Salient features of spectral composition of ground-level UV radiation at Irkutsk

2003 ◽  
Author(s):  
Anton Y. Shalin
Keyword(s):  
Uv Radiation ◽  
Spectral Composition ◽  
Ground Level ◽  
Salient Features

scholarly journals The Early Days of Personal Solar Ultraviolet Dosimetry

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 125 ◽  
Author(s):  
Brian Diffey
Keyword(s):  
Uv Radiation ◽  
Human Exposure ◽  
Ground Level ◽  
Uv Exposure ◽  
Population Exposure ◽  
Atmospheric Ozone ◽  
Quantitative Understanding ◽  
Solar Uv ◽  
The Impact ◽  
Solar Ultraviolet

In the early 1970s, environmental conservationists were becoming concerned that a reduction in the thickness of the atmospheric ozone layer would lead to increased levels of ultraviolet (UV) radiation at ground level, resulting in higher population exposure to UV and subsequent harm, especially a rise in skin cancer. At the time, no measurements had been reported on the normal levels of solar UV radiation which populations received in their usual environment, so this lack of data, coupled with increasing concerns about the impact to human health, led to the development of simple devices that monitored personal UV exposure. The first and most widely used UV dosimeter was the polymer film, polysulphone, and this review describes its properties and some of the pioneering studies using the dosimeter that led to a quantitative understanding of human exposure to sunlight in a variety of behavioral, occupational, and geographical settings.

scholarly journals Surface ultraviolet radiation over east Siberia: seasonal variations

2002 ◽  
Vol 20 (4) ◽  
pp. 559-564
Author(s):  
A. V. Mikhalev ◽  
M. A. Chernigovskaya ◽  
A. Yu. Shalin ◽  
E. S. Kazimirovsky
Keyword(s):  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Middle Atmosphere ◽  
Ground Level ◽  
Atmospheric Composition ◽  
Time Interval ◽  
East Siberia ◽  
Solar Ultraviolet Radiation ◽  
Composition And Structure ◽  
Asymmetric Behaviour

Abstract. The results of spectral measurements of the daily near-noon surface direct solar ultraviolet radiation in the wavelength range of 295–345 nm obtained in Irkutsk (East Siberia) for the time interval of 1998–2000 are presented. For the period under consideration, the seasonal UV radiation variations are analysed that are associated with the total ozone dynamics, the transition of cyclonic and anticyclonic (Siberian anticyclone) periods, the presence of snow cover, and other factors. The analysis reveals an asymmetric behaviour of the seasonal course in ground-level UV radiation around the time of the summer solstice, with seasonal variation dependence on the wavelength. We have determined the irregular variations of surface UV radiation that is typical for the region, with their properties dependent on the season and on the spectral range analysed. The similarity of the above noted features from year to year was revealed.Key words. Atmospheric composition and structure (Transmission and scattering of radiation; instruments and techniques) – Meteorology and atmospheric dynamics (middle atmosphere dynamics)

scholarly journals Correcting spaceborne reflectivity measurements for application in solar ultraviolet radiation levels calculations at ground level

2012 ◽  
Vol 5 (1) ◽  
pp. 61-96
Author(s):  
P. N. den Outer ◽  
A. van Dijk ◽  
H. Slaper ◽  
A. V. Lindfors ◽  
H. De Backer ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Ground Level ◽  
Ozone Monitoring Instrument ◽  
Solar Ultraviolet Radiation ◽  
Major Drawback ◽  
Data Set ◽  
European Continent ◽  
Wind Speeds ◽  
Average Wind ◽  
Large Correction

