Analysis of climatological and air quality observations from Greater Athens Area

Kassomenos, Pavlos; Kotroni, Vassiliki; Κάλλος, Γ.

doi:10.1016/1352-2310(94)00358-r

Cited by 103 publications

(59 citation statements)

References 19 publications

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“…In summer, we observe a small plateau between the 850-750 hPa pressure levels. This form may be due to intense radiative cooling and the large number of calms that occur on summer nights in the area of Athens (Kassomenos et al, 1995). At 750 hPa and above, inversions are clearly frontal or advectional.…”

Section: Methodsmentioning

confidence: 99%

“…The reason for this maximum is the propitious conditions that appear quite often and through all seasons. Thus, in summer, the prevalent anticyclonic conditions, with the consequent cloudless skies and increased proportion of calms (about 40%; Kassomenos et al, 1995), favour the formation of surface inversions. In winter, during the last 2 months of the season, anticyclones remain stationary over the area for considerable time intervals (Omega-block circulation).…”

Section: Methodsmentioning

confidence: 99%

“…In Greece, and especially in the area of Athens, certain researchers have made studies in the past relating not only to inversions and the conditions of their formation (Katsoulis, 1988;Kassomenos et al, 1995), but also to the synoptic-scale circulations of each season, during persistent inversions (Prezerakos, 1998). There are fewer studies referring to other natural processes of inversion formation, besides capping inversions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Seasonal variation of the temperature inversions over Athens, Greece

Kassomenos

Koletsis

2005

Int. J. Climatol.

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This study examines the frequency of appearance and the characteristics of temperature inversions over Athens, up to the pressure level of 500 hPa, for the time period 1974-2001 on a seasonal basis. The analysis is carried out separately for daytime and nocturnal inversions. Moreover, the study includes a brief reference to the synoptic conditions that favour the formation of inversions for each season. The results of the analysis show that nocturnal surface inversions appear with great frequency during all seasons and that the majority of the rest of the inversions appear in winter, in the region between the 800 and 900 hPa pressure levels.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal variation of the temperature inversions over Athens, Greece

Kassomenos

Koletsis

2005

Int. J. Climatol.

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“…Generally, in the greater Athens area (GAA) the atmospheric circulation results from the interaction of different scales: synoptic, regional, meso and microscale. 28,29 During summer, when the pressure gradient is weak, the synoptic circulation is weak and the local circulations define the dispersion conditions. On the contrary, when the pressure gradient is strong, northerly winds (stronger during the day and weaker during the night) dominate, creating good ventilation in the Athens basin.…”

Section: Resultsmentioning

confidence: 99%

Dispersion of Volatile Hydrocarbons in Urban Street Canyons

Bakeas

Siskos

2003

Journal of the Air & Waste Management Association

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Volatile hydrocarbons (VHCs) were monitored in two urban street canyons for 16 days. Measurements of 15 selected VHCs were performed simultaneously at three different sampling heights: at street level (2 m), at 8 m, and at the rooftop (25 m above the ground). The aim of the study was to investigate the factors responsible for the horizontal and vertical changes in VHC concentrations. Physical parameters controlling the concentration gradients (wind flow and speed) were enabled. It was concluded that dilution and dispersion decrease the concentrations of HCs emitted at street level by approximately a factor of 6 between rooftop and street levels. Low winds and winds parallel to the street axis were identified as the worst dispersion conditions. The correlation between the measured VHC concentrations gave an insight into their fate. An empirical relationship between CO and benzene was established. These results may have important implications in planning monitoring studies to support research on population exposure in urban areas.

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“…The main sources of pollution in the area are vehicular traffic, industrial activities and central heating emissions. The dispersion conditions at the Athens basin have been extensively studied focusing on air pollution episodes in relation to atmospheric conditions (Asimakopoulos et al, 1992;Lalas et al, 1983;Kassomenos et al 1995;Güsten et al 1988 The quality of the spatial prediction obtained by the various methods can be partly explained from the spatial correlation between the recorded time-series, which is presented in Table 2. Correlation coefficient between the target and the remaining stations…”

Section: Application Of Spatial Interpolation Methodsmentioning

confidence: 99%