysical Research: Oceans, 118, 6704-6716, doi:10.1002/2013JC009067

If using a version of the data that incorporate time varying bias adjustments please consider citing the relevant paper and please also take note of the data sources used to construct EN4 (described in the paper and available from the download page for each version of the dataset) and acknowledge them appropriately.


Contact us

If you cannot find the information you require on these pages, please do contact us. We are also interested in receiving feedback about the data and its usability. See below if your query is of a commercial nature or relates to the media.


Commercial and media enquiries

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