Hadley Centre subsurface temperature and salinity objective analyses (version 4.2.0)

Quality controlled subsurface temperature and salinity reanalysis of observations

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

Profiles and analyses with two different sets of bias corrections applied are available: 1) Gouretski and Reseghetti (2010) corrections [g10] and 2) Levitus et al (2009) corrections [l09]. 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 in the analysis fields in the Labrador Sea between January 1988 and December 1990 causing the sea water potential temperature field to be much too warm. This appears to primarily affect the analysis depth levels of 373m and 447m. We are aware of the issue and are working on identifying the cause. If you are in need of Labrador Sea data in the meantime the EN.4.1.1 analysis fields are still available here:http://www.metoffice.gov.uk/hadobs/en4/download-en4-1-1.html.

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.

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 at http://www.metoffice.gov.uk/hadobs/en4/contact.html. 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.

Citing the data
When using the data set in a paper, please quote the version number (for example EN4.2.0), 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.

References

Viktor Gouretski and Franco 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, 6. doi: http://dx.doi.org/10.1016/j.dsr.2010.03.011

S. Levitus et al., 2009: Global ocean heat content 1955-2008 in light of recently revealed instrumentation problems. Geophysical Research Letters, 36, L07608. doi:http://dx.doi.org/10.1029/2008GL037155

Variables
temperature, salinity, temperature_uncertainty, salinity_uncertainty, temperature_observation_weights, salinity_observation_weights
Zonal Global by 1 deg
Meridional Global by 1 deg
Vertical 5.02159, 15.07854, 25.16046, 35.27829, 45.44776, 55.69149, 66.04198, 76.54591, 87.27029, 98.31118, 109.8062, 121.9519, 135.0285, 149.4337, 165.7285, 184.6975, 207.4254, 235.3862, 270.5341, 315.3741, 372.9655, 446.8009, 540.5022, 657.3229, 799.5496, 967.9958, 1161.806, 1378.661, 1615.291, 1868.071, 2133.517, 2408.583, 2690.78, 2978.166, 3269.278, 3563.041, 3858.676, 4155.628, 4453.502, 4752.021, 5050.99, 5350.272  
Temporal Jan 1900 to Sep 2017 by 1 month(s)
Static? no
Volume 60 MB per month
Server public:
Source http://www.metoffice.gov.uk/hadobs/en4/index.html
Acquired May 17, 2017 (Updated Jun 2018)
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