Abstract. The Lambertian Equivalent Reflection (LER) produced by satellite-carried instruments is used to determine cloud effects on ground level UltraViolet (UV) radiation. The focus is on data use from consecutive operating instruments: the Total Ozone Mapping Spectrometers (TOMS) flown on Nimbus 7 from 1979 to 1992, TOMS on Earth Probe from 1996 to 2005, and the Ozone Monitoring Instrument (OMI) flown on Aura since 2004. The LER data produced by TOMS on Earth Probe is only included until 2002. The possibility to use the Radiative Cloud Fraction (RCF)-product of OMI is also investigated. A comparison is made with cloud effects inferred from ground-based pyranometer measurements at over 83 World Radiation Data Centre stations. Modelled UV irradiances utilizing LER data are compared with measurements of UV irradiances at eight European low elevation stations. The LER data set of the two TOMS instruments shows a consistent agreement, and the required corrections are of low percentage i.e. 2–3%. In contrast, the LER data of OMI requires correction of 7–10%, and a solar angle dependency therein is more pronounced. These corrections were inferred from a comparison with pyranometer data, and tested using the UV measurements. The RCF product of OMI requires a large correction but can then be implemented as a cloud effect proxy. However, a major drawback of RCF is the large number of clipped data, i.e. 18%, and results are not better than those obtained with the corrected LER product of OMI. The average reduction of UV radiation due to clouds for all sites together indicate a small trend: a diminishing cloudiness, in line with ground-based UV observations. Uncorrected implementation of LER would have indicated the opposite. An optimal field of view of 1.25° was established for LER data to calculate UV radiations levels. The corresponding area can be traversed within 5–7 h at the average wind speeds found for the West European continent.

Depletion of the ozone layer: consequences for non-infectious human diseases

Parasitology ◽  
1993 ◽  
Vol 106 (S1) ◽  
pp. S39-S46 ◽  
Author(s):  
G. Bentham
Keyword(s):  
Health Effects ◽  
Uv Radiation ◽  
Ozone Depletion ◽  
Stratospheric Ozone ◽  
Ground Level ◽  
Uv Exposure ◽  
Cumulative Exposure ◽  
Human Populations ◽  
Stratospheric Ozone Depletion ◽  
Immunological Effects

SUMMARYStratospheric ozone depletion threatens to increase exposure to ultraviolet (UV) radiation which is known to be a factor in a number of diseases. There is little doubt that cumulative exposure to UV radiation is important in the aetiology of non-melanoma skin cancers. Evidence is also strong for a link with cutaneous malignant melanoma, although here it appears to be intermittent intense exposure that is most damaging. More controversial is the view that exposure to solar radiation is a significant factor in ocular damage, particularly in the formation of cataracts. Earlier studies pointing to such an effect have been criticized and alternative aetiological hypotheses have been proposed. However, other studies do show an effect of UV exposure on cortical cataract. Concern is also growing that UV may be capable of activating viruses and have immunological effects that might exacerbate infectious disease. Very worrying is the possibility that UV exposure can activate the human immunodeficiency virus which might accelerate the onset of AIDS. Any such health effects that have been observed in human populations are the result of exposure to existing, naturally occurring levels of UV radiation. There is, therefore, great concern about the possible exacerbation of these impacts as a result of increased exposure to UV radiation associated with stratospheric ozone depletion. However, any assessment of the nature and scale of such impacts on human health has to deal with several major problems and these are the focus of this paper. There are uncertainties about recent trends in stratospheric ozone and problems in the prediction of future changes. Following on from this are the difficulties of estimating what effects these changes will have on UV flux at ground level in populated areas. Further problems arise in the prediction of changes in biologically significant doses to humans which might be affected by changes in behaviour as well as by changes in the environment. Finally, the limitations of existing epidemiological knowledge of the effects of UV exposure are a constraint on our ability to predict what the health effects of any changed UV doses might be.

scholarly journals ULTRAVIOLET RADIATION AND GROUND‐LEVEL OZONE VARIATION IN LITHUANIA

2005 ◽  
Vol 13 (1) ◽  
pp. 31-36 ◽  
Author(s):  
Renata Chadyšiene ◽  
Rasele Girgždiene ◽  
Aloyzas Girgždys
Keyword(s):  
Uv Radiation ◽  
Ozone Concentration ◽  
Preliminary Analysis ◽  
Ground Level ◽  
Maximum Intensity ◽  
Uvb Radiation ◽  
Ground Level Ozone ◽  
Ozone Variation ◽  
Investigation Period ◽  
Uva Radiation

Preliminary analysis of the data of ultraviolet (UV) radiation and ground‐level ozone concentration measurements from Rugšteliškes Monitoring Station over the years 2002–2003 is presented. Observations showed that an average UV radiation value in January and July of 2002 differed about 10 times. Maximum intensity of UVA radiation was observed in July (about 2,4 W/m2), and minimal one ‐ in December (0,1 W/m2), the highest UVB radiation intensity was in May (0,09 W/m2), while a minimal UVB radiation value as well as that of UVA was registered in December (0,07 W/m2). Relationship between the highest ozone concentration and UVB radiation values during the summer of the investigation period was found to be linear.

