| Title | An application of the MAGIC model to four high altitude lakes in Ticino, Switzerland communities |
| Abstract | This report presents the results of a modelling exercise applied to four high altitude lakes in the Ticino region, Switzerland. In this area, acidification of high-altitude lakes situated in granitic areas was first reported in the early 1980s, as an effect of acid deposition (Mosello et al., 1992). Successively, as an effect of decreasing emission and deposition of acidifying compounds, several lakes showed signs of acidification recovery (Steingruber & Colombo, 2010a). The aim of the modelling was to reconstruct and predict lake chemistry in response to atmospheric deposition change. The applied model is MAGIC, which was specifically developed for the long term reconstruction and future prediction of soil and surface water acidification at the catchment scale (Cosby et al., 2001). The study lakes were selected on the basis of available data for the model application, and in order to be representative of the high altitude lake population in the Ticino region. They span a wide range of chemical characteristics and cover varying level of sensitivity to acidification, from highly (Starlaresc, Tomè) to moderately sensitive (Laghetto Inferiore, Laghetto Superiore) lakes. This study represents the first attempt to model long term changes in lake water chemistry, trying to evaluate the effective level of recovery (in terms of pH, ANC or other key variables) with respect to pre-acidification conditions. The model allowed a reconstruction (hindcast) of lake chemistry since 1960, and a prediction (forecast) for the period 2010-2050. The projections of future lake chemistry were obtained by applying different scenarios of atmospheric deposition reduction. |
| Source | XXIX Task Force meeting of the ICP Waters Programme, Cesky Krumlov, Repubblica Ceca, 1-3 ottobre 2013 |
| Keywords | Ticino regionAcidificationLake chemistryAtmospheric deposition |
| Year | 2014 |
| Type | Contributo in atti di convegno |
| Authors | Michela Rogora; Sandra Steingruber; Luca Colombo |
| Text | 328995 2014 Ticino region Acidification Lake chemistry Atmospheric deposition An application of the MAGIC model to four high altitude lakes in Ticino, Switzerland communities Michela Rogora; Sandra Steingruber; Luca Colombo CNR ISE, Pallanza Verbania; Ufficio aria, clima, energie rinnovabili, Cantone Ticino, CH 6500 Bellinzona; University of Applied Sciences of Southern Switzerland,SUPSI, CH 6952 Canobbio This report presents the results of a modelling exercise applied to four high altitude lakes in the Ticino region, Switzerland. In this area, acidification of high altitude lakes situated in granitic areas was first reported in the early 1980s, as an effect of acid deposition Mosello et al., 1992 . Successively, as an effect of decreasing emission and deposition of acidifying compounds, several lakes showed signs of acidification recovery Steingruber Colombo, 2010a . The aim of the modelling was to reconstruct and predict lake chemistry in response to atmospheric deposition change. The applied model is MAGIC, which was specifically developed for the long term reconstruction and future prediction of soil and surface water acidification at the catchment scale Cosby et al., 2001 . The study lakes were selected on the basis of available data for the model application, and in order to be representative of the high altitude lake population in the Ticino region. They span a wide range of chemical characteristics and cover varying level of sensitivity to acidification, from highly Starlaresc, Tome to moderately sensitive Laghetto Inferiore, Laghetto Superiore lakes. This study represents the first attempt to model long term changes in lake water chemistry, trying to evaluate the effective level of recovery in terms of pH, ANC or other key variables with respect to pre acidification conditions. The model allowed a reconstruction hindcast of lake chemistry since 1960, and a prediction forecast for the period 2010 2050. The projections of future lake chemistry were obtained by applying different scenarios of atmospheric deposition reduction. Heleen de Wit, Bente M. Wathne, Jakub Hruska 978 82 577 6378 7 Published version XXIX Task Force meeting of the ICP Waters Programme Cesky Krumlov, Repubblica Ceca 1 3 ottobre 2013 Internazionale Contributo Proceedings 2014_Proceeding_ICP_WATERS_CZR.pdf Contributo in atti di convegno s.n. . 1682 3982 ICP Waters report ICP Waters report ICP Waters rep. International Cooperative Programme on Assessment and Monitoring of Acidification of Rivers and Lakes report ICP Waters report michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici |
