The inter-comparison of measurements between laboratories, who work on the accuracy of Copernicus Sentinel Ocean Colour and Sea Surface Temperature products, are an important component of quality checks of data collected in the field. Last year on the AMT4SentinelFRM research voyage, Plymouth Marine Laboratory (PML) carried out an inter-comparison exercise in collaboration with the EU Joint Research Centre, Italy, on optical data collected from the ship that is used for the validation of satellite ocean colour products.
On this year’s AMT4SentinelFRM research voyage, under the research project Fiducial Reference Measurements for Sentinel Ocean Colour (FRM4SOC), a further inter-comparison exercise is being carried out with The Royal Belgian Institute of Natural Sciences (RBINS) and Tartu Observatory (TO), Estonia, comparing long track and on station above water radiometric measurements using different optical sensors. Gavin Tilstone and Francesco Nencioli from PML have been joined by Quinten Van Hellemont from RBINS and Krista Alikas from TO on RRS Discovery to make these measurements.
Left: a purpose-built stainless steel frame used to position all the optical sensors at the same viewing geometry. Right: the sensors have an unimpeded view of the surface of the ocean and look at the same patch of water. (PML)