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Quantifying the effects of a low-ozone event and shallow stratocumulus clouds on ultraviolet erythemal radiation exposure

  • A. KelbchEmail author
  • M. Wittlich
  • A. Bott
Original Paper
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Abstract

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.

Keywords

Low-ozone event Shallow stratocumulus clouds UV erythemal radiation GENESIS-UV 
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Notes

Acknowledgements

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.

Funding information

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.

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© ISB 2019

Authors and Affiliations

  1. 1.Institute for Geosciences and MeteorologyUniversity of BonnBonnGermany
  2. 2.Institute for Occupational Safety and Health of the German Social Accident InsuranceSankt AugustinGermany

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