The goal of MetEOC is to create metrology tools and frameworks needed to underpin a global climate observing system.

An objective is to develop instrumentation and standards for traceable climate quality measurements, including temperature of the Mesopause and thermal infrared sky radiance, from surface-based networks such as those operated under the WMO and UN, e.g. NDMC.

The artefact-based WRR (World Radiometric Reference) is close to replacement by an SI standard, CSAR, having participated in two WMO comparisons. However, for full acceptance, further work to operationalise and remove associated uncertainty in the measurement of window transmittance and diffraction is required. Other scales e.g. WISG (World Infrared Standard Group) received attention in MetEOC-3, with a design of a calibration source. This source needs full characterisation before calibrating the WISG radiometers. This project will make possible spectral and spatially resolved measurements of infrared sky radiance resulting in information to understand observed discrepancies between different pyrgeometer types and unexplained dependence with atmospheric opacity. A new pyrgeometer taking account of these effects will be designed and built.

MetEOC-4 will help extending traceability and performance to the full NDMC (Network for the Detection of Mesopause Change). This will be combined with a complementary space measurement of the mesopause using a next-generation spectrometer to close the metrological circle, on-board a CubeSat, to be fully calibrated in this project.

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