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The Swedish Throughfall Monitoring network (SWETHRO) - 25 years of monitoring air pollution concentrations, deposition and soil water chemistry across Sweden in relation to European emissions of sulphur and nitrogen.

Gunilla Pihl Karlsson1, Cecilia Akselsson2, Sofie Hellsten1, Per Erik Karlsson1
1 IVL Swedish Environmental Research Institute
2 Lund University, Department of Physical Geography and Ecosystems Analysis

P 3.17 in Fluxes between the atmosphere and ecosystems

Poster Session 2 on Tuesday, 16:30-18:00

When the air pollutants sulphur dioxide and nitrogen oxides are deposited back to the ground, they contribute to acidification of soils and surface water, damaging terrestrial and aquatic ecosystems. Sweden produces relatively little air pollution itself, but is on the receiving end of long-range transport of emissions from the UK and the European continent (in addition to ship emissions from the North Sea and Baltic Sea). Efforts to reduce air pollution in Europe have resulted in a decrease of sulphur and nitrogen oxide emissions during the last decades.

Swedish Throughfall Monitoring Network (SWETHRO) data from over 50 forest monitoring sites across Sweden will be discussed to determine the geographical pattern of air pollutant concentrations, deposition of sulphur and nitrogen and soil water chemistry across Sweden during the last 25 years in relation to the emission reductions in Europe. Data from SWETHRO finds that many forest soils are still struggling to recover from the acidifying effects of the pollutants. Some areas are also at risk of nitrogen leaching from soils into surface waters.

Information about the measurements in SWETHRO.

Deposition, soil water chemistry and air pollution concentrations have been monitored within the Swedish Throughfall Monitoring Network in forest ecosystems, at some sites during almost three decades. Monitoring is on a monthly basis, except soil water chemistry which is sampled three times per year. Bulk deposition is also measured over the open field in the vicinity of some of the TF sites together with dry deposition measurements. Soil water is sampled in the mineral soil at 50 cm. Air pollution concentrations are measured with diffusive samplers at 3m above ground at some sites. At many of the plots, different forest condition parameters are monitored every 5th year, such as basal area increment, crown condition etc. Also information of tree species, stand age etc. is available. Information about soil conditions is also known for most plots. Meteorology is available from nearby official meteorology stations.

Letzte Änderung 19.06.2014