International Quality-Controlled Ocean Database (IQuOD) v0.1: The Temperature Uncertainty Specification

Rebecca Cowley, Rachel E. Killick, Tim Boyer, Viktor Gouretski, Franco Reseghetti, Shoichi Kizu, Matthew D. Palmer, Lijing Cheng, Andrea Storto, Marc Le Menn, Simona Simoncelli, Alison M. Macdonald, Catia M. Domingues

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Ocean temperature observations are crucial for a host of climate research and forecasting activities, such as climate monitoring, ocean reanalysis and state estimation, seasonal-to-decadal forecasts, and ocean forecasting. For all of these applications, it is crucial to understand the uncertainty attached to each of the observations, accounting for changes in instrument technology and observing practices over time. Here, we describe the rationale behind the uncertainty specification provided for all in situ ocean temperature observations in the International Quality-controlled Ocean Database (IQuOD) v0.1, a value-added data product served alongside the World Ocean Database (WOD). We collected information from manufacturer specifications and other publications, providing the end user with uncertainty estimates based mainly on instrument type, along with extant auxiliary information such as calibration and collection method. The provision of a consistent set of observation uncertainties will provide a more complete understanding of historical ocean observations used to examine the changing environment. Moving forward, IQuOD will continue to work with the ocean observation, data assimilation and ocean climate communities to further refine uncertainty quantification. We encourage submissions of metadata and information about historical practices to the IQuOD project and WOD.

Original languageEnglish
Article number689695
JournalFrontiers in Marine Science
Publication statusPublished - 2021 Jun 11


  • XBT
  • accuracy
  • bias correction
  • ocean climate
  • ocean data assimilation
  • ocean temperature profiles
  • uncertainty

ASJC Scopus subject areas

  • Oceanography
  • Global and Planetary Change
  • Aquatic Science
  • Water Science and Technology
  • Environmental Science (miscellaneous)
  • Ocean Engineering


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