This workpackage is concerned with improving our metrological characterisation of measurements of GAIA-CLIM target Essential Climate Variables (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).


Figure: Example metrological characterisation of a radiosonde profile from Dirksen et al., 2014.

First traceability model diagrams can be found here.

Product Traceability and Uncertainty (PTU) documents can be found here.