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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-423
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
26 Jan 2017
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Assessment of nocturnal Aerosol Optical Depth from lunar photometry at Izaña high mountain Observatory
África Barreto1,2,5, Roberto Román3,4, Emilio Cuevas1, Alberto J. Berjón5, A. Fernando Almansa1,2,5, Carlos Toledano5, Ramiro González5, Yballa Hernández1, Luc Blarel6, Philippe Goloub6, and Margarita Yela7 1Izaña Atmospheric Research Center, Meteorological State Agency of Spain (AEMET), Spain
2Cimel Electronique, Paris, France
3Department of Applied Physics, University of Granada, Granada, Spain
4Andalusian Institute for Earth System Research, IISTA-CEAMA, University of Granada, Junta de Andalucía, Granada, Spain
5Grupo de Óptica Atmosférica, Universidad de Valladolid, Valladolid, Spain
6Laboratoire d’Optique Atmosphérique (LOA), Université de Lille, Villeneuve d'Ascq, France
7Instrumentation and Atmospheric Research Department, National Institute for Aerospace Technology (INTA), Madrid, Spain
Abstract. This work is a first approach to correct the systematic errors observed in the aerosol optical depth (AOD) retrieved at night-time using lunar photometry and calibration techniques dependent on the lunar irradiance model. To this end, nocturnal AOD measurements were performed in 2014 using the CE318-T master Sun-sky-lunar photometer (Lunar-Langley calibrated) at Izaña high mountain Observatory. This information has been restricted to 59 nights characterized as clean and stable according to lidar vertical profiles. A phase angle dependence as well as an asymmetry within the Moon's cycle of the ROLO model could be deduced from the comparison in this 59-nights period of the CE318-T calibration performed by means of the Lunar-Langley and the calibration performed every single night by means of the common Langley technique. Nocturnal AOD has also been compared in the same period with a reference AOD based on daylight AOD extracted from the AERONET network at the same station. Considering stable conditions, the difference ΔAODfit, between AOD from lunar observations and the linearly interpolated AOD (the reference) from daylight data, has been calculated. The results show that ΔAODfit values are strongly affected by Moon phase and zenith angles. This dependency has been parameterized using an empirical model with two independent variables (Moon phase and zenith angles) in order to correct the AOD for these residual dependencies. The correction of this parameterized dependency has been checked at four stations with quite different environmental conditions (Izaña, Lille, Carpentras and Dakar) showing a significant reduction of the AOD dependence on phase and zenith angles, and an improved agreement with daylight reference data. After the correction, absolute AOD differences for day-night-day clean and stable transitions remain below 0.01 for all wavelengths.

Citation: Barreto, Á., Román, R., Cuevas, E., Berjón, A. J., Almansa, A. F., Toledano, C., González, R., Hernández, Y., Blarel, L., Goloub, P., and Yela, M.: Assessment of nocturnal Aerosol Optical Depth from lunar photometry at Izaña high mountain Observatory, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-423, in review, 2017.
África Barreto et al.
África Barreto et al.
África Barreto et al.

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Short summary
This work involves a first analysis of the systematic errors observed in the AOD retrieved at night-time using the Sun-sky-lunar CE318-T photometer. In this respect, this paper is a first attempt to correct the AOD uncertainties that currently affect the lunar photometry by means of an empirical regression model. We have detected and corrected an important bias correlated to Moon's phase and zenith angles, especially at longer wavelength channels.
This work involves a first analysis of the systematic errors observed in the AOD retrieved at...
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