Comparison of GOME-2 UVA Satellite Data to Ground-Based UVA Measurements in South Africa

du Preez, D. Jean and Parisi, Alfio V. and Millar, Danielle A. and Bencherif, Hassan and Wright, Caradee Y. (2020) Comparison of GOME-2 UVA Satellite Data to Ground-Based UVA Measurements in South Africa. Photochemistry and Photobiology, 96 (6). pp. 1342-1349. ISSN 0031-8655


Satellite estimates of surface ultraviolet A (UVA) (315-400 nm) from the Global Ozone Monitoring Experiment (GOME)-2 were compared to ground-based measurements at four stations in South Africa over a four-year period (2015-2018). The comparison of daily exposure and daily maximum irradiance was completed for all-sky and clear-sky conditions. There is a strong linear correlation between the satellite and ground-based data with a correlation coefficient (r) between 0.85 and 0.96 for all sky conditions. However, at three of the stations the satellite data is under-estimated compared to ground-based data with a mean bias error (MBE) between -7.3% and -12.0%. Factors such as aerosols, surface albedo, altitude and data resolution may contribute to the under-estimations found at the three sites. These results indicate that satellite estimates of surface UVA over South Africa do not exhibit the same behaviour as other stations around the world and therefore require further validation.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
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: 01 Dec 2020 23:27
Last Modified: 03 Jan 2021 22:25
Uncontrolled Keywords: UVA, GOME-2, satellite, South Africa
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
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