An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes
| Autor: | Maarten van Hardenbroek, Markus Leuenberger, Jos Schilder, David Bastviken, Tabea Stötter, Paula Kankaala, Päivi Johanna Rinta, Oliver Heiri |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
530 Physics Wetland 580 Plants (Botany) 010501 environmental sciences Aquatic Science 01 natural sciences Carbon cycle chemistry.chemical_compound Dissolved organic carbon Organic matter Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Water Science and Technology Hydrology chemistry.chemical_classification geography geography.geographical_feature_category Ecology δ13C Sediment chemistry 13. Climate action Environmental chemistry Carbon dioxide Environmental science Hypolimnion |
| Zdroj: | Rinta, Päivi Johanna; Bastviken, David; van Hardenbroek, Maarten; Kankaala, Paula; Leuenberger, Markus; Schilder, Jos; Stötter, Tabea; Heiri, Oliver (2015). An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes. Aquatic Sciences, 77(4), pp. 667-680. Springer 10.1007/s00027-015-0410-y |
| Popis: | Methane (CH4) and carbon dioxide emissions from lakes are relevant for assessing the greenhouse gas output of wetlands. However, only few standardized datasets describe concentrations of these gases in lakes across different geographical regions. We studied concentrations and stable carbon isotopic composition (δ13C) of CH4 and dissolved inorganic carbon (DIC) in 32 small lakes from Finland, Sweden, Germany, the Netherlands, and Switzerland in late summer. Higher concentrations and δ13C values of DIC were observed in calcareous lakes than in lakes on non-calcareous areas. In stratified lakes, δ13C values of DIC were generally lower in the hypolimnion due to the degradation of organic matter (OM). Unexpectedly, increased δ13C values of DIC were registered above the sediment in several lakes. This may reflect carbonate dissolution in calcareous lakes or methanogenesis in deepwater layers or in the sediments. Surface water CH4 concentrations were generally higher in western and central European lakes than in Fennoscandian lakes, possibly due to higher CH4 production in the littoral sediments and lateral transport, whereas CH4 concentrations in the hypolimnion did not differ significantly between the regions. The δ13C values of CH4 in the sediment suggest that δ13C values of biogenic CH4 are not necessarily linked to δ13C values of sedimentary OM but may be strongly influenced by OM quality and methanogenic pathway. Our study suggests that CH4 and DIC cycling in small lakes differ between geographical regions and that this should be taken into account when regional studies on greenhouse gas emissions are upscaled to inter-regional scales. |
| Databáze: | OpenAIRE |
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