Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 2, Pages 873-880Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es503385d
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Funding
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB) Fellowship Program in Freshwater Science
- German Research Foundation [LO 1150/5-1]
- German Science Foundation (DFG) [KI 853/7-1 LakeShift]
- Leibniz-Association [SAW-2011-IGB-2 TemBi]
- Swiss National Science Foundation [PA00P2_142041]
- DFG project Aquameth [GR 1540/21-1]
- European Union
- Swiss National Science Foundation (SNF) [PA00P2_142041] Funding Source: Swiss National Science Foundation (SNF)
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Exchange of the greenhouse gases carbon dioxide (CO2) and methane (CH4) across inland water surfaces is an important component of the terrestrial carbon (C) balance. We investigated the fluxes of these two gases across the surface of oligotrophic Lake Stechlin using a floating chamber approach. The normalized gas transfer rate for CH4 (k(600,CH4)) was on average 2.5 times higher than that for CO2 (k(600,CO2)) and consequently higher than Fickian transport. Because of its low solubility relative to CO2, the enhanced CH4 flux is possibly explained by the presence of microbubbles in the lakes surface layer. These microbubbles may originate from atmospheric bubble entrainment or gas supersaturation (i.e., O-2) or both. Irrespective of the source, we determined that an average of 145 L m(-2) d(-1) of gas is required to exit the surface layer via microbubbles to produce the observed elevated k(600),(CH4). As k(600) values are used to estimate CH4 pathways in aquatic systems, the presence of microbubbles could alter the resulting CH4 and perhaps C balances. These microbubbles will also affect the surface fluxes of other sparingly soluble gases in inland waters, including O-2 and N-2.
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