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An overview of atmospheric deposition chemistry over the Alps: present status and long-term trends

Rogora, Michela and Mosello, Rosario and Arisci, Sylvia and Brizzio, Maria Cristina and Barbieri, Alberto and Balestrini, Raflaella and Waldner, Peter and Schmitt, Marcel and Stähli, Manfred and Thimonier, Anne and Kalina, Michael and Puxbaum, Hans and Nickus, Ulrike and Ulrich, Erwin and Probst, Anne An overview of atmospheric deposition chemistry over the Alps: present status and long-term trends. (2006) Hydrobiologia, vol. 562 (n° 1). pp. 17-40. ISSN 0018-8158

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Official URL: http://dx.doi.org/10.1007/s10750-005-1803-z

Abstract

Several research programs monitoring atmospheric deposition have been launched in the Alpine countries in the last few decades. This paper uses data from previous and ongoing projects to: (i) investigate geographical variability in wet deposition chemistry over the Alps; (ii) assess temporal trends of the major chemical variables in response to changes in the atmospheric emission of pollutants; (iii) discuss the potential relationship between the status of atmospheric deposition and its effects on forest ecosystems in the alpine and subalpine area, focusing particularly on nitrogen input. We also present results of studies performed at a local level on specific topics such as long-term changes in lead deposition and the role of occult deposition in total nitrogen input. The analysis performed here highlights the marked geographical variability of atmospheric deposition in the Alpine region. Apart from some evidence of geographically limited effects, due to local sources, no obvious gradients were identified in the major ion deposition. The highest ionic loads were recorded in areas in the foothills of the Alps, such as the pre-alpine area in North-Western Italy and the area of Canton Ticino, Switzerland. Trend analysis shows a widespread decrease in the acidity of precipitation in the last 15–20 years as a consequence of the reduced emission of S compounds. On the other hand, nitrate concentrations in rain have not changed so much, and ammonium has decreased significantly only at the Austrian sampling sites. The deposition of N is still well above the estimated critical loads of nutrient N at some forest sites in the alpine and subalpine areas, thus confirming the critical situation of both terrestrial and aquatic ecosystems regarding N inputs. Existing data highlights the importance of continuously monitoring atmospheric deposition chemistry in the Alpine area, taking account of acidifying elements, nutrients and other pollutants such as heavy metals and organic compounds. There is also a need for unifying sampling and analytical methods in order to obtain comparable data from the different regions of the Alps.

Item Type:Article
Additional Information:The original publication is available at http://www.springerlink.com/content/0018-8158/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Consiglio Nazionale delle Ricerche - CNR (ITALY)
French research institutions > Institut de Recherche pour le Développement - IRD (FRANCE)
Other partners > Technische Universität Wien - TU Wien (AUSTRIA)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
French research institutions > Office National des Forêts - ONF (FRANCE)
Other partners > Swiss Federal Institute for Forest, Snow and Landscape Research - WSL (SWITZERLAND)
Other partners > University of Innsbruck (AUSTRIA)
Laboratory name:
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Deposited By: Florence Amor
Deposited On:22 Jun 2011 16:04

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