EN4 a newer version is available (EN4.1.1)
the updated version can be found here: http://www.metoffice.gov.uk/hadobs/en4/download-en4-1-1.html
Important information about this dataset:
This is the current version of the dataset. Profiles and analyses with two different sets of bias corrections applied are available: 1) Gouretski and Reseghetti (2010) corrections and 2) Levitus et al (2009) corrections. In both cases the corrections used were updates of the original corrections published in the papers. The following pages give more information about bias corrections for profile data: http://www.nodc.noaa.gov/OC5/XBT_BIAS/xbt_bias.html and http://www.nodc.noaa.gov/OC5/mbt-bias/. Please get in touch if you would like to use data without bias corrections applied or if you would like data with different corrections.
Warning:
an error has been discovered with the temperature_uncertainty field in the objective analyses - please subtract 273.15 from all non-mising values for this field before using. This will be fixed for the next version of EN4.
(this is also the case for EN4.0.2 data downloaded on taurus.geomar.de:/data/c2/misc/EN4/)