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| Titel |
Climate-driven enrichment of pollutants in peatlands |
| VerfasserIn |
Antonio Martínez Cortizas, H. Biester, T. Mighall, R. Bindler |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 4, no. 5 ; Nr. 4, no. 5 (2007-10-25), S.905-911 |
| Datensatznummer |
250001969
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| Publikation (Nr.) |
 copernicus.org/bg-4-905-2007.pdf |
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| Zusammenfassung |
| 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. |
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