Quantifying the effects of a low-ozone event and shallow stratocumulus clouds on ultraviolet erythemal radiation exposure
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Meteorological and dosimetric ultraviolet (UV) erythemal radiation (UVER) measurements were performed in Didcot, England, on 6 and 7 April 2017. Both days were characterized by clear-sky conditions in the morning and the afternoon with development of shallow stratocumulus clouds (SSC) around noon. In addition, a low-ozone event occurred on 7 April characterized by a 34 DU (Dobson Unit) drop in total stratospheric ozone content. Compared to 6 April, the ozone mini-hole caused UVER increases of 2.67 standard erythema dose (SED) for diffuse and 4.32 SED for global radiation characterized by radiation amplification factors (RAF) of 1.62 and 1.52, respectively. The total global UVER dose reductions due to SSC coverage amount to 2.33 SED (6 April) and 2.81 SED (7 April). As innovation the RAF is decomposed into two parts, named cloud ozone factor (COF) and radiation amplification factor based on measured data (RAFm), to quantify the low-ozone event’s effect and the SSC influence in independently modifying the UVER doses. Hereby, the weight of each of these two effects acting during the same low-ozone event is expressed by the new COF. In this case, the COF values range between −0.13 and −0.11 for diffuse UVER and −0.03 to −0.07 for the global UV and UV-B parts. A positive COF value (0.18) results for the global UV-A range.
KeywordsLow-ozone event Shallow stratocumulus clouds UV erythemal radiation GENESIS-UV
The measured and derived data sets are available by contacting the lead author. We would like to gratefully thank K. Baczynska and her colleagues at Public Health England (PHE) for their great support and hosting during the measurements.
This work was financed by the Institute for Occupational Safety and Health in the framework of the GENESIS-UV research project (IFA4207) as part of a PhD grant of the German Social Accident Insurance.
- BKV (1997) Berufskrankheiten-Verordnung vom 31. Oktober 1997 (BGBl. | S. 2623), die zuletzt durch Artikel 1 der Verordnung vom 10. Juli 2017 (BGBl. | S. 2299) geändert worden ist. German lawGoogle Scholar
- CIE (1987) A reference action spectrum for ultraviolet induced erythema in human skin. CIE Research Note. CIE J 6:17–22Google Scholar
- CIE (2014) Rationalizing nomenclature for UV doses and effects on humans, vol 209. WMO/GAW Report No 211. ISBN 978-3-902842-35-0Google Scholar
- di Sarra A, Cacciani M, Chamard P, Cornwall C, DeLuisi JJ, Di Iorio T, Disterhoft P, Fiocco G, Fuà D, Monteleone F (2002) Effects of desert dust and ozone on the ultraviolet irradiance at the Mediterranean island of Lampedusa during PAUR II. J Geophys Res 107(D18):8135. https://doi.org/10.1029/2000JD000139 CrossRefGoogle Scholar
- Koch G, Wernli H, Staehelin J, Peter T (2003) Reply to comment by H. Teitelbaum et al. on A Lagrangian analysis of stratospheric ozone variability and long-term trends above Payerne (Switzerland) during 1970-2001. J Geophys Res 108(D21):4675. https://doi.org/10.1029/2003JD003911 CrossRefGoogle Scholar
- Madronich S (1993) UV radiation in the natural and perturbed atmosphere in environmental effects of ultraviolet radiation, edited by M. Tevini. Lewis, Boca Raton, pp 17–69Google Scholar
- Nishanth T, Joseph S, PKM, Kumar M (2011) Correlative study between UV irradiance and TOC using AURA OMI at kannur (12.3N, 75.4E). Atmos Clim Sci 1(2):55–60Google Scholar
- Petkov B, Vitale V, Tomasi C, Siani A, Seckmeyer G, Webb A, Smedley A, Casale G, Werner R, Lanconelli C, Mazzola M, Lupi A, Busetto M, Diémoz H, Goutail F, Köhler U, Mendeva BD, Josefsson W, Moore D, Bartolomé M, González J, Mišaga O, Dahlback A, Tóth Z, Varghese S, De Backer H, Stübi R, Vaníček K (2014) Response of the ozone column over Europe to the 2011 Arctic ozone depletion event according to ground-based observations and assessment of the consequent variations in surface UV irradiance. Atmos Environ 85:169–178CrossRefGoogle Scholar
- Petropavlovskikh I, Evans R, McConville G, Manney GL, Rieder HE (2015) The influence of the North Atlantic Oscillation and El niño-southern Oscillation on mean and extreme values of column ozone over the United States. Atmos Chem Phys 15:1585–1598. https://doi.org/10.5194/acp-15-1585-2015 CrossRefGoogle Scholar
- Rieder HE, Staehelin J, Maeder JA, Peter T, Ribatet M, Davison AC, Stuebi R, Weihs P, Holawe F (2010b) Extreme events in total ozone over Arosa - Part 2: fingerprints of atmospheric dynamics and chemistry and effects on mean values and long-term changes. Atmos Chem Phys 10:10033–10045. https://doi.org/10.5194/acp-10-10033-2010 CrossRefGoogle Scholar
- Rieder HE, Jansco LM, Di Rocco S, Staehelin J, Maeder JA, Peter T, Ribatet M, Davison AC, De Backer H, Koehler U, Krzyścin J, Vanicek K (2011) Extreme events in total ozone over the Northern mid-latitudes: an analysis based on long-term data sets from five European ground-based stations. Tellus 63B:860–874. https://doi.org/10.1111/j.1600-0889.2011.00575.x CrossRefGoogle Scholar
- World Meteorological Organization (2010) Guide to meteorological instruments and methods of observation. WMO-No. 8, 2008 edition updated in 2010Google Scholar