1. Site description and equipment Results and discussion
THE RESULTS OF LONG-TERM MONITORING OF SURFACE OZONE CONCENTRATION NEARBY TOMSK
B. D. Belan, D. K. Davydov, D. E. Savkin, T. K. Sklyadneva, G. N. Tolmachev, A. V. Fofonov
V.E. Zuev Institute of Atmospheric Optics, SB RAS, Tomsk, , Russian Federation +7(3822) )
Introduction
Results
Introducion
The ozone content in the troposphere is substantially influenced by human activity. Atmospheric emissions of nitrogen oxides (NOx), carbon oxides (CO and CO2), methane (CH4), and different organic compounds promote ozone formation in polluted air and increase the ozone concentration in the troposphere as a whole [1]. Since ozone is the strongest oxidant and a greenhouse gas, an increase in its content in the atmosphere has an adverse effect on living matter and climate [2].
At high concentrations it strongly inhibits vital activity of plants and negatively affects the human. In this paper we present the results of the long-term ozone monitoring carried out in the atmospheric surface layer nearby Tomsk. Data are presented on the daily, annual and long-term behavior of the surface ozone concentration (SOC). It was found that SOC in the region under study often exceeds hygienic regulations for a daily average and one-time maximum permissible concentration as well
Annual variations
The annual mean behavior presented in Fig. 4 is not always observed. For the last period of observations we can distinguish four types of annual variation for the region under study, which are presented in fig. 5.
Aim
Observational data on the surface ozone concentration (SOC) between 1990 and 2015 obtained at the, Russian Academy of Sciences, are presented. Characteristic features of the temporal variability of the surface ozone concentration are studied
Fig.4 Annual mean behaviour and monthly mean variations of SOC averaged over the whole measurement period ( ).
Site description and equipment
Data from a TOR-station (56°28'41'‘ N, 85°03'15'' E) are used for analysis. This is an automatic station located in the north-eastern outskirts of the Academic City (Akademgorodok) of Tomsk in the building of a high-altitude atmospheric sounding station at the V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Sciences (IAO SB RAS). There are no industrial objects or motorways near the station, and the effects of local gas and aerosol sources are decreased. The station is located in the zone of boreal forests and surrounded by small deciduous and coniferous forest stands.
Fig.5.Types of annual variation of SOC observed in Tomsk.
Long-term annual vaiations
Fig. 6 presents the annual average of its content in the atmospheric surface layer, which was calculated for the whole period from 1990 to 2015
Equipment
Fig.6. Long-term annual behaviour and yearly mean variations of SOC.
Performance of hygienic regulations
JSC OPTEC 3.02 P-A
Ozone analyzer
TEI model 49c
1-500 µg/m3
Measure range
Low 0-0,2 ppm
High 0-0,5 ppm
±20%
Accuracy
± 0,5% of F. S. (Full scale)
Russia
Place of Origin
USA
Chemiluminescence
Method UV
Tab.1. Repeatability of exceeding the maximum permissible concentrations of SOC
YEAR
1MPCd.a
2MPCd.a
3MPCd.a
4MPCd.a
5MPCd.a
MPCone-time
1990
17.8
0.7
1991
46.6
27.6
9.2
0.6
1992
51.6
18.7 9
3.5
2.1
1.77
1993
67.8
22.3
4.2
1994
48.6
13.7
1.1
0.3
1995
28.8
1996
45.1
11.6 2
1997
47.2
7.1
1998
0.8
1999
10.8
2000
31.42
6.56
2.19
2001
58.63
27.40
9.59
1.64
1.10
0.82
2002
50.41
13.97
2.74
0.55
2003
60.55
16.16
1.92
2004
57.92
12.84
3.28
2005
46.03
14.52
2006
36.44
17.53
2007
56.99
2008
56.28
6.01
2009
55.62
11.23
0.27
2010
55.89
5.75
2011
52.60
13.42
2012
42.62
7.10
2013
39.18
6.03
2014
63.84
19.45
2.47
2015
67.67
21.10
3.84
Results and discussion
Diurnal variations
Fig.7. Distribution of different values of SOC over the whole measurement period ( ).
Fig. 7 shows that more than half of the values have a magnitude lower than the MPC settlements.
Tab. 2 demonstrated that the region is regularly exceed hygienic regulations as for a daily average so maximum one-time limit admissible concentration.
Acknowledgements
This work was funded by Russian Foundation for Basic Research (grant № ), and Ministry of Education and Science of Russia (State Contracts № (ID:RFMTFIBBB210290), № (ID: RFMEFI61314X0013)).
Fig.2. Diurnal behaviour of SOC averaged over the whole measurement period ( ).
Fig. 3. Diurnal behaviour of SOC averaged for the middle months of each season.( )
Reference
Crutzen, P.J. and Zimmermann, P.H., The Changing Photochemistry of the Troposphere, Tellus A, B, 1991, vol. 43, pp
Scientific Assessment of Ozone Depletion: 1998, WMO Global Ozone Research and Monitoring Project Report, Geneva, 1999, no. 44.
The diurnal amplitude of SOC variation depends on the season, that can be seen from fig. 3.