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The new sun-sky-lunar Cimel CE318-T multiband photometer-a comprehensive performance evaluation
Title: The new sun-sky-lunar Cimel CE318-T multiband photometer-a comprehensive performance evaluation
Authors: Barreto Velasco, África ORCID RESEARCHERID SCOPUSID Autor AEMETCuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMETGranados-Muñoz, María JoséAlados Arboledas, LucasRomero Campos, Pedro Miguel ORCID RESEARCHERID Autor AEMETGröbner, JulianKouremeti, NataliaAlmansa Rodríguez, Antonio FernandoAutor AEMETStone, TomToledano, CarlosRomán, RobertoSorokin, MikhailHolben, Brent N.Canini, MariusYela González, Margarita
Keywords: Photometer CE318-T; Fotómetros multibanda; Vapor de agua; Aerosoles
Issue Date: 2016
Publisher: European Geosciences Union
Citation: Atmospheric Measurement Techniques. 2010, 9(2), p. 631-654
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Abstract: This paper presents the new photometer CE318-T, able to perform daytime and night-time photometric measurements using the sun and the moon as light source. Therefore, this new device permits a complete cycle of diurnal aerosol and water vapour measurements valuable to enhance atmospheric monitoring to be extracted. In this study we have found significantly higher precision of triplets when comparing the CE318-T master instrument and the Cimel AErosol RObotic NETwork (AERONET) master (CE318-AERONET) triplets as a result of the new CE318-T tracking system. Regarding the instrument calibration, two new methodologies to transfer the calibration from a reference instrument using only daytime measurements (Sun Ratio and Sun-Moon gain factor techniques) are presented and discussed. These methods allow the reduction of the previous complexities inherent to nocturnal calibration. A quantitative estimation of CE318-T AOD uncertainty by means of error propagation theory during daytime revealed AOD uncertainties (uDAOD) for Langley-calibrated instruments similar to the expected values for other reference instruments (0.002–0.009). We have also found uDAOD values similar to the values reported in sun photometry for field instruments ( 0.015). In the case of the night-time period, the CE318-T-estimated standard combined uncertainty (uNAOD) is dependent not only on the calibration technique but also on illumination conditions and the instrumental noise. These values range from 0.011–0.018 for Lunar Langley-calibrated instruments to 0.012–0.021 for instruments calibrated using the Sun Ratio technique. In the case of moon-calibrated instruments using the Sun-Moon gain factor method and suncalibrated using the Langley technique, we found uNAOD ranging from 0.016 to 0.017 (up to 0.019 in 440 nm channel), not dependent on any lunar irradiance model.
Sponsorship : The AERONET sun photometers at Izaña have been calibrated within the AERONETEurope TNA, supported by the European Community-Research Infrastructure Action under the FP7 ACTRIS grant agreement no. 262254. This work has also been supported by the Andalusia regional government through projects P12-RNM-2409 and P10-RNM-6299, by the Spanish Ministry of Science and Technology through project CGL2013-45410-R; and finally by the EU through ACTRIS project (EU INFRA-2010-1.1.16-262254).
ISSN: 1867-1381
Appears in Collections:Artículos científicos 2015-2018

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