Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 7 4 2003 10.5194/hess-7-436-2003 http://www.hydrol-earth-syst-sci.net/7/436/2003/ http://www.hydrol-earth-syst-sci.net/7/436/2003/hess-7-436-2003.html http://www.hydrol-earth-syst-sci.net/7/436/2003/hess-7-436-2003.pdf 436 446 0000-00-00 Long-term development of acid deposition (1880–2030) in sensitive freshwater regions in Europe W. Schöpp M. Posch S. Mylona M. Johansson International Institute for Applied Systems Analysis (IIASA), A-2361 Laxenburg, Austria Coordination Center for Effects/RIVM, NL-3720 BA Bilthoven, The Netherlands Norwegian Pollution Control Authority (SFT), N-0032 Oslo, Norway Finnish Environment Institute, FIN-00251 Helsinki, Finland E-mail for corresponding author: schoepp@iiasa.ac.at Time series of the deposition of acidifying substances are a pre-requisite for the study of the acidification and recovery of ecosystems such as surface waters. This paper reports the derivation and calculation of deposition trends of the potentially acidifying compounds SO₂, NO_x and NH₃ in sensitive freshwater regions in Europe studied in the EU-funded RECOVER: 2010 project. The time interval covered is 151 years: from 1880, which can be considered as the pre-industrial era in most countries, to 2030, taking into account the consequences of current emission reduction agreements in Europe. The historic and predicted emissions for European countries are used to calculate the deposition development in the study areas, using meteorologically averaged atmospheric source-receptor transfer coefficients derived from the EMEP Lagrangian acid deposition model. These time series were used as driving forces for the application of the dynamic acidification model MAGIC to study the acidification and recovery of sensitive freshwater ecosystems in Europe.</p> <p style="line-height: 20px;"><b>Keywords: </b> acid deposition, historic depositions, sensitive lake regions, Europe</p>