Premium
Evaluated UVA Irradiances over a Twelve‐year Period at a Subtropical Site from Ozone Monitoring Instrument Data Including the Influence of Cloud
Author(s) -
A Jebar Mustapha A.,
Parisi Alfio V.,
Downs Nathan J.,
Turner Joanna F.
Publication year - 2018
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12948
Subject(s) - ozone monitoring instrument , noon , environmental science , radiometer , cloud cover , cloud fraction , satellite , atmospheric sciences , irradiance , microwave radiometer , meteorology , remote sensing , cloud top , cloud computing , physics , ozone , geography , astronomy , optics , computer science , operating system
This research investigated the influence of cloud on the broadband UVA solar noon irradiances evaluated from the solar noon satellite‐based OMI spectral UV data that were compared to the irradiances of a ground‐based radiometer from 1 October 2004 to 31 December 2016. The correlation between ground‐based radiometer data and the evaluated OMI broadband UVA data evaluated with a model were dependent on whether or not the solar disk was obscured by the presence of cloud and the total sky cloud fraction. For conditions when the sun was not obscured by cloud, the evaluated satellite and the ground‐based UVA irradiance correlation was best for cloud cover between 0 and 2 octa ( R 2 = 0.77) and the worst for high cloud cover of >4–8 octa ( R 2 between 0.3 and 0.4). The R 2 reduced with increasing cloud amount and showed significantly weaker correlation when the sun was obscured. The correlation between the evaluated satellite broadband UVA and the ground‐based measurements over the twelve years for total cloud cover conditions of 4 or less octa confirmed that the broadband UVA satellite evaluation model for the OMI spectral data is valid for approximately 71% of the days at the Southern Hemisphere subtropical study site.