Existing and natural background levels of visibility and fine particles in the rural east

Trijonis, John

doi:10.1016/0004-6981(82)90133-0

Cited by 33 publications

(10 citation statements)

References 28 publications

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“…However,. this seasonal dependence is not consistent with a study byTrijonis (1982) which showed about 25% smaller visual range in summer than other seasons.…”

contrasting

confidence: 99%

Effect of anthropogenic aerosols on biologically active ultraviolet radiation

Liu

McKeen

Madronich

1991

Geophysical Research Letters

160

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Aerosols from anthropogenic sources contribute significantly to the scattering of solar radiation in the atmosphere over most populated areas. By using observed values of visual range we estimate that in non‐urban areas of the industrialized countries the amount of biologically active solar radiation (UVB, 280 to 315 nm) reaching the surface has decreased by a range of 5 to 18% since the industrial revolution, primarily due to aerosols formed from emissions of sulfur dioxide (SO2). The UVB reduction in the industrialized countries may have offset partly or fully the UVB increases associated with current stratospheric ozone depletion at NH continental mid‐latitudes. However, this offset is not expected to continue because the SO2 emissions are leveling off in the industrialized countries.

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“…However,. this seasonal dependence is not consistent with a study byTrijonis (1982) which showed about 25% smaller visual range in summer than other seasons.…”

contrasting

confidence: 99%

Effect of anthropogenic aerosols on biologically active ultraviolet radiation

Liu

McKeen

Madronich

1991

Geophysical Research Letters

160

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“…The spatial and temporal trends, as well as manmade influences on atmospheric visibility have attracted considerable attention from researchers worldwide as part of scientific and regulatory studies [ Elridge , 1966; Munn , 1973; Husar et al , 1979; Ferman et al , 1981; Husar et al , 1981; Sloane , 1982a, 1982b; Trijonis , 1982; Husar and Wilson , 1993; Lee and Sequeira , 2001]. Sloane [1982a, 1982b] has examined the methods to determine trends in visibility due to air pollution.…”

Section: Introductionmentioning

confidence: 99%

Horizontal visibility trends in China 1981–2005

Che¹,

Zhang²,

Li³

et al. 2007

Geophysical Research Letters

223

138

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[1] Trends in Chinese horizontal visibility, the frequency of visibility >19 km, and haziness for the period between 1981 and 2005 were evaluated based on data for daily horizontal visibility. Annual means were calculated for each station and for China as a whole. Linear regression analysis was used to characterize long-term annual trends in these variables. Over the past 25 years, there has been a significant decrease in horizontal visibility (À2.1 km per decade from 1990 to 2005) and the frequency of visibility >19 km (À3.5% per decade) but a significant increase in the 75th percentile annual extinction coefficients (25% per 25 year). According to rapid increase of total energy consumption, the consistent spatial and temporal variations of visibility and haze support the speculation that increased aerosol loadings were responsible for the observed decreases in horizontal visibility over much of East China.

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“…The atmospheric extinction coefficient and parameters derived from the extinction coefficient describe visual air quality. Visibility degradation is the loss of contrast between the object and the background and arises from the attenuation of light by fine particles and gaseous pollutants (Trijonis 1982).…”

Section: Introductionmentioning

confidence: 99%

Visibility impairing aerosols in the urban atmosphere of Delhi

Singh

Khillare

Shridhar

et al. 2007

Environ Monit Assess

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To study the visual air quality of Delhi, size fractionated aerosols - coarse and fine fractions of PM10 - were collected and analysed for SO4(-2), NO(-3), NH4+ and EC at three sites with different background activities. The analysed species constitute a smaller portion of coarse fraction (39%) but a larger portion of fine fraction (69%). The sampling was performed from June 2003 to November 2003 which covers monsoon and post monsoon seasons. Aerosol data was used to describe the spatial variation of Visibility Range as a function of chemical composition of visibility impairing aerosols. During the study period, visibility was found to be poor varying between 4.7 and 13 km with an average value of 9.4 km. It is observed that visibility impairment was more due to carbonaceous aerosol followed by sulphate.

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Existing and natural background levels of visibility and fine particles in the rural east

Cited by 33 publications

References 28 publications

Effect of anthropogenic aerosols on biologically active ultraviolet radiation

Effect of anthropogenic aerosols on biologically active ultraviolet radiation

Horizontal visibility trends in China 1981–2005

Visibility impairing aerosols in the urban atmosphere of Delhi

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