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The Langley ratio method, a new approach for transferring photometer calibration from direct sun measurements
Title: The Langley ratio method, a new approach for transferring photometer calibration from direct sun measurements
Authors: Almansa Rodríguez, Antonio FernandoAutor AEMETBarreto Velasco, África ORCID RESEARCHERID SCOPUSID Autor AEMETKouremeti, NataliaGonzález, RamiroMasoom, AkritiToledano, CarlosGröbner, JulianGarcía Cabrera, Rosa Delia ORCID RESEARCHERID González Ramos, Yenny ORCID Autor AEMETKazadzis, SteliosVictori, StéphaneÁlvarez, ÓscarMaupin, FabriceCarreño Corbella, VirgilioAutor AEMETCachorro, Victoria E.Cuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMET
Keywords: Solar photometry; Aerosol properties; Radiometer
Issue Date: 2024
Publisher: European Geosciences Union; Copernicus Publications
Citation: Atmospheric Measurement Techniques. 2024, 17(2), 659–675
Publisher version:
Abstract: This article presents a new method for transferring calibration from a reference sun photometer, referred to as the “master”, to a secondary sun photometer, referred to as the “field”, using a synergetic approach when master and field instruments have different spectral bands. The method was first applied between a precision filter radiometer (denoted PFR) instrument from the World Optical Depth Research and Calibration Center (WORCC), considered the reference by the WMO (World Meteorological Organization), and a CE318-TS photometer (denoted Cimel), the standard photometer used by AERONET (AErosol RObotic NETwork). These two photometers have different optics, sun-tracking systems, and spectral bands. The Langley ratio (LR) method proposed in this study was used to transfer calibration to the closest spectral bands for 1 min synchronous data for air masses between 2 and 5, and it was compared to the state-of-the-art Langley calibration technique. The study was conducted at two different locations, Izaña Observatory (IZO) and Valladolid, where measurements were collected almost simultaneously over a 6-month period under different aerosol regimes.
Sponsorship : Additional funding comes from the European Commission Research Infrastructure Action under the ACTRIS grant (grant no. 871115) and the Ministerio de Economía y Competitividad of Spain through the project SYNERA (grant no. PID2020-521-118793GA-I00).
ISSN: 1867-1381
Appears in Collections:Artículos científicos 2023-2026

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