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Last updated: 04/12/2017
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The current version of the EN4 dataset is EN.4.2.1. This will be updated each month with new data. Profiles and analyses are available with two different time varying bias adjustments applied to mechanical and expendible bathythermograph (MBT and XBT) data. Please contact us if you have a particular requirement that is not met by these data.
EN.4.2.0 is relatively similar to its sucessor, EN.4.2.1, but EN.4.2.1 removes the problem that caused unrealistic temperatures to be seen in the Labrador Sea between 1988 and 1990. EN.4.2.1 was also built from a fresh download of the source data.
Profile data and objective analyses are available:
EN.4.1.1 is again similar to EN.4.2.1, but with less up to date source data. EN.4.1.1 had psu as the units of practical salinity which has been changed to be unitless in EN.4.2.1. The uncertainties in temperature analyses for EN.4.1.1 had 273.15 added to all values, this was been corrected in EN.4.2.0 and remains corrected in EN.4.2.1 and therefore temperature uncertainties can now be read directly from the netCDF files.
Profile data and objective analyses are available:
EN.4.1.0 is identical to its successor, EN.4.1.1, except that all
observations in the Black Sea were automatically rejected. This automatic
rejection had also been present in the previous versions of the dataset.
Following user feedback it was removed and the dataset reprocessed to make
EN.4.1.1. Please get in touch if you would like it use this version.
Profile data and objective analyses are available:
Data with time varying XBT and MBT bias adjustmentsOnly profile data are available:
The main changes compared to the previous version of the dataset (EN4.0.1) are:
Additionally, EN4.0.1 onwards include the following improvements relative to EN3 v2a, which are described in more detail in Good et al. (2013):
Two older versions of the EN4 dataset are also available for download:
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.
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.
Gouretski, V. and F. Reseghetti, 2010. On depth and temperature biases in bathythermograph data: Development of a new correction scheme based on analysis of a global ocean database, Deep-Sea Research I, 57, 812-833, doi:10.1016/j.dsr.2010.03.011
Ishii, M. and M. Kimoto, 2009. Reevaluation of Historical Ocean Heat Content Variations with Time-Varying XBT and MBT Depth Bias Corrections, Journal of Oceanography, 65, 287-299.
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