Variation in ozone concentration and exposure in relation to local climate in south-west Sweden

• Ozone concentration and temperature/relative humidity were monitored using passive diffusion sampling (weekly at 3 m height) and TinyTag sensors/loggers (10 minute sampling at 1 and 5 m height in self-ventilating radiation shields), respectively in the forested landscape of south-west Sweden, 50 km north-east of Göteborg,. Two forested sites were included, one situated at the top of a hill (175 m a.s.l.), and one in a nearby valley (110 m a.s.l.). In addition, a site located in an agricultural landscape was included, where ozone was measured using a UV-based monitor and measurements of temperature and relative humidity were made using a radiation shield with forced ventilation. Furthermore, a comparison with ozone concentrations at an urban and a coastal monitoring site in the region were made. It was concluded from the parallel measurements at the agricultural site that the diffusion samplers predicted the weekly ozone concentration with high accuracy. The temperature dependent systematic error of using a self-ventilating radiation shield, overestimating higher temperatures, was estimated and corrected. It was found that the elevated forested site experienced considerably higher ozone concentrations than the forest site in the valley and the agricultural site. This can be explained by stronger coupling with the boundary layer at the elevated site and more pronounced night-inversions at the valley and agricultural sites. The forested area of the interior of south-west Sweden was concluded to have lower concentrations, especially during the night, compared to the coastal site, while the comparison with the urban site revealed a more complex pattern. Climate data was used to asses the risk for plant ozone uptake.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

Nyckelord

surface ozone

passive sampling

exposure

local climate

south-west Sweden

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