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Climate-driven Enrichment of Pollutants in Peatlands : Volume 4, Issue 3 (27/06/2007)

By Martínez Cortizas, A.

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Book Id: WPLBN0003974488
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Climate-driven Enrichment of Pollutants in Peatlands : Volume 4, Issue 3 (27/06/2007)  
Author: Martínez Cortizas, A.
Volume: Vol. 4, Issue 3
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: Dept. Edafología y Química Agrícola, Universidad de Santiago de Compostela, Campus Universitario s/n, 15782 Santiago de Compostela, Spain. Peatlands play an important role for global carbon dynamics, acting as a sink or source depending on climate. Such changes imply a series of additional effects because peatlands are also an important reservoir of atmospherically derived pollutants. Using a multiproxy approach (non-pollen-palynomorphs, Δ15N, C/N, Se, Br, I, Hg, Ti), we show a relationship between climate (wetter-drier) and peat decomposition, which affected element concentrations in a Spanish bog during the last 5500 years. Changes in superficial wetness played a critical role in the cycling of elements coupled to carbon dynamics. Dry phases caused increased peat mineralisation, resulting in a 2–3 times increase in concentrations of the analysed elements independent from atmospheric fluxes. Under the present trend of climate change large areas of northern peatlands are expected to be severely affected; in this context our findings indicate that the increase in carbon release, which leads to an enrichment of elements, may enhance the export of stored contaminants (Hg, organohalogens) to the aquatic systems or to the atmosphere.

Climate-driven enrichment of pollutants in peatlands

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