Natural sulfur dioxide emissions from sulfuric soils |
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| Institution: | 1. College of Pharmaceutical Sciences, Innovative Drug Research Centre, Chongqing University, 55 South Daxuecheng Road, Chongqing 401331, China;2. NorthWest Centre of Advanced Drug Delivery (NoWCADD), School of Pharmacy, Centre for Tissue Injury and Repair, Institute of Inflammation and Repair, University of Manchester, Oxford Road, Manchester M13 9PT, United Kingdom;1. Center for BioProcess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads 229, DK-2800 Kgs. Lyngby, Denmark;2. Department of Forest Products, Swedish University of Agricultural Sciences, SE-75651 Uppsala, Sweden |
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| Abstract: | Soils have long been recognised as sulfur dioxide (SO2) sinks, but we show that they can also be sources of atmospheric SO2. Using static chambers and micrometeorological techniques, we have measured emissions of SO2 from coastal lowland soils containing sulfides (mostly pyrite), commonly referred to as acid sulfate soils in Australia. SO2 evolution seems coupled to evaporation of soil water containing sulfite. The global emissions of S from acid sulfate soils is estimated at about 3 Tg/year, which is of the same order as emissions from terrestrial biogenic sources and biomass burning and is about 3% of known anthropogenic emissions of S. |
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