Oral Session 3

Radiometric field inter-comparison of fiducial reference measurements using an open source community processor

A radiometric field intercomparison was conducted at the Acqua Alta Oceanographic Tower in the northern Adriatic Sea from 11 to 21 July 2022, to assess differences in the accuracy of in- and above-water radiometer systems. Absolute radiometric calibration of all sensors was conducted using the same standards and methods at a dedicated laboratory. Measurements from five above-water systems; (Sea-Bird HyperSAS and pySAS, 2 TriOS-RAMSES, SeaPRiSM), one in-water Sea-Bird HyperPro II and a floating RAMSES system were made under clear sky conditions, high sun altitude and moderately low sea state. Data from the above-water Sea-Bird and TriOS systems were processed using the open-source community processor (HyperCP) with standardized settings. The output was compared to the mean of the Sea-Bird and TriOS above-water systems and to SeaPRiSM, HyperPro II and to the floating RAMSES system as an independent reference. For HyperCP class-based processing, there was generally a 1% difference to the mean for Ed(λ), Lsky(λ), Lt(λ), and 5% for Rrs(λ) and the uncertainties were ~4.5%, 3%, 3% and <7%, respectively. For the HyperCP sensor-specific processing the differences in Ed(λ), Lsky(λ), Lt(λ) were 2% and 2.5% for Rrs(λ). The sensor-specific uncertainties were lower than the class-based and were 1.5%, 2%, 1.5% and 5%, respectively. For class-based versus sensor-specific processing of Ed(λ), Lsky(λ), Lt(λ), and Rrs(λ) the differences were typically <5%. Processing data with the HyperCP using sensor-specific characteristics is highly recommended to reduce the associated uncertainties, ensure processing to standard community practice consensus, and to produce the highest quality data.

Gavin Tilstone, Plymouth Marine Laboratory, United Kingdom, https://orcid.org/0000-0002-9347-1682

Thomas Jordan, Plymouth Marine Laboratory, United Kingdom

Ashley Ramsay, National Physical Laboratory, United Kingdom

Dirk Aurin, NASA, USA

Agnieszka Bialek, National Physics Laboratory, United Kingdom

Alexis Deru, ACRI-ST, France

Martin Hieronymi, HEREON, Germany

Giorgio Dall’Olmo, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Italy

Martin Ligi, University of Tartu, Estonia

Charles Kovach, NOAA, USA

Michael Ondrusek, NOAA, USA

Viktor Vabson, University of Tartu, Estonia

Ilmar Ansko, University of Tartu, Estonia

Riho Vendt, University of Tartu, Estonia

Giuseppe Zibordi, NASA Goddard Space Flight Center, USA,

Juan Ignacio Gossn, EUMETSAT, Germany

Ewa Kwiatkowska, EUMETSAT, Germany

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