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DatoValore
TitleLong-term changes in the chemistry of high altitude lakes in the Alps over 30 years
AbstractThe subalpine and alpine areas in North-Western Italy and Southern Switzerland (Ticino region) are subject to high deposition of atmospheric pollutants transported with the air masses from source region located in the lowland. Starting in the 1980s, some these lakes were recognised to be affected by acidification, due to the long-range transport of acidifying compounds, mainly sulphate and nitrate. In response to decreasing acid deposition, lakes in the Western Alps showed signs of recovery from acidification since the mid 1990s. Nevertheless pH and alkalinity remained low in several lakes, and just a few examples of biological recolonization by acid-sensitive species were found in the lakes. Climate change, especially temperature increase, has proved to be an important driver of change for high altitude lakes in the Alps. Lakes lying in catchments containing also basic, soluble rocks, showed a tendency to increasing solute concentrations, primarily as a response to reduced snow cover and more exposed soils and rocks to weathering processes.
SourceICP Waters - XXVIII Task Force meeting of the ICP Waters Programme, Verbania Pallanza, 8-10 ottobre 2012
KeywordsMountain lakesWater chemistryAtmospheric depositionAcidificationClimate change
Year2013
TypeContributo in atti di convegno
AuthorsLuca Colombo; Sandra M. Steingruber; Michela Rogora; Ombretta Tornimbeni
Text287747 2013 Mountain lakes Water chemistry Atmospheric deposition Acidification Climate change Long term changes in the chemistry of high altitude lakes in the Alps over 30 years Luca Colombo; Sandra M. Steingruber; Michela Rogora; Ombretta Tornimbeni Colombo Luca Department for Environment Constructions and Design, University of Applied Sciences and Arts of Southern Switzerland SUPSI , Canobbio Switzerland ; Steingruber, Sandra M. Office for air, climate and renewable resources, Department of the territory of Canton Ticino Switzerland ; Rogora, Michela CNR ISE, Pallanza Verbania; Tornimbeni, Ombretta CNR ISE, Pallanza Verbania The subalpine and alpine areas in North Western Italy and Southern Switzerland Ticino region are subject to high deposition of atmospheric pollutants transported with the air masses from source region located in the lowland. Starting in the 1980s, some these lakes were recognised to be affected by acidification, due to the long range transport of acidifying compounds, mainly sulphate and nitrate. In response to decreasing acid deposition, lakes in the Western Alps showed signs of recovery from acidification since the mid 1990s. Nevertheless pH and alkalinity remained low in several lakes, and just a few examples of biological recolonization by acid sensitive species were found in the lakes. Climate change, especially temperature increase, has proved to be an important driver of change for high altitude lakes in the Alps. Lakes lying in catchments containing also basic, soluble rocks, showed a tendency to increasing solute concentrations, primarily as a response to reduced snow cover and more exposed soils and rocks to weathering processes. Proceedings of the XXVIII Task Force meeting of the ICP Waters Programme 978 82 577 6207 0 Published version In ICP Waters XXVIII Task Force meeting of the ICP Waters Programme Verbania Pallanza, 8 10 ottobre 2012 . Proceedings, vol. 112 pp. 12 17. ICP Water Report . NIVA Norwegian Institute for Water Research, 2013. ICP Waters XXVIII Task Force meeting of the ICP Waters Programme Verbania Pallanza 8 10 ottobre 2012 Internazionale Contributo Proceedings Proceedings_Pallanza_112_2013_ICP_WATERS_12_17.pdf Contributo in atti di convegno michela.rogora ROGORA MICHELA TA.P02.014.002 Impatto dei cambiamenti globali sugli ecosistemi acquatici