Kelbch, Alexander: Investigations to quantify individual exposure to solar ultraviolet erythemal radiation including cloud meteorological impact. - Bonn, 2020. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc:
author = {{Alexander Kelbch}},
title = {Investigations to quantify individual exposure to solar ultraviolet erythemal radiation including cloud meteorological impact},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2020,
month = jul,

volume = 90,
note = {Combined meteorological and dosimetric ultraviolet (UV) erythemal radiation (UVER) measurements were performed in 2016 and 2017. Based on collected data sets the actual UVER exposure of outdoor working probands is determined and compared to the globally available UVER dose during their working shifts. The highest absolute UVER dose (7.94 SED) was measured by a track worker which is 23.4% of the maximum possible UVER dose. For each combined measurement event the UV index (UVI) is calculated based on horizontally collected global dosimetric UVER data and compared to the respective public UV hazard forecast provided by the German Meteorological Service (DWD). As a result, the actual UVI is never overestimated. For 56% of the cases UVI forecast and corresponding measurement agree with an absolute difference of 1 UVI. In one case differences up to 8 UVI are observed. The cloud meteorological impact on personal UVER exposure is investigated based on horizontally collected dosimetric UVER data of 16 and 17 August 2016 in Jena. A nonlinear regression was performed to derive a clear sky UVER data set for both days. For both the measured and estimated UVER data sets SimUVEx model simulations were performed. By comparing these simulation results the cloud meteorological impact on the UVER exposure of a human posture is determined and visualized. The trunk front anatomical zone shows the largest relative global UVER dose increase (19.2%). The relative diffuse UVER dose increase, however, is found to be significantly lower and amounts to the same value (3.6%) for all anatomical zones. On 6 and 7 April 2017 meteorological and dosimetric UVER measurements were also performed in Didcot, England. Both days were characterized by clear-sky conditions in the morning and the afternoon with the development of shallow stratocumulus clouds (SSC) around noon. On 7 April a low-ozone event occurred being characterized by a 34 DU (Dobson Unit) drop in total stratospheric ozone content. Compared to 6 April, the ozone mini-hole caused UVER dose increases of 2.67 standard erythema dose (SED) for the diffuse and 4.32 SED for the global radiation part being characterized by radiation amplification factors (RAF) of 1.62 and 1.52, respectively. 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. For this event also a mean spectral COF is calculated based on global UVER spectroradiometer data. As a result the minimum mean spectral COF values amount to ~0.02 in the spectral range between 305 - 310 nm indicating almost no cloud impact on the UVER dose ratio despite cloudy conditions.},
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