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

Tilstone, GH, Jordan, TM, Aurin, D, Białek, A, Deru, A, Ramsay, A, Hieronymi, M, Dall’Olmo, G, Ligi, M, Kovach, C, Ansko, I, Ondrusek, M, Vabson, V, Zibordi, G, Gossn, JI, Kwiatkowska, E and Vendt, R 2025 Radiometric field inter-comparison of fiducial reference measurements using an open source community processor. Optics Express, 33 (7). 15756. 10.1364/OE.551042

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Abstract/Summary

A radiometric field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in the Adriatic Sea from 14 to 21 July 2022 to assess differences in the accuracy of above-water radiometer systems (Sea-Bird HyperSAS, pySAS, TriOS-RAMSES) processed using an open-source community processor (HyperCP). Class-based and sensor-specific characteristics of the radiometers were used to determine the quantities E d ( λ ), L sky ( λ ), L t ( λ ) and R rs ( λ ), and their associated uncertainties. Using sensor-specific characteristics, the differences among systems were 2% for E d ( λ ), L sky ( λ ), L t ( λ ) and 2.5% for R rs ( λ ) and the uncertainties were 1.5%, 2%, 1.5% and 5%, respectively. The differences were higher when using class-based characteristics. L wn ( λ ) values were also compared to the above-water AERONET-OC SeaPRiSM and in-water HyperPro II. For SeaPRiSM, the differences and uncertainties were <5% over blue and green bands when using Mobley [ App. Opt. 38 , 7442 ( 1999 ) 10.1364/AO.38.007442 ] sea surface reflectance factors (ρ) and no NIR correction. For HyperPro II the differences were larger but were reduced when R rs ( λ ) from the above-water systems was computed using ρ from Zhang et al. [ Opt. Express 25 , A1 ( 2017 ) 10.1364/OE.25.0000A1 ] with similarity (sim) spectrum (spec) NIR correction. HyperCP using sensor-specific characteristics is highly recommended to reduce the associated uncertainties and to produce the highest quality data for satellite OC validation.

Item Type:	Publication - Article
Divisions:	Plymouth Marine Laboratory > National Capability categories > Atlantic Meridional Transect
Depositing User:	S Hawkins
Date made live:	12 May 2025 08:48
Last Modified:	12 May 2025 08:48
URI:	https://plymsea.ac.uk/id/eprint/10399

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