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| Titel |
Aquatic carbon and GHG losses via the aquatic pathway in an arctic catchment |
| VerfasserIn |
Kerry Dinsmore, Mike Billett, Jason Lessels, Lorna Street, Philip Wookey, Robert Baxter, Jens-Arne Subke, Doerthe Tetzlaff |
| 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 |
250086620
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| Publikation (Nr.) |
 EGU/EGU2014-523.pdf |
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| Zusammenfassung |
| Based in Northwest Canada, the HYDRA project (“Permafrost catchments in transition:
hydrological controls on carbon cycling and greenhouse gas budgets”) aims to understand the
fundamental role that hydrological processes play in regulating landscape-scale carbon
fluxes. The project aims to determine a) the role of vegetation functional type in carbon
uptake, turnover and allocation, b) how the same functional types influence the delivery of
soil-derived carbon to surface waters, and c) how important the aquatic carbon and
greenhouse gas (GHG) losses are relative to catchment scale terrestrial fluxes. Here we focus
on the magnitude of the aquatic concentrations and fluxes, presenting results from the first
year of field sampling.
Concentrations of the greenhouse gases CO2, CH4 and N2O, as well as dissolved organic
and inorganic carbon (DOC and DIC), will be presented from a range of freshwater types
within the tundra landscape; sites include lakes, polygons and the ‘Siksik’ stream which
drains the primary study catchment. Eight sampling locations were selected along the
approximately 2km long Siksik stream to allow carbon and GHG concentrations to be
considered within a set of nested subcatchments. This synoptic sampling regime, in
combination with stable isotopes and major ion concentrations also measured at each
sampling point, will allow inputs of carbon and GHGs to be traced to source areas within the
catchment.
Evasion and downstream export will also be calculated and preliminary results presented
in the context of quantifying the relative importance of the aquatic pathway to the full
catchment carbon and greenhouse gas budgets. This analysis will also allow an
initial comparison between the relative importance of different water bodies within
the catchment, highlighting spatial hotspots to be prioritized in future campaigns. |
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