From:
http://www.ias.ac.in/jess/jun2008/jess177.pdf

On the impact of temperature on tropospheric ozone concentration levels in
urban environments

E Stathopoulou1, G Mihalakakou2, M Santamouris1 and H S Bagiorgas2,
1University of Athens, Department of Physics, Division of Applied Physics,
Laboratory of Meteorology,
University Campus, Build. Phys. V, 157 84 Athens, Greece.
2University of Ioannina, Department of Environmental and Natural Resources
Management,
2 G. Sepheri Str., 30100 Agrinio, Greece.


The influence of temperature on tropospheric ozone (O3) concentrations in
urban and photochemically
polluted areas in the greater Athens region are investigated in the present
study. Hourly
values of the ambient air temperature used for studying the urban heat
island effect in Athens
were recorded at twenty-three experimental stations while ozone
concentration values were measured
at three of the above-mentioned stations and for a period of two years
(1996–1997). The
linear correlation between ozone concentration and air temperature values as
well as the temporal
variation of temperature and ozone concentration, for the above-mentioned
experimental stations,
were calculated and analysed. Moreover, a neural network approach was used
for investigating
the impact of temperature on the ozone concentration values over the greater
Athens area. The
neural network model used ambient air temperature as one of its input
parameters and it was
found that temperature is a predominant parameter, affecting considerably
the ozone concentration
values.

..................

Both the aforementioned mechanisms are subject to temporal variability,
e.g., the 11-year sun spot cycle significantly affects the stratospheric
ozone introducing a variability of the ozone influx of approximately ±1%
(WMO 2003; Grewe 2006), in the tropical troposphere the NOx and ozone
concentration largely depends on the lightning produced NOx (Lelieveld and
Dentener 2000; Grewe 2004).

..................


4. Concluding remarks

The impact of temperature on the tropospheric ozone concentration levels in
the urban area of Athens has been investigated in the present paper. For
this reason, air temperature and ozone Impact of temperature on urban ozone
levels 235
concentration data from several experimental stations in the greater Athens
area were collected and used for performing linear correlations and temporal
variation analysis. Furthermore, the analysis was enriched with a neural
network method
for achieving a more quantitative approach of the influence of temperature
on the ozone concentration values over the greater Athens area. Ambient air
temperature and NOx concentration values were mainly used as input
parameters to the neural
network models. The results showed that temperature is a predominant
parameter, affecting considerably the ozone concentration values.

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MS received 6 December 2007; revised 19 February 2008; accepted 15 March
2008