Sensitivity of UV Erythemal Radiation to Total Ozone Changes under Different Sky Conditions: Results for Granada, Spain Antón, Manuel Cazorla Cabrera, Alberto Mateos, D. Costa, M. J. Olmo Reyes, Francisco José Alados Arboledas, Lucas Ozone Sky camera Granada Ultraviolet radiation This is the peer reviewed version of the following article: Antón, M.; et al. Sensitivity of UV Erythemal Radiation to Total Ozone Changes under Different Sky Conditions: Results for Granada, Spain. Photochemistry and Photobiology, 92(1): 215-219 (2016), which has been published in final form at http://dx.doi.org/10.1111/php.12539 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving This paper focuses on the analysis of the sensitivity of UV erythemal radiation (UVER) to variations of the total ozone column (TOC) under different sky conditions at Granada (southeastern Spain). The sensitivity is studied both in relative terms by means of the Radiation Amplification Factor (RAF) and in absolute terms using the Ozone Efficiency (OE). These two variables are determined for diverse sky conditions characterized by the cloud cover information given by a sky camera (in oktas) and the cloud optical depth (COD) estimated from global solar radiation measurements. As expected, in absolute terms, the TOC variations cause substantially smaller UVER changes during completely overcast situations than during cloud-free cases. For instance, the OE (SZA=30º, TOC=290 DU) decreases from 0.68 mW/m2 per unit of TOC (0 oktas) to 0.50 mW/m2 per unit of TOC (8 oktas). However, the opposite is observed when the analysis is performed in relative terms. Thus, the RAF (determined for SZA cases below 80º) increases from 1.1 for cloud-free cases (0 oktas) to 1.4 for completely overcast situations (8 oktas). This opposite behavior is also found when both RAF and OE are analyzed as functions of COD. Thus, while the OE strongly decreases with increasing COD, the RAF increases as COD increases. 2017-12-15T13:53:56Z 2017-12-15T13:53:56Z 2016-02 journal article Antón, M.; et al. Sensitivity of UV Erythemal Radiation to Total Ozone Changes under Different Sky Conditions: Results for Granada, Spain. Photochemistry and Photobiology, 92(1): 215-219 (2016). [http://hdl.handle.net/10481/48574] 1751-1097 http://hdl.handle.net/10481/48574 10.1111/php.12539 eng info:eu-repo/grantAgreement/EC/H2020/654109 http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Wiley