Evaluation of on-site calibration procedures for SKYNET Prede POM sun–sky photometers

Author:

Campanelli MonicaORCID,Estellés VictorORCID,Kumar GauravORCID,Nakajima Teruyuki,Momoi MasahiroORCID,Gröbner JulianORCID,Kazadzis SteliosORCID,Kouremeti Natalia,Karanikolas AngelosORCID,Barreto Africa,Nevas Saulius,Schwind Kerstin,Schneider Philipp,Harju Iiro,Kärhä Petri,Diémoz HenriORCID,Kudo Rei,Uchiyama Akihiro,Yamazaki Akihiro,Iannarelli Anna Maria,Mevi Gabriele,Di Bernardino AnnalisaORCID,Casadio StefanoORCID

Abstract

Abstract. To retrieve columnar intensive aerosol properties from sun–sky photometers, both irradiance and radiance calibration factors are needed. For the irradiance the solar calibration constant, V0, which denotes the instrument counts for a direct normal solar flux extrapolated to the top of the atmosphere, must be determined. The solid view angle, SVA, is a measure of the field of view of the instrument, and it is important for obtaining the radiance from sky diffuse irradiance measurements. Each of the three sun-photometer networks considered in the present study (SKYNET, AERONET, WMO GAW) adopts different protocols of calibration, and we evaluate the performance of the on-site calibration procedures, applicable to every kind of sun–sky photometer but tested in this analysis only on SKYNET Prede POM01 instruments, during intercomparison campaigns and laboratory calibrations held in the framework of the Metrology for Aerosol Optical Properties (MAPP) European Metrology Programme for Innovation and Research (EMPIR) project. The on-site calibration, performed as frequently as possible (ideally monthly) to monitor changes in the device conditions, allows operators to track and evaluate the calibration status on a continuous basis, considerably reducing the data gaps incurred by the periodic shipments for performing centralized calibrations. The performance of the on-site calibration procedures for V0 was very good at sites with low turbidity, showing agreement with a reference calibration between 0.5 % and 1.5 % depending on wavelengths. In the urban area, the agreement decreases between 1.7 % and 2.5 %. For the SVA the difference varied from a minimum of 0.03 % to a maximum of 3.46 %.

Funder

European Cooperation in Science and Technology

Publisher

Copernicus GmbH

Reference34 articles.

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