The aim of the Gap Analysis for Integrated Atmospheric ECV CLImate Monitoring (GAIA-CLIM) project ( is to improve our ability to use ground-based and sub-orbital (aka non-satellite) observations to characterise satellite observations for a number of atmospheric Essential Climate variables (ECVs). The key outcomes will be a “Virtual Observatory” facility of co-locations and their uncertainties and a report on gaps in capabilities or understanding, which shall be used to inform subsequent Horizon 2020 activities.

BK Scientific is leading Work Package 2  – Measurement uncertainty quantification

WP2 is concerned with improving our metrological characterisation of measurements of GAIA-CLIM target ECVs. To enable a comprehensive comparison between a satellite and non-satellite measurement requires a full metrological characterisation of at least one of the two measurements (reference-quality data). A full characterisation requires an unbroken chain of measurement processing to SI or accepted standards and a quantification of the uncertainty in each step. The workpackage shall:

  • Create, to the extent possible, fully traceable reference-quality measurements for a number of measurement techniques that are close to such maturity (Task 2.1).
  • Analyse existing comparisons and observations to provide more indicative uncertainties for observations from the remainder of the global observing system capabilities (Task 2.2).
  • Undertake metrological auditing and produce best practices documentation for improving instrument characterisation (Task 2.3).



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