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| Titel |
Tracing origin and fate of dissolved greenhouse gases in Malaysian peat-draining rivers |
| VerfasserIn |
Denise Müller, Thorsten Warneke, Tim Rixen, Nastassia Denis, Moritz Müller, Justus Notholt |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086799
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| Publikation (Nr.) |
 EGU/EGU2014-727.pdf |
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| Zusammenfassung |
| Tropical peatlands are known to store large amounts of organic carbon. Peat-draining rivers in
these regions receive considerable amounts of carbon from these soils, yet, its fate remains
poorly studied. Although a number of recent studies investigated greenhouse gas production
and emission from inland waters, only a small number focused on tropical freshwaters, and
data from tropical peat-draining rivers are particularly lacking. We investigated rivers in a
peat-dominated catchment in Sarawak, Malaysia. Dissolved greenhouse gases (GHG) were
measured with Fourier Transform InfraRed (FTIR) spectroscopy. It allows for the
simultaneous and continuous measurement of major GHG (CO2 and δ13C in CO2, CH4,
N2O, and CO) with high accuracy and precision. We found that concentrations of
dissolved CO, CO2 and CH4 were higher than the respective atmospheric equilibrium
concentration, suggesting that those rivers are a source of these GHG to the atmosphere.
Enhanced N2O concentrations were only found around some cultivated areas. In order
to trace the origin of the GHG, we quantified dissolved organic carbon (DOC),
particulate organic carbon (POC), inorganic nutrients and different parameters that
describe water chemistry. Stable carbon isotope analysis of dissolved inorganic carbon
(DIC) yielded indications of a terrestrial source of inorganic carbon in the river,
suggesting that in-situ respiration of organic matter might play an important role. |
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