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| Tilstone, Gavin; Dall’olmo, Giorgio; Hieronymi, Martin; Ruddick, Kevin; Beck, Matthew; Ligi, Martin; Costa, Maycira; D’alimonte, Davide; Vellucci, Vincenzo; Vansteenwegen, Dieter; Bracher, Astrid; Wiegmann, Sonja; Kuusk, Joel; Vabson, Viktor; Ansko, Ilmar; Vendt, Riho; Donlon, Craig; Casal, Tânia. |
| A field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in the northern Adriatic Sea, from 9 to 19 July 2018 to assess differences in the accuracy of in- and above-water radiometer measurements used for the validation of ocean colour products. Ten measurement systems were compared. Prior to the intercomparison, the absolute radiometric calibration of all sensors was carried out using the same standards and methods at the same reference laboratory. Measurements were performed under clear sky conditions, relatively low sun zenith angles, moderately low sea state and on the same deployment platform and frame (except in-water systems). The weighted average of five above-water measurements was used as baseline reference for... |
| Tipo: Text |
Palavras-chave: Fiducial reference measurements; Remote sensing reflectance; Ocean colour radiometers; TriOS RAMSES; Seabird HyperSAS; Field intercomparison; AERONET-OC; Acqua Alta Oceanographic Tower. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74135/73599.pdf |
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| Białek, Agnieszka; Goodman, Teresa; Woolliams, Emma; Brachmann, Johannes F. S.; Schwarzmaier, Thomas; Kuusk, Joel; Ansko, Ilmar; Vabson, Viktor; Lau, Ian C.; Maclellan, Christopher; Marty, Sabine; Ondrusek, Michael; Servantes, William; Taylor, Sarah; Van Dommelen, Ronnie; Barnard, Andrew; Vellucci, Vincenzo; Banks, Andrew C.; Fox, Nigel; Vendt, Riho; Donlon, Craig; Casal, Tânia. |
| We present the results from Verification of Reference Irradiance and Radiance Sources Laboratory Calibration Experiment Campaign. Ten international laboratories took part in the measurements. The spectral irradiance comparison included the measurements of the 1000 W tungsten halogen filament lamps in the spectral range of 350 nm–900 nm in the pilot laboratory. The radiance comparison took a form of round robin where each participant in turn received two transfer radiometers and did the radiance calibration in their own laboratory. The transfer radiometers have seven spectral bands covering the wavelength range from 400 nm–700 nm. The irradiance comparison results showed an agreement between all lamps within ±1.5%. The radiance comparison results presented... |
| Tipo: Text |
Palavras-chave: Ocean colour; Spectral irradiance comparison; Spectral radiance sources comparison; Fiducial reference measurements. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00655/76688/77827.pdf |
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