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  • long range transport  (1)
  • seasonal cycles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Tropospheric Ozone at High Latitudes in Clean and Polluted Air Masses, a Climatological Study (1997)
    Springer
    Journal of atmospheric chemistry 28 (1997), S. 111-123 
    Details
    ISSN: 1573-0662
    Keywords: surface ozone ; seasonal cycles ; NOx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Several years of continuous measurements of surfaceozone at Norwegian monitoring sites are studied in aclimatological way. The monitoring sites are at rurallocations extending from 58°N, a few hundredkilometers from the European continent and into theArctic at 79°N. The ozone observations are sorted intoclasses of integrated NOx emissions along 96 h backtrajectories. The average seasonal cycles of ozone areestimated for each class separately. The differencesindicate the change from the background air due toanthropogenic emissions. The average seasonal cycle ofozone in the cleanest air masses showed a maximum inspring and a minimum during summer and autumn at allsites, but the spring maximum was more pronounced atthe southernmost locations. Polluted air masses showedan ozone deficit during winter and a surplus duringsummer. The deviation from the background was clearlylinked to the integrated NOx emission along thetrajectories. In summer the calculations indicate thatthe number of ozone molecules formed per NOx moleculedrops with increasing emissions. The average seasonalcycle of ozone at Birkenes for different transportsectors indicate that the most pronounced ozoneformation takes place in air masses from E-Europe/Russia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005766612853
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  • 2
    Electronic Resource
    Electronic Resource
    European VOC Emission Estimates Evaluated by Measurements and Model Calculations (1997)
    Springer
    Journal of atmospheric chemistry 28 (1997), S. 173-193 
    Details
    ISSN: 1573-0662
    Keywords: volatile hydrocarbons ; observations and computer modelling ; tropospheric concentrations ; long range transport ; emission validation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Observations and model calculations of the concentration of hydrocarbonsat five Scandinavian rural sites during March–June 1993are reported.Decreasing concentrations from March to June are observedat all sites. The highest concentrations of hydrocarbons were found in air massescoming in from the southwest to southeast, indicating that long rangetransport fromcontinental Europe and the U.K. is important in pollution episodes. An episode of elevated concentrations of hydrocarbons observed at three of the sites in the middle of Marchis described and discussed in relation to the synoptic situation and thepresenceof other chemical compounds (NO2, PAN, total nitrate andozone).A Lagrangian numerical model is used to calculate the concentrations of theindividual hydrocarbons at the fivesites and comparison with observations is made.The calculated concentrations for nonmethane hydrocarbons with quite longchemicallifetimes agree well with the observations.For the sum of observed and calculated hydrocarbons the correlationcoefficientsare in the range of 0.65–0.88 for the five sitesand the ratio between calculated and measured concentrations was0.72–0.97, indicating thatthe European VOC emission inventory is quite well estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005859027649
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    Paper (German National Licenses)
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