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The Langley Ratio method, a new approach for transferring photometer calibration from direct sun measurements [Discussion paper]
Title: The Langley Ratio method, a new approach for transferring photometer calibration from direct sun measurements [Discussion paper]
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, ÓscarCarreño Corbella, VirgilioAutor AEMETCachorro, Victoria E.Cuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMET
Keywords: Solar photometry; Aerosol properties; Radiometer
Issue Date: 2023
Publisher: European Geosciences Union; Copernicus Publications
Citation: Atmospheric Measurement Techniques Discussions [Preprint]. 2023
Publisher version:
Abstract: This article presents a new method for transferring calibration from a reference photometer, referred to as the "master'', to a secondary 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 PFR, (Precision Filter Radiometer) 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, the standard photometer used by AERONET (AErosol RObotic NETwork). These two photometers have different optics, sun-tracking systems and spectral bands. The Langley Ratio method (LR) proposed in this study was used to transfer calibration to the closest spectral bands for 1-minute synchronous data, for airmasses between 2 and 5, and 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 six-month period under different aerosol regimes. In terms of calibration aspects, our results showed very low relative differences and standard deviations in the calibration constant transferred in Izaña from PFR to Cimel, up to 0.29 % and 0.46 %, respectively, once external factors such as different field-of-view between photometers or the presence of calibration issues were considered. However, these differences were higher in the comparison performed at Valladolid (1.04 %) and in the shorter wavelengths spectral bands (up to 0.78 % in Izaña and 1.61 % in Valladolid).
ISSN: 1867-1381
Appears in Collections:Artículos científicos 2023-2026

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