scholarly journals Analysis of relationships between ultraviolet radiation (295–385 nm) and aerosols as well as shortwave radiation in North China Plain

2008 ◽  
Vol 26 (7) ◽  
pp. 2043-2052 ◽  
Author(s):  
X. Xia ◽  
Z. Li ◽  
P. Wang ◽  
M. Cribb ◽  
H. Chen ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Zenith Angle ◽  
Solar Zenith Angle ◽  
Precipitable Water ◽  
Ground Level ◽  
Weather Conditions ◽  
Northern China ◽  
Shortwave Radiation ◽  
Relevant Variables

Abstract. The fraction of ultraviolet (UV) radiation to broadband shortwave (SW) radiation (FUV=UV/SW) and the influences of aerosol, precipitable water vapor content (PWV) and snow on FUV were examined using two year's worth of ground-based measurements of relevant variables in northern China. The annual mean FUV was 3.85%. Larger monthly values occurred in summer and minimum appeared in winter. Under cloudless condition, FUV decreased linearly with τ500 nm and the resulting regression indicated a reduction of about 26% in daily FUV per unit τ500 nm, implying that aerosol is an efficient agent in lowering the ground-level UV radiation, especially when the sun is high. Given that the annual mean τ500 nm is 0.82, aerosol induced reduction in surface UV radiation was from 24% to 74% when the solar zenith angle (θ) changed from 20° to 80°. One cm of PWV led to an increase of about 17% in daily FUV. One case study of snow influence on surface irradiance showed that UV and SW radiation increased simultaneously when the ground was covered with snow, but SW radiation increased much less than UV radiation. Accordingly, FUV increased by 20% for this case. Models were developed to describe the dependence of instantaneous UV radiation on aerosol optical depth, the cosine of the solar zenith angle (μ), and clearness index (Kt) under both clear and all-weather conditions.

scholarly journals Applying spaceborne reflectivity measurements for calculation of the solar ultraviolet radiation at ground level

2012 ◽  
Vol 5 (12) ◽  
pp. 3041-3054 ◽  
Author(s):  
P. N. den Outer ◽  
A. van Dijk ◽  
H. Slaper ◽  
A. V. Lindfors ◽  
H. De Backer ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Ground Level ◽  
Ozone Monitoring Instrument ◽  
Solar Ultraviolet Radiation ◽  
European Continent ◽  
Wind Speeds ◽  
Average Wind ◽  
Reflectivity Data ◽  
Optimal Area

Abstract. Long-term analysis of cloud effects on ultraviolet (UV) radiation on the ground using spaceborne observations requires the use of instruments that have operated consecutively. The longest data record can be built from the reflectivity measurements produced by the instruments Total Ozone Mapping Spectrometers (TOMS) flown on Nimbus 7 from 1979 to 1992, TOMS on Earth Probe from 1996 to 2005, and the Ozone Monitoring Instrument (OMI) flown on EOS Aura since 2004. The reflectivity data produced by TOMS on Earth Probe is only included until 2002. A comparison is made with cloud effects inferred from ground-based pyranometer measurements at over 83 World Radiation Data Centre stations. Modelled UV irradiances utilizing the standard reflectivity are compared with measurements of UV irradiances at eight European low-elevation stations. The reflectivity data of the two TOMS instruments shows a consistent agreement, and the required corrections are of low percentage, i.e. 2–3%. In contrast, the reflectivity product of OMI requires correction of 7–10%, and a solar angle dependency therein is more pronounced. These corrections were inferred from a comparison with pyranometer data, and tested using the UV measurements. The average reduction of UV radiation due to clouds for all sites together indicates a small trend: a diminishing cloudiness, in line with ground-based UV observations. Uncorrected implementation of the reflectivity data would have indicated the opposite. An optimal area was established for reflectivity data for the calculation of daily sums of UV radiation. It measures approximately 1.25° in latitudinal direction for square-shaped areas overhead the ground-based UV stations. Such an area can be traversed within 5 to 7 h at the average wind speeds found for the West European continent.

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