Assessment of the Potential for Photochemical Air Pollution in Athens: A Comparison of Emissions and Air-Pollutant Levels in Athens with Those in Los Angeles

Mantis, Homer T.; Repapis, C. C.; Zerefos, C. S.; Ziomas, John C.

doi:10.1175/1520-0450(1992)031<1467:aotpfp>2.0.co;2

Cited by 64 publications

(21 citation statements)

References 5 publications

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“…The city is located within a natural basin that is about 600 km 2 large. 18 It is open to the Aegean Sea toward the SW and surrounded by mountains and ridges of various altitudes in the NW, NE, and SE ( Figure 1). …”

Section: Methodsmentioning

confidence: 99%

Urban Emissions Measured with Aircraft

Klemm

Ziomas

1998

Journal of the Air & Waste Management Association

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Detailed knowledge of the quantity and composition of urban emissions is a prerequisite for successful application of atmospheric models to predict transport and distribution of primary and secondary air pollutants in the troposphere. We investigate the prospects and limitations of aircraft measurements in the determination of emission fluxes from urban areas. Our analysis focuses on data collected in September 1994 in and around Athens, Greece. Generally, emission fluxes from cities can be quantified with aircraft and with the minimum acceptable precision (uncertainty better than a factor of 2) only under very favorable meteorological conditions, namely in a homogeneous flow field in a well-mixed boundary layer. Better accuracy can be achieved only through ensemble averaging of repeated measurements. From our measurements in the Athens area, we deduced relative emission ratios of pollutant gases. With the support of ground-based measurements in a street canyon, the emission ratios NO x /CO, SO 2 /CO, and volatile organic compounds/CO (34 individual VOCs) could be determined with high precision. These results are very useful in analyzing differences between various existing emission inventories. Our data for VOCs reveal that the non-traffic emissions are of the same magnitude as the emissions originating from traffic.

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Section: Methodsmentioning

confidence: 99%

Urban Emissions Measured with Aircraft

Klemm

Ziomas

1998

Journal of the Air & Waste Management Association

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“…The main sources of air pollution are the industries located primarily in the south-western edge of the basin, and the increasing number of vehicles. Its topographic characteristics coupled with Mediterranean climatological conditions and intense pollutant emissions often make air quality as bad as that of Los Angeles and similar cities (Mantis et al 1992). Under favourable meteorological conditions (mainly sea breezes or calms) the concentration of air pollutants may exceed the air quality standards of the European Union and the World Heath Organization (MINENV 1998).…”

Section: Topography and Data Collectionmentioning

confidence: 99%

Investigation into the wavelength dependence of the aerosol optical depth in the Athens area

Kaskaoutis

Kambezidis

2006

Quart J Royal Meteoro Soc

107

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SUMMARYGround-based solar spectral irradiance measurements obtained by a spectroradiometer have been used to retrieve the aerosol optical depth, τ α , and theÅngström wavelength exponent, α. These measurements were obtained in the Athens centre in May 1995. Exponent α is frequently computed from spectral measurements both from ground-based photometers and satellite remote sensing retrievals. Although the retrieval of α has been the subject of many studies worldwide, its spectral variation is typically not considered. In this study we analyse the spectral measurements of ln τ α versus ln λ, where λ is the wavelength, at six selected wavelengths which cover the spectrum from 340 to 870 nm. It is obvious that there is significant curvature in the ln τ α versus ln λ relationship, and the reasons for this are examined. It was found that this curvature depends on both atmospheric turbidity and aerosol optical properties, and a second order polynomial fit provides excellent agreement. The curvature of the polynomial equation becomes greater as the aerosol loading alters from high to low. The curvature is characterized by the second derivative of α, which can be utilized in conjunction with α to characterize the spectral dependence of aerosol optical depth, and can also be used as an indicator of the relative influence of fineversus coarse-mode particles.

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“…The main sources of air pollution are the industries primarily located in the SW edge of the basin and the increasing number of vehicles. Its topographic characteristics coupled with Mediterranean climatological conditions and intense pollutant emissions often make air quality as bad as that of Los Angeles, and other cities (CVITAS et al, 1985;MANTIS et al, 1992). Thus, under favorable meteorological conditions (LALAS et al, 1982;KATSOULIS, 1988;ADAMOPOULOS et al, 1996a,b,c), the concentration of air pollutants may exceed the air quality standards of the European Union and the World Health Organisation (EARTH, 1998).…”

Section: Topography and Local Climatologymentioning

confidence: 99%

Determination of Ångström and Schüepp's Parameters from Ground-based Spectral Measurements of Beam Irradiance in the Ultraviolet and Visible Spectrum in Athens, Greece

Kambezidis¹,

Adamopoulos²,

Zevgolis³

2001

Pure appl. geophys.

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Ð This work estimates the A Ê ngstroÈ m coecients, assuming a linear behavior of the natural logarithm of aerosol optical thickness, ln d a (k), versus the natural logarithm of wavelength, ln k, in the urban environment of Athens for a period of one year. The calculation of the coecients a, b, was carried out using records of spectral beam irradiance in the 320±575 nm spectral range. The seasonal and diurnal variation of the coecients shows dierent features with generally higher values of b and lower values of a in summertime. The A Ê ngstroÈ m coecients are investigated with respect to various wind regimes and the results are discussed with a view to air pollution sources, climatic and topographic characteristics of the Athens basin. A similar study is also carried out for the SchuÈ epp's turbidity parameter.

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Assessment of the Potential for Photochemical Air Pollution in Athens: A Comparison of Emissions and Air-Pollutant Levels in Athens with Those in Los Angeles

Cited by 64 publications

References 5 publications

Urban Emissions Measured with Aircraft

Urban Emissions Measured with Aircraft

Investigation into the wavelength dependence of the aerosol optical depth in the Athens area

Determination of Ångström and Schüepp's Parameters from Ground-based Spectral Measurements of Beam Irradiance in the Ultraviolet and Visible Spectrum in Athens, Greece

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