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| Titel |
Stream-network scale patterns of CO2 evasion |
| VerfasserIn |
S. Hengsberger, G. A. Singer, E. Enrico, A. Rinaldo, T. J. Battin |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066946
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| Zusammenfassung |
| The relevance of inland waters for global carbon fluxes is becoming increasingly recognized. While data on local CO2 evasion from individual lakes and streams are now becoming available at fast pace, we still lack methods to upscale these local fluxes to the landscape and eventually to entire fluvial networks. We measured and predicted CO2 evasion in a pre-alpine fluvial network (Ybbs River, Austria) draining a 6th-order catchment (ca 400 km2). Measurements of pCO2 in more than 100 streams showed, not unexpectedly, CO2 supersaturation throughout the entire network and distinct diurnal patterns. Furthermore, using whole-stream propane injections, we assessed KCO2, the CO2 transfer coefficient, along with various hydrogeomorphological parameters in 20 streams. We found a significant negative correlation between KCO2 values and stream discharge, which was used to predict KCO2 for all study streams. In combination with a digital network model, these data serve to extrapolate reach-scale estimates of CO2 evasion to the entire fluvial network. Furthermore, we used a suite of optical parameters that describe dissolved organic carbon properties to explain the spatial variation in pCO2 in the fluvial network. |
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