Influence of Clouds on OMI Satellite Total Daily UVA Exposure over a 12-year Period at a Southern Hemisphere Site

A Jebar, Mustapha A. and Parisi, Alfio V. and Downs, Nathan J. ORCID: and Turner, Joanna (2020) Influence of Clouds on OMI Satellite Total Daily UVA Exposure over a 12-year Period at a Southern Hemisphere Site. International Journal of Remote Sensing, 41 (1). pp. 272-283. ISSN 0143-1161


This research investigated and evaluated the influence of clouds on the total daily UVA (320-400 nm) exposures calculated from the three Ozone Monitoring Instrument (OMI) UV spectral irradiances at solar noon. These evaluated satellite total daily UVA exposure data were compared to the total daily UVA exposures of a ground-based instrument over the period of October 2004 to December 2014 at a sub-tropical Australian site (27.5oS, 151.9oE) under all cloud cover conditions including sun obscured and not obscured conditions. The aim was to evaluate the influence of clouds on the total daily UVA. When the sun was not obscured by clouds, there was good agreement between satellite and ground-based daily UVA exposure measurements with coefficient of determination (R2) between 0.80 and 0.84, for the cloud conditions 0 to 2, > 2 to 4, > 4 to 6 and > 6 to 8 oktas. For sun obscured by clouds, the R2 was 0.71, 0.64 and 0.75 respectively for > 2 to 4, > 4 to 6 and > 6 to 8 oktas. The method was validated using total daily UVA exposures from ground measurements taken in 2015 and 2016 giving a mean absolute error of 84.2 kJ m-2 (10%) and 138.8 kJ m-2 (30%) respectively, for the cases of sun not obscured cloudy days and sun obscured by cloud cover. Total daily UVA exposures were able to be calculated from the OMI satellite spectral irradiance for all cloud conditions, including cases were the sun was obscured, demonstrating the potential application of the technique to be applied in locations that do not record surface UVA measurements directly.

Statistics for USQ ePrint 37241
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Sciences (6 Sep 2019 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Date Deposited: 20 Jan 2020 01:34
Last Modified: 29 Mar 2021 05:37
Uncontrolled Keywords: OMI, clouds, UVA, skin cancer
Fields of Research (2008): 02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5199 Other physical sciences > 519999 Other physical sciences not elsewhere classified
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI:

Actions (login required)

View Item Archive Repository Staff Only