Atmospheric total ozone column evaluation with a smartphone image sensor

Igoe, Damien P., Parisi, Alfio V., Amar, Abdurazaq, Downs, Nathan J., and Turner, Joanna (2018) Atmospheric total ozone column evaluation with a smartphone image sensor. International Journal of Remote Sensing, 39 (9). pp. 2766-2783.

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Abstract

A new method for quantifying the total ozone column (TOC) using a smartphone image sensor has been developed and validated. The TOC has been evaluated for relatively cloud free days at high air masses for solar zenith angles between 49.7 degrees and 76.7 degrees at a sub-tropical site. The method is based on the evaluation of the direct solar irradiances at 305 and 312nm using the red colour pixel values of the solar disc recorded at these wavelengths by a smartphone camera. Narrow bandpass filters of 2nm full width at half maximum at each of the two wavelengths were used in turn placed over the camera sensor to directly image the solar disc. The calibration of the pixel values of the solar disc to provide the direct solar irradiances at each of these two wavelengths allowed evaluation of the TOC calibrated to a portable sun photometer. The root mean square error (RMSE) for the smartphone-derived ozone values calibrated to corresponding values from a portable sun photometer was 4.3 Dobson Units (DU). The validation measurements for the smartphone-derived ozone values provided an average residual of 3.5% (up to a maximum of 11%) compared to the corresponding portable sun photometer values, with an RMSE of 8.4 DU during days of intermittent inclement weather conditions. The evaluation of the TOC based on a widely available device such as a smartphone has the potential to increase current citizen science initiatives valued by the general public and school-aged learners by enhancing knowledge and awareness of ozone and the resulting influences on the solar ultraviolet environment.

Item ID: 53467
Item Type: Article (Research - C1)
ISSN: 1366-5901
Keywords: ozone, ozone layer, solar radiation, smartphone image sensor, remote sensing, environmental modelling
Copyright Information: © 2018 Informa UK Limited, trading as Taylor & Francis Group.
Date Deposited: 07 Mar 2018 07:40
FoR Codes: 04 EARTH SCIENCES > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920405 Environmental Health @ 50%
89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890104 Mobile Telephone Networks and Services @ 50%
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