Climate change enhances the mobilisation of naturally occurring metals in high altitude environments

Zaharescu, Dragos G., Hooda, Peter S., Burghelea, Carmen I., Polyakov, Viktor and Palanca-Soler, Antonio (2016) Climate change enhances the mobilisation of naturally occurring metals in high altitude environments. Science of the Total Environment, 560-61, pp. 73-81. ISSN (print) 0048-9697

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Manmade climate change has expressed a plethora of complex effects on Earth's biogeochemical compartments. Climate change may also affect the mobilisation of natural metal sources, with potential ecological consequences beyond mountains' geographical limits; however, this question has remained largely unexplored. We investigated this by analysing a number of key climatic factors in relationship with trace metal accumulation in the sediment core of a Pyrenean lake. The sediment metal contents showed increasing accumulation trend over time, and their levels varied in step with recent climate change. The findings further revealed that a rise in the elevation of freezing level, a general increase in the frequency of drier periods, changes in the frequency of winter freezing days and a reducing snow cover since the early 1980s, together are responsible for the observed variability and augmented accumulation of trace metals. Our results provide clear evidence of increased mobilisation of natural metal sources - an overlooked effect of climate change on the environment. With further alterations in climate equilibrium predicted over the ensuing decades, it is likely that mountain catchments in metamorphic areas may become significant sources of trace metals, with potentially harmful consequences for the wider environment.

Item Type: Article
Additional Information: This work was supported by a Felix de Azara award of Huesca Provincial Council, Spain as well as University of Vigo and Kingston University
Research Area: Biological sciences
Geography and environmental studies
Faculty, School or Research Centre: Faculty of Science, Engineering and Computing (until 2017) > School of Geography, Geology and the Environment
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Depositing User: Katrina Clifford
Date Deposited: 27 Jun 2016 08:16
Last Modified: 17 Apr 2017 02:30

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