Aerosol effects on UV radiation in nonurban regions

Reuder, Joachim; Schwander, Harry

doi:10.1029/1998jd200072

Cited by 65 publications

(50 citation statements)

References 29 publications

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“…It has also been shown by that UVB irradiance may change by 2 to 35% if the aerosol optical depth varies between 0.2 and 1 at 355 nm. Similarly Reuder & Schwander (1999) found a reduction of 25% of UV irradiances between clean (AOD = 0.1, Single Scattering Albedo SSA = 0.95 at 400 nm) and turbid (AOD = 0.8, SSA = 0.88 at 400 nm) atmospheres. Although the empirical models do not include an explicit treatment of aerosols, their relatively good correspondences can be explained by the fact that the regression technique implicitly takes aerosols into account.…”

Section: Comparison Between Models and Measurementsmentioning

confidence: 99%

Comparison of measured and modelled uv indices for the assessment of health risks

Backer

Koepke

Bais

et al. 2001

Meteorological Applications

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The World Health Organisation (WHO) and the World Meteorological Organisation (WMO) have jointly recommended that the UV Index (UVI) should be used to inform the public about possible health risks due to overexposure to solar radiation, especially skin damage. To test the current operational status of measuring and modelling techniques used in providing the public with UVI information, this article compares cloudless sky UVIs (measured using five instruments at four locations with different latitudes and climate) with the results of 13 models used in UVI forecasting schemes. For the models, only location, total ozone and solar zenith angle were provided as input parameters. In many cases the agreement is acceptable, i.e. less than 0.5 UVI. Larger differences may originate from instrumental errors and shortcomings in the models and their input parameters. A possible explanation for the differences between models is the treatment of the unknown input parameters, especially aerosols. Copyright © 2001 Royal Meteorological Society

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Section: Comparison Between Models and Measurementsmentioning

confidence: 99%

Comparison of measured and modelled uv indices for the assessment of health risks

Backer

Koepke

Bais

et al. 2001

Meteorological Applications

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“…In order to study this variability in AOD in more detail, we used HYSPLIT-based trajectories (Rolph, 2003) to determine the origin of air masses arriving at Tõravere, as well as MODIS Fire Mapper products to give an idea about the location and extent of fires at each day. Figure 4 shows the active fires detected by the MODIS Rapid Response System from 28 April to 30 April.…”

Section: Comparison Of Modis and Aeronet Derived Aodmentioning

confidence: 99%

“…Earlier results indeed indicate that aerosols can cause a considerable reduction in the surface UV irradiance. In the extreme, this reduction can be up to 50% (e.g., Reuder and Schwander, 1999;Krotkov et al, 1998), although more typical values for this reduction associated with biomass burning aerosols range from 15-35% (e.g., Latha et al, 2004;Kalashnikova et al, 2007). The net effect that atmospheric aerosols exert on the surface radiation is a complex matter and strongly depends on both scattering and absorption characteristics, which in turn depend on wavelength and relative humidity.…”

Section: Introductionmentioning

confidence: 99%

A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels

et al. 2007

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Abstract. In spring 2006, biomass burning aerosols from eastern Europe were transported extensively to Finland, and to other parts of northern Europe. They were observed as far as in the European Arctic. In the first part of this paper, temporal and spatial evolution and transport of these biomass burning aerosols are monitored with MODIS retrieved aerosol optical depth (AOD) imagery at visible wavelengths (0.55 µm). Comparison of MODIS and AERONET AOD is conducted at Tõravere, Estonia. Then trajectory analyses, as well as MODIS Fire Mapper products are used to better understand the type and origin of the air masses. During the studied four-week period AOD values ranged from near zero up to 1.2 at 0.55 µm and the linear correlation between MODIS and AERONET was very high (∼0.97). Temporal variability observed within this fourweek period was also rather well explained by the trajectory analysis in conjunction with the fire detections produced by the MODIS Rapid Response System. In the second part of our study, the surface measurements of global and UV radiation at Jokioinen, Finland are used to study the effect of this haze episode on the levels of surface radiation. We found reductions up to 35% in noon-time surface UV irradiance (at 340 nm) as compared to typical aerosol conditions. For global (total solar) radiation, the reduction was always smaller, in line with the expected wavelength dependence of the aerosol effect.

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“…The total column ozone amount is particularly important as ozone is the dominant atmospheric absorber of UV-B and UV-C radiation (UNEP 1998). Furthermore, UV doses depend strongly on aerosol loading (e.g., Kazadzis et al 2007;Reuder and Schwander 1999;Ruckstuhl et al 2008), surface albedo (e.g., Blumthaler and Ambach 1988), and altitude (e.g., Blumthaler et al 1997;Schmucki and Philipona 2002). Cloudiness often masks the influence of TCO changes on UV radiation and may, depending on cloud type and amount, cancel, reduce, or enhance UV signals (e.g., Bais et al 1993;Feister et al 2015;Glandorf et al 2005;Rieder et al 2010c;Seckmeyer et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Influence of low ozone episodes on erythemal UV-B radiation in Austria

Schwarz

Baumgartner

Pietsch

et al. 2017

Theor Appl Climatol

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This study investigates the influence of low ozone episodes on UV-B radiation in Austria during the period 1999 to 2015. To this aim observations of total column ozone (TCO) in the Greater Alpine Region (Arosa, Switzerland; Hohenpeissenberg, Germany; Hradec Kralove, Czech Republic; Sonnblick, Austria), and erythemal UV-B radiation, available from 12 sites of the Austrian UV-B monitoring network, are analyzed. As previous definitions for low ozone episodes are not particularly suited to investigate effects on UV radiation, a novel threshold approach-considering anomalies-is developed to provide a joint framework for the analysis of extremes. TCO and UV extremes are negatively correlated, although modulating effects of sunshine duration impact the robustness of the statistical relationship. Therefore, information on relative sunshine duration (SD rel ), available at (or nearby) UV-B monitoring sites, is included as explanatory variable in the analysis. The joint analysis of anomalies of both UV index (UVI) and total ozone (ΔUVI, ΔTCO) and SD rel across sites shows that more than 65% of observations with strongly negative ozone anomalies (ΔTCO < −1) led to positive UVI anomalies. Considering only days with strongly positive UVI anomaly (ΔUVI > 1), we find (across all sites) that about 90% correspond to negative ΔTCO. The remaining 10% of days occurred during fair weather conditions (SD rel ≥ 80%) explaining the appearance of ΔUVI > 1 despite positive TCO anomalies. Further, we introduce an anomaly amplification factor (AAF), which quantifies the expected change of the ΔUVI for a given change in ΔTCO.

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Aerosol effects on UV radiation in nonurban regions

Cited by 65 publications

References 29 publications

Comparison of measured and modelled uv indices for the assessment of health risks

Comparison of measured and modelled uv indices for the assessment of health risks

A case study on biomass burning aerosols: effects on aerosol optical properties and surface radiation levels

Influence of low ozone episodes on erythemal UV-B radiation in Austria